diff --git a/compiler/testData/cli/jvm/jspecify/A.java b/compiler/testData/cli/jvm/jspecify/A.java
index efb95d977bf..9778e2315c3 100644
--- a/compiler/testData/cli/jvm/jspecify/A.java
+++ b/compiler/testData/cli/jvm/jspecify/A.java
@@ -1,7 +1,7 @@
-@org.jspecify.annotations.DefaultNonNull
+@org.jspecify.nullness.NullMarked
 public class A {
     public void foo(String x) {}
 
-    @org.jspecify.annotations.Nullable
+    @org.jspecify.nullness.Nullable
     public String bar() { return null; }
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/AnnotatedBoundsOfWildcard.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/AnnotatedBoundsOfWildcard.java
index 017794e12f5..39d2ee5399a 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/AnnotatedBoundsOfWildcard.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/AnnotatedBoundsOfWildcard.java
@@ -1,6 +1,6 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
-@DefaultNonNull
+@NullMarked
 public class AnnotatedBoundsOfWildcard {
     public void superAsIs(Test<? super @NullnessUnspecified Base, ? super @NullnessUnspecified Base, ? super @NullnessUnspecified Base> a) {}
     public void superNotNull(Test<? super Base, ? super Base, ? super Base> a) {}
@@ -16,10 +16,10 @@ public class AnnotatedBoundsOfWildcard {
 class Base {}
 class Derived extends Base {}
 
-@DefaultNonNull
+@NullMarked
 class Test<T extends Object, E extends @Nullable Object, F extends @NullnessUnspecified Object> { }
 
-@DefaultNonNull
+@NullMarked
 class Use {
     public void main(
             Test<Derived, Derived, Derived> aNotNullNotNullNotNull,
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/Defaults.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/Defaults.java
index eedbd959483..ba343a89d03 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/Defaults.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/Defaults.java
@@ -1,6 +1,6 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
-@DefaultNonNull
+@NullMarked
 public class Defaults {
     public Foo defaultField = null;
     @Nullable public Foo field = null;
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/IgnoreAnnotations.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/IgnoreAnnotations.java
index 03bd4d27611..f200469b341 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/IgnoreAnnotations.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/IgnoreAnnotations.java
@@ -1,6 +1,6 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
-@DefaultNonNull
+@NullMarked
 public class IgnoreAnnotations {
     @Nullable public Derived field = null;
 
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/NonPlatformTypeParameter.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/NonPlatformTypeParameter.java
index 03367d3592b..bb4ea838bd4 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/NonPlatformTypeParameter.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/NonPlatformTypeParameter.java
@@ -1,4 +1,4 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
 public class NonPlatformTypeParameter<T extends @Nullable Object> {
     public void foo(T t) {}
@@ -7,7 +7,7 @@ public class NonPlatformTypeParameter<T extends @Nullable Object> {
 
 class Test {}
 
-@DefaultNonNull
+@NullMarked
 class Use {
     public <T extends Test> void main(NonPlatformTypeParameter<@Nullable Object> a1, NonPlatformTypeParameter<Test> a2, T x) {
         a1.foo(null);
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/NullnessUnspecifiedTypeParameter.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/NullnessUnspecifiedTypeParameter.java
index db429c73e22..7725650cb9d 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/NullnessUnspecifiedTypeParameter.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/NullnessUnspecifiedTypeParameter.java
@@ -1,6 +1,6 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
-@DefaultNonNull
+@NullMarked
 public class NullnessUnspecifiedTypeParameter<T> {
     public void foo(T t) {}
 
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/SelfType.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/SelfType.java
index 396c887430e..f81d4340cec 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/SelfType.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/SelfType.java
@@ -1,4 +1,4 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
 @DefaultNotNull
 public class SelfType<T extends SelfType<T>> {
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/Simple.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/Simple.java
index 4b906cc1e78..57e59b8b741 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/Simple.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/Simple.java
@@ -1,6 +1,6 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
-@DefaultNonNull
+@NullMarked
 public class Simple {
     @Nullable public Derived field = null;
 
@@ -19,7 +19,7 @@ class Derived extends Base {
     void foo() {}
 }
 
-@DefaultNonNull
+@NullMarked
 class Use {
     static public void main(Simple a, Derived x) {
         a.foo(x, null).foo();
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/TypeArgumentsFromParameterBounds.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/TypeArgumentsFromParameterBounds.java
index 60112a63b35..b97a434f67f 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/TypeArgumentsFromParameterBounds.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/TypeArgumentsFromParameterBounds.java
@@ -1,13 +1,13 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
-@DefaultNonNull
+@NullMarked
 public class TypeArgumentsFromParameterBounds<T extends Object, E extends @Nullable Object, F extends @NullnessUnspecified Object> { }
 
 class A {
     public void bar(TypeArgumentsFromParameterBounds<@Nullable Test, @Nullable Test, @Nullable Test> a) {}
 }
 
-@DefaultNonNull
+@NullMarked
 class B {
     public void bar(TypeArgumentsFromParameterBounds<Test, Test, Test> a) {}
 }
@@ -18,7 +18,7 @@ class C {
 
 class Test {}
 
-@DefaultNonNull
+@NullMarked
 class Use {
     static public void main(
             TypeArgumentsFromParameterBounds<Test, Test, Test> aNotNullNotNullNotNull,
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/TypeParameterBounds.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/TypeParameterBounds.java
index 0b6f6f78e65..83981071929 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/TypeParameterBounds.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/TypeParameterBounds.java
@@ -1,12 +1,12 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
-@DefaultNonNull
+@NullMarked
 class A<T> {
     public void foo(@NullnessUnspecified T t) {}
     public <E> void bar(E e) {}
 }
 
-@DefaultNonNull
+@NullMarked
 class B<T> {
     public void foo(T t) {}
     public <E> void bar(E e) {}
@@ -14,7 +14,7 @@ class B<T> {
 
 class Test {}
 
-@DefaultNonNull
+@NullMarked
 public class TypeParameterBounds {
     <T extends Test> void main(A<@Nullable Object> a1, A<Test> a2, B<@Nullable Object> b1, B<Test> b2, T x) {
         // jspecify_nullness_mismatch
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/WildcardsWithDefault.java b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/WildcardsWithDefault.java
index 757df9469cc..e2568c2e5c5 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/WildcardsWithDefault.java
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/java/WildcardsWithDefault.java
@@ -1,6 +1,6 @@
-import org.jspecify.annotations.*;
+import org.jspecify.nullness.*;
 
-@DefaultNonNull
+@NullMarked
 public class WildcardsWithDefault {
     public void noBoundsNotNull(A<?, ?, ?> a) {}
     public void noBoundsNullable(A<@Nullable ?, @Nullable ?, @Nullable ?> a) {}
@@ -8,7 +8,7 @@ public class WildcardsWithDefault {
 
 class A <T extends Object, E extends @Nullable Object, F extends @NullnessUnspecified Object> {}
 
-@DefaultNonNull
+@NullMarked
 class Use {
     public static void main(
             A<Object, Object, Object> aNotNullNotNullNotNull,
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/AnnotatedBoundsOfWildcard.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/AnnotatedBoundsOfWildcard.txt
index 0ba07ebe427..ae2c7ff14d5 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/AnnotatedBoundsOfWildcard.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/AnnotatedBoundsOfWildcard.txt
@@ -2,17 +2,17 @@ package
 
 public fun main(/*0*/ aNotNullNotNullNotNull: Test<Derived, Derived, Derived>, /*1*/ aNotNullNotNullNull: Test<Derived, Derived, Derived?>, /*2*/ aNotNullNullNotNull: Test<Derived, Derived?, Derived>, /*3*/ aNotNullNullNull: Test<Derived, Derived?, Derived?>, /*4*/ aAnyNotNullNotNullNotNull: Test<kotlin.Any, kotlin.Any, kotlin.Any>, /*5*/ aAnyNotNullNotNullNull: Test<kotlin.Any, kotlin.Any, kotlin.Any?>, /*6*/ aAnyNotNullNullNotNull: Test<kotlin.Any, kotlin.Any?, kotlin.Any>, /*7*/ aAnyNotNullNullNull: Test<kotlin.Any, kotlin.Any?, kotlin.Any?>, /*8*/ b: AnnotatedBoundsOfWildcard): kotlin.Unit
 
-@org.jspecify.annotations.DefaultNonNull public open class AnnotatedBoundsOfWildcard {
+@org.jspecify.nullness.NullMarked public open class AnnotatedBoundsOfWildcard {
     public constructor AnnotatedBoundsOfWildcard()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open fun extendsAsIs(/*0*/ a: Test<out @org.jspecify.annotations.NullnessUnspecified Base!, out @org.jspecify.annotations.NullnessUnspecified Base!, out @org.jspecify.annotations.NullnessUnspecified Base!>!): kotlin.Unit
+    public open fun extendsAsIs(/*0*/ a: Test<out @org.jspecify.nullness.NullnessUnspecified Base!, out @org.jspecify.nullness.NullnessUnspecified Base!, out @org.jspecify.nullness.NullnessUnspecified Base!>!): kotlin.Unit
     public open fun extendsNotNull(/*0*/ a: Test<out Base!, out Base!, out Base!>!): kotlin.Unit
-    public open fun extendsNullable(/*0*/ a: Test<out @org.jspecify.annotations.Nullable Base!, out @org.jspecify.annotations.Nullable Base!, out @org.jspecify.annotations.Nullable Base!>!): kotlin.Unit
+    public open fun extendsNullable(/*0*/ a: Test<out @org.jspecify.nullness.Nullable Base!, out @org.jspecify.nullness.Nullable Base!, out @org.jspecify.nullness.Nullable Base!>!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open fun noBounds(/*0*/ a: Test<*, *, *>!): kotlin.Unit
-    public open fun superAsIs(/*0*/ a: Test<in @org.jspecify.annotations.NullnessUnspecified Base!, in @org.jspecify.annotations.NullnessUnspecified Base!, in @org.jspecify.annotations.NullnessUnspecified Base!>!): kotlin.Unit
+    public open fun superAsIs(/*0*/ a: Test<in @org.jspecify.nullness.NullnessUnspecified Base!, in @org.jspecify.nullness.NullnessUnspecified Base!, in @org.jspecify.nullness.NullnessUnspecified Base!>!): kotlin.Unit
     public open fun superNotNull(/*0*/ a: Test<in Base!, in Base!, in Base!>!): kotlin.Unit
-    public open fun superNullable(/*0*/ a: Test<in @org.jspecify.annotations.Nullable Base!, in @org.jspecify.annotations.Nullable Base!, in @org.jspecify.annotations.Nullable Base!>!): kotlin.Unit
+    public open fun superNullable(/*0*/ a: Test<in @org.jspecify.nullness.Nullable Base!, in @org.jspecify.nullness.Nullable Base!, in @org.jspecify.nullness.Nullable Base!>!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
@@ -30,17 +30,17 @@ public open class Derived : Base {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Test</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!> {
-    public constructor Test</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!>()
+@org.jspecify.nullness.NullMarked public open class Test</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!> {
+    public constructor Test</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!>()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open fun main(/*0*/ aNotNullNotNullNotNull: Test<Derived!, Derived!, Derived!>!, /*1*/ aNotNullNotNullNull: Test<Derived!, Derived!, @org.jspecify.annotations.Nullable Derived!>!, /*2*/ aNotNullNullNotNull: Test<Derived!, @org.jspecify.annotations.Nullable Derived!, Derived!>!, /*3*/ aNotNullNullNull: Test<Derived!, @org.jspecify.annotations.Nullable Derived!, @org.jspecify.annotations.Nullable Derived!>!, /*4*/ aObjectNotNullNotNullNotNull: Test<kotlin.Any!, kotlin.Any!, kotlin.Any!>!, /*5*/ aObjectNotNullNotNullNull: Test<kotlin.Any!, kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!>!, /*6*/ aObjectNotNullNullNotNull: Test<kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!, kotlin.Any!>!, /*7*/ aObjectNotNullNullNull: Test<kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!>!, /*8*/ b: AnnotatedBoundsOfWildcard!): kotlin.Unit
+    public open fun main(/*0*/ aNotNullNotNullNotNull: Test<Derived!, Derived!, Derived!>!, /*1*/ aNotNullNotNullNull: Test<Derived!, Derived!, @org.jspecify.nullness.Nullable Derived!>!, /*2*/ aNotNullNullNotNull: Test<Derived!, @org.jspecify.nullness.Nullable Derived!, Derived!>!, /*3*/ aNotNullNullNull: Test<Derived!, @org.jspecify.nullness.Nullable Derived!, @org.jspecify.nullness.Nullable Derived!>!, /*4*/ aObjectNotNullNotNullNotNull: Test<kotlin.Any!, kotlin.Any!, kotlin.Any!>!, /*5*/ aObjectNotNullNotNullNull: Test<kotlin.Any!, kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!>!, /*6*/ aObjectNotNullNullNotNull: Test<kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!, kotlin.Any!>!, /*7*/ aObjectNotNullNullNull: Test<kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!>!, /*8*/ b: AnnotatedBoundsOfWildcard!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/Defaults.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/Defaults.txt
index 475a05bc975..6e34faeb043 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/Defaults.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/Defaults.txt
@@ -2,17 +2,17 @@ package
 
 public fun main(/*0*/ a: Defaults, /*1*/ x: Foo): kotlin.Unit
 
-@org.jspecify.annotations.DefaultNonNull public open class Defaults {
+@org.jspecify.nullness.NullMarked public open class Defaults {
     public constructor Defaults()
     public final var defaultField: Foo!
-    @org.jspecify.annotations.Nullable public final var field: @org.jspecify.annotations.Nullable Foo!
+    @org.jspecify.nullness.Nullable public final var field: @org.jspecify.nullness.Nullable Foo!
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open fun everythingNotNullable(/*0*/ x: Foo!): Foo!
-    @org.jspecify.annotations.Nullable public open fun everythingNullable(/*0*/ @org.jspecify.annotations.Nullable x: @org.jspecify.annotations.Nullable Foo!): @org.jspecify.annotations.Nullable Foo!
-    @org.jspecify.annotations.NullnessUnspecified public open fun everythingUnknown(/*0*/ @org.jspecify.annotations.NullnessUnspecified x: @org.jspecify.annotations.NullnessUnspecified Foo!): @org.jspecify.annotations.NullnessUnspecified Foo!
-    public open fun explicitlyNullnessUnspecified(/*0*/ @org.jspecify.annotations.NullnessUnspecified x: @org.jspecify.annotations.NullnessUnspecified Foo!): Foo!
+    @org.jspecify.nullness.Nullable public open fun everythingNullable(/*0*/ @org.jspecify.nullness.Nullable x: @org.jspecify.nullness.Nullable Foo!): @org.jspecify.nullness.Nullable Foo!
+    @org.jspecify.nullness.NullnessUnspecified public open fun everythingUnknown(/*0*/ @org.jspecify.nullness.NullnessUnspecified x: @org.jspecify.nullness.NullnessUnspecified Foo!): @org.jspecify.nullness.NullnessUnspecified Foo!
+    public open fun explicitlyNullnessUnspecified(/*0*/ @org.jspecify.nullness.NullnessUnspecified x: @org.jspecify.nullness.NullnessUnspecified Foo!): Foo!
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    @org.jspecify.annotations.Nullable public open fun mixed(/*0*/ x: Foo!): @org.jspecify.annotations.Nullable Foo!
+    @org.jspecify.nullness.Nullable public open fun mixed(/*0*/ x: Foo!): @org.jspecify.nullness.Nullable Foo!
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/IgnoreAnnotations.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/IgnoreAnnotations.txt
index adc09d44aa4..7de3d6e3112 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/IgnoreAnnotations.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/IgnoreAnnotations.txt
@@ -18,14 +18,14 @@ public open class Derived : Base {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class IgnoreAnnotations {
+@org.jspecify.nullness.NullMarked public open class IgnoreAnnotations {
     public constructor IgnoreAnnotations()
-    @org.jspecify.annotations.Nullable public final var field: @org.jspecify.annotations.Nullable Derived!
+    @org.jspecify.nullness.Nullable public final var field: @org.jspecify.nullness.Nullable Derived!
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open fun everythingNotNullable(/*0*/ x: Derived!): Derived!
-    @org.jspecify.annotations.Nullable public open fun everythingNullable(/*0*/ @org.jspecify.annotations.Nullable x: @org.jspecify.annotations.Nullable Derived!): @org.jspecify.annotations.Nullable Derived!
-    @org.jspecify.annotations.NullnessUnspecified public open fun everythingUnknown(/*0*/ @org.jspecify.annotations.NullnessUnspecified x: @org.jspecify.annotations.NullnessUnspecified Derived!): @org.jspecify.annotations.NullnessUnspecified Derived!
-    @org.jspecify.annotations.Nullable public open fun foo(/*0*/ x: Derived!, /*1*/ @org.jspecify.annotations.NullnessUnspecified y: @org.jspecify.annotations.NullnessUnspecified Base!): @org.jspecify.annotations.Nullable Derived!
+    @org.jspecify.nullness.Nullable public open fun everythingNullable(/*0*/ @org.jspecify.nullness.Nullable x: @org.jspecify.nullness.Nullable Derived!): @org.jspecify.nullness.Nullable Derived!
+    @org.jspecify.nullness.NullnessUnspecified public open fun everythingUnknown(/*0*/ @org.jspecify.nullness.NullnessUnspecified x: @org.jspecify.nullness.NullnessUnspecified Derived!): @org.jspecify.nullness.NullnessUnspecified Derived!
+    @org.jspecify.nullness.Nullable public open fun foo(/*0*/ x: Derived!, /*1*/ @org.jspecify.nullness.NullnessUnspecified y: @org.jspecify.nullness.NullnessUnspecified Base!): @org.jspecify.nullness.Nullable Derived!
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/NonPlatformTypeParameter.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/NonPlatformTypeParameter.txt
index af5b22a05e4..8a40c5fd435 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/NonPlatformTypeParameter.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/NonPlatformTypeParameter.txt
@@ -2,9 +2,9 @@ package
 
 public fun </*0*/ T : Test> main(/*0*/ a1: NonPlatformTypeParameter<kotlin.Any?>, /*1*/ a2: NonPlatformTypeParameter<Test>, /*2*/ x: T): kotlin.Unit
 
-public open class NonPlatformTypeParameter</*0*/ T : @org.jspecify.annotations.Nullable kotlin.Any!> {
-    public constructor NonPlatformTypeParameter</*0*/ T : @org.jspecify.annotations.Nullable kotlin.Any!>()
-    public open fun </*0*/ E : @org.jspecify.annotations.Nullable kotlin.Any!> bar(/*0*/ e: E!): kotlin.Unit
+public open class NonPlatformTypeParameter</*0*/ T : @org.jspecify.nullness.Nullable kotlin.Any!> {
+    public constructor NonPlatformTypeParameter</*0*/ T : @org.jspecify.nullness.Nullable kotlin.Any!>()
+    public open fun </*0*/ E : @org.jspecify.nullness.Nullable kotlin.Any!> bar(/*0*/ e: E!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open fun foo(/*0*/ t: T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
@@ -18,10 +18,10 @@ public open class Test {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open fun </*0*/ T : Test!> main(/*0*/ a1: NonPlatformTypeParameter<@org.jspecify.annotations.Nullable kotlin.Any!>!, /*1*/ a2: NonPlatformTypeParameter<Test!>!, /*2*/ x: T!): kotlin.Unit
+    public open fun </*0*/ T : Test!> main(/*0*/ a1: NonPlatformTypeParameter<@org.jspecify.nullness.Nullable kotlin.Any!>!, /*1*/ a2: NonPlatformTypeParameter<Test!>!, /*2*/ x: T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/NullnessUnspecifiedTypeParameter.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/NullnessUnspecifiedTypeParameter.txt
index a305456702b..0aa27f558d0 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/NullnessUnspecifiedTypeParameter.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/NullnessUnspecifiedTypeParameter.txt
@@ -2,7 +2,7 @@ package
 
 public fun main(/*0*/ a1: NullnessUnspecifiedTypeParameter<kotlin.Any>, /*1*/ a2: NullnessUnspecifiedTypeParameter<kotlin.Any?>, /*2*/ x: Test): kotlin.Unit
 
-@org.jspecify.annotations.DefaultNonNull public open class NullnessUnspecifiedTypeParameter</*0*/ T : kotlin.Any!> {
+@org.jspecify.nullness.NullMarked public open class NullnessUnspecifiedTypeParameter</*0*/ T : kotlin.Any!> {
     public constructor NullnessUnspecifiedTypeParameter</*0*/ T : kotlin.Any!>()
     public open fun bar(/*0*/ s: Test!, /*1*/ t: T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -22,6 +22,6 @@ public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public/*package*/ open fun main(/*0*/ a1: NullnessUnspecifiedTypeParameter<kotlin.Any!>!, /*1*/ a2: NullnessUnspecifiedTypeParameter<@org.jspecify.annotations.Nullable kotlin.Any!>!, /*2*/ x: Test!): kotlin.Unit
+    public/*package*/ open fun main(/*0*/ a1: NullnessUnspecifiedTypeParameter<kotlin.Any!>!, /*1*/ a2: NullnessUnspecifiedTypeParameter<@org.jspecify.nullness.Nullable kotlin.Any!>!, /*2*/ x: Test!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/SelfType.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/SelfType.txt
index 95df12f1732..c7e26add7f5 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/SelfType.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/SelfType.txt
@@ -10,10 +10,10 @@ public open class AK : SelfType<AK!> {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public open class AKN : SelfType<@org.jspecify.annotations.Nullable AK!> {
+public open class AKN : SelfType<@org.jspecify.nullness.Nullable AK!> {
     public constructor AKN()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: @org.jspecify.annotations.Nullable AK!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: @org.jspecify.nullness.Nullable AK!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
@@ -50,10 +50,10 @@ public open class CK : C<CK!> {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public open class CKN : C<@org.jspecify.annotations.Nullable CK!> {
+public open class CKN : C<@org.jspecify.nullness.Nullable CK!> {
     public constructor CKN()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: @org.jspecify.annotations.Nullable CK!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: @org.jspecify.nullness.Nullable CK!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open fun main(/*0*/ ak: AK!, /*1*/ akn: AKN!, /*2*/ bk: BK!, /*3*/ ck: CK!, /*4*/ ckn: CKN!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/Simple.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/Simple.txt
index 8a0a6c126b7..22a0b1f519f 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/Simple.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/Simple.txt
@@ -17,17 +17,17 @@ public open class Derived : Base {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Simple {
+@org.jspecify.nullness.NullMarked public open class Simple {
     public constructor Simple()
-    @org.jspecify.annotations.Nullable public final var field: @org.jspecify.annotations.Nullable Derived!
+    @org.jspecify.nullness.Nullable public final var field: @org.jspecify.nullness.Nullable Derived!
     public open fun bar(): Derived!
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    @org.jspecify.annotations.Nullable public open fun foo(/*0*/ x: Derived!, /*1*/ @org.jspecify.annotations.NullnessUnspecified y: @org.jspecify.annotations.NullnessUnspecified Base!): @org.jspecify.annotations.Nullable Derived!
+    @org.jspecify.nullness.Nullable public open fun foo(/*0*/ x: Derived!, /*1*/ @org.jspecify.nullness.NullnessUnspecified y: @org.jspecify.nullness.NullnessUnspecified Base!): @org.jspecify.nullness.Nullable Derived!
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/TypeArgumentsFromParameterBounds.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/TypeArgumentsFromParameterBounds.txt
index 7b6bc297f09..914a7c0671b 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/TypeArgumentsFromParameterBounds.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/TypeArgumentsFromParameterBounds.txt
@@ -4,13 +4,13 @@ public fun main(/*0*/ aNotNullNotNullNotNull: TypeArgumentsFromParameterBounds<T
 
 public open class A {
     public constructor A()
-    public open fun bar(/*0*/ a: TypeArgumentsFromParameterBounds<@org.jspecify.annotations.Nullable Test!, @org.jspecify.annotations.Nullable Test!, @org.jspecify.annotations.Nullable Test!>!): kotlin.Unit
+    public open fun bar(/*0*/ a: TypeArgumentsFromParameterBounds<@org.jspecify.nullness.Nullable Test!, @org.jspecify.nullness.Nullable Test!, @org.jspecify.nullness.Nullable Test!>!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class B {
+@org.jspecify.nullness.NullMarked public open class B {
     public constructor B()
     public open fun bar(/*0*/ a: TypeArgumentsFromParameterBounds<Test!, Test!, Test!>!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -33,19 +33,19 @@ public open class Test {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class TypeArgumentsFromParameterBounds</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!> {
-    public constructor TypeArgumentsFromParameterBounds</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!>()
+@org.jspecify.nullness.NullMarked public open class TypeArgumentsFromParameterBounds</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!> {
+    public constructor TypeArgumentsFromParameterBounds</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!>()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 
     // Static members
-    public open fun main(/*0*/ aNotNullNotNullNotNull: TypeArgumentsFromParameterBounds<Test!, Test!, Test!>!, /*1*/ aNotNullNotNullNull: TypeArgumentsFromParameterBounds<Test!, Test!, @org.jspecify.annotations.Nullable Test!>!, /*2*/ aNotNullNullNotNull: TypeArgumentsFromParameterBounds<Test!, @org.jspecify.annotations.Nullable Test!, Test!>!, /*3*/ aNotNullNullNull: TypeArgumentsFromParameterBounds<Test!, @org.jspecify.annotations.Nullable Test!, @org.jspecify.annotations.Nullable Test!>!, /*4*/ a: A!, /*5*/ b: B!, /*6*/ c: C!): kotlin.Unit
+    public open fun main(/*0*/ aNotNullNotNullNotNull: TypeArgumentsFromParameterBounds<Test!, Test!, Test!>!, /*1*/ aNotNullNotNullNull: TypeArgumentsFromParameterBounds<Test!, Test!, @org.jspecify.nullness.Nullable Test!>!, /*2*/ aNotNullNullNotNull: TypeArgumentsFromParameterBounds<Test!, @org.jspecify.nullness.Nullable Test!, Test!>!, /*3*/ aNotNullNullNull: TypeArgumentsFromParameterBounds<Test!, @org.jspecify.nullness.Nullable Test!, @org.jspecify.nullness.Nullable Test!>!, /*4*/ a: A!, /*5*/ b: B!, /*6*/ c: C!): kotlin.Unit
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/TypeParameterBounds.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/TypeParameterBounds.txt
index ef9f5dbda66..619d8944a67 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/TypeParameterBounds.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/TypeParameterBounds.txt
@@ -2,16 +2,16 @@ package
 
 public fun </*0*/ T : Test> main(/*0*/ a1: A<kotlin.Any?>, /*1*/ a2: A<Test>, /*2*/ b1: B<kotlin.Any?>, /*3*/ b2: B<Test>, /*4*/ x: T): kotlin.Unit
 
-@org.jspecify.annotations.DefaultNonNull public open class A</*0*/ T : kotlin.Any!> {
+@org.jspecify.nullness.NullMarked public open class A</*0*/ T : kotlin.Any!> {
     public constructor A</*0*/ T : kotlin.Any!>()
     public open fun </*0*/ E : kotlin.Any!> bar(/*0*/ e: E!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open fun foo(/*0*/ @org.jspecify.annotations.NullnessUnspecified t: @org.jspecify.annotations.NullnessUnspecified T!): kotlin.Unit
+    public open fun foo(/*0*/ @org.jspecify.nullness.NullnessUnspecified t: @org.jspecify.nullness.NullnessUnspecified T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class B</*0*/ T : kotlin.Any!> {
+@org.jspecify.nullness.NullMarked public open class B</*0*/ T : kotlin.Any!> {
     public constructor B</*0*/ T : kotlin.Any!>()
     public open fun </*0*/ E : kotlin.Any!> bar(/*0*/ e: E!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -27,10 +27,10 @@ public open class Test {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class TypeParameterBounds {
+@org.jspecify.nullness.NullMarked public open class TypeParameterBounds {
     public constructor TypeParameterBounds()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public/*package*/ open fun </*0*/ T : Test!> main(/*0*/ a1: A<@org.jspecify.annotations.Nullable kotlin.Any!>!, /*1*/ a2: A<Test!>!, /*2*/ b1: B<@org.jspecify.annotations.Nullable kotlin.Any!>!, /*3*/ b2: B<Test!>!, /*4*/ x: T!): kotlin.Unit
+    public/*package*/ open fun </*0*/ T : Test!> main(/*0*/ a1: A<@org.jspecify.nullness.Nullable kotlin.Any!>!, /*1*/ a2: A<Test!>!, /*2*/ b1: B<@org.jspecify.nullness.Nullable kotlin.Any!>!, /*3*/ b2: B<Test!>!, /*4*/ x: T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/WildcardsWithDefault.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/WildcardsWithDefault.txt
index 75b527e8dc6..7b1bc5bb428 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/WildcardsWithDefault.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/strictMode/WildcardsWithDefault.txt
@@ -2,24 +2,24 @@ package
 
 public fun main(/*0*/ aNotNullNotNullNotNull: A<kotlin.Any, kotlin.Any, kotlin.Any>, /*1*/ aNotNullNotNullNull: A<kotlin.Any, kotlin.Any, kotlin.Any?>, /*2*/ aNotNullNullNotNull: A<kotlin.Any, kotlin.Any?, kotlin.Any>, /*3*/ aNotNullNullNull: A<kotlin.Any, kotlin.Any?, kotlin.Any?>, /*4*/ b: WildcardsWithDefault): kotlin.Unit
 
-public open class A</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!> {
-    public constructor A</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!>()
+public open class A</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!> {
+    public constructor A</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!>()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 
     // Static members
-    public open fun main(/*0*/ aNotNullNotNullNotNull: A<kotlin.Any!, kotlin.Any!, kotlin.Any!>!, /*1*/ aNotNullNotNullNull: A<kotlin.Any!, kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!>!, /*2*/ aNotNullNullNotNull: A<kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!, kotlin.Any!>!, /*3*/ aNotNullNullNull: A<kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!>!, /*4*/ b: WildcardsWithDefault!): kotlin.Unit
+    public open fun main(/*0*/ aNotNullNotNullNotNull: A<kotlin.Any!, kotlin.Any!, kotlin.Any!>!, /*1*/ aNotNullNotNullNull: A<kotlin.Any!, kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!>!, /*2*/ aNotNullNullNotNull: A<kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!, kotlin.Any!>!, /*3*/ aNotNullNullNull: A<kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!>!, /*4*/ b: WildcardsWithDefault!): kotlin.Unit
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class WildcardsWithDefault {
+@org.jspecify.nullness.NullMarked public open class WildcardsWithDefault {
     public constructor WildcardsWithDefault()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/AnnotatedBoundsOfWildcard.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/AnnotatedBoundsOfWildcard.txt
index 0ba07ebe427..ae2c7ff14d5 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/AnnotatedBoundsOfWildcard.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/AnnotatedBoundsOfWildcard.txt
@@ -2,17 +2,17 @@ package
 
 public fun main(/*0*/ aNotNullNotNullNotNull: Test<Derived, Derived, Derived>, /*1*/ aNotNullNotNullNull: Test<Derived, Derived, Derived?>, /*2*/ aNotNullNullNotNull: Test<Derived, Derived?, Derived>, /*3*/ aNotNullNullNull: Test<Derived, Derived?, Derived?>, /*4*/ aAnyNotNullNotNullNotNull: Test<kotlin.Any, kotlin.Any, kotlin.Any>, /*5*/ aAnyNotNullNotNullNull: Test<kotlin.Any, kotlin.Any, kotlin.Any?>, /*6*/ aAnyNotNullNullNotNull: Test<kotlin.Any, kotlin.Any?, kotlin.Any>, /*7*/ aAnyNotNullNullNull: Test<kotlin.Any, kotlin.Any?, kotlin.Any?>, /*8*/ b: AnnotatedBoundsOfWildcard): kotlin.Unit
 
-@org.jspecify.annotations.DefaultNonNull public open class AnnotatedBoundsOfWildcard {
+@org.jspecify.nullness.NullMarked public open class AnnotatedBoundsOfWildcard {
     public constructor AnnotatedBoundsOfWildcard()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open fun extendsAsIs(/*0*/ a: Test<out @org.jspecify.annotations.NullnessUnspecified Base!, out @org.jspecify.annotations.NullnessUnspecified Base!, out @org.jspecify.annotations.NullnessUnspecified Base!>!): kotlin.Unit
+    public open fun extendsAsIs(/*0*/ a: Test<out @org.jspecify.nullness.NullnessUnspecified Base!, out @org.jspecify.nullness.NullnessUnspecified Base!, out @org.jspecify.nullness.NullnessUnspecified Base!>!): kotlin.Unit
     public open fun extendsNotNull(/*0*/ a: Test<out Base!, out Base!, out Base!>!): kotlin.Unit
-    public open fun extendsNullable(/*0*/ a: Test<out @org.jspecify.annotations.Nullable Base!, out @org.jspecify.annotations.Nullable Base!, out @org.jspecify.annotations.Nullable Base!>!): kotlin.Unit
+    public open fun extendsNullable(/*0*/ a: Test<out @org.jspecify.nullness.Nullable Base!, out @org.jspecify.nullness.Nullable Base!, out @org.jspecify.nullness.Nullable Base!>!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open fun noBounds(/*0*/ a: Test<*, *, *>!): kotlin.Unit
-    public open fun superAsIs(/*0*/ a: Test<in @org.jspecify.annotations.NullnessUnspecified Base!, in @org.jspecify.annotations.NullnessUnspecified Base!, in @org.jspecify.annotations.NullnessUnspecified Base!>!): kotlin.Unit
+    public open fun superAsIs(/*0*/ a: Test<in @org.jspecify.nullness.NullnessUnspecified Base!, in @org.jspecify.nullness.NullnessUnspecified Base!, in @org.jspecify.nullness.NullnessUnspecified Base!>!): kotlin.Unit
     public open fun superNotNull(/*0*/ a: Test<in Base!, in Base!, in Base!>!): kotlin.Unit
-    public open fun superNullable(/*0*/ a: Test<in @org.jspecify.annotations.Nullable Base!, in @org.jspecify.annotations.Nullable Base!, in @org.jspecify.annotations.Nullable Base!>!): kotlin.Unit
+    public open fun superNullable(/*0*/ a: Test<in @org.jspecify.nullness.Nullable Base!, in @org.jspecify.nullness.Nullable Base!, in @org.jspecify.nullness.Nullable Base!>!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
@@ -30,17 +30,17 @@ public open class Derived : Base {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Test</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!> {
-    public constructor Test</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!>()
+@org.jspecify.nullness.NullMarked public open class Test</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!> {
+    public constructor Test</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!>()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open fun main(/*0*/ aNotNullNotNullNotNull: Test<Derived!, Derived!, Derived!>!, /*1*/ aNotNullNotNullNull: Test<Derived!, Derived!, @org.jspecify.annotations.Nullable Derived!>!, /*2*/ aNotNullNullNotNull: Test<Derived!, @org.jspecify.annotations.Nullable Derived!, Derived!>!, /*3*/ aNotNullNullNull: Test<Derived!, @org.jspecify.annotations.Nullable Derived!, @org.jspecify.annotations.Nullable Derived!>!, /*4*/ aObjectNotNullNotNullNotNull: Test<kotlin.Any!, kotlin.Any!, kotlin.Any!>!, /*5*/ aObjectNotNullNotNullNull: Test<kotlin.Any!, kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!>!, /*6*/ aObjectNotNullNullNotNull: Test<kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!, kotlin.Any!>!, /*7*/ aObjectNotNullNullNull: Test<kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!>!, /*8*/ b: AnnotatedBoundsOfWildcard!): kotlin.Unit
+    public open fun main(/*0*/ aNotNullNotNullNotNull: Test<Derived!, Derived!, Derived!>!, /*1*/ aNotNullNotNullNull: Test<Derived!, Derived!, @org.jspecify.nullness.Nullable Derived!>!, /*2*/ aNotNullNullNotNull: Test<Derived!, @org.jspecify.nullness.Nullable Derived!, Derived!>!, /*3*/ aNotNullNullNull: Test<Derived!, @org.jspecify.nullness.Nullable Derived!, @org.jspecify.nullness.Nullable Derived!>!, /*4*/ aObjectNotNullNotNullNotNull: Test<kotlin.Any!, kotlin.Any!, kotlin.Any!>!, /*5*/ aObjectNotNullNotNullNull: Test<kotlin.Any!, kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!>!, /*6*/ aObjectNotNullNullNotNull: Test<kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!, kotlin.Any!>!, /*7*/ aObjectNotNullNullNull: Test<kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!>!, /*8*/ b: AnnotatedBoundsOfWildcard!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/Defaults.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/Defaults.txt
index 475a05bc975..6e34faeb043 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/Defaults.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/Defaults.txt
@@ -2,17 +2,17 @@ package
 
 public fun main(/*0*/ a: Defaults, /*1*/ x: Foo): kotlin.Unit
 
-@org.jspecify.annotations.DefaultNonNull public open class Defaults {
+@org.jspecify.nullness.NullMarked public open class Defaults {
     public constructor Defaults()
     public final var defaultField: Foo!
-    @org.jspecify.annotations.Nullable public final var field: @org.jspecify.annotations.Nullable Foo!
+    @org.jspecify.nullness.Nullable public final var field: @org.jspecify.nullness.Nullable Foo!
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open fun everythingNotNullable(/*0*/ x: Foo!): Foo!
-    @org.jspecify.annotations.Nullable public open fun everythingNullable(/*0*/ @org.jspecify.annotations.Nullable x: @org.jspecify.annotations.Nullable Foo!): @org.jspecify.annotations.Nullable Foo!
-    @org.jspecify.annotations.NullnessUnspecified public open fun everythingUnknown(/*0*/ @org.jspecify.annotations.NullnessUnspecified x: @org.jspecify.annotations.NullnessUnspecified Foo!): @org.jspecify.annotations.NullnessUnspecified Foo!
-    public open fun explicitlyNullnessUnspecified(/*0*/ @org.jspecify.annotations.NullnessUnspecified x: @org.jspecify.annotations.NullnessUnspecified Foo!): Foo!
+    @org.jspecify.nullness.Nullable public open fun everythingNullable(/*0*/ @org.jspecify.nullness.Nullable x: @org.jspecify.nullness.Nullable Foo!): @org.jspecify.nullness.Nullable Foo!
+    @org.jspecify.nullness.NullnessUnspecified public open fun everythingUnknown(/*0*/ @org.jspecify.nullness.NullnessUnspecified x: @org.jspecify.nullness.NullnessUnspecified Foo!): @org.jspecify.nullness.NullnessUnspecified Foo!
+    public open fun explicitlyNullnessUnspecified(/*0*/ @org.jspecify.nullness.NullnessUnspecified x: @org.jspecify.nullness.NullnessUnspecified Foo!): Foo!
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    @org.jspecify.annotations.Nullable public open fun mixed(/*0*/ x: Foo!): @org.jspecify.annotations.Nullable Foo!
+    @org.jspecify.nullness.Nullable public open fun mixed(/*0*/ x: Foo!): @org.jspecify.nullness.Nullable Foo!
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/IgnoreAnnotations.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/IgnoreAnnotations.txt
index adc09d44aa4..7de3d6e3112 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/IgnoreAnnotations.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/IgnoreAnnotations.txt
@@ -18,14 +18,14 @@ public open class Derived : Base {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class IgnoreAnnotations {
+@org.jspecify.nullness.NullMarked public open class IgnoreAnnotations {
     public constructor IgnoreAnnotations()
-    @org.jspecify.annotations.Nullable public final var field: @org.jspecify.annotations.Nullable Derived!
+    @org.jspecify.nullness.Nullable public final var field: @org.jspecify.nullness.Nullable Derived!
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open fun everythingNotNullable(/*0*/ x: Derived!): Derived!
-    @org.jspecify.annotations.Nullable public open fun everythingNullable(/*0*/ @org.jspecify.annotations.Nullable x: @org.jspecify.annotations.Nullable Derived!): @org.jspecify.annotations.Nullable Derived!
-    @org.jspecify.annotations.NullnessUnspecified public open fun everythingUnknown(/*0*/ @org.jspecify.annotations.NullnessUnspecified x: @org.jspecify.annotations.NullnessUnspecified Derived!): @org.jspecify.annotations.NullnessUnspecified Derived!
-    @org.jspecify.annotations.Nullable public open fun foo(/*0*/ x: Derived!, /*1*/ @org.jspecify.annotations.NullnessUnspecified y: @org.jspecify.annotations.NullnessUnspecified Base!): @org.jspecify.annotations.Nullable Derived!
+    @org.jspecify.nullness.Nullable public open fun everythingNullable(/*0*/ @org.jspecify.nullness.Nullable x: @org.jspecify.nullness.Nullable Derived!): @org.jspecify.nullness.Nullable Derived!
+    @org.jspecify.nullness.NullnessUnspecified public open fun everythingUnknown(/*0*/ @org.jspecify.nullness.NullnessUnspecified x: @org.jspecify.nullness.NullnessUnspecified Derived!): @org.jspecify.nullness.NullnessUnspecified Derived!
+    @org.jspecify.nullness.Nullable public open fun foo(/*0*/ x: Derived!, /*1*/ @org.jspecify.nullness.NullnessUnspecified y: @org.jspecify.nullness.NullnessUnspecified Base!): @org.jspecify.nullness.Nullable Derived!
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/NonPlatformTypeParameter.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/NonPlatformTypeParameter.txt
index af5b22a05e4..8a40c5fd435 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/NonPlatformTypeParameter.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/NonPlatformTypeParameter.txt
@@ -2,9 +2,9 @@ package
 
 public fun </*0*/ T : Test> main(/*0*/ a1: NonPlatformTypeParameter<kotlin.Any?>, /*1*/ a2: NonPlatformTypeParameter<Test>, /*2*/ x: T): kotlin.Unit
 
-public open class NonPlatformTypeParameter</*0*/ T : @org.jspecify.annotations.Nullable kotlin.Any!> {
-    public constructor NonPlatformTypeParameter</*0*/ T : @org.jspecify.annotations.Nullable kotlin.Any!>()
-    public open fun </*0*/ E : @org.jspecify.annotations.Nullable kotlin.Any!> bar(/*0*/ e: E!): kotlin.Unit
+public open class NonPlatformTypeParameter</*0*/ T : @org.jspecify.nullness.Nullable kotlin.Any!> {
+    public constructor NonPlatformTypeParameter</*0*/ T : @org.jspecify.nullness.Nullable kotlin.Any!>()
+    public open fun </*0*/ E : @org.jspecify.nullness.Nullable kotlin.Any!> bar(/*0*/ e: E!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open fun foo(/*0*/ t: T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
@@ -18,10 +18,10 @@ public open class Test {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open fun </*0*/ T : Test!> main(/*0*/ a1: NonPlatformTypeParameter<@org.jspecify.annotations.Nullable kotlin.Any!>!, /*1*/ a2: NonPlatformTypeParameter<Test!>!, /*2*/ x: T!): kotlin.Unit
+    public open fun </*0*/ T : Test!> main(/*0*/ a1: NonPlatformTypeParameter<@org.jspecify.nullness.Nullable kotlin.Any!>!, /*1*/ a2: NonPlatformTypeParameter<Test!>!, /*2*/ x: T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/NullnessUnspecifiedTypeParameter.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/NullnessUnspecifiedTypeParameter.txt
index a305456702b..0aa27f558d0 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/NullnessUnspecifiedTypeParameter.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/NullnessUnspecifiedTypeParameter.txt
@@ -2,7 +2,7 @@ package
 
 public fun main(/*0*/ a1: NullnessUnspecifiedTypeParameter<kotlin.Any>, /*1*/ a2: NullnessUnspecifiedTypeParameter<kotlin.Any?>, /*2*/ x: Test): kotlin.Unit
 
-@org.jspecify.annotations.DefaultNonNull public open class NullnessUnspecifiedTypeParameter</*0*/ T : kotlin.Any!> {
+@org.jspecify.nullness.NullMarked public open class NullnessUnspecifiedTypeParameter</*0*/ T : kotlin.Any!> {
     public constructor NullnessUnspecifiedTypeParameter</*0*/ T : kotlin.Any!>()
     public open fun bar(/*0*/ s: Test!, /*1*/ t: T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -22,6 +22,6 @@ public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public/*package*/ open fun main(/*0*/ a1: NullnessUnspecifiedTypeParameter<kotlin.Any!>!, /*1*/ a2: NullnessUnspecifiedTypeParameter<@org.jspecify.annotations.Nullable kotlin.Any!>!, /*2*/ x: Test!): kotlin.Unit
+    public/*package*/ open fun main(/*0*/ a1: NullnessUnspecifiedTypeParameter<kotlin.Any!>!, /*1*/ a2: NullnessUnspecifiedTypeParameter<@org.jspecify.nullness.Nullable kotlin.Any!>!, /*2*/ x: Test!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/SelfType.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/SelfType.txt
index 95df12f1732..c7e26add7f5 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/SelfType.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/SelfType.txt
@@ -10,10 +10,10 @@ public open class AK : SelfType<AK!> {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public open class AKN : SelfType<@org.jspecify.annotations.Nullable AK!> {
+public open class AKN : SelfType<@org.jspecify.nullness.Nullable AK!> {
     public constructor AKN()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: @org.jspecify.annotations.Nullable AK!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: @org.jspecify.nullness.Nullable AK!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
@@ -50,10 +50,10 @@ public open class CK : C<CK!> {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public open class CKN : C<@org.jspecify.annotations.Nullable CK!> {
+public open class CKN : C<@org.jspecify.nullness.Nullable CK!> {
     public constructor CKN()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: @org.jspecify.annotations.Nullable CK!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun foo(/*0*/ t: @org.jspecify.nullness.Nullable CK!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open fun main(/*0*/ ak: AK!, /*1*/ akn: AKN!, /*2*/ bk: BK!, /*3*/ ck: CK!, /*4*/ ckn: CKN!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/Simple.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/Simple.txt
index 8a0a6c126b7..22a0b1f519f 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/Simple.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/Simple.txt
@@ -17,17 +17,17 @@ public open class Derived : Base {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Simple {
+@org.jspecify.nullness.NullMarked public open class Simple {
     public constructor Simple()
-    @org.jspecify.annotations.Nullable public final var field: @org.jspecify.annotations.Nullable Derived!
+    @org.jspecify.nullness.Nullable public final var field: @org.jspecify.nullness.Nullable Derived!
     public open fun bar(): Derived!
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    @org.jspecify.annotations.Nullable public open fun foo(/*0*/ x: Derived!, /*1*/ @org.jspecify.annotations.NullnessUnspecified y: @org.jspecify.annotations.NullnessUnspecified Base!): @org.jspecify.annotations.Nullable Derived!
+    @org.jspecify.nullness.Nullable public open fun foo(/*0*/ x: Derived!, /*1*/ @org.jspecify.nullness.NullnessUnspecified y: @org.jspecify.nullness.NullnessUnspecified Base!): @org.jspecify.nullness.Nullable Derived!
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/TypeArgumentsFromParameterBounds.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/TypeArgumentsFromParameterBounds.txt
index 7b6bc297f09..914a7c0671b 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/TypeArgumentsFromParameterBounds.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/TypeArgumentsFromParameterBounds.txt
@@ -4,13 +4,13 @@ public fun main(/*0*/ aNotNullNotNullNotNull: TypeArgumentsFromParameterBounds<T
 
 public open class A {
     public constructor A()
-    public open fun bar(/*0*/ a: TypeArgumentsFromParameterBounds<@org.jspecify.annotations.Nullable Test!, @org.jspecify.annotations.Nullable Test!, @org.jspecify.annotations.Nullable Test!>!): kotlin.Unit
+    public open fun bar(/*0*/ a: TypeArgumentsFromParameterBounds<@org.jspecify.nullness.Nullable Test!, @org.jspecify.nullness.Nullable Test!, @org.jspecify.nullness.Nullable Test!>!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class B {
+@org.jspecify.nullness.NullMarked public open class B {
     public constructor B()
     public open fun bar(/*0*/ a: TypeArgumentsFromParameterBounds<Test!, Test!, Test!>!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -33,19 +33,19 @@ public open class Test {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class TypeArgumentsFromParameterBounds</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!> {
-    public constructor TypeArgumentsFromParameterBounds</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!>()
+@org.jspecify.nullness.NullMarked public open class TypeArgumentsFromParameterBounds</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!> {
+    public constructor TypeArgumentsFromParameterBounds</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!>()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 
     // Static members
-    public open fun main(/*0*/ aNotNullNotNullNotNull: TypeArgumentsFromParameterBounds<Test!, Test!, Test!>!, /*1*/ aNotNullNotNullNull: TypeArgumentsFromParameterBounds<Test!, Test!, @org.jspecify.annotations.Nullable Test!>!, /*2*/ aNotNullNullNotNull: TypeArgumentsFromParameterBounds<Test!, @org.jspecify.annotations.Nullable Test!, Test!>!, /*3*/ aNotNullNullNull: TypeArgumentsFromParameterBounds<Test!, @org.jspecify.annotations.Nullable Test!, @org.jspecify.annotations.Nullable Test!>!, /*4*/ a: A!, /*5*/ b: B!, /*6*/ c: C!): kotlin.Unit
+    public open fun main(/*0*/ aNotNullNotNullNotNull: TypeArgumentsFromParameterBounds<Test!, Test!, Test!>!, /*1*/ aNotNullNotNullNull: TypeArgumentsFromParameterBounds<Test!, Test!, @org.jspecify.nullness.Nullable Test!>!, /*2*/ aNotNullNullNotNull: TypeArgumentsFromParameterBounds<Test!, @org.jspecify.nullness.Nullable Test!, Test!>!, /*3*/ aNotNullNullNull: TypeArgumentsFromParameterBounds<Test!, @org.jspecify.nullness.Nullable Test!, @org.jspecify.nullness.Nullable Test!>!, /*4*/ a: A!, /*5*/ b: B!, /*6*/ c: C!): kotlin.Unit
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/TypeParameterBounds.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/TypeParameterBounds.txt
index ef9f5dbda66..619d8944a67 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/TypeParameterBounds.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/TypeParameterBounds.txt
@@ -2,16 +2,16 @@ package
 
 public fun </*0*/ T : Test> main(/*0*/ a1: A<kotlin.Any?>, /*1*/ a2: A<Test>, /*2*/ b1: B<kotlin.Any?>, /*3*/ b2: B<Test>, /*4*/ x: T): kotlin.Unit
 
-@org.jspecify.annotations.DefaultNonNull public open class A</*0*/ T : kotlin.Any!> {
+@org.jspecify.nullness.NullMarked public open class A</*0*/ T : kotlin.Any!> {
     public constructor A</*0*/ T : kotlin.Any!>()
     public open fun </*0*/ E : kotlin.Any!> bar(/*0*/ e: E!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open fun foo(/*0*/ @org.jspecify.annotations.NullnessUnspecified t: @org.jspecify.annotations.NullnessUnspecified T!): kotlin.Unit
+    public open fun foo(/*0*/ @org.jspecify.nullness.NullnessUnspecified t: @org.jspecify.nullness.NullnessUnspecified T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class B</*0*/ T : kotlin.Any!> {
+@org.jspecify.nullness.NullMarked public open class B</*0*/ T : kotlin.Any!> {
     public constructor B</*0*/ T : kotlin.Any!>()
     public open fun </*0*/ E : kotlin.Any!> bar(/*0*/ e: E!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -27,10 +27,10 @@ public open class Test {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class TypeParameterBounds {
+@org.jspecify.nullness.NullMarked public open class TypeParameterBounds {
     public constructor TypeParameterBounds()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public/*package*/ open fun </*0*/ T : Test!> main(/*0*/ a1: A<@org.jspecify.annotations.Nullable kotlin.Any!>!, /*1*/ a2: A<Test!>!, /*2*/ b1: B<@org.jspecify.annotations.Nullable kotlin.Any!>!, /*3*/ b2: B<Test!>!, /*4*/ x: T!): kotlin.Unit
+    public/*package*/ open fun </*0*/ T : Test!> main(/*0*/ a1: A<@org.jspecify.nullness.Nullable kotlin.Any!>!, /*1*/ a2: A<Test!>!, /*2*/ b1: B<@org.jspecify.nullness.Nullable kotlin.Any!>!, /*3*/ b2: B<Test!>!, /*4*/ x: T!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
diff --git a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/WildcardsWithDefault.txt b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/WildcardsWithDefault.txt
index 75b527e8dc6..7b1bc5bb428 100644
--- a/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/WildcardsWithDefault.txt
+++ b/compiler/testData/foreignAnnotations/java8Tests/jspecify/kotlin/warnMode/WildcardsWithDefault.txt
@@ -2,24 +2,24 @@ package
 
 public fun main(/*0*/ aNotNullNotNullNotNull: A<kotlin.Any, kotlin.Any, kotlin.Any>, /*1*/ aNotNullNotNullNull: A<kotlin.Any, kotlin.Any, kotlin.Any?>, /*2*/ aNotNullNullNotNull: A<kotlin.Any, kotlin.Any?, kotlin.Any>, /*3*/ aNotNullNullNull: A<kotlin.Any, kotlin.Any?, kotlin.Any?>, /*4*/ b: WildcardsWithDefault): kotlin.Unit
 
-public open class A</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!> {
-    public constructor A</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.annotations.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.annotations.NullnessUnspecified kotlin.Any!>()
+public open class A</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!> {
+    public constructor A</*0*/ T : kotlin.Any!, /*1*/ E : @org.jspecify.nullness.Nullable kotlin.Any!, /*2*/ F : @org.jspecify.nullness.NullnessUnspecified kotlin.Any!>()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class Use {
+@org.jspecify.nullness.NullMarked public open class Use {
     public constructor Use()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 
     // Static members
-    public open fun main(/*0*/ aNotNullNotNullNotNull: A<kotlin.Any!, kotlin.Any!, kotlin.Any!>!, /*1*/ aNotNullNotNullNull: A<kotlin.Any!, kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!>!, /*2*/ aNotNullNullNotNull: A<kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!, kotlin.Any!>!, /*3*/ aNotNullNullNull: A<kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!, @org.jspecify.annotations.Nullable kotlin.Any!>!, /*4*/ b: WildcardsWithDefault!): kotlin.Unit
+    public open fun main(/*0*/ aNotNullNotNullNotNull: A<kotlin.Any!, kotlin.Any!, kotlin.Any!>!, /*1*/ aNotNullNotNullNull: A<kotlin.Any!, kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!>!, /*2*/ aNotNullNullNotNull: A<kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!, kotlin.Any!>!, /*3*/ aNotNullNullNull: A<kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!, @org.jspecify.nullness.Nullable kotlin.Any!>!, /*4*/ b: WildcardsWithDefault!): kotlin.Unit
 }
 
-@org.jspecify.annotations.DefaultNonNull public open class WildcardsWithDefault {
+@org.jspecify.nullness.NullMarked public open class WildcardsWithDefault {
     public constructor WildcardsWithDefault()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
diff --git a/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractJspecifyAnnotationsTest.kt b/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractJspecifyAnnotationsTest.kt
index 6cf3230cf9b..b93cc99452b 100644
--- a/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractJspecifyAnnotationsTest.kt
+++ b/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractJspecifyAnnotationsTest.kt
@@ -168,6 +168,6 @@ abstract class AbstractJspecifyAnnotationsTest : AbstractDiagnosticsTest() {
         private val importSectionRegex = Regex("""((?:import .*?;\n)+)""")
         private val classOrInterfaceRegex = Regex("""(class|interface)""")
         private val publicClassOrInterfaceRegex = Regex("""public (class|interface)""")
-        private val classShapeRegex = Regex("""(\n@DefaultNonNull)?\npublic (class|interface) (\w+)(<[^>]+>)?""")
+        private val classShapeRegex = Regex("""(\n@NullMarked)?\npublic (class|interface) (\w+)(<[^>]+>)?""")
     }
 }
diff --git a/core/compiler.common.jvm/src/org/jetbrains/kotlin/load/java/JvmAnnotationNames.kt b/core/compiler.common.jvm/src/org/jetbrains/kotlin/load/java/JvmAnnotationNames.kt
index ee5e873a67e..fa8e3cea868 100644
--- a/core/compiler.common.jvm/src/org/jetbrains/kotlin/load/java/JvmAnnotationNames.kt
+++ b/core/compiler.common.jvm/src/org/jetbrains/kotlin/load/java/JvmAnnotationNames.kt
@@ -18,10 +18,10 @@ package org.jetbrains.kotlin.load.java
 
 import org.jetbrains.kotlin.name.FqName
 
-val JSPECIFY_NULLABLE = FqName("org.jspecify.annotations.Nullable")
-val JSPECIFY_NULLNESS_UNKNOWN = FqName("org.jspecify.annotations.NullnessUnspecified")
+val JSPECIFY_NULLABLE = FqName("org.jspecify.nullness.Nullable")
+val JSPECIFY_NULLNESS_UNKNOWN = FqName("org.jspecify.nullness.NullnessUnspecified")
 
-val JSPECIFY_DEFAULT_NOT_NULL = FqName("org.jspecify.annotations.DefaultNonNull")
+val JSPECIFY_DEFAULT_NOT_NULL = FqName("org.jspecify.nullness.NullMarked")
 
 val NULLABLE_ANNOTATIONS = listOf(
     JvmAnnotationNames.JETBRAINS_NULLABLE_ANNOTATION,
diff --git a/third-party/jdk8-annotations/org/jspecify/annotations/DefaultNonNull.java b/third-party/jdk8-annotations/org/jspecify/nullness/NullMarked.java
similarity index 90%
rename from third-party/jdk8-annotations/org/jspecify/annotations/DefaultNonNull.java
rename to third-party/jdk8-annotations/org/jspecify/nullness/NullMarked.java
index dcd4dbdd05a..6c6947ad745 100644
--- a/third-party/jdk8-annotations/org/jspecify/annotations/DefaultNonNull.java
+++ b/third-party/jdk8-annotations/org/jspecify/nullness/NullMarked.java
@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-package org.jspecify.annotations;
+package org.jspecify.nullness;
 
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
@@ -14,6 +14,6 @@ import java.lang.annotation.ElementType;
 @Documented
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ElementType.FIELD, ElementType.METHOD, ElementType.TYPE_USE, ElementType.PARAMETER, ElementType.CONSTRUCTOR, ElementType.PACKAGE, ElementType.TYPE})
-public @interface DefaultNonNull {
+public @interface NullMarked {
 
 }
\ No newline at end of file
diff --git a/third-party/jdk8-annotations/org/jspecify/annotations/Nullable.java b/third-party/jdk8-annotations/org/jspecify/nullness/Nullable.java
similarity index 91%
rename from third-party/jdk8-annotations/org/jspecify/annotations/Nullable.java
rename to third-party/jdk8-annotations/org/jspecify/nullness/Nullable.java
index 95e816c94fc..67325615dee 100644
--- a/third-party/jdk8-annotations/org/jspecify/annotations/Nullable.java
+++ b/third-party/jdk8-annotations/org/jspecify/nullness/Nullable.java
@@ -1,4 +1,4 @@
-package org.jspecify.annotations;
+package org.jspecify.nullness;
 
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
diff --git a/third-party/jdk8-annotations/org/jspecify/annotations/NullnessUnspecified.java b/third-party/jdk8-annotations/org/jspecify/nullness/NullnessUnspecified.java
similarity index 94%
rename from third-party/jdk8-annotations/org/jspecify/annotations/NullnessUnspecified.java
rename to third-party/jdk8-annotations/org/jspecify/nullness/NullnessUnspecified.java
index 34a3eab9a81..6e9eeab3d0e 100644
--- a/third-party/jdk8-annotations/org/jspecify/annotations/NullnessUnspecified.java
+++ b/third-party/jdk8-annotations/org/jspecify/nullness/NullnessUnspecified.java
@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-package org.jspecify.annotations;
+package org.jspecify.nullness;
 
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;