diff --git a/crates/wasm-shrink/src/lib.rs b/crates/wasm-shrink/src/lib.rs
index cf14d7b9fa..25b7ce4a76 100755
--- a/crates/wasm-shrink/src/lib.rs
+++ b/crates/wasm-shrink/src/lib.rs
@@ -223,6 +223,7 @@ impl ShrinkRun {
             bulk_memory: true,
             simd: true,
             threads: true,
+            shared_everything_threads: false,
             tail_call: true,
             multi_memory: true,
             exceptions: true,
diff --git a/crates/wasm-smith/tests/common/mod.rs b/crates/wasm-smith/tests/common/mod.rs
index cc24eed278..b2396cefe5 100644
--- a/crates/wasm-smith/tests/common/mod.rs
+++ b/crates/wasm-smith/tests/common/mod.rs
@@ -19,6 +19,7 @@ pub fn parser_features_from_config(config: &Config) -> WasmFeatures {
         gc: config.gc_enabled,
 
         threads: false,
+        shared_everything_threads: false,
         floats: true,
         extended_const: false,
         component_model: false,
diff --git a/crates/wasm-smith/tests/core.rs b/crates/wasm-smith/tests/core.rs
index 7286952dc6..d5c1f3070b 100644
--- a/crates/wasm-smith/tests/core.rs
+++ b/crates/wasm-smith/tests/core.rs
@@ -168,6 +168,7 @@ fn parser_features_from_config(config: &Config) -> WasmFeatures {
         tail_call: config.tail_call_enabled,
 
         threads: false,
+        shared_everything_threads: false,
         floats: true,
         extended_const: false,
         component_model: false,
diff --git a/crates/wasmparser/src/validator.rs b/crates/wasmparser/src/validator.rs
index 3d77a48039..272120ced7 100644
--- a/crates/wasmparser/src/validator.rs
+++ b/crates/wasmparser/src/validator.rs
@@ -218,6 +218,9 @@ pub struct WasmFeatures {
     pub relaxed_simd: bool,
     /// The WebAssembly threads proposal (enabled by default)
     pub threads: bool,
+    /// The WebAssembly shared-everything-threads proposal; includes new
+    /// component model built-ins.
+    pub shared_everything_threads: bool,
     /// The WebAssembly tail-call proposal (enabled by default)
     pub tail_call: bool,
     /// Whether or not floating-point instructions are enabled.
@@ -266,6 +269,7 @@ impl WasmFeatures {
             simd: true,
             relaxed_simd: true,
             threads: true,
+            shared_everything_threads: true,
             tail_call: true,
             floats: true,
             multi_memory: true,
@@ -377,6 +381,7 @@ impl Default for WasmFeatures {
             gc: false,
             component_model_values: false,
             component_model_nested_names: false,
+            shared_everything_threads: false,
 
             // On-by-default features (phase 4 or greater).
             mutable_global: true,
diff --git a/fuzz/src/validate.rs b/fuzz/src/validate.rs
index c9657a7b98..c1070534c4 100644
--- a/fuzz/src/validate.rs
+++ b/fuzz/src/validate.rs
@@ -32,6 +32,7 @@ pub fn validate_raw_bytes(u: &mut Unstructured<'_>) -> Result<()> {
         reference_types: u.arbitrary()?,
         multi_value: u.arbitrary()?,
         threads: u.arbitrary()?,
+        shared_everything_threads: u.arbitrary()?,
         simd: u.arbitrary()?,
         component_model: u.arbitrary()?,
         tail_call: u.arbitrary()?,
diff --git a/src/bin/wasm-tools/validate.rs b/src/bin/wasm-tools/validate.rs
index 999f8da51d..2352194d82 100644
--- a/src/bin/wasm-tools/validate.rs
+++ b/src/bin/wasm-tools/validate.rs
@@ -102,6 +102,9 @@ fn parse_features(arg: &str) -> Result<WasmFeatures> {
         ("function-references", |f| &mut f.function_references),
         ("simd", |f| &mut f.simd),
         ("threads", |f| &mut f.threads),
+        ("shared-everything-threads", |f| {
+            &mut f.shared_everything_threads
+        }),
         ("bulk-memory", |f| &mut f.bulk_memory),
         ("multi-value", |f| &mut f.multi_value),
         ("tail-call", |f| &mut f.tail_call),
diff --git a/tests/roundtrip.rs b/tests/roundtrip.rs
index f30ab5c1d5..cc751bd1da 100644
--- a/tests/roundtrip.rs
+++ b/tests/roundtrip.rs
@@ -578,6 +578,7 @@ impl TestState {
     fn wasmparser_validator_for(&self, test: &Path) -> Validator {
         let mut features = WasmFeatures {
             threads: true,
+            shared_everything_threads: false,
             reference_types: true,
             simd: true,
             relaxed_simd: true,
@@ -637,6 +638,10 @@ impl TestState {
                 "tail-call" => features.tail_call = true,
                 "memory64" => features.memory64 = true,
                 "component-model" => features.component_model = true,
+                "shared-everything-threads" => {
+                    features.component_model = true;
+                    features.shared_everything_threads = true;
+                }
                 "multi-memory" => features.multi_memory = true,
                 "extended-const" => features.extended_const = true,
                 "function-references" => features.function_references = true,