diff --git a/nova_vm/src/ecmascript/builtins/indexed_collections/typed_array_objects/typed_array_intrinsic_object.rs b/nova_vm/src/ecmascript/builtins/indexed_collections/typed_array_objects/typed_array_intrinsic_object.rs
index 8b96d7caf..a38a60922 100644
--- a/nova_vm/src/ecmascript/builtins/indexed_collections/typed_array_objects/typed_array_intrinsic_object.rs
+++ b/nova_vm/src/ecmascript/builtins/indexed_collections/typed_array_objects/typed_array_intrinsic_object.rs
@@ -828,13 +828,50 @@ impl TypedArrayPrototype {
         Ok(find_rec.1)
     }
 
+    // ### 23.2.3.14 %TypedArray%.prototype.findLastIndex ( predicate [ , thisArg ] )(https://tc39.es/ecma262/multipage/indexed-collections.html#sec-%typedarray%.prototype.findlastindex)
+    // The interpretation and use of the arguments of this method are the same as for Array.prototype.findLastIndex as defined in 23.1.3.12.
     fn find_last_index<'gc>(
-        _agent: &mut Agent,
-        _this_value: Value,
-        _: ArgumentsList,
-        _gc: GcScope<'gc, '_>,
+        agent: &mut Agent,
+        this_value: Value,
+        arguments: ArgumentsList,
+        gc: GcScope<'gc, '_>,
     ) -> JsResult<Value<'gc>> {
-        todo!()
+        let this_value = this_value.bind(gc.nogc());
+        let predicate = arguments.get(0).scope(agent, gc.nogc());
+        let this_arg = arguments.get(1).scope(agent, gc.nogc());
+        // 1. Let O be the this value.
+        let o = this_value;
+        // 2. Let taRecord be ? ValidateTypedArray(O, seq-cst).
+        let ta_record = validate_typed_array(agent, o, Ordering::SeqCst, gc.nogc())?;
+        let o = ta_record.object;
+        // 3. Let len be TypedArrayLength(taRecord).
+        let len = match o {
+            TypedArray::Int8Array(_)
+            | TypedArray::Uint8Array(_)
+            | TypedArray::Uint8ClampedArray(_) => {
+                typed_array_length::<u8>(agent, &ta_record, gc.nogc())
+            }
+            TypedArray::Int16Array(_) | TypedArray::Uint16Array(_) => {
+                typed_array_length::<u16>(agent, &ta_record, gc.nogc())
+            }
+            #[cfg(feature = "proposal-float16array")]
+            TypedArray::Float16Array(_) => typed_array_length::<f16>(agent, &ta_record, gc.nogc()),
+            TypedArray::Int32Array(_)
+            | TypedArray::Uint32Array(_)
+            | TypedArray::Float32Array(_) => {
+                typed_array_length::<u32>(agent, &ta_record, gc.nogc())
+            }
+            TypedArray::BigInt64Array(_)
+            | TypedArray::BigUint64Array(_)
+            | TypedArray::Float64Array(_) => {
+                typed_array_length::<u64>(agent, &ta_record, gc.nogc())
+            }
+        } as i64;
+        let o = o.into_object().scope(agent, gc.nogc());
+        // 4. Let findRec be ? FindViaPredicate(O, len, descending, predicate, thisArg).
+        let find_rec = find_via_predicate(agent, o, len, false, predicate, this_arg, gc)?;
+        // 5. Return findRec.[[Index]].
+        Ok(Number::try_from(find_rec.0).unwrap().into_value())
     }
 
     // ### [ 23.2.3.15 %TypedArray%.prototype.forEach ( callback [ , thisArg ] )](https://tc39.es/ecma262/multipage/indexed-collections.html#sec-%typedarray%.prototype.foreach)
diff --git a/tests/expectations.json b/tests/expectations.json
index 024266f5e..744cda4da 100644
--- a/tests/expectations.json
+++ b/tests/expectations.json
@@ -9570,40 +9570,6 @@
   "built-ins/TypedArray/prototype/filter/this-is-not-typedarray-instance.js": "CRASH",
   "built-ins/TypedArray/prototype/filter/values-are-not-cached.js": "CRASH",
   "built-ins/TypedArray/prototype/filter/values-are-set.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/detached-buffer.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/get-length-ignores-length-prop.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-changes-value.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-parameters.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-this-non-strict.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-this-strict.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-is-not-callable-throws.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-may-detach-buffer.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-not-called-on-empty-array.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/return-abrupt-from-predicate-call.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/return-abrupt-from-this-out-of-bounds.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/return-index-predicate-result-is-true.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/BigInt/return-negative-one-if-predicate-returns-false-value.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/callbackfn-resize.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/detached-buffer.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/get-length-ignores-length-prop.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/invoked-as-func.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/invoked-as-method.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/predicate-call-changes-value.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/predicate-call-parameters.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/predicate-call-this-non-strict.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/predicate-call-this-strict.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/predicate-is-not-callable-throws.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/predicate-may-detach-buffer.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/predicate-not-called-on-empty-array.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/resizable-buffer-grow-mid-iteration.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/resizable-buffer-shrink-mid-iteration.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/resizable-buffer.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/return-abrupt-from-predicate-call.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/return-abrupt-from-this-out-of-bounds.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/return-index-predicate-result-is-true.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/return-negative-one-if-predicate-returns-false-value.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/this-is-not-object.js": "CRASH",
-  "built-ins/TypedArray/prototype/findLastIndex/this-is-not-typedarray-instance.js": "CRASH",
   "built-ins/TypedArray/prototype/join/BigInt/detached-buffer-during-fromIndex-returns-single-comma.js": "CRASH",
   "built-ins/TypedArray/prototype/join/coerced-separator-shrink.js": "CRASH",
   "built-ins/TypedArray/prototype/join/detached-buffer-during-fromIndex-returns-single-comma.js": "CRASH",
diff --git a/tests/metrics.json b/tests/metrics.json
index 3d8263353..078a41698 100644
--- a/tests/metrics.json
+++ b/tests/metrics.json
@@ -1,8 +1,8 @@
 {
   "results": {
-    "crash": 13036,
-    "fail": 7714,
-    "pass": 25986,
+    "crash": 13000,
+    "fail": 7716,
+    "pass": 26020,
     "skip": 65,
     "timeout": 0,
     "unresolved": 0