diff --git a/src/browser/webapi/encoding/TextDecoderStream.zig b/src/browser/webapi/encoding/TextDecoderStream.zig
index a5b2dc9a..b0b7e45c 100644
--- a/src/browser/webapi/encoding/TextDecoderStream.zig
+++ b/src/browser/webapi/encoding/TextDecoderStream.zig
@@ -72,6 +72,14 @@ pub fn init(label_: ?[]const u8, opts_: ?InitOpts, page: *Page) !TextDecoderStre
     };
 }
 
+pub fn acquireRef(self: *TextDecoderStream) void {
+    self._transform.acquireRef();
+}
+
+pub fn deinit(self: *TextDecoderStream, shutdown: bool, page: *Page) void {
+    self._transform.deinit(shutdown, page);
+}
+
 fn decodeTransform(controller: *TransformStream.DefaultController, chunk: js.Value, ignoreBOM: bool) !void {
     // chunk should be a Uint8Array; decode it as UTF-8 string
     const typed_array = try chunk.toZig(js.TypedArray(u8));
@@ -111,6 +119,8 @@ pub const JsApi = struct {
         pub const name = "TextDecoderStream";
         pub const prototype_chain = bridge.prototypeChain();
         pub var class_id: bridge.ClassId = undefined;
+        pub const weak = true;
+        pub const finalizer = bridge.finalizer(TextDecoderStream.deinit);
     };
 
     pub const constructor = bridge.constructor(TextDecoderStream.init, .{});
diff --git a/src/browser/webapi/encoding/TextEncoderStream.zig b/src/browser/webapi/encoding/TextEncoderStream.zig
index b2526637..a7ae5e2e 100644
--- a/src/browser/webapi/encoding/TextEncoderStream.zig
+++ b/src/browser/webapi/encoding/TextEncoderStream.zig
@@ -34,6 +34,14 @@ pub fn init(page: *Page) !TextEncoderStream {
     };
 }
 
+pub fn acquireRef(self: *TextEncoderStream) void {
+    self._transform.acquireRef();
+}
+
+pub fn deinit(self: *TextEncoderStream, shutdown: bool, page: *Page) void {
+    self._transform.deinit(shutdown, page);
+}
+
 fn encodeTransform(controller: *TransformStream.DefaultController, chunk: js.Value) !void {
     // chunk should be a JS string; encode it as UTF-8 bytes (Uint8Array)
     const str = chunk.isString() orelse return error.InvalidChunk;
@@ -56,6 +64,8 @@ pub const JsApi = struct {
         pub const name = "TextEncoderStream";
         pub const prototype_chain = bridge.prototypeChain();
         pub var class_id: bridge.ClassId = undefined;
+        pub const weak = true;
+        pub const finalizer = bridge.finalizer(TextEncoderStream.deinit);
     };
 
     pub const constructor = bridge.constructor(TextEncoderStream.init, .{});
diff --git a/src/browser/webapi/streams/ReadableStream.zig b/src/browser/webapi/streams/ReadableStream.zig
index e4e5d0f9..7d99a0c1 100644
--- a/src/browser/webapi/streams/ReadableStream.zig
+++ b/src/browser/webapi/streams/ReadableStream.zig
@@ -52,6 +52,8 @@ _pull_fn: ?js.Function.Global = null,
 _pulling: bool = false,
 _pull_again: bool = false,
 _cancel: ?Cancel = null,
+_arena: std.mem.Allocator,
+_rc: usize = 0,
 
 const UnderlyingSource = struct {
     start: ?js.Function = null,
@@ -68,13 +70,18 @@ const QueueingStrategy = struct {
 pub fn init(src_: ?UnderlyingSource, strategy_: ?QueueingStrategy, page: *Page) !*ReadableStream {
     const strategy: QueueingStrategy = strategy_ orelse .{};
 
-    const self = try page._factory.create(ReadableStream{
+    const arena = try page.getArena(.{ .debug = "ReadableStream" });
+    errdefer page.releaseArena(arena);
+
+    const self = try arena.create(ReadableStream);
+    self.* = .{
         ._page = page,
         ._state = .readable,
+        ._arena = arena,
         ._reader = null,
         ._controller = undefined,
         ._stored_error = null,
-    });
+    };
 
     self._controller = try ReadableStreamDefaultController.init(self, strategy.highWaterMark, page);
 
@@ -108,6 +115,23 @@ pub fn initWithData(data: []const u8, page: *Page) !*ReadableStream {
     return stream;
 }
 
+pub fn deinit(self: *ReadableStream, _: bool, page: *Page) void {
+    const rc = self._rc;
+    if (comptime IS_DEBUG) {
+        std.debug.assert(rc != 0);
+    }
+
+    if (rc == 1) {
+        page.releaseArena(self._arena);
+    } else {
+        self._rc = rc - 1;
+    }
+}
+
+pub fn acquireRef(self: *ReadableStream) void {
+    self._rc += 1;
+}
+
 pub fn getReader(self: *ReadableStream, page: *Page) !*ReadableStreamDefaultReader {
     if (self.getLocked()) {
         return error.ReaderLocked;
@@ -120,6 +144,12 @@ pub fn getReader(self: *ReadableStream, page: *Page) !*ReadableStreamDefaultRead
 
 pub fn releaseReader(self: *ReadableStream) void {
     self._reader = null;
+
+    const rc = self._rc;
+    if (comptime IS_DEBUG) {
+        std.debug.assert(rc != 0);
+    }
+    self._rc = rc - 1;
 }
 
 pub fn getAsyncIterator(self: *ReadableStream, page: *Page) !*AsyncIterator {
@@ -367,6 +397,8 @@ pub const JsApi = struct {
         pub const name = "ReadableStream";
         pub const prototype_chain = bridge.prototypeChain();
         pub var class_id: bridge.ClassId = undefined;
+        pub const weak = true;
+        pub const finalizer = bridge.finalizer(ReadableStream.deinit);
     };
 
     pub const constructor = bridge.constructor(ReadableStream.init, .{});
@@ -390,6 +422,14 @@ pub const AsyncIterator = struct {
         });
     }
 
+    pub fn acquireRef(self: *AsyncIterator) void {
+        self._stream.acquireRef();
+    }
+
+    pub fn deinit(self: *AsyncIterator, shutdown: bool, page: *Page) void {
+        self._stream.deinit(shutdown, page);
+    }
+
     pub fn next(self: *AsyncIterator, page: *Page) !js.Promise {
         return self._reader.read(page);
     }
@@ -406,6 +446,8 @@ pub const AsyncIterator = struct {
             pub const name = "ReadableStreamAsyncIterator";
             pub const prototype_chain = bridge.prototypeChain();
             pub var class_id: bridge.ClassId = undefined;
+            pub const weak = true;
+            pub const finalizer = bridge.finalizer(AsyncIterator.deinit);
         };
 
         pub const next = bridge.function(ReadableStream.AsyncIterator.next, .{});
diff --git a/src/browser/webapi/streams/ReadableStreamDefaultController.zig b/src/browser/webapi/streams/ReadableStreamDefaultController.zig
index 18228475..cd6c6352 100644
--- a/src/browser/webapi/streams/ReadableStreamDefaultController.zig
+++ b/src/browser/webapi/streams/ReadableStreamDefaultController.zig
@@ -27,6 +27,8 @@ const ReadableStreamDefaultReader = @import("ReadableStreamDefaultReader.zig");
 
 const IS_DEBUG = @import("builtin").mode == .Debug;
 
+/// ReadableStreamDefaultController uses ReadableStream's arena to make
+/// allocation. Indeed, the controller is owned by its ReadableStream.
 const ReadableStreamDefaultController = @This();
 
 pub const Chunk = union(enum) {
@@ -46,7 +48,6 @@ pub const Chunk = union(enum) {
 
 _page: *Page,
 _stream: *ReadableStream,
-_arena: std.mem.Allocator,
 _queue: std.ArrayList(Chunk),
 _pending_reads: std.ArrayList(js.PromiseResolver.Global),
 _high_water_mark: u32,
@@ -56,15 +57,22 @@ pub fn init(stream: *ReadableStream, high_water_mark: u32, page: *Page) !*Readab
         ._page = page,
         ._queue = .empty,
         ._stream = stream,
-        ._arena = page.arena,
         ._pending_reads = .empty,
         ._high_water_mark = high_water_mark,
     });
 }
 
+pub fn acquireRef(self: *ReadableStreamDefaultController) void {
+    self._stream.acquireRef();
+}
+
+pub fn deinit(self: *ReadableStreamDefaultController, shutdown: bool, page: *Page) void {
+    self._stream.deinit(shutdown, page);
+}
+
 pub fn addPendingRead(self: *ReadableStreamDefaultController, page: *Page) !js.Promise {
     const resolver = page.js.local.?.createPromiseResolver();
-    try self._pending_reads.append(self._arena, try resolver.persist());
+    try self._pending_reads.append(self._stream._arena, try resolver.persist());
     return resolver.promise();
 }
 
@@ -74,8 +82,8 @@ pub fn enqueue(self: *ReadableStreamDefaultController, chunk: Chunk) !void {
     }
 
     if (self._pending_reads.items.len == 0) {
-        const chunk_copy = try chunk.dupe(self._page.arena);
-        return self._queue.append(self._arena, chunk_copy);
+        const chunk_copy = try chunk.dupe(self._stream._arena);
+        return self._queue.append(self._stream._arena, chunk_copy);
     }
 
     // I know, this is ouch! But we expect to have very few (if any)
@@ -109,7 +117,7 @@ pub fn enqueueValue(self: *ReadableStreamDefaultController, value: js.Value) !vo
 
     if (self._pending_reads.items.len == 0) {
         const persisted = try value.persist();
-        try self._queue.append(self._arena, .{ .js_value = persisted });
+        try self._queue.append(self._stream._arena, .{ .js_value = persisted });
         return;
     }
 
@@ -170,7 +178,7 @@ pub fn doError(self: *ReadableStreamDefaultController, err: []const u8) !void {
     }
 
     self._stream._state = .errored;
-    self._stream._stored_error = try self._page.arena.dupe(u8, err);
+    self._stream._stored_error = try self._stream._arena.dupe(u8, err);
 
     // Reject all pending reads
     for (self._pending_reads.items) |resolver| {
@@ -210,6 +218,8 @@ pub const JsApi = struct {
         pub const name = "ReadableStreamDefaultController";
         pub const prototype_chain = bridge.prototypeChain();
         pub var class_id: bridge.ClassId = undefined;
+        pub const weak = true;
+        pub const finalizer = bridge.finalizer(ReadableStreamDefaultController.deinit);
     };
 
     pub const enqueue = bridge.function(ReadableStreamDefaultController.enqueueValue, .{});
diff --git a/src/browser/webapi/streams/ReadableStreamDefaultReader.zig b/src/browser/webapi/streams/ReadableStreamDefaultReader.zig
index 2d3c5bbe..e8c639ce 100644
--- a/src/browser/webapi/streams/ReadableStreamDefaultReader.zig
+++ b/src/browser/webapi/streams/ReadableStreamDefaultReader.zig
@@ -19,6 +19,8 @@
 const std = @import("std");
 const js = @import("../../js/js.zig");
 
+const IS_DEBUG = @import("builtin").mode == .Debug;
+
 const Page = @import("../../Page.zig");
 const ReadableStream = @import("ReadableStream.zig");
 const ReadableStreamDefaultController = @import("ReadableStreamDefaultController.zig");
@@ -35,6 +37,21 @@ pub fn init(stream: *ReadableStream, page: *Page) !*ReadableStreamDefaultReader
     });
 }
 
+pub fn acquireRef(self: *ReadableStreamDefaultReader) void {
+    const stream = self._stream orelse {
+        if (comptime IS_DEBUG) {
+            std.debug.assert(false);
+        }
+        return;
+    };
+    stream.acquireRef();
+}
+
+pub fn deinit(self: *ReadableStreamDefaultReader, shutdown: bool, page: *Page) void {
+    const stream = self._stream orelse return;
+    stream.deinit(shutdown, page);
+}
+
 pub const ReadResult = struct {
     done: bool,
     value: Chunk,
@@ -110,6 +127,8 @@ pub const JsApi = struct {
         pub const name = "ReadableStreamDefaultReader";
         pub const prototype_chain = bridge.prototypeChain();
         pub var class_id: bridge.ClassId = undefined;
+        pub const weak = true;
+        pub const finalizer = bridge.finalizer(ReadableStreamDefaultReader.deinit);
     };
 
     pub const read = bridge.function(ReadableStreamDefaultReader.read, .{});
diff --git a/src/browser/webapi/streams/TransformStream.zig b/src/browser/webapi/streams/TransformStream.zig
index e1f42029..bfed7330 100644
--- a/src/browser/webapi/streams/TransformStream.zig
+++ b/src/browser/webapi/streams/TransformStream.zig
@@ -85,6 +85,14 @@ pub fn initWithZigTransform(zig_transform: ZigTransformFn, page: *Page) !*Transf
     return self;
 }
 
+pub fn acquireRef(self: *TransformStream) void {
+    self._readable.acquireRef();
+}
+
+pub fn deinit(self: *TransformStream, shutdown: bool, page: *Page) void {
+    self._readable.deinit(shutdown, page);
+}
+
 pub fn transformWrite(self: *TransformStream, chunk: js.Value, page: *Page) !void {
     if (self._controller._zig_transform_fn) |zig_fn| {
         // Zig-level transform (used by TextEncoderStream etc.)
@@ -130,6 +138,8 @@ pub const JsApi = struct {
         pub const name = "TransformStream";
         pub const prototype_chain = bridge.prototypeChain();
         pub var class_id: bridge.ClassId = undefined;
+        pub const weak = true;
+        pub const finalizer = bridge.finalizer(TransformStream.deinit);
     };
 
     pub const constructor = bridge.constructor(TransformStream.init, .{});
@@ -165,6 +175,14 @@ pub const TransformStreamDefaultController = struct {
         });
     }
 
+    pub fn acquireRef(self: *TransformStreamDefaultController) void {
+        self._stream.acquireRef();
+    }
+
+    pub fn deinit(self: *TransformStreamDefaultController, shutdown: bool, page: *Page) void {
+        self._stream.deinit(shutdown, page);
+    }
+
     pub fn enqueue(self: *TransformStreamDefaultController, chunk: ReadableStreamDefaultController.Chunk) !void {
         try self._stream._readable._controller.enqueue(chunk);
     }
@@ -189,6 +207,8 @@ pub const TransformStreamDefaultController = struct {
             pub const name = "TransformStreamDefaultController";
             pub const prototype_chain = bridge.prototypeChain();
             pub var class_id: bridge.ClassId = undefined;
+            pub const weak = true;
+            pub const finalizer = bridge.finalizer(TransformStreamDefaultController.deinit);
         };
 
         pub const enqueue = bridge.function(TransformStreamDefaultController.enqueueValue, .{});