diff --git a/packages/puppeteer-core/src/bidi/core/Browser.ts b/packages/puppeteer-core/src/bidi/core/Browser.ts
index c845f66b79f..efeabc3a590 100644
--- a/packages/puppeteer-core/src/bidi/core/Browser.ts
+++ b/packages/puppeteer-core/src/bidi/core/Browser.ts
@@ -11,7 +11,7 @@ import {inertIfDisposed, throwIfDisposed} from '../../util/decorators.js';
 import {DisposableStack, disposeSymbol} from '../../util/disposable.js';
 
 import type {BrowsingContext} from './BrowsingContext.js';
-import type {SharedWorkerRealm} from './Realm.js';
+import {SharedWorkerRealm} from './Realm.js';
 import type {Session} from './Session.js';
 import {UserContext} from './UserContext.js';
 
@@ -57,6 +57,7 @@ export class Browser extends EventEmitter<{
   readonly #disposables = new DisposableStack();
   readonly #userContexts = new Map<string, UserContext>();
   readonly session: Session;
+  readonly #sharedWorkers = new Map<string, SharedWorkerRealm>();
   // keep-sorted end
 
   private constructor(session: Session) {
@@ -75,9 +76,13 @@ export class Browser extends EventEmitter<{
     });
 
     sessionEmitter.on('script.realmCreated', info => {
-      if (info.type === 'shared-worker') {
-        // TODO: Create a SharedWorkerRealm.
+      if (info.type !== 'shared-worker') {
+        return;
       }
+      this.#sharedWorkers.set(
+        info.realm,
+        SharedWorkerRealm.from(this, info.realm, info.origin)
+      );
     });
 
     await this.#syncUserContexts();
diff --git a/packages/puppeteer-core/src/bidi/core/BrowsingContext.ts b/packages/puppeteer-core/src/bidi/core/BrowsingContext.ts
index 89ffae5ab32..711018bc307 100644
--- a/packages/puppeteer-core/src/bidi/core/BrowsingContext.ts
+++ b/packages/puppeteer-core/src/bidi/core/BrowsingContext.ts
@@ -12,6 +12,7 @@ import {DisposableStack, disposeSymbol} from '../../util/disposable.js';
 
 import type {AddPreloadScriptOptions} from './Browser.js';
 import {Navigation} from './Navigation.js';
+import type {DedicatedWorkerRealm} from './Realm.js';
 import {WindowRealm} from './Realm.js';
 import {Request} from './Request.js';
 import type {UserContext} from './UserContext.js';
@@ -103,6 +104,11 @@ export class BrowsingContext extends EventEmitter<{
   DOMContentLoaded: void;
   /** Emitted whenever the frame emits `load` */
   load: void;
+  /** Emitted whenever a dedicated worker is created */
+  worker: {
+    /** The realm for the new dedicated worker */
+    realm: DedicatedWorkerRealm;
+  };
 }> {
   static from(
     userContext: UserContext,
@@ -143,7 +149,7 @@ export class BrowsingContext extends EventEmitter<{
     this.userContext = context;
     // keep-sorted end
 
-    this.defaultRealm = WindowRealm.from(this);
+    this.defaultRealm = this.#createWindowRealm();
   }
 
   #initialize() {
@@ -283,7 +289,12 @@ export class BrowsingContext extends EventEmitter<{
     return this.closed;
   }
   get realms(): Iterable<WindowRealm> {
-    return this.#realms.values();
+    // eslint-disable-next-line @typescript-eslint/no-this-alias -- Required
+    const self = this;
+    return (function* () {
+      yield self.defaultRealm;
+      yield* self.#realms.values();
+    })();
   }
   get top(): BrowsingContext {
     let context = this as BrowsingContext;
@@ -297,6 +308,14 @@ export class BrowsingContext extends EventEmitter<{
   }
   // keep-sorted end
 
+  #createWindowRealm(sandbox?: string) {
+    const realm = WindowRealm.from(this, sandbox);
+    realm.on('worker', realm => {
+      this.emit('worker', {realm});
+    });
+    return realm;
+  }
+
   @inertIfDisposed
   private dispose(reason?: string): void {
     this.#reason = reason;
@@ -444,7 +463,7 @@ export class BrowsingContext extends EventEmitter<{
     return context.#reason!;
   })
   createWindowRealm(sandbox: string): WindowRealm {
-    return WindowRealm.from(this, sandbox);
+    return this.#createWindowRealm(sandbox);
   }
 
   @throwIfDisposed<BrowsingContext>(context => {
diff --git a/packages/puppeteer-core/src/bidi/core/Realm.ts b/packages/puppeteer-core/src/bidi/core/Realm.ts
index 18a5b3c722d..c0aa37fb85c 100644
--- a/packages/puppeteer-core/src/bidi/core/Realm.ts
+++ b/packages/puppeteer-core/src/bidi/core/Realm.ts
@@ -10,6 +10,7 @@ import {EventEmitter} from '../../common/EventEmitter.js';
 import {inertIfDisposed, throwIfDisposed} from '../../util/decorators.js';
 import {DisposableStack, disposeSymbol} from '../../util/disposable.js';
 
+import type {Browser} from './Browser.js';
 import type {BrowsingContext} from './BrowsingContext.js';
 import type {Session} from './Session.js';
 
@@ -145,13 +146,7 @@ export class WindowRealm extends Realm {
   readonly sandbox?: string;
   // keep-sorted end
 
-  readonly #workers: {
-    dedicated: Map<string, DedicatedWorkerRealm>;
-    shared: Map<string, SharedWorkerRealm>;
-  } = {
-    dedicated: new Map(),
-    shared: new Map(),
-  };
+  readonly #workers = new Map<string, DedicatedWorkerRealm>();
 
   private constructor(context: BrowsingContext, sandbox?: string) {
     super('', '');
@@ -191,32 +186,16 @@ export class WindowRealm extends Realm {
       }
 
       const realm = DedicatedWorkerRealm.from(this, info.realm, info.origin);
-      this.#workers.dedicated.set(realm.id, realm);
+      this.#workers.set(realm.id, realm);
 
       const realmEmitter = this.disposables.use(new EventEmitter(realm));
       realmEmitter.once('destroyed', () => {
         realmEmitter.removeAllListeners();
-        this.#workers.dedicated.delete(realm.id);
+        this.#workers.delete(realm.id);
       });
 
       this.emit('worker', realm);
     });
-
-    this.browsingContext.userContext.browser.on('sharedworker', ({realm}) => {
-      if (!realm.owners.has(this)) {
-        return;
-      }
-
-      this.#workers.shared.set(realm.id, realm);
-
-      const realmEmitter = this.disposables.use(new EventEmitter(realm));
-      realmEmitter.once('destroyed', () => {
-        realmEmitter.removeAllListeners();
-        this.#workers.shared.delete(realm.id);
-      });
-
-      this.emit('sharedworker', realm);
-    });
   }
 
   override get session(): Session {
@@ -302,28 +281,20 @@ export class DedicatedWorkerRealm extends Realm {
  * @internal
  */
 export class SharedWorkerRealm extends Realm {
-  static from(
-    owners: [WindowRealm, ...WindowRealm[]],
-    id: string,
-    origin: string
-  ): SharedWorkerRealm {
-    const realm = new SharedWorkerRealm(owners, id, origin);
+  static from(browser: Browser, id: string, origin: string): SharedWorkerRealm {
+    const realm = new SharedWorkerRealm(browser, id, origin);
     realm.#initialize();
     return realm;
   }
 
   // keep-sorted start
   readonly #workers = new Map<string, DedicatedWorkerRealm>();
-  readonly owners: Set<WindowRealm>;
+  readonly browser: Browser;
   // keep-sorted end
 
-  private constructor(
-    owners: [WindowRealm, ...WindowRealm[]],
-    id: string,
-    origin: string
-  ) {
+  private constructor(browser: Browser, id: string, origin: string) {
     super(id, origin);
-    this.owners = new Set(owners);
+    this.browser = browser;
   }
 
   #initialize(): void {
@@ -355,7 +326,6 @@ export class SharedWorkerRealm extends Realm {
   }
 
   override get session(): Session {
-    // SAFETY: At least one owner will exist.
-    return this.owners.values().next().value.session;
+    return this.browser.session;
   }
 }