diff --git a/.changeset/warm-tickets-finish.md b/.changeset/warm-tickets-finish.md
new file mode 100644
index 00000000000..be3a9a5c32f
--- /dev/null
+++ b/.changeset/warm-tickets-finish.md
@@ -0,0 +1,5 @@
+---
+'@clerk/react': patch
+---
+
+Ensure ticket-based sign-in and sign-up flows started before Clerk finishes loading can be finalized successfully.
diff --git a/packages/react/src/__tests__/stateProxy.test.ts b/packages/react/src/__tests__/stateProxy.test.ts
new file mode 100644
index 00000000000..28e3f366619
--- /dev/null
+++ b/packages/react/src/__tests__/stateProxy.test.ts
@@ -0,0 +1,167 @@
+import type { SignInFutureResource, SignUpFutureResource } from '@clerk/shared/types';
+import { describe, expect, it, vi } from 'vitest';
+
+import { StateProxy } from '../stateProxy';
+
+describe('StateProxy', () => {
+  it('preserves a completed sign-in across chained calls when the client clears its sign-in attempt', async () => {
+    const emptySignIn = {
+      status: 'needs_identifier',
+      createdSessionId: null as string | null,
+      ticket: vi.fn(() => Promise.resolve({ error: null })),
+      finalize: vi.fn(() => Promise.reject(new Error('Cannot finalize sign-in without a created session.'))),
+    };
+    const completedSignIn = {
+      status: 'needs_identifier',
+      createdSessionId: null as string | null,
+      ticket: vi.fn(() => {
+        client.signIn = { __internal_future: emptySignIn };
+        completedSignIn.status = 'complete';
+        completedSignIn.createdSessionId = 'sess_123';
+        return Promise.resolve({ error: null });
+      }),
+      finalize: vi.fn(() => Promise.resolve({ error: null })),
+    };
+    const client = {
+      signIn: { __internal_future: completedSignIn },
+    };
+    const state = {
+      signInSignal: () => ({ signIn: completedSignIn }),
+    };
+    const loadedCallbacks: Array<() => void> = [];
+    const isomorphicClerk = {
+      loaded: false,
+      client,
+      __internal_state: state,
+      addOnLoaded: vi.fn((callback: () => void) => loadedCallbacks.push(callback)),
+    };
+    const signIn = new StateProxy(isomorphicClerk as any).signInSignal().signIn as SignInFutureResource;
+
+    const ticketPromise = signIn.ticket({ ticket: 'ticket_123' });
+    expect(isomorphicClerk.addOnLoaded).toHaveBeenCalledOnce();
+    expect(completedSignIn.ticket).not.toHaveBeenCalled();
+
+    isomorphicClerk.loaded = true;
+    loadedCallbacks.forEach(callback => callback());
+    await ticketPromise;
+
+    await expect(signIn.finalize()).resolves.toEqual({ error: null });
+    expect(signIn.status).toBe('complete');
+    expect(signIn.createdSessionId).toBe('sess_123');
+    expect(completedSignIn.finalize).toHaveBeenCalledOnce();
+    expect(emptySignIn.finalize).not.toHaveBeenCalled();
+  });
+
+  it('preserves a completed sign-up across chained calls when the client clears its sign-up attempt', async () => {
+    const emptySignUp = {
+      status: 'missing_requirements',
+      createdSessionId: null as string | null,
+      ticket: vi.fn(() => Promise.resolve({ error: null })),
+      finalize: vi.fn(() =>
+        Promise.resolve({ error: new Error('Cannot finalize sign-up without a created session.') }),
+      ),
+    };
+    const completedSignUp = {
+      status: 'missing_requirements',
+      createdSessionId: null as string | null,
+      ticket: vi.fn(() => {
+        client.signUp = { __internal_future: emptySignUp };
+        completedSignUp.status = 'complete';
+        completedSignUp.createdSessionId = 'sess_123';
+        return Promise.resolve({ error: null });
+      }),
+      finalize: vi.fn(() => Promise.resolve({ error: null })),
+    };
+    const client: {
+      signUp: { __internal_future: typeof completedSignUp | typeof emptySignUp };
+    } = {
+      signUp: { __internal_future: completedSignUp },
+    };
+    const state = {
+      signUpSignal: () => ({ signUp: completedSignUp }),
+    };
+    const loadedCallbacks: Array<() => void> = [];
+    const isomorphicClerk = {
+      loaded: false,
+      client,
+      __internal_state: state,
+      addOnLoaded: vi.fn((callback: () => void) => loadedCallbacks.push(callback)),
+    };
+    const signUp = new StateProxy(isomorphicClerk as any).signUpSignal().signUp as SignUpFutureResource;
+
+    const ticketPromise = signUp.ticket({ ticket: 'ticket_123' });
+    expect(isomorphicClerk.addOnLoaded).toHaveBeenCalledOnce();
+    expect(completedSignUp.ticket).not.toHaveBeenCalled();
+
+    isomorphicClerk.loaded = true;
+    loadedCallbacks.forEach(callback => callback());
+    await ticketPromise;
+
+    await expect(signUp.finalize()).resolves.toEqual({ error: null });
+    expect(signUp.status).toBe('complete');
+    expect(signUp.createdSessionId).toBe('sess_123');
+    expect(completedSignUp.finalize).toHaveBeenCalledOnce();
+    expect(emptySignUp.finalize).not.toHaveBeenCalled();
+  });
+
+  it('falls back to the client sign-in when the state signal is empty', async () => {
+    const clientSignIn = {
+      status: 'needs_first_factor',
+      create: vi.fn(() => Promise.resolve({ error: null })),
+    };
+    const isomorphicClerk = {
+      loaded: true,
+      client: { signIn: { __internal_future: clientSignIn } },
+      __internal_state: { signInSignal: () => ({ signIn: null }) },
+    };
+    const signIn = new StateProxy(isomorphicClerk as any).signInSignal().signIn as SignInFutureResource;
+
+    await expect(signIn.create({ identifier: 'test@example.com' })).resolves.toEqual({ error: null });
+    expect(signIn.status).toBe('needs_first_factor');
+    expect(clientSignIn.create).toHaveBeenCalledOnce();
+  });
+
+  it('uses a newer sign-in from the state signal instead of the client attempt', async () => {
+    const clientSignIn = {
+      finalize: vi.fn(() => Promise.reject(new Error('Finalized the stale client sign-in.'))),
+    };
+    const currentSignIn = {
+      finalize: vi.fn(() => Promise.resolve({ error: null })),
+    };
+    const isomorphicClerk = {
+      loaded: true,
+      client: { signIn: { __internal_future: clientSignIn } },
+      __internal_state: { signInSignal: () => ({ signIn: currentSignIn }) },
+    };
+    const signIn = new StateProxy(isomorphicClerk as any).signInSignal().signIn as SignInFutureResource;
+
+    await expect(signIn.finalize()).resolves.toEqual({ error: null });
+    expect(currentSignIn.finalize).toHaveBeenCalledOnce();
+    expect(clientSignIn.finalize).not.toHaveBeenCalled();
+  });
+
+  it('falls back to the fresh client sign-in after the retained state attempt is cleared', async () => {
+    const clientSignIn = {
+      status: 'needs_identifier',
+    };
+    let stateSignIn: { status: string; finalize: ReturnType<typeof vi.fn> } | null;
+    const completedSignIn = {
+      status: 'complete',
+      finalize: vi.fn(() => {
+        stateSignIn = null;
+        return Promise.resolve({ error: null });
+      }),
+    };
+    stateSignIn = completedSignIn;
+    const isomorphicClerk = {
+      loaded: true,
+      client: { signIn: { __internal_future: clientSignIn } },
+      __internal_state: { signInSignal: () => ({ signIn: stateSignIn }) },
+    };
+    const signIn = new StateProxy(isomorphicClerk as any).signInSignal().signIn as SignInFutureResource;
+
+    expect(signIn.status).toBe('complete');
+    await expect(signIn.finalize()).resolves.toEqual({ error: null });
+    expect(signIn.status).toBe('needs_identifier');
+  });
+});
diff --git a/packages/react/src/stateProxy.ts b/packages/react/src/stateProxy.ts
index 3066d4e1583..efa9db73f93 100644
--- a/packages/react/src/stateProxy.ts
+++ b/packages/react/src/stateProxy.ts
@@ -134,13 +134,15 @@ export class StateProxy implements State {
 
   private buildSignInProxy() {
     const gateProperty = this.gateProperty.bind(this);
-    const target = () => this.client.signIn.__internal_future;
+    const target = () => this.state.signInSignal().signIn ?? this.client.signIn.__internal_future;
 
     return {
       errors: defaultSignInErrors(),
       fetchStatus: 'idle' as const,
       signIn: {
-        status: 'needs_identifier' as const,
+        get status() {
+          return gateProperty(target, 'status', 'needs_identifier');
+        },
         availableStrategies: [],
         get isTransferable() {
           return gateProperty(target, 'isTransferable', false);
@@ -255,7 +257,7 @@ export class StateProxy implements State {
   private buildSignUpProxy() {
     const gateProperty = this.gateProperty.bind(this);
     const gateMethod = this.gateMethod.bind(this);
-    const target = () => this.client.signUp.__internal_future;
+    const target = () => this.state.signUpSignal().signUp ?? this.client.signUp.__internal_future;
 
     return {
       errors: defaultSignUpErrors(),