diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.client.config.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.client.config.ts
index e8b628595975..3cbea64827cb 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.client.config.ts
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/sentry.client.config.ts
@@ -8,7 +8,7 @@ Sentry.init({
   tracesSampleRate: 1.0,
   integrations: [
     Sentry.piniaIntegration(usePinia(), {
-      actionTransformer: action => `Transformed: ${action}`,
+      actionTransformer: action => `${action}.transformed`,
       stateTransformer: state => ({
         transformed: true,
         ...state,
diff --git a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/pinia.test.ts b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/pinia.test.ts
index 44b057a29f15..613d010f931b 100644
--- a/dev-packages/e2e-tests/test-applications/nuxt-4/tests/pinia.test.ts
+++ b/dev-packages/e2e-tests/test-applications/nuxt-4/tests/pinia.test.ts
@@ -18,10 +18,10 @@ test('sends pinia action breadcrumbs and state context', async ({ page }) => {
   expect(error).toBeTruthy();
   expect(error.breadcrumbs?.length).toBeGreaterThan(0);
 
-  const actionBreadcrumb = error.breadcrumbs?.find(breadcrumb => breadcrumb.category === 'action');
+  const actionBreadcrumb = error.breadcrumbs?.find(breadcrumb => breadcrumb.category === 'pinia.action');
 
   expect(actionBreadcrumb).toBeDefined();
-  expect(actionBreadcrumb?.message).toBe('Transformed: addItem');
+  expect(actionBreadcrumb?.message).toBe('Store: cart | Action: addItem.transformed');
   expect(actionBreadcrumb?.level).toBe('info');
 
   const stateContext = error.contexts?.state?.state;
@@ -30,6 +30,6 @@ test('sends pinia action breadcrumbs and state context', async ({ page }) => {
   expect(stateContext?.type).toBe('pinia');
   expect(stateContext?.value).toEqual({
     transformed: true,
-    rawItems: ['item'],
+    cart: { rawItems: ['item'] },
   });
 });
diff --git a/dev-packages/e2e-tests/test-applications/vue-3/src/main.ts b/dev-packages/e2e-tests/test-applications/vue-3/src/main.ts
index 4a08ed4ddbcc..340820d333ec 100644
--- a/dev-packages/e2e-tests/test-applications/vue-3/src/main.ts
+++ b/dev-packages/e2e-tests/test-applications/vue-3/src/main.ts
@@ -31,7 +31,7 @@ Sentry.init({
 
 pinia.use(
   Sentry.createSentryPiniaPlugin({
-    actionTransformer: action => `Transformed: ${action}`,
+    actionTransformer: action => `${action}.transformed`,
     stateTransformer: state => ({
       transformed: true,
       ...state,
diff --git a/dev-packages/e2e-tests/test-applications/vue-3/src/stores/cart.ts b/dev-packages/e2e-tests/test-applications/vue-3/src/stores/cart.ts
index 7786c7f27cd9..2f406b19b5a6 100644
--- a/dev-packages/e2e-tests/test-applications/vue-3/src/stores/cart.ts
+++ b/dev-packages/e2e-tests/test-applications/vue-3/src/stores/cart.ts
@@ -1,7 +1,6 @@
 import { acceptHMRUpdate, defineStore } from 'pinia';
 
-export const useCartStore = defineStore({
-  id: 'cart',
+export const useCartStore = defineStore('cart', {
   state: () => ({
     rawItems: [] as string[],
   }),
diff --git a/dev-packages/e2e-tests/test-applications/vue-3/src/stores/counter.ts b/dev-packages/e2e-tests/test-applications/vue-3/src/stores/counter.ts
new file mode 100644
index 000000000000..ae315c62ba8a
--- /dev/null
+++ b/dev-packages/e2e-tests/test-applications/vue-3/src/stores/counter.ts
@@ -0,0 +1,10 @@
+import { defineStore } from 'pinia';
+
+export const useCounterStore = defineStore('counter', {
+  state: () => ({ name: 'Counter Store', count: 0 }),
+  actions: {
+    increment() {
+      this.count++;
+    },
+  },
+});
diff --git a/dev-packages/e2e-tests/test-applications/vue-3/src/views/CartView.vue b/dev-packages/e2e-tests/test-applications/vue-3/src/views/CartView.vue
index ba7037e68bfe..06510a276192 100644
--- a/dev-packages/e2e-tests/test-applications/vue-3/src/views/CartView.vue
+++ b/dev-packages/e2e-tests/test-applications/vue-3/src/views/CartView.vue
@@ -29,50 +29,45 @@
           data-testid="clear"
         >Clear the cart</button>
       </form>
+
+      <br/>
+
+      <div>
+        <h3>Counter: {{ $counter.count }}</h3>
+        <button @click="$counter.increment">+</button>
+      </div>
     </div>
   </Layout>
 </template>
 
-<script lang="ts">
-import { defineComponent, ref } from 'vue'
+<script setup lang="ts">
+import { ref } from 'vue'
 import { useCartStore } from '../stores/cart'
+import { useCounterStore } from '@/stores/counter';
 
+const cart = useCartStore()
+const $counter = useCounterStore()
 
-export default defineComponent({
-  setup() {
-    const cart = useCartStore()
-
-    const itemName = ref('')
-
-    function addItemToCart() {
-      if (!itemName.value) return
-      cart.addItem(itemName.value)
-      itemName.value = ''
-    }
+const itemName = ref('')
 
-    function throwError() {
-      throw new Error('This is an error')
-    }
-
-    function clearCart() {
-      if (window.confirm('Are you sure you want to clear the cart?')) {
-        cart.rawItems = []
-      }
-    }
+function addItemToCart() {
+  if (!itemName.value) return
+  cart.addItem(itemName.value)
+  itemName.value = ''
+}
 
-    // @ts-ignore
-    window.stores = { cart }
+function throwError() {
+  throw new Error('This is an error')
+}
 
-    return {
-      itemName,
-      addItemToCart,
-      cart,
+function clearCart() {
+  if (window.confirm('Are you sure you want to clear the cart?')) {
+    cart.rawItems = []
+  }
+}
 
-      throwError,
-      clearCart,
-    }
-  },
-})
+// @ts-ignore
+window.stores = { cart }
 </script>
 
 <style scoped>
diff --git a/dev-packages/e2e-tests/test-applications/vue-3/tests/pinia.test.ts b/dev-packages/e2e-tests/test-applications/vue-3/tests/pinia.test.ts
index 5699ebc24b7c..08de54ddeff9 100644
--- a/dev-packages/e2e-tests/test-applications/vue-3/tests/pinia.test.ts
+++ b/dev-packages/e2e-tests/test-applications/vue-3/tests/pinia.test.ts
@@ -18,10 +18,10 @@ test('sends pinia action breadcrumbs and state context', async ({ page }) => {
   expect(error).toBeTruthy();
   expect(error.breadcrumbs?.length).toBeGreaterThan(0);
 
-  const actionBreadcrumb = error.breadcrumbs?.find(breadcrumb => breadcrumb.category === 'action');
+  const actionBreadcrumb = error.breadcrumbs?.find(breadcrumb => breadcrumb.category === 'pinia.action');
 
   expect(actionBreadcrumb).toBeDefined();
-  expect(actionBreadcrumb?.message).toBe('Transformed: addItem');
+  expect(actionBreadcrumb?.message).toBe('Store: cart | Action: addItem.transformed');
   expect(actionBreadcrumb?.level).toBe('info');
 
   const stateContext = error.contexts?.state?.state;
@@ -30,6 +30,75 @@ test('sends pinia action breadcrumbs and state context', async ({ page }) => {
   expect(stateContext?.type).toBe('pinia');
   expect(stateContext?.value).toEqual({
     transformed: true,
-    rawItems: ['item'],
+    cart: {
+      rawItems: ['item'],
+    },
+    counter: {
+      count: 0,
+      name: 'Counter Store',
+    },
   });
 });
+
+test('state transformer receives full state object and is stored in state context', async ({ page }) => {
+  await page.goto('/cart');
+
+  await page.locator('#item-input').fill('multiple store test');
+  await page.locator('#item-add').click();
+
+  await page.locator('button:text("+")').click();
+  await page.locator('button:text("+")').click();
+  await page.locator('button:text("+")').click();
+
+  await page.locator('#item-input').fill('multiple store pinia');
+  await page.locator('#item-add').click();
+
+  const errorPromise = waitForError('vue-3', async errorEvent => {
+    return errorEvent?.exception?.values?.[0].value === 'This is an error';
+  });
+
+  await page.locator('#throw-error').click();
+
+  const error = await errorPromise;
+
+  // Verify stateTransformer was called with full state and modified state
+  const stateContext = error.contexts?.state?.state;
+
+  expect(stateContext?.value).toEqual({
+    transformed: true,
+    cart: {
+      rawItems: ['multiple store test', 'multiple store pinia'],
+    },
+    counter: {
+      name: 'Counter Store',
+      count: 3,
+    },
+  });
+});
+
+test('different store interaction order maintains full state tracking', async ({ page }) => {
+  await page.goto('/cart');
+
+  await page.locator('button:text("+")').click();
+
+  await page.locator('#item-input').fill('order test item');
+  await page.locator('#item-add').click();
+
+  await page.locator('button:text("+")').click();
+
+  const errorPromise = waitForError('vue-3', async errorEvent => {
+    return errorEvent?.exception?.values?.[0].value === 'This is an error';
+  });
+
+  await page.locator('#throw-error').click();
+
+  const error = await errorPromise;
+
+  const stateContext = error.contexts?.state?.state;
+
+  expect(stateContext).toBeDefined();
+
+  const stateValue = stateContext?.value;
+  expect(stateValue.cart.rawItems).toEqual(['order test item']);
+  expect(stateValue.counter.count).toBe(2);
+});
diff --git a/docs/migration/v8-to-v9.md b/docs/migration/v8-to-v9.md
index 94fd64683c69..ac2648059143 100644
--- a/docs/migration/v8-to-v9.md
+++ b/docs/migration/v8-to-v9.md
@@ -357,10 +357,12 @@ All exports and APIs of `@sentry/utils` and `@sentry/types` (except for the ones
   ```
 
 - The option `logErrors` in the `vueIntegration` has been removed. The Sentry Vue error handler will always propagate the error to a user-defined error handler or re-throw the error (which will log the error without modifying).
+- The option `stateTransformer` in `createSentryPiniaPlugin()` now receives the full state from all stores as its parameter. The top-level keys of the state object are the store IDs.
 
 ### `@sentry/nuxt`
 
 - The `tracingOptions` option in `Sentry.init()` was removed in favor of passing the `vueIntegration()` to `Sentry.init({ integrations: [...] })` and setting `tracingOptions` there.
+- The option `stateTransformer` in the `piniaIntegration` now receives the full state from all stores as its parameter. The top-level keys of the state object are the store IDs.
 
 ### `@sentry/vue` and `@sentry/nuxt`
 
diff --git a/packages/vue/src/pinia.ts b/packages/vue/src/pinia.ts
index f6731afcd6ce..2448a30c4f08 100644
--- a/packages/vue/src/pinia.ts
+++ b/packages/vue/src/pinia.ts
@@ -1,19 +1,22 @@
 import { addBreadcrumb, addNonEnumerableProperty, getClient, getCurrentScope, getGlobalScope } from '@sentry/core';
+import type { Ref } from 'vue';
 
-// Inline PiniaPlugin type
+// Inline Pinia types
+type StateTree = Record<string | number | symbol, any>;
 type PiniaPlugin = (context: {
   store: {
     $id: string;
     $state: unknown;
     $onAction: (callback: (context: { name: string; after: (callback: () => void) => void }) => void) => void;
   };
+  pinia: { state: Ref<Record<string, StateTree>> };
 }) => void;
 
 type SentryPiniaPluginOptions = {
   attachPiniaState?: boolean;
   addBreadcrumbs?: boolean;
-  actionTransformer?: (action: any) => any;
-  stateTransformer?: (state: any) => any;
+  actionTransformer?: (action: string) => any;
+  stateTransformer?: (state: Record<string, unknown>) => any;
 };
 
 export const createSentryPiniaPlugin: (options?: SentryPiniaPluginOptions) => PiniaPlugin = (
@@ -24,19 +27,29 @@ export const createSentryPiniaPlugin: (options?: SentryPiniaPluginOptions) => Pi
     stateTransformer: state => state,
   },
 ) => {
-  const plugin: PiniaPlugin = ({ store }) => {
+  const plugin: PiniaPlugin = ({ store, pinia }) => {
+    const getAllStoreStates = (): Record<string, unknown> => {
+      const states: Record<string, unknown> = {};
+
+      Object.keys(pinia.state.value).forEach(storeId => {
+        states[storeId] = pinia.state.value[storeId];
+      });
+
+      return states;
+    };
+
     options.attachPiniaState !== false &&
       getGlobalScope().addEventProcessor((event, hint) => {
         try {
           // Get current timestamp in hh:mm:ss
           const timestamp = new Date().toTimeString().split(' ')[0];
-          const filename = `pinia_state_${store.$id}_${timestamp}.json`;
+          const filename = `pinia_state_all_stores_${timestamp}.json`;
 
           hint.attachments = [
             ...(hint.attachments || []),
             {
               filename,
-              data: JSON.stringify(store.$state),
+              data: JSON.stringify(getAllStoreStates()),
             },
           ];
         } catch (_) {
@@ -58,14 +71,15 @@ export const createSentryPiniaPlugin: (options?: SentryPiniaPluginOptions) => Pi
           options.addBreadcrumbs !== false
         ) {
           addBreadcrumb({
-            category: 'action',
-            message: transformedActionName,
+            category: 'pinia.action',
+            message: `Store: ${store.$id} | Action: ${transformedActionName}`,
             level: 'info',
           });
         }
 
-        /* Set latest state to scope */
-        const transformedState = options.stateTransformer ? options.stateTransformer(store.$state) : store.$state;
+        /* Set latest state of all stores to scope */
+        const allStates = getAllStoreStates();
+        const transformedState = options.stateTransformer ? options.stateTransformer(allStates) : allStates;
         const scope = getCurrentScope();
         const currentState = scope.getScopeData().contexts.state;