diff --git a/packages/sdks-tests/src/e2e-tests/symbols.spec.ts b/packages/sdks-tests/src/e2e-tests/symbols.spec.ts
index 3affc18bbc2..837e51116d5 100644
--- a/packages/sdks-tests/src/e2e-tests/symbols.spec.ts
+++ b/packages/sdks-tests/src/e2e-tests/symbols.spec.ts
@@ -1,7 +1,11 @@
 import type { Page } from '@playwright/test';
 import { expect } from '@playwright/test';
 import { DEFAULT_TEXT_SYMBOL, FRENCH_TEXT_SYMBOL } from '../specs/symbol-with-locale.js';
-import { FIRST_SYMBOL_CONTENT, SECOND_SYMBOL_CONTENT } from '../specs/symbols.js';
+import {
+  FIRST_SYMBOL_CONTENT,
+  SECOND_SYMBOL_CONTENT,
+  GLOBAL_SYMBOL_OWNER_ID,
+} from '../specs/symbols.js';
 import {
   excludeGen2,
   checkIsGen1React,
@@ -245,4 +249,79 @@ test.describe('Symbols', () => {
     const symbols = page.locator(selector);
     await expect(symbols).toHaveCount(2);
   });
+
+  test.describe('global symbols', () => {
+    const symbolUrlMatch = /https:\/\/cdn\.builder\.io\/api\/v3\/content\/symbol\.*/;
+
+    /**
+     * When a symbol block has `global: true` and `ownerId` set to a different space,
+     * the SDK must use `ownerId` as the apiKey in the CDN fetch — not the current space's apiKey.
+     *
+     * Uses `/symbols-with-global` which has block[1] marked as global with GLOBAL_SYMBOL_OWNER_ID.
+     */
+    test('uses ownerId as apiKey when fetching a global symbol', async ({
+      page,
+      packageName,
+      sdk,
+    }) => {
+      test.skip(checkIsGen1React(sdk));
+      test.fail(SSR_FETCHING_PACKAGES.includes(packageName));
+
+      const capturedApiKeys: string[] = [];
+
+      await page.route(symbolUrlMatch, route => {
+        const url = new URL(route.request().url());
+        capturedApiKeys.push(url.searchParams.get('apiKey') || '');
+
+        return route.fulfill({
+          status: 200,
+          json: { results: [FIRST_SYMBOL_CONTENT] },
+        });
+      });
+
+      await page.goto('/symbols-with-global');
+
+      // Wait for symbols to render (ensures the CDN fetch has completed)
+      await expect(page.getByText('default description').locator('visible=true')).toBeVisible();
+
+      // At least one fetch must have used the global symbol owner's apiKey
+      expect(capturedApiKeys).toContain(GLOBAL_SYMBOL_OWNER_ID);
+    });
+
+    /**
+     * When a symbol block does not have the `global` attribute, the SDK must always use the current
+     * space's apiKey — even if `ownerId` is present on the symbol data.
+     *
+     * Uses `/symbols-without-content` which has no global symbols (no `global: true`).
+     * All fetches must use the same apiKey (the current space key).
+     */
+    test('non-global symbol does not use ownerId as apiKey', async ({ page, packageName, sdk }) => {
+      test.skip(checkIsGen1React(sdk));
+      test.fail(SSR_FETCHING_PACKAGES.includes(packageName));
+
+      const capturedApiKeys: string[] = [];
+
+      await page.route(symbolUrlMatch, route => {
+        const url = new URL(route.request().url());
+        capturedApiKeys.push(url.searchParams.get('apiKey') || '');
+
+        return route.fulfill({
+          status: 200,
+          json: { results: [FIRST_SYMBOL_CONTENT] },
+        });
+      });
+
+      await page.goto('/symbols-without-content');
+
+      // Wait for symbols to render (ensures the CDN fetch has completed)
+      await expect(page.getByText('default description').locator('visible=true')).toBeVisible();
+
+      await expect(capturedApiKeys.length).toBeGreaterThanOrEqual(1);
+
+      // All fetches must use the same apiKey — no cross-space key should appear
+      const uniqueKeys = Array.from(new Set(capturedApiKeys));
+      expect(uniqueKeys.length).toBe(1);
+      expect(uniqueKeys[0]).not.toBe(GLOBAL_SYMBOL_OWNER_ID);
+    });
+  });
 });
diff --git a/packages/sdks-tests/src/specs/index.ts b/packages/sdks-tests/src/specs/index.ts
index 49e3fa443a0..5ae41bee3a5 100644
--- a/packages/sdks-tests/src/specs/index.ts
+++ b/packages/sdks-tests/src/specs/index.ts
@@ -46,7 +46,7 @@ import { CONTENT as symbolAbTest } from './symbol-ab-test.js';
 import { CONTENT as symbolBindings } from './symbol-bindings.js';
 import { CONTENT as symbolWithInputBinding } from './symbol-with-input-binding.js';
 import { CONTENT as symbolWithLocale } from './symbol-with-locale.js';
-import { CONTENT_WITHOUT_SYMBOLS, CONTENT as symbols } from './symbols.js';
+import { CONTENT_WITHOUT_SYMBOLS, CONTENT_WITH_GLOBAL_SYMBOL, CONTENT as symbols } from './symbols.js';
 import { TABS } from './tabs.js';
 import { CONTENT as textBlock } from './text-block.js';
 import { CONTENT as textEval } from './text-eval.js';
@@ -137,6 +137,7 @@ export const PAGES: Record<string, Page> = {
   '/symbols': { content: symbols },
   '/js-code': { content: JS_CODE_CONTENT },
   '/symbols-without-content': { content: CONTENT_WITHOUT_SYMBOLS },
+  '/symbols-with-global': { content: CONTENT_WITH_GLOBAL_SYMBOL },
   '/symbol-bindings': { content: symbolBindings },
   '/symbol-with-locale': { content: symbolWithLocale },
   '/link-url': { content: linkUrl },
diff --git a/packages/sdks-tests/src/specs/symbols.ts b/packages/sdks-tests/src/specs/symbols.ts
index 05e1661804a..cccf3edd8f4 100644
--- a/packages/sdks-tests/src/specs/symbols.ts
+++ b/packages/sdks-tests/src/specs/symbols.ts
@@ -738,3 +738,21 @@ const splitUpContent = () => {
 
 export const { CONTENT_WITHOUT_SYMBOLS, FIRST_SYMBOL_CONTENT, SECOND_SYMBOL_CONTENT } =
   splitUpContent();
+
+/**
+ * The API key of the space that owns the global symbol — different from the current space.
+ */
+export const GLOBAL_SYMBOL_OWNER_ID = 'global-owner-space-api-key-abc123';
+
+/**
+ * A page content where:
+ * - block[1] is a GLOBAL symbol (global: true, ownerId = GLOBAL_SYMBOL_OWNER_ID)
+ * - block[2] is a LOCAL symbol (no global/ownerId — uses current space apiKey by default)
+ */
+export const CONTENT_WITH_GLOBAL_SYMBOL = (() => {
+  const clone = JSON.parse(JSON.stringify(CONTENT_WITHOUT_SYMBOLS));
+  // Mark the first symbol as global, owned by a different space.
+  clone.data.blocks[1].component.options.symbol.global = true;
+  clone.data.blocks[1].component.options.symbol.ownerId = GLOBAL_SYMBOL_OWNER_ID;
+  return clone;
+})();
diff --git a/packages/sdks/src/blocks/symbol/symbol.helpers.ts b/packages/sdks/src/blocks/symbol/symbol.helpers.ts
index 762ff853a32..d42406a87ef 100644
--- a/packages/sdks/src/blocks/symbol/symbol.helpers.ts
+++ b/packages/sdks/src/blocks/symbol/symbol.helpers.ts
@@ -10,6 +10,8 @@ export interface SymbolInfo {
   content?: BuilderContent;
   inline?: boolean;
   dynamic?: boolean;
+  ownerId?: string;
+  global?: boolean;
 }
 
 export const fetchSymbolContent = async ({
@@ -35,7 +37,7 @@ export const fetchSymbolContent = async ({
   ) {
     return fetchOneEntry({
       model: symbol.model,
-      apiKey: builderContextValue.apiKey,
+      apiKey: (symbol.global && symbol.ownerId) ? symbol.ownerId : builderContextValue.apiKey,
       apiVersion: builderContextValue.apiVersion,
       ...(symbol?.entry && {
         query: {
diff --git a/packages/sdks/src/blocks/symbol/symbol.lite.tsx b/packages/sdks/src/blocks/symbol/symbol.lite.tsx
index 10ed644a73b..7eced0b524d 100644
--- a/packages/sdks/src/blocks/symbol/symbol.lite.tsx
+++ b/packages/sdks/src/blocks/symbol/symbol.lite.tsx
@@ -132,7 +132,7 @@ export default function Symbol(props: SymbolProps) {
         nonce={props.builderContext.value.nonce}
         isNestedRender
         apiVersion={props.builderContext.value.apiVersion}
-        apiKey={props.builderContext.value.apiKey!}
+        apiKey={(props.symbol?.global && props.symbol?.ownerId) ? props.symbol.ownerId : props.builderContext.value.apiKey!}
         context={{
           ...props.builderContext.value.context,
           symbolId: props.builderBlock?.id,
diff --git a/packages/sdks/src/blocks/symbol/symbol.types.ts b/packages/sdks/src/blocks/symbol/symbol.types.ts
index 80b0b4f5fe7..3904e35655a 100644
--- a/packages/sdks/src/blocks/symbol/symbol.types.ts
+++ b/packages/sdks/src/blocks/symbol/symbol.types.ts
@@ -12,6 +12,8 @@ export interface SymbolInfo {
   content?: BuilderContent;
   inline?: boolean;
   dynamic?: boolean;
+  ownerId?: string;
+  global?: boolean;
 }
 
 export interface SymbolProps