diff --git a/.changeset/mosaic-contact-list-flip.md b/.changeset/mosaic-contact-list-flip.md
new file mode 100644
index 00000000000..c554feb68be
--- /dev/null
+++ b/.changeset/mosaic-contact-list-flip.md
@@ -0,0 +1,5 @@
+---
+'@clerk/ui': patch
+---
+
+The Mosaic `UserProfile` email and phone number lists now show the primary entry first, and a newly set primary slides to the top of the list instead of jumping. The slide is skipped under `prefers-reduced-motion`.
diff --git a/packages/ui/src/mosaic/features/user-profile/__tests__/user-profile-contact-list-row.view.test.tsx b/packages/ui/src/mosaic/features/user-profile/__tests__/user-profile-contact-list-row.view.test.tsx
index 96b6cff6372..b4d284c2ebd 100644
--- a/packages/ui/src/mosaic/features/user-profile/__tests__/user-profile-contact-list-row.view.test.tsx
+++ b/packages/ui/src/mosaic/features/user-profile/__tests__/user-profile-contact-list-row.view.test.tsx
@@ -5,6 +5,23 @@ import { describe, expect, it, vi } from 'vitest';
 import { UserProfileContactListRowView } from '../user-profile-account-section/user-profile-contact-list-row.view';
 
 describe('UserProfileContactListRowView', () => {
+  it('lists the primary item first, keeping the rest in the given order', () => {
+    render(
+      <UserProfileContactListRowView
+        kind='phone'
+        label='Phones'
+        items={[
+          { id: 'contact_1', value: 'First' },
+          { id: 'contact_2', value: 'Second', isDefault: true },
+          { id: 'contact_3', value: 'Third' },
+        ]}
+      />,
+    );
+
+    const values = screen.getAllByText(/^(First|Second|Third)$/).map(element => element.textContent);
+    expect(values).toEqual(['Second', 'First', 'Third']);
+  });
+
   it.each(['email', 'phone'] as const)('hides the menu when no %s action applies', kind => {
     const onVerify = vi.fn();
     const onSetPrimary = vi.fn();
diff --git a/packages/ui/src/mosaic/features/user-profile/user-profile-account-section/user-profile-contact-list-row.view.tsx b/packages/ui/src/mosaic/features/user-profile/user-profile-account-section/user-profile-contact-list-row.view.tsx
index ae602a53a95..ac448048c7f 100644
--- a/packages/ui/src/mosaic/features/user-profile/user-profile-account-section/user-profile-contact-list-row.view.tsx
+++ b/packages/ui/src/mosaic/features/user-profile/user-profile-account-section/user-profile-contact-list-row.view.tsx
@@ -4,6 +4,7 @@ import { Badge } from '../../../components/badge';
 import { Button } from '../../../components/button';
 import { Icon } from '../../../components/icon';
 import { Section } from '../../../components/section';
+import { useFlipReorder } from '../../../hooks/useFlipReorder';
 import type { UserProfileMenuAction } from '../user-profile-action-menu';
 import { UserProfileActionMenu } from '../user-profile-action-menu';
 import { styles } from '../user-profile-profile-panel.styles';
@@ -33,6 +34,8 @@ export function UserProfileContactListRowView({
   renderActionDialog,
 }: UserProfileContactListRowViewProps) {
   const emptyDescription = m[kind].empty;
+  const orderedItems = [...items.filter(item => item.isDefault), ...items.filter(item => !item.isDefault)];
+  const itemsRef = useFlipReorder<HTMLDivElement>(orderedItems.map(item => item.id));
 
   return (
     <Section.Row>
@@ -61,7 +64,7 @@ export function UserProfileContactListRowView({
           </Section.Actions>
         ) : null}
       </Section.Item>
-      <Section.Items>
+      <Section.Items ref={itemsRef}>
         {items.length === 0 ? (
           <Section.Item>
             <Section.Content>
@@ -69,7 +72,7 @@ export function UserProfileContactListRowView({
             </Section.Content>
           </Section.Item>
         ) : (
-          items.map(item => {
+          orderedItems.map(item => {
             const actions: UserProfileMenuAction[] = [];
 
             if (item.isVerified === false && onVerify) {
diff --git a/packages/ui/src/mosaic/hooks/__tests__/useFlipReorder.test.tsx b/packages/ui/src/mosaic/hooks/__tests__/useFlipReorder.test.tsx
new file mode 100644
index 00000000000..2f9606676b0
--- /dev/null
+++ b/packages/ui/src/mosaic/hooks/__tests__/useFlipReorder.test.tsx
@@ -0,0 +1,125 @@
+import { render, screen } from '@testing-library/react';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { durationVars, easingVars } from '../../tokens.stylex';
+import { useFlipReorder } from '../useFlipReorder';
+
+const ROW_HEIGHT = 40;
+const EASING = 'cubic-bezier(0.1, 0.2, 0.3, 1)';
+
+function List({ order }: { order: string[] }) {
+  const ref = useFlipReorder<HTMLUListElement>(order);
+  return (
+    <ul
+      ref={ref}
+      data-testid='list'
+    >
+      {order.map(id => (
+        <li
+          key={id}
+          data-testid={id}
+        >
+          {id}
+        </li>
+      ))}
+    </ul>
+  );
+}
+
+function customPropertyName(reference: string) {
+  const name = reference.match(/^var\((--[\w-]+)\)$/)?.[1];
+  if (!name) {
+    throw new Error(`Not a token reference: ${reference}`);
+  }
+  return name;
+}
+
+function defineTokens(element: HTMLElement) {
+  element.style.setProperty(customPropertyName(durationVars['--cl-duration-slow']), '0.25s');
+  element.style.setProperty(customPropertyName(easingVars['--cl-ease-enter']), EASING);
+}
+
+describe('useFlipReorder', () => {
+  const originalRect = Element.prototype.getBoundingClientRect;
+  const originalMatchMedia = window.matchMedia;
+  let animate: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    animate = vi.spyOn(HTMLElement.prototype, 'animate');
+    Element.prototype.getBoundingClientRect = function () {
+      const index = this.parentElement ? Array.from(this.parentElement.children).indexOf(this) : 0;
+      const top = index * ROW_HEIGHT;
+      return {
+        top,
+        left: 0,
+        bottom: top + ROW_HEIGHT,
+        right: 100,
+        width: 100,
+        height: ROW_HEIGHT,
+        x: 0,
+        y: top,
+        toJSON: () => ({}),
+      };
+    };
+  });
+
+  afterEach(() => {
+    animate.mockRestore();
+    Element.prototype.getBoundingClientRect = originalRect;
+    window.matchMedia = originalMatchMedia;
+  });
+
+  it('animates moved children from their old position at the Mosaic duration and easing', () => {
+    const { rerender } = render(<List order={['a', 'b', 'c']} />);
+    defineTokens(screen.getByTestId('list'));
+    rerender(<List order={['c', 'a', 'b']} />);
+
+    expect(animate).toHaveBeenCalledTimes(3);
+    const options = { duration: 250, easing: EASING };
+    expect(animate.mock.instances[0]).toBe(screen.getByTestId('c'));
+    expect(animate).toHaveBeenNthCalledWith(
+      1,
+      [{ transform: `translate(0px, ${2 * ROW_HEIGHT}px)` }, { transform: 'none' }],
+      options,
+    );
+    expect(animate.mock.instances[1]).toBe(screen.getByTestId('a'));
+    expect(animate).toHaveBeenNthCalledWith(
+      2,
+      [{ transform: `translate(0px, ${-ROW_HEIGHT}px)` }, { transform: 'none' }],
+      options,
+    );
+    expect(animate.mock.instances[2]).toBe(screen.getByTestId('b'));
+  });
+
+  it('leaves children alone when the order is unchanged or they are new', () => {
+    const { rerender } = render(<List order={['a', 'b']} />);
+    defineTokens(screen.getByTestId('list'));
+    rerender(<List order={['a', 'b']} />);
+    rerender(<List order={['a', 'b', 'c']} />);
+
+    expect(animate).not.toHaveBeenCalled();
+  });
+
+  it('does not animate under prefers-reduced-motion', () => {
+    window.matchMedia = vi.fn().mockImplementation((query: string) => ({
+      matches: query === '(prefers-reduced-motion: reduce)',
+      media: query,
+      onchange: null,
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+      dispatchEvent: vi.fn(),
+    }));
+    const { rerender } = render(<List order={['a', 'b']} />);
+    defineTokens(screen.getByTestId('list'));
+    rerender(<List order={['b', 'a']} />);
+
+    expect(animate).not.toHaveBeenCalled();
+  });
+
+  it('does not animate when the motion tokens are not defined', () => {
+    const { rerender } = render(<List order={['a', 'b']} />);
+    rerender(<List order={['b', 'a']} />);
+
+    expect(animate).not.toHaveBeenCalled();
+  });
+});
diff --git a/packages/ui/src/mosaic/hooks/useFlipReorder.ts b/packages/ui/src/mosaic/hooks/useFlipReorder.ts
new file mode 100644
index 00000000000..fccb8d9c4d2
--- /dev/null
+++ b/packages/ui/src/mosaic/hooks/useFlipReorder.ts
@@ -0,0 +1,93 @@
+import { useSafeLayoutEffect } from '@clerk/shared/react';
+import { useRef } from 'react';
+
+import { durationVars, easingVars } from '../tokens.stylex';
+
+const DURATION = durationVars['--cl-duration-slow'];
+const EASING = easingVars['--cl-ease-enter'];
+
+function measureChildren(container: HTMLElement | null) {
+  const rects = new Map<Element, DOMRect>();
+  if (container) {
+    for (const child of Array.from(container.children)) {
+      rects.set(child, child.getBoundingClientRect());
+    }
+  }
+  return rects;
+}
+
+function readToken(element: Element, reference: string) {
+  const name = reference.match(/^var\((--[\w-]+)\)$/)?.[1];
+  return name ? getComputedStyle(element).getPropertyValue(name).trim() : '';
+}
+
+function toMilliseconds(time: string) {
+  if (time.endsWith('ms')) {
+    return Number.parseFloat(time);
+  }
+  if (time.endsWith('s')) {
+    return Number.parseFloat(time) * 1000;
+  }
+  return Number.NaN;
+}
+
+/**
+ * Slides a container's children from their old position to their new one whenever `order` changes
+ * (a FLIP animation). Attach the returned ref to the container. Keyed children keep their DOM
+ * nodes across a reorder, so each node's rect is read before the commit and again after it, and the
+ * difference plays as a Web Animations API `transform` animation at the Mosaic `slow` duration and
+ * `enter` easing, read from the container's computed style. Skipped under `prefers-reduced-motion`.
+ */
+export function useFlipReorder<T extends HTMLElement>(order: readonly string[]) {
+  const ref = useRef<T>(null);
+  const key = JSON.stringify(order);
+  const renderedKey = useRef(key);
+  const before = useRef<Map<Element, DOMRect> | null>(null);
+
+  if (key !== renderedKey.current) {
+    renderedKey.current = key;
+    before.current = measureChildren(ref.current);
+  }
+
+  useSafeLayoutEffect(() => {
+    const snapshot = before.current;
+    const container = ref.current;
+    before.current = null;
+    if (!snapshot || !container || window.matchMedia('(prefers-reduced-motion: reduce)').matches) {
+      return undefined;
+    }
+
+    const moves: Array<{ child: HTMLElement; x: number; y: number }> = [];
+    for (const child of Array.from(container.children)) {
+      const first = snapshot.get(child);
+      if (!first || !(child instanceof HTMLElement)) {
+        continue;
+      }
+      const last = child.getBoundingClientRect();
+      const x = first.left - last.left;
+      const y = first.top - last.top;
+      if (x !== 0 || y !== 0) {
+        moves.push({ child, x, y });
+      }
+    }
+    if (moves.length === 0) {
+      return undefined;
+    }
+    const duration = toMilliseconds(readToken(container, DURATION));
+    const easing = readToken(container, EASING);
+    if (!(duration > 0) || !easing) {
+      return undefined;
+    }
+
+    const animations = moves.map(({ child, x, y }) =>
+      child.animate([{ transform: `translate(${x}px, ${y}px)` }, { transform: 'none' }], { duration, easing }),
+    );
+    return () => {
+      for (const animation of animations) {
+        animation.cancel();
+      }
+    };
+  }, [key]);
+
+  return ref;
+}