diff --git a/packages/react/src/popover/root/PopoverRoot.tsx b/packages/react/src/popover/root/PopoverRoot.tsx
index d8ca74d9ae..190781098f 100644
--- a/packages/react/src/popover/root/PopoverRoot.tsx
+++ b/packages/react/src/popover/root/PopoverRoot.tsx
@@ -13,7 +13,7 @@ import { PortalContext } from '../../portal/PortalContext';
  * Documentation: [Base UI Popover](https://base-ui.com/react/components/popover)
  */
 const PopoverRoot: React.FC<PopoverRoot.Props> = function PopoverRoot(props) {
-  const { onOpenChange, openOnHover = false, delay, closeDelay = 0 } = props;
+  const { defaultOpen, open, onOpenChange, openOnHover = false, delay, closeDelay = 0 } = props;
 
   const delayWithDefault = delay ?? OPEN_DELAY;
 
@@ -66,6 +66,13 @@ PopoverRoot.propTypes /* remove-proptypes */ = {
    * @default 0
    */
   closeDelay: PropTypes.number,
+  /**
+   * Whether the popover is initially open.
+   *
+   * To render a controlled popover, use the `open` prop instead.
+   * @default false
+   */
+  defaultOpen: PropTypes.bool,
   /**
    * How long to wait before the popover may be opened on hover. Specified in milliseconds.
    *
@@ -77,6 +84,10 @@ PopoverRoot.propTypes /* remove-proptypes */ = {
    * Event handler called when the popover is opened or closed.
    */
   onOpenChange: PropTypes.func,
+  /**
+   * Whether the popover is currently open.
+   */
+  open: PropTypes.bool,
   /**
    * Whether the popover should also open when the trigger is hovered.
    * @default false
diff --git a/packages/react/src/preview-card/root/PreviewCardRoot.tsx b/packages/react/src/preview-card/root/PreviewCardRoot.tsx
index c385ee2416..23ca59e2bf 100644
--- a/packages/react/src/preview-card/root/PreviewCardRoot.tsx
+++ b/packages/react/src/preview-card/root/PreviewCardRoot.tsx
@@ -13,7 +13,7 @@ import { PortalContext } from '../../portal/PortalContext';
  * Documentation: [Base UI Preview Card](https://base-ui.com/react/components/preview-card)
  */
 const PreviewCardRoot: React.FC<PreviewCardRoot.Props> = function PreviewCardRoot(props) {
-  const { onOpenChange, delay, closeDelay } = props;
+  const { defaultOpen, open, onOpenChange, delay, closeDelay } = props;
 
   const delayWithDefault = delay ?? OPEN_DELAY;
   const closeDelayWithDefault = closeDelay ?? CLOSE_DELAY;
@@ -64,6 +64,13 @@ PreviewCardRoot.propTypes /* remove-proptypes */ = {
    * @default 300
    */
   closeDelay: PropTypes.number,
+  /**
+   * Whether the preview card is initially open.
+   *
+   * To render a controlled preview card, use the `open` prop instead.
+   * @default false
+   */
+  defaultOpen: PropTypes.bool,
   /**
    * How long to wait before the preview card opens. Specified in milliseconds.
    * @default 600
@@ -73,6 +80,10 @@ PreviewCardRoot.propTypes /* remove-proptypes */ = {
    * Event handler called when the preview card is opened or closed.
    */
   onOpenChange: PropTypes.func,
+  /**
+   * Whether the preview card is currently open.
+   */
+  open: PropTypes.bool,
 } as any;
 
 export { PreviewCardRoot };
diff --git a/packages/react/src/tooltip/root/TooltipRoot.tsx b/packages/react/src/tooltip/root/TooltipRoot.tsx
index 670e4c38ff..56c390b495 100644
--- a/packages/react/src/tooltip/root/TooltipRoot.tsx
+++ b/packages/react/src/tooltip/root/TooltipRoot.tsx
@@ -13,7 +13,15 @@ import { PortalContext } from '../../portal/PortalContext';
  * Documentation: [Base UI Tooltip](https://base-ui.com/react/components/tooltip)
  */
 const TooltipRoot: React.FC<TooltipRoot.Props> = function TooltipRoot(props) {
-  const { onOpenChange, delay, closeDelay, hoverable = true, trackCursorAxis = 'none' } = props;
+  const {
+    defaultOpen,
+    open,
+    onOpenChange,
+    delay,
+    closeDelay,
+    hoverable = true,
+    trackCursorAxis = 'none',
+  } = props;
 
   const delayWithDefault = delay ?? OPEN_DELAY;
   const closeDelayWithDefault = closeDelay ?? 0;
@@ -65,6 +73,13 @@ TooltipRoot.propTypes /* remove-proptypes */ = {
    * @default 0
    */
   closeDelay: PropTypes.number,
+  /**
+   * Whether the tooltip is initially open.
+   *
+   * To render a controlled tooltip, use the `open` prop instead.
+   * @default false
+   */
+  defaultOpen: PropTypes.bool,
   /**
    * How long to wait before opening the tooltip. Specified in milliseconds.
    * @default 600
@@ -79,6 +94,10 @@ TooltipRoot.propTypes /* remove-proptypes */ = {
    * Event handler called when the tooltip is opened or closed.
    */
   onOpenChange: PropTypes.func,
+  /**
+   * Whether the tooltip is currently open.
+   */
+  open: PropTypes.bool,
   /**
    * Determines which axis the tooltip should track the cursor on.
    * @default 'none'