diff --git a/src/components-examples/aria/simple-combobox/simple-combobox-auto-select/simple-combobox-auto-select-example.html b/src/components-examples/aria/simple-combobox/simple-combobox-auto-select/simple-combobox-auto-select-example.html
index a7e0c22c28ba..a7738807637c 100644
--- a/src/components-examples/aria/simple-combobox/simple-combobox-auto-select/simple-combobox-auto-select-example.html
+++ b/src/components-examples/aria/simple-combobox/simple-combobox-auto-select/simple-combobox-auto-select-example.html
@@ -5,18 +5,28 @@
       [(value)]="searchString" [(expanded)]="popupExpanded" (click)="popupExpanded.set(true)" />
   </div>
 
+  <div aria-live="polite" class="cdk-visually-hidden">
+    {{options().length === 0 ? 'No results found for ' + searchString() : ''}}
+  </div>
+
   <ng-template [cdkConnectedOverlay]="{origin, usePopover: 'inline', matchWidth: true}" [cdkConnectedOverlayOpen]="true"
     [cdkConnectedOverlayDisableClose]="true">
     <ng-template ngComboboxPopup [combobox]="combobox">
-      <div #listbox="ngListbox" ngListbox ngComboboxWidget class="example-listbox example-popup" focusMode="activedescendant"
+      <div class="example-popup">
+        @if (options().length === 0) {
+        <div class="example-no-results">No results found</div>
+        }
+        <div #listbox="ngListbox" ngListbox ngComboboxWidget class="example-listbox" focusMode="activedescendant"
         [tabindex]="-1" [(value)]="selectedOption" (click)="onCommit()" (keydown.enter)="onCommit()"
-        [activeDescendant]="listbox.activeDescendant()">
+        [activeDescendant]="listbox.activeDescendant()"
+        [class.example-empty]="options().length === 0">
         @for (option of options(); track option) {
         <div class="example-option example-selectable example-stateful" ngOption [value]="option" [label]="option">
           <span>{{option}}</span>
           <span aria-hidden="true" class="material-symbols-outlined example-icon example-selected-icon">check</span>
         </div>
         }
+        </div>
       </div>
     </ng-template>
   </ng-template>
diff --git a/src/components-examples/aria/simple-combobox/simple-combobox-dialog/simple-combobox-dialog-example.html b/src/components-examples/aria/simple-combobox/simple-combobox-dialog/simple-combobox-dialog-example.html
index 5bcfc7a3efca..5c2e125c6a08 100644
--- a/src/components-examples/aria/simple-combobox/simple-combobox-dialog/simple-combobox-dialog-example.html
+++ b/src/components-examples/aria/simple-combobox/simple-combobox-dialog/simple-combobox-dialog-example.html
@@ -18,18 +18,29 @@
                 placeholder="Search..." [(ngModel)]="searchString" [alwaysExpanded]="true"
                 (keydown.escape)="onSearchEscape($event)" />
             </div>
+
+            <div aria-live="polite" class="cdk-visually-hidden">
+              {{options().length === 0 ? 'No results found for ' + searchString() : ''}}
+            </div>
+
             <ng-template ngComboboxPopup [combobox]="innerCombobox">
-              <div #listbox="ngListbox" ngListbox ngComboboxWidget class="example-listbox" focusMode="activedescendant"
-                tabindex="-1" selectionMode="explicit" [(value)]="selectedStates" (click)="onCommit()"
-                (keydown.enter)="onCommit()" [activeDescendant]="listbox.activeDescendant()">
-                @for (option of options(); track option) {
-                <div class="example-option example-selectable example-stateful" ngOption [value]="option"
-                  [label]="option">
-                  <span>{{option}}</span>
-                  <span aria-hidden="true"
-                    class="material-symbols-outlined example-icon example-selected-icon">check</span>
-                </div>
+              <div class="example-popup example-popup-no-margin">
+                @if (options().length === 0) {
+                <div class="example-no-results">No results found</div>
                 }
+                <div #listbox="ngListbox" ngListbox ngComboboxWidget class="example-listbox" focusMode="activedescendant"
+                  tabindex="-1" selectionMode="explicit" [(value)]="selectedStates" (click)="onCommit()"
+                  (keydown.enter)="onCommit()" [activeDescendant]="listbox.activeDescendant()"
+                  [class.example-empty]="options().length === 0">
+                  @for (option of options(); track option) {
+                  <div class="example-option example-selectable example-stateful" ngOption [value]="option"
+                    [label]="option">
+                    <span>{{option}}</span>
+                    <span aria-hidden="true"
+                      class="material-symbols-outlined example-icon example-selected-icon">check</span>
+                  </div>
+                  }
+                </div>
               </div>
             </ng-template>
           </div>
diff --git a/src/components-examples/aria/simple-combobox/simple-combobox-example.css b/src/components-examples/aria/simple-combobox/simple-combobox-example.css
index 6f239afd12e3..4bcf3d08001f 100644
--- a/src/components-examples/aria/simple-combobox/simple-combobox-example.css
+++ b/src/components-examples/aria/simple-combobox/simple-combobox-example.css
@@ -360,3 +360,20 @@ ul[role='group'] {
 .example-grid-row[aria-selected='true'] .example-selected-icon {
   visibility: visible;
 }
+
+.example-no-results {
+  padding: 1rem;
+}
+
+.example-empty {
+  position: absolute;
+  visibility: hidden;
+  pointer-events: none;
+  height: 0;
+  width: 0;
+  overflow: hidden;
+}
+
+.example-popup-no-margin {
+  margin-block-start: 0;
+}
diff --git a/src/components-examples/aria/simple-combobox/simple-combobox-grid/simple-combobox-grid-example.html b/src/components-examples/aria/simple-combobox/simple-combobox-grid/simple-combobox-grid-example.html
index 034d76666689..6117c726005e 100644
--- a/src/components-examples/aria/simple-combobox/simple-combobox-grid/simple-combobox-grid-example.html
+++ b/src/components-examples/aria/simple-combobox/simple-combobox-grid/simple-combobox-grid-example.html
@@ -5,29 +5,38 @@
       [(value)]="searchString" [(expanded)]="popupExpanded" (blur)="onBlur()" (click)="popupExpanded.set(true)" />
   </div>
 
+  <div aria-live="polite" class="cdk-visually-hidden">
+    {{filteredItems().length === 0 ? 'No results found for ' + searchString() : ''}}
+  </div>
+
   <ng-template [cdkConnectedOverlay]="{origin, usePopover: 'inline', matchWidth: true}" [cdkConnectedOverlayOpen]="true"
     [cdkConnectedOverlayDisableClose]="true">
     <ng-template ngComboboxPopup [combobox]="combobox">
-      <div ngComboboxWidget ngGrid focusMode="activedescendant" [tabindex]="-1" class="example-popup"
-        colWrap="continuous" #grid="ngGrid" [activeDescendant]="grid.activeDescendant()">
-        @for (item of filteredItems(); track item.label; let i = $index) {
-        <div ngGridRow class="example-grid-row" [attr.aria-selected]="item === selectedItem()">
-          <div ngGridCell [id]="item.label + '-label'" [rowIndex]="i" [colIndex]="0"
-            class="example-cell-label example-cell" (activated)="selectItem(item)">
-            <button ngGridCellWidget class="example-label-button example-no-active-outline" (click)="selectItem(item)">
-              {{item.label}}
-            </button>
-            <mat-icon class="example-selected-icon">check</mat-icon>
-          </div>
-          <div ngGridCell [id]="item.label + '-delete'" [rowIndex]="i" [colIndex]="1"
-            class="example-cell-button example-cell " (activated)="removeItem(item)">
-            <button ngGridCellWidget class="example-button example-no-active-outline" (click)="removeItem(item)"
-              (pointerdown)="$event.preventDefault()">
-              <mat-icon>close</mat-icon>
-            </button>
+      <div class="example-popup">
+        @if (filteredItems().length === 0) {
+        <div class="example-no-results">No results found</div>
+        }
+        <div ngComboboxWidget ngGrid focusMode="activedescendant" [tabindex]="-1"
+          colWrap="continuous" #grid="ngGrid" [activeDescendant]="grid.activeDescendant()">
+          @for (item of filteredItems(); track item.label; let i = $index) {
+          <div ngGridRow class="example-grid-row" [attr.aria-selected]="item === selectedItem()">
+            <div ngGridCell [id]="item.label + '-label'" [rowIndex]="i" [colIndex]="0"
+              class="example-cell-label example-cell" (activated)="selectItem(item)">
+              <button ngGridCellWidget class="example-label-button example-no-active-outline" (click)="selectItem(item)">
+                {{item.label}}
+              </button>
+              <mat-icon class="example-selected-icon">check</mat-icon>
+            </div>
+            <div ngGridCell [id]="item.label + '-delete'" [rowIndex]="i" [colIndex]="1"
+              class="example-cell-button example-cell " (activated)="removeItem(item)">
+              <button ngGridCellWidget class="example-button example-no-active-outline" (click)="removeItem(item)"
+                (pointerdown)="$event.preventDefault()">
+                <mat-icon>close</mat-icon>
+              </button>
+            </div>
           </div>
+          }
         </div>
-        }
       </div>
     </ng-template>
   </ng-template>
diff --git a/src/components-examples/aria/simple-combobox/simple-combobox-highlight/simple-combobox-highlight-example.html b/src/components-examples/aria/simple-combobox/simple-combobox-highlight/simple-combobox-highlight-example.html
index ca2fcde09a78..976a311321ca 100644
--- a/src/components-examples/aria/simple-combobox/simple-combobox-highlight/simple-combobox-highlight-example.html
+++ b/src/components-examples/aria/simple-combobox/simple-combobox-highlight/simple-combobox-highlight-example.html
@@ -7,19 +7,29 @@
       [inlineSuggestion]="(searchString() || navigated()) ? selectedOption()[0] : undefined" />
   </div>
 
+  <div aria-live="polite" class="cdk-visually-hidden">
+    {{options().length === 0 ? 'No results found for ' + searchString() : ''}}
+  </div>
+
   <ng-template [cdkConnectedOverlay]="{origin, usePopover: 'inline', matchWidth: true}" [cdkConnectedOverlayOpen]="true"
     [cdkConnectedOverlayDisableClose]="true">
     <ng-template ngComboboxPopup [combobox]="combobox">
-      <div #listbox="ngListbox" ngListbox ngComboboxWidget class="example-listbox example-popup"
-        focusMode="activedescendant" [tabindex]="-1" [(value)]="selectedOption" (click)="onCommit()"
-        (keydown.enter)="onCommit()" [activeDescendant]="listbox.activeDescendant()">
-        @for (option of options(); track option.name) {
-        <div class="example-option example-selectable example-stateful" ngOption [value]="option.name"
-          [label]="option.name" [disabled]="option.disabled">
-          <span>{{option.name}}</span>
-          <span aria-hidden="true" class="material-symbols-outlined example-icon example-selected-icon">check</span>
-        </div>
+      <div class="example-popup">
+        @if (options().length === 0) {
+        <div class="example-no-results">No results found</div>
         }
+        <div #listbox="ngListbox" ngListbox ngComboboxWidget class="example-listbox"
+          focusMode="activedescendant" [tabindex]="-1" [(value)]="selectedOption" (click)="onCommit()"
+          (keydown.enter)="onCommit()" [activeDescendant]="listbox.activeDescendant()"
+          [class.example-empty]="options().length === 0">
+          @for (option of options(); track option.name) {
+          <div class="example-option example-selectable example-stateful" ngOption [value]="option.name"
+            [label]="option.name" [disabled]="option.disabled">
+            <span>{{option.name}}</span>
+            <span aria-hidden="true" class="material-symbols-outlined example-icon example-selected-icon">check</span>
+          </div>
+          }
+        </div>
       </div>
     </ng-template>
   </ng-template>
diff --git a/src/components-examples/aria/simple-combobox/simple-combobox-listbox/simple-combobox-listbox-example.html b/src/components-examples/aria/simple-combobox/simple-combobox-listbox/simple-combobox-listbox-example.html
index b92662e2879c..68b91cd0d207 100644
--- a/src/components-examples/aria/simple-combobox/simple-combobox-listbox/simple-combobox-listbox-example.html
+++ b/src/components-examples/aria/simple-combobox/simple-combobox-listbox/simple-combobox-listbox-example.html
@@ -5,18 +5,28 @@
       [(value)]="searchString" [(expanded)]="popupExpanded" (click)="popupExpanded.set(true)" />
   </div>
 
+  <div aria-live="polite" class="cdk-visually-hidden">
+    {{options().length === 0 ? 'No results found for ' + searchString() : ''}}
+  </div>
+
   <ng-template [cdkConnectedOverlay]="{origin, usePopover: 'inline', matchWidth: true}" [cdkConnectedOverlayOpen]="true"
     [cdkConnectedOverlayDisableClose]="true">
     <ng-template ngComboboxPopup [combobox]="combobox">
-      <div #listbox="ngListbox" ngListbox ngComboboxWidget class="example-listbox example-popup" focusMode="activedescendant"
-        [tabindex]="-1" selectionMode="explicit" [(value)]="selectedOption" (click)="onCommit()"
-        (keydown.enter)="onCommit()" [activeDescendant]="listbox.activeDescendant()">
-        @for (option of options(); track option) {
-        <div class="example-option example-selectable example-stateful" ngOption [value]="option" [label]="option">
-          <span>{{option}}</span>
-          <span aria-hidden="true" class="material-symbols-outlined example-icon example-selected-icon">check</span>
-        </div>
+      <div class="example-popup">
+        @if (options().length === 0) {
+        <div class="example-no-results">No results found</div>
         }
+        <div #listbox="ngListbox" ngListbox ngComboboxWidget class="example-listbox" focusMode="activedescendant"
+          [tabindex]="-1" selectionMode="explicit" [(value)]="selectedOption" (click)="onCommit()"
+          (keydown.enter)="onCommit()" [activeDescendant]="listbox.activeDescendant()"
+          [class.example-empty]="options().length === 0">
+          @for (option of options(); track option) {
+          <div class="example-option example-selectable example-stateful" ngOption [value]="option" [label]="option">
+            <span>{{option}}</span>
+            <span aria-hidden="true" class="material-symbols-outlined example-icon example-selected-icon">check</span>
+          </div>
+          }
+        </div>
       </div>
     </ng-template>
   </ng-template>
diff --git a/src/components-examples/aria/simple-combobox/simple-combobox-tree-auto-select/simple-combobox-tree-auto-select-example.html b/src/components-examples/aria/simple-combobox/simple-combobox-tree-auto-select/simple-combobox-tree-auto-select-example.html
index cf450a7a3ac0..fc50a3d48883 100644
--- a/src/components-examples/aria/simple-combobox/simple-combobox-tree-auto-select/simple-combobox-tree-auto-select-example.html
+++ b/src/components-examples/aria/simple-combobox/simple-combobox-tree-auto-select/simple-combobox-tree-auto-select-example.html
@@ -5,15 +5,25 @@
       [(value)]="searchString" [(expanded)]="popupExpanded" (click)="popupExpanded.set(true)" />
   </div>
 
+  <div aria-live="polite" class="cdk-visually-hidden">
+    {{filteredGroups().length === 0 ? 'No results found for ' + searchString() : ''}}
+  </div>
+
   <ng-template [cdkConnectedOverlay]="{origin, usePopover: 'inline', matchWidth: true}"
     [cdkConnectedOverlayOpen]="popupExpanded()" [cdkConnectedOverlayDisableClose]="true">
     <ng-template ngComboboxPopup [combobox]="combobox" popupType="tree">
-      <ul ngTree ngComboboxWidget class="example-tree example-popup" focusMode="activedescendant" [tabindex]="-1"
-        selectionMode="follow" [(value)]="selectedValues" (click)="onCommit()" (keydown.enter)="onCommit()"
-        #tree="ngTree" [activeDescendant]="tree.activeDescendant()">
-        <ng-template [ngTemplateOutlet]="treeNodes"
-          [ngTemplateOutletContext]="{nodes: filteredGroups(), parent: tree}" />
-      </ul>
+      <div class="example-popup">
+        @if (filteredGroups().length === 0) {
+        <div class="example-no-results">No results found</div>
+        }
+        <ul ngTree ngComboboxWidget class="example-tree" focusMode="activedescendant" [tabindex="-1"
+          selectionMode="follow" [(value)]="selectedValues" (click)="onCommit()" (keydown.enter)="onCommit()"
+          #tree="ngTree" [activeDescendant]="tree.activeDescendant()"
+          [class.example-empty]="filteredGroups().length === 0">
+          <ng-template [ngTemplateOutlet]="treeNodes"
+            [ngTemplateOutletContext]="{nodes: filteredGroups(), parent: tree}" />
+        </ul>
+      </div>
     </ng-template>
   </ng-template>
 </div>
diff --git a/src/components-examples/aria/simple-combobox/simple-combobox-tree-highlight/simple-combobox-tree-highlight-example.html b/src/components-examples/aria/simple-combobox/simple-combobox-tree-highlight/simple-combobox-tree-highlight-example.html
index 8fdc99de79b6..e7fd0db9890e 100644
--- a/src/components-examples/aria/simple-combobox/simple-combobox-tree-highlight/simple-combobox-tree-highlight-example.html
+++ b/src/components-examples/aria/simple-combobox/simple-combobox-tree-highlight/simple-combobox-tree-highlight-example.html
@@ -7,15 +7,25 @@
       [inlineSuggestion]="(searchString() || navigated()) ? selectedValues()[0] : undefined" />
   </div>
 
+  <div aria-live="polite" class="cdk-visually-hidden">
+    {{filteredGroups().length === 0 ? 'No results found for ' + searchString() : ''}}
+  </div>
+
   <ng-template [cdkConnectedOverlay]="{origin, usePopover: 'inline', matchWidth: true}" [cdkConnectedOverlayOpen]="true"
     [cdkConnectedOverlayDisableClose]="true">
     <ng-template ngComboboxPopup [combobox]="combobox" popupType="tree">
-      <ul ngTree ngComboboxWidget class="example-tree example-popup" focusMode="activedescendant" [tabindex]="-1"
-        selectionMode="follow" [(value)]="selectedValues" (click)="onCommit()" (keydown.enter)="onCommit()"
-        #tree="ngTree" [activeDescendant]="tree.activeDescendant()">
-        <ng-template [ngTemplateOutlet]="treeNodes"
-          [ngTemplateOutletContext]="{nodes: filteredGroups(), parent: tree}" />
-      </ul>
+      <div class="example-popup">
+        @if (filteredGroups().length === 0) {
+        <div class="example-no-results">No results found</div>
+        }
+        <ul ngTree ngComboboxWidget class="example-tree" focusMode="activedescendant" [tabindex]="-1"
+          selectionMode="follow" [(value)]="selectedValues" (click)="onCommit()" (keydown.enter)="onCommit()"
+          #tree="ngTree" [activeDescendant]="tree.activeDescendant()"
+          [class.example-empty]="filteredGroups().length === 0">
+          <ng-template [ngTemplateOutlet]="treeNodes"
+            [ngTemplateOutletContext]="{nodes: filteredGroups(), parent: tree}" />
+        </ul>
+      </div>
     </ng-template>
   </ng-template>
 </div>
diff --git a/src/components-examples/aria/simple-combobox/simple-combobox-tree/simple-combobox-tree-example.html b/src/components-examples/aria/simple-combobox/simple-combobox-tree/simple-combobox-tree-example.html
index 16e41d50a106..4e0afa6015fe 100644
--- a/src/components-examples/aria/simple-combobox/simple-combobox-tree/simple-combobox-tree-example.html
+++ b/src/components-examples/aria/simple-combobox/simple-combobox-tree/simple-combobox-tree-example.html
@@ -5,14 +5,24 @@
       [(expanded)]="popupExpanded" (click)="popupExpanded.set(true)" />
   </div>
 
+  <div aria-live="polite" class="cdk-visually-hidden">
+    {{filteredGroups().length === 0 ? 'No results found for ' + searchString() : ''}}
+  </div>
+
   <ng-template [cdkConnectedOverlay]="{origin, usePopover: 'inline', matchWidth: true}"
     [cdkConnectedOverlayOpen]="popupExpanded()" [cdkConnectedOverlayDisableClose]="true">
     <ng-template ngComboboxPopup [combobox]="combobox" popupType="tree">
-      <ul ngTree ngComboboxWidget class="example-tree example-popup" focusMode="activedescendant" [tabindex]="-1"
-        selectionMode="explicit" [(value)]="selectedValues" (click)="onCommit()" (keydown.enter)="onCommit()" #tree="ngTree"
-        [activeDescendant]="tree.activeDescendant()">
-        <ng-template [ngTemplateOutlet]="treeNodes" [ngTemplateOutletContext]="{nodes: filteredGroups(), parent: tree}" />
-      </ul>
+      <div class="example-popup">
+        @if (filteredGroups().length === 0) {
+        <div class="example-no-results">No results found</div>
+        }
+        <ul ngTree ngComboboxWidget class="example-tree" focusMode="activedescendant" [tabindex]="-1"
+          selectionMode="explicit" [(value)]="selectedValues" (click)="onCommit()" (keydown.enter)="onCommit()" #tree="ngTree"
+          [activeDescendant]="tree.activeDescendant()"
+          [class.example-empty]="filteredGroups().length === 0">
+          <ng-template [ngTemplateOutlet]="treeNodes" [ngTemplateOutletContext]="{nodes: filteredGroups(), parent: tree}" />
+        </ul>
+      </div>
     </ng-template>
   </ng-template>
 </div>