diff --git a/apps/design_system_gallery/lib/components/badge/stream_badge_count.dart b/apps/design_system_gallery/lib/components/badge/stream_badge_count.dart
index cad714e..9220cfd 100644
--- a/apps/design_system_gallery/lib/components/badge/stream_badge_count.dart
+++ b/apps/design_system_gallery/lib/components/badge/stream_badge_count.dart
@@ -141,6 +141,7 @@ class _SizeDemo extends StatelessWidget {
       StreamBadgeCountSize.xs => '20px',
       StreamBadgeCountSize.sm => '24px',
       StreamBadgeCountSize.md => '32px',
+      StreamBadgeCountSize.lg => '40px',
     };
   }
 
diff --git a/packages/stream_core_flutter/lib/src/components/avatar/stream_avatar_group.dart b/packages/stream_core_flutter/lib/src/components/avatar/stream_avatar_group.dart
index bc1d4a0..9f66a03 100644
--- a/packages/stream_core_flutter/lib/src/components/avatar/stream_avatar_group.dart
+++ b/packages/stream_core_flutter/lib/src/components/avatar/stream_avatar_group.dart
@@ -358,20 +358,18 @@ class DefaultStreamAvatarGroup extends StatelessWidget {
   }
 
   // Returns the appropriate avatar size for the given group size.
-  StreamAvatarSize _avatarSizeForGroupSize(
-    StreamAvatarGroupSize size,
-  ) => switch (size) {
+  StreamAvatarSize _avatarSizeForGroupSize(StreamAvatarGroupSize size) => switch (size) {
     .lg => StreamAvatarSize.sm,
     .xl => StreamAvatarSize.md,
-    .xxl => StreamAvatarSize.lg,
+    .xxl => StreamAvatarSize.xl,
   };
 
   // Returns the appropriate badge count size for the given group size.
   StreamBadgeCountSize _badgeCountSizeForGroupSize(
     StreamAvatarGroupSize size,
   ) => switch (size) {
-    .lg => StreamBadgeCountSize.sm,
-    .xl => StreamBadgeCountSize.md,
-    .xxl => StreamBadgeCountSize.md,
+    .lg => StreamBadgeCountSize.xs,
+    .xl => StreamBadgeCountSize.sm,
+    .xxl => StreamBadgeCountSize.lg,
   };
 }
diff --git a/packages/stream_core_flutter/lib/src/components/badge/stream_badge_count.dart b/packages/stream_core_flutter/lib/src/components/badge/stream_badge_count.dart
index 76bd76c..e783f96 100644
--- a/packages/stream_core_flutter/lib/src/components/badge/stream_badge_count.dart
+++ b/packages/stream_core_flutter/lib/src/components/badge/stream_badge_count.dart
@@ -184,7 +184,7 @@ class DefaultStreamBadgeCount extends StatelessWidget {
     StreamTextTheme textTheme,
   ) => switch (size) {
     .xs => textTheme.numericMd,
-    .sm || .md => textTheme.numericXl,
+    .sm || .md || .lg => textTheme.numericXl,
   };
 
   // Returns the appropriate padding for the given badge size.
@@ -194,6 +194,7 @@ class DefaultStreamBadgeCount extends StatelessWidget {
   ) => switch (size) {
     .xs => .symmetric(horizontal: spacing.xxs),
     .sm || .md => .symmetric(horizontal: spacing.xs),
+    .lg => .symmetric(horizontal: spacing.sm),
   };
 }
 
@@ -215,7 +216,7 @@ class _StreamBadgeCountThemeDefaults extends StreamBadgeCountThemeData {
   StreamBadgeCountSize get size => StreamBadgeCountSize.xs;
 
   @override
-  Color get backgroundColor => _colorScheme.backgroundApp;
+  Color get backgroundColor => _colorScheme.backgroundElevation3;
 
   @override
   Color get borderColor => _colorScheme.borderSubtle;
diff --git a/packages/stream_core_flutter/lib/src/theme/components/stream_badge_count_theme.dart b/packages/stream_core_flutter/lib/src/theme/components/stream_badge_count_theme.dart
index bba210c..2c7f295 100644
--- a/packages/stream_core_flutter/lib/src/theme/components/stream_badge_count_theme.dart
+++ b/packages/stream_core_flutter/lib/src/theme/components/stream_badge_count_theme.dart
@@ -21,7 +21,10 @@ enum StreamBadgeCountSize {
   sm(24),
 
   /// Medium badge (32px height).
-  md(32)
+  md(32),
+
+  /// Large badge (40px height).
+  lg(40)
   ;
 
   /// Constructs a [StreamBadgeCountSize] with the given height.