diff --git a/src/actions/compose.ts b/src/actions/compose.ts
index 624d58ceef..eddd9ef7d2 100644
--- a/src/actions/compose.ts
+++ b/src/actions/compose.ts
@@ -152,9 +152,10 @@ interface ComposeReplyAction {
   account: Account;
   explicitAddressing: boolean;
   preserveSpoilers: boolean;
+  rebloggedBy?: Account;
 }
 
-const replyCompose = (status: Status) =>
+const replyCompose = (status: Status, rebloggedBy?: Account) =>
   (dispatch: AppDispatch, getState: () => RootState) => {
     const state = getState();
     const instance = state.instance;
@@ -171,6 +172,7 @@ const replyCompose = (status: Status) =>
       account,
       explicitAddressing,
       preserveSpoilers,
+      rebloggedBy: rebloggedBy,
     };
 
     dispatch(action);
diff --git a/src/components/status-action-bar.tsx b/src/components/status-action-bar.tsx
index f48151c3ef..0b12fe68ae 100644
--- a/src/components/status-action-bar.tsx
+++ b/src/components/status-action-bar.tsx
@@ -28,7 +28,7 @@ import { getReactForStatus, reduceEmoji } from 'soapbox/utils/emoji-reacts';
 import GroupPopover from './groups/popover/group-popover';
 
 import type { Menu } from 'soapbox/components/dropdown-menu';
-import type { Group, Status } from 'soapbox/types/entities';
+import type { Account, Group, Status } from 'soapbox/types/entities';
 
 const messages = defineMessages({
   adminAccount: { id: 'status.admin_account', defaultMessage: 'Moderate @{name}' },
@@ -99,6 +99,7 @@ const messages = defineMessages({
 
 interface IStatusActionBar {
   status: Status;
+  rebloggedBy?: Account;
   withLabels?: boolean;
   expandable?: boolean;
   space?: 'sm' | 'md' | 'lg';
@@ -113,6 +114,7 @@ const StatusActionBar: React.FC<IStatusActionBar> = ({
   space = 'sm',
   statusActionButtonTheme = 'default',
   fromBookmarks = false,
+  rebloggedBy,
 }) => {
   const intl = useIntl();
   const history = useHistory();
@@ -148,7 +150,7 @@ const StatusActionBar: React.FC<IStatusActionBar> = ({
 
   const handleReplyClick: React.MouseEventHandler = (e) => {
     if (me) {
-      dispatch(replyCompose(status));
+      dispatch(replyCompose(status, rebloggedBy));
     } else {
       onOpenUnauthorizedModal('REPLY');
     }
@@ -211,7 +213,7 @@ const StatusActionBar: React.FC<IStatusActionBar> = ({
   };
 
   const doDeleteStatus = (withRedraft = false) => {
-    dispatch((_, getState) => {
+    dispatch((_) => {
       if (!deleteModal) {
         dispatch(deleteStatus(status.id, withRedraft));
       } else {
diff --git a/src/components/status.tsx b/src/components/status.tsx
index a8f6f3b4c5..5bf5385767 100644
--- a/src/components/status.tsx
+++ b/src/components/status.tsx
@@ -138,7 +138,7 @@ const Status: React.FC<IStatus> = (props) => {
 
   const handleHotkeyReply = (e?: KeyboardEvent): void => {
     e?.preventDefault();
-    dispatch(replyCompose(actualStatus));
+    dispatch(replyCompose(actualStatus, status.reblog && typeof status.reblog === 'object' ? status.account : undefined));
   };
 
   const handleHotkeyFavourite = (): void => {
@@ -458,7 +458,7 @@ const Status: React.FC<IStatus> = (props) => {
 
             {!hideActionBar && (
               <div className='pt-4'>
-                <StatusActionBar status={actualStatus} fromBookmarks={fromBookmarks} />
+                <StatusActionBar status={actualStatus} rebloggedBy={isReblog ? status.account : undefined} fromBookmarks={fromBookmarks} />
               </div>
             )}
           </div>
diff --git a/src/features/compose/components/reply-mentions.tsx b/src/features/compose/components/reply-mentions.tsx
index 3fd1af36f2..1a6cbcd211 100644
--- a/src/features/compose/components/reply-mentions.tsx
+++ b/src/features/compose/components/reply-mentions.tsx
@@ -2,8 +2,7 @@ import React, { useCallback } from 'react';
 import { FormattedList, FormattedMessage } from 'react-intl';
 
 import { openModal } from 'soapbox/actions/modals';
-import { useAppDispatch, useAppSelector, useCompose, useFeatures, useOwnAccount } from 'soapbox/hooks';
-import { statusToMentionsAccountIdsArray } from 'soapbox/reducers/compose';
+import { useAppDispatch, useAppSelector, useCompose, useFeatures } from 'soapbox/hooks';
 import { makeGetStatus } from 'soapbox/selectors';
 
 import type { Status as StatusEntity } from 'soapbox/types/entities';
@@ -20,14 +19,11 @@ const ReplyMentions: React.FC<IReplyMentions> = ({ composeId }) => {
   const getStatus = useCallback(makeGetStatus(), []);
   const status = useAppSelector<StatusEntity | null>(state => getStatus(state, { id: compose.in_reply_to! }));
   const to = compose.to;
-  const { account } = useOwnAccount();
 
   if (!features.explicitAddressing || !status || !to) {
     return null;
   }
 
-  const parentTo = status && statusToMentionsAccountIdsArray(status, account!);
-
   const handleClick = (e: React.MouseEvent<HTMLAnchorElement>) => {
     e.preventDefault();
 
@@ -36,7 +32,7 @@ const ReplyMentions: React.FC<IReplyMentions> = ({ composeId }) => {
     }));
   };
 
-  if (!parentTo || (parentTo.size === 0)) {
+  if (!compose.parent_reblogged_by && to.size === 0) {
     return null;
   }
 
diff --git a/src/features/ui/components/modals/reply-mentions-modal.tsx b/src/features/ui/components/modals/reply-mentions-modal.tsx
index 386402078d..c24cf343cb 100644
--- a/src/features/ui/components/modals/reply-mentions-modal.tsx
+++ b/src/features/ui/components/modals/reply-mentions-modal.tsx
@@ -22,7 +22,7 @@ const ReplyMentionsModal: React.FC<IReplyMentionsModal> = ({ composeId, onClose
   const status = useAppSelector<StatusEntity | null>(state => getStatus(state, { id: compose.in_reply_to! }));
   const { account } = useOwnAccount();
 
-  const mentions = statusToMentionsAccountIdsArray(status!, account!);
+  const mentions = statusToMentionsAccountIdsArray(status!, account!, compose.parent_reblogged_by);
   const author = (status?.account as AccountEntity).id;
 
   const onClickClose = () => {
diff --git a/src/reducers/compose.ts b/src/reducers/compose.ts
index 5d8730ab90..559ddfcad9 100644
--- a/src/reducers/compose.ts
+++ b/src/reducers/compose.ts
@@ -108,6 +108,7 @@ export const ReducerCompose = ImmutableRecord({
   tagHistory: ImmutableList<string>(),
   text: '',
   to: ImmutableOrderedSet<string>(),
+  parent_reblogged_by: null as string | null,
 });
 
 type State = ImmutableMap<string, Compose>;
@@ -125,19 +126,21 @@ const statusToTextMentions = (status: Status, account: Account) => {
     .join('');
 };
 
-export const statusToMentionsArray = (status: Status, account: Account) => {
+export const statusToMentionsArray = (status: Status, account: Account, rebloggedBy?: Account) => {
   const author = status.getIn(['account', 'acct']) as string;
   const mentions = status.get('mentions')?.map((m) => m.acct) || [];
 
   return ImmutableOrderedSet<string>([author])
+    .concat(rebloggedBy ? [rebloggedBy.acct] : [])
     .concat(mentions)
     .delete(account.acct) as ImmutableOrderedSet<string>;
 };
 
-export const statusToMentionsAccountIdsArray = (status: StatusEntity, account: Account) => {
+export const statusToMentionsAccountIdsArray = (status: StatusEntity, account: Account, parentRebloggedBy?: string | null) => {
   const mentions = status.mentions.map((m) => m.id);
 
-  return ImmutableOrderedSet<string>([account.id])
+  return ImmutableOrderedSet<string>([status.account.id])
+    .concat(parentRebloggedBy ? [parentRebloggedBy] : [])
     .concat(mentions)
     .delete(account.id);
 };
@@ -306,9 +309,14 @@ export default function compose(state = initialState, action: ComposeAction | Ev
       return updateCompose(state, action.id, compose => compose.withMutations(map => {
         const defaultCompose = state.get('default')!;
 
+        const to = action.explicitAddressing
+          ? statusToMentionsArray(action.status, action.account, action.rebloggedBy)
+          : ImmutableOrderedSet<string>();
+
         map.set('group_id', action.status.getIn(['group', 'id']) as string);
         map.set('in_reply_to', action.status.get('id'));
-        map.set('to', action.explicitAddressing ? statusToMentionsArray(action.status, action.account) : ImmutableOrderedSet<string>());
+        map.set('to', to);
+        map.set('parent_reblogged_by', action.rebloggedBy?.id || null);
         map.set('text', !action.explicitAddressing ? statusToTextMentions(action.status, action.account) : '');
         map.set('privacy', privacyPreference(action.status.visibility, defaultCompose.privacy));
         map.set('focusDate', new Date());
@@ -334,6 +342,7 @@ export default function compose(state = initialState, action: ComposeAction | Ev
 
         map.set('quote', action.status.get('id'));
         map.set('to', ImmutableOrderedSet<string>([author]));
+        map.set('parent_reblogged_by', null);
         map.set('text', '');
         map.set('privacy', privacyPreference(action.status.visibility, defaultCompose.privacy));
         map.set('focusDate', new Date());
@@ -435,11 +444,13 @@ export default function compose(state = initialState, action: ComposeAction | Ev
         })));
     case COMPOSE_SET_STATUS:
       return updateCompose(state, 'compose-modal', compose => compose.withMutations(map => {
+        const to = action.explicitAddressing ? getExplicitMentions(action.status.account.id, action.status) : ImmutableOrderedSet<string>();
         if (!action.withRedraft && !action.draftId) {
           map.set('id', action.status.id);
         }
         map.set('text', action.rawText || unescapeHTML(expandMentions(action.status)));
-        map.set('to', action.explicitAddressing ? getExplicitMentions(action.status.account.id, action.status) : ImmutableOrderedSet<string>());
+        map.set('to', to);
+        map.set('parent_reblogged_by', null);
         map.set('in_reply_to', action.status.get('in_reply_to_id'));
         map.set('privacy', action.status.get('visibility'));
         map.set('focusDate', new Date());