diff --git a/web/chat/reaction-tooltip.react.js b/web/chat/reaction-tooltip.react.js
--- a/web/chat/reaction-tooltip.react.js
+++ b/web/chat/reaction-tooltip.react.js
@@ -3,6 +3,7 @@
 import * as React from 'react';
 
 import { useModalContext } from 'lib/components/modal-provider.react.js';
+import { useENSNames } from 'lib/hooks/ens-cache.js';
 import type { ReactionInfo } from 'lib/selectors/chat-selectors';
 
 import {
@@ -14,6 +15,8 @@
 import css from './reaction-tooltip.css';
 import MessageReactionsModal from '../modals/chat/message-reactions-modal.react.js';
 
+const useENSNamesOptions = { allAtOnce: true };
+
 type Props = {
   +reactions: ReactionInfo,
   +reaction: string,
@@ -21,6 +24,8 @@
 
 function ReactionTooltip(props: Props): React.Node {
   const { reactions, reaction } = props;
+  const { users } = reactions[reaction];
+
   const { pushModal, popModal } = useModalContext();
 
   const onClickReactionTooltip = React.useCallback(
@@ -34,10 +39,10 @@
     [popModal, pushModal, reactions],
   );
 
-  const usernames = React.useMemo(() => {
-    const { users } = reactions[reaction];
+  const resolvedUsers = useENSNames(users, useENSNamesOptions);
 
-    return users.map(user => (
+  const usernames = React.useMemo(() => {
+    return resolvedUsers.map(user => (
       <p
         key={user.id}
         className={css.usernameText}
@@ -46,7 +51,7 @@
         {user.username}
       </p>
     ));
-  }, [reaction, reactions]);
+  }, [resolvedUsers]);
 
   let seeMoreText;
   if (usernames && usernames.length > 5) {