diff --git a/src/app/ItemTradesPage.js b/src/app/ItemTradesPage.js
index 06ac2d3..a076080 100644
--- a/src/app/ItemTradesPage.js
+++ b/src/app/ItemTradesPage.js
@@ -29,7 +29,7 @@ export function ItemTradesOfferingPage() {
               user {
                 id
                 username
-                # lastUpdatedAnyTrade
+                lastTradeActivity
               }
               closetList {
                 id
@@ -58,7 +58,7 @@ export function ItemTradesSeekingPage() {
               user {
                 id
                 username
-                # lastUpdatedAnyTrade
+                lastTradeActivity
               }
               closetList {
                 id
@@ -155,7 +155,7 @@ function ItemTradesTable({
           <ItemTradesTableCell as="th" width={{ base: "23%", md: "18ex" }}>
             {/* A small wording tweak to fit better on the xsmall screens! */}
             <Box display={{ base: "none", sm: "block" }}>Last active</Box>
-            <Box display={{ base: "block", sm: "none" }}>Updated</Box>
+            <Box display={{ base: "block", sm: "none" }}>Active at</Box>
           </ItemTradesTableCell>
           <ItemTradesTableCell as="th" width={{ base: "23%", md: "18ex" }}>
             Compare
@@ -181,6 +181,7 @@ function ItemTradesTable({
               href={`/user/${trade.user.id}/items#list-${trade.closetList.id}`}
               username={trade.user.username}
               listName={trade.closetList.name}
+              lastTradeActivity={trade.user.lastTradeActivity}
             />
           ))}
         {!loading && data.item.trades.length === 0 && (
@@ -199,7 +200,13 @@ function ItemTradesTable({
   );
 }
 
-function ItemTradesTableRow({ compareListHeading, href, username, listName }) {
+function ItemTradesTableRow({
+  compareListHeading,
+  href,
+  username,
+  listName,
+  lastTradeActivity,
+}) {
   const history = useHistory();
   const onClick = React.useCallback(() => history.push(href), [history, href]);
   const focusBackground = useColorModeValue("gray.100", "gray.600");
@@ -232,8 +239,10 @@ function ItemTradesTableRow({ compareListHeading, href, username, listName }) {
         {username}
       </ItemTradesTableCell>
       <ItemTradesTableCell fontSize="xs">
-        <Box display={{ base: "block", sm: "none" }}>&lt;1 week</Box>
-        <Box display={{ base: "none", sm: "block" }}>This week</Box>
+        {new Intl.DateTimeFormat("en", {
+          month: "short",
+          year: "numeric",
+        }).format(new Date(lastTradeActivity))}
       </ItemTradesTableCell>
       <ItemTradesTableCell fontSize="xs">
         <Tooltip
@@ -249,6 +258,7 @@ function ItemTradesTableRow({ compareListHeading, href, username, listName }) {
                   Constellation Dress
                 </Box>
               </Box>
+              <Box>(WIP: This is placeholder data!)</Box>
             </Box>
           }
         >
diff --git a/src/server/loaders.js b/src/server/loaders.js
index e2108af..57df5dc 100644
--- a/src/server/loaders.js
+++ b/src/server/loaders.js
@@ -919,6 +919,44 @@ const buildUserClosetListsLoader = (db, loaders) =>
     );
   });
 
+const buildUserLastTradeActivityLoader = (db) =>
+  new DataLoader(async (userIds) => {
+    const qs = userIds.map((_) => "?").join(",");
+    const [rows, _] = await db.execute(
+      `
+        SELECT
+          closet_hangers.user_id AS user_id,
+            MAX(closet_hangers.updated_at) AS last_trade_activity
+          FROM closet_hangers
+          INNER JOIN users ON users.id = closet_hangers.user_id
+          LEFT JOIN closet_lists ON closet_lists.id = closet_hangers.list_id
+          WHERE (
+            closet_hangers.user_id IN (${qs})
+            AND (
+              (closet_hangers.list_id IS NOT NULL AND closet_lists.visibility >= 2)
+              OR (
+                closet_hangers.list_id IS NULL AND closet_hangers.owned = 1
+                AND users.owned_closet_hangers_visibility >= 2
+              )
+              OR (
+                closet_hangers.list_id IS NULL AND closet_hangers.owned = 0
+                AND users.wanted_closet_hangers_visibility >= 2
+              )
+            )
+          )
+          GROUP BY closet_hangers.user_id
+      `,
+      userIds
+    );
+
+    const entities = rows.map(normalizeRow);
+
+    return userIds.map((userId) => {
+      const entity = entities.find((e) => e.userId === String(userId));
+      return entity ? entity.lastTradeActivity : null;
+    });
+  });
+
 const buildZoneLoader = (db) => {
   const zoneLoader = new DataLoader(async (ids) => {
     const qs = ids.map((_) => "?").join(",");
@@ -1022,6 +1060,7 @@ function buildLoaders(db) {
   loaders.userByEmailLoader = buildUserByEmailLoader(db);
   loaders.userClosetHangersLoader = buildUserClosetHangersLoader(db);
   loaders.userClosetListsLoader = buildUserClosetListsLoader(db, loaders);
+  loaders.userLastTradeActivityLoader = buildUserLastTradeActivityLoader(db);
   loaders.zoneLoader = buildZoneLoader(db);
   loaders.zoneTranslationLoader = buildZoneTranslationLoader(db);
 
diff --git a/src/server/types/User.js b/src/server/types/User.js
index 14af26c..5c521a3 100644
--- a/src/server/types/User.js
+++ b/src/server/types/User.js
@@ -10,6 +10,10 @@ const typeDefs = gql`
 
     itemsTheyOwn: [Item!]!
     itemsTheyWant: [Item!]!
+
+    # When this user last updated any of their trade lists, as an ISO 8601
+    # timestamp.
+    lastTradeActivity: String!
   }
 
   extend type Query {
@@ -166,6 +170,11 @@ const resolvers = {
 
       return closetListNodes;
     },
+
+    lastTradeActivity: async ({ id }, _, { userLastTradeActivityLoader }) => {
+      const lastTradeActivity = await userLastTradeActivityLoader.load(id);
+      return lastTradeActivity.toISOString();
+    },
   },
 
   Query: {