diff --git a/assets/js/MinterBoard.js b/assets/js/MinterBoard.js
index 4456aea..605cf74 100644
--- a/assets/js/MinterBoard.js
+++ b/assets/js/MinterBoard.js
@@ -245,7 +245,18 @@ const loadCards = async () => {
       return;
     }
 
-    const finalCards = await processMinterCards(validCards)
+    // Filter out cards owned by addresses already in the Minter group.
+    const minterGroupData = await fetchMinterGroupMembers();
+    const minterGroupAddresses = minterGroupData.map(m => m.member);
+    const notInMinterGroupCards = validCards.filter(
+      (card) => !minterGroupAddresses.includes(card.address)
+    );
+
+    if (notInMinterGroupCards.length === 0) {
+      cardsContainer.innerHTML = "<p>No cards to display. (All belong to existing Minters.)</p>";
+      return;
+    }
+    const finalCards = await processMinterCards(notInMinterGroupCards);
 
     // Sort cards by timestamp descending (newest first)
     // validCards.sort((a, b) => {