diff --git a/modules/adfBidAdapter.js b/modules/adfBidAdapter.js
index 881b1adfcc4..27fb36a225d 100644
--- a/modules/adfBidAdapter.js
+++ b/modules/adfBidAdapter.js
@@ -78,6 +78,7 @@ export const spec = {
       const bidfloor = floorInfo.floor;
       const bidfloorcur = floorInfo.currency;
       const { mid, inv, mname } = bid.params;
+      const impExtData = bid.ortb2Imp?.ext?.data;
 
       const imp = {
         id: id + 1,
@@ -85,6 +86,7 @@ export const spec = {
         bidfloor,
         bidfloorcur,
         ext: {
+          data: impExtData,
           bidder: {
             inv,
             mname
diff --git a/test/spec/modules/adfBidAdapter_spec.js b/test/spec/modules/adfBidAdapter_spec.js
index d4c5f5c3c38..2ec1cdf719c 100644
--- a/test/spec/modules/adfBidAdapter_spec.js
+++ b/test/spec/modules/adfBidAdapter_spec.js
@@ -429,6 +429,18 @@ describe('Adf adapter', function () {
         }
       });
 
+      it('should add first party data', function () {
+        let validBidRequests = [
+          { bidId: 'bidId', params: { mid: 1000 }, mediaTypes: { video: {} }, ortb2Imp: { ext: { data: { some: 'value' } } } },
+          { bidId: 'bidId2', params: { mid: 1001 }, mediaTypes: { video: {} }, ortb2Imp: { ext: { data: { some: 'value', another: 1 } } } },
+          { bidId: 'bidId3', params: { mid: 1002 }, mediaTypes: { video: {} }, ortb2Imp: { ext: {} } }
+        ];
+        let imps = JSON.parse(spec.buildRequests(validBidRequests, { refererInfo: { page: 'page' } }).data).imp;
+        for (let i = 0; i < 3; i++) {
+          assert.deepEqual(imps[i].ext.data, validBidRequests[i].ortb2Imp.ext.data);
+        }
+      });
+
       describe('dynamic placement tag', function () {
         it('should add imp parameters correctly', function () {
           const validBidRequests = [