diff --git a/modules/pubmaticBidAdapter.js b/modules/pubmaticBidAdapter.js
index 16d909c2fea..aa953fb295d 100644
--- a/modules/pubmaticBidAdapter.js
+++ b/modules/pubmaticBidAdapter.js
@@ -758,6 +758,9 @@ function _addImpressionFPD(imp, bid) {
       deepSetValue(imp, `ext.data.${prop}`, ortb2[prop]);
     }
   });
+
+  const gpid = deepAccess(bid, 'ortb2Imp.ext.gpid');
+  gpid && deepSetValue(imp, `ext.gpid`, gpid);
 }
 
 function _addFloorFromFloorModule(impObj, bid) {
diff --git a/test/spec/modules/pubmaticBidAdapter_spec.js b/test/spec/modules/pubmaticBidAdapter_spec.js
index 066004bd954..a9f80b6e25a 100644
--- a/test/spec/modules/pubmaticBidAdapter_spec.js
+++ b/test/spec/modules/pubmaticBidAdapter_spec.js
@@ -82,6 +82,7 @@ describe('PubMatic adapter', function () {
         ortb2Imp: {
           ext: {
             tid: '92489f71-1bf2-49a0-adf9-000cea934729',
+            gpid: '/1111/homepage-leftnav'
           }
         },
         schain: schainConfig
@@ -1172,6 +1173,7 @@ describe('PubMatic adapter', function () {
   		  expect(data.imp[0].tagid).to.equal('/15671365/DMDemo'); // tagid
   		  expect(data.imp[0].banner.w).to.equal(300); // width
   		  expect(data.imp[0].banner.h).to.equal(250); // height
+        expect(data.imp[0].ext.gpid).to.equal(bidRequests[0].ortb2Imp.ext.gpid);
   		  expect(data.imp[0].ext.pmZoneId).to.equal(bidRequests[0].params.pmzoneid.split(',').slice(0, 50).map(id => id.trim()).join()); // pmzoneid
         expect(data.imp[0].ext.key_val).to.exist.and.to.equal(bidRequests[0].params.dctr);
         expect(data.imp[0].bidfloorcur).to.equal(bidRequests[0].params.currency);
@@ -1439,6 +1441,7 @@ describe('PubMatic adapter', function () {
         expect(data.imp[0].banner.w).to.equal(728); // width
         expect(data.imp[0].banner.h).to.equal(90); // height
         expect(data.imp[0].banner.format).to.deep.equal([{w: 160, h: 600}]);
+        expect(data.imp[0].ext.gpid).to.equal(bidRequests[0].ortb2Imp.ext.gpid);
         expect(data.imp[0].ext.key_val).to.exist.and.to.equal(bidRequests[0].params.dctr);
         expect(data.imp[0].ext.pmZoneId).to.equal(bidRequests[0].params.pmzoneid.split(',').slice(0, 50).map(id => id.trim()).join()); // pmzoneid
         expect(data.imp[0].bidfloorcur).to.equal(bidRequests[0].params.currency);
@@ -1663,6 +1666,7 @@ describe('PubMatic adapter', function () {
         expect(data.imp[0].tagid).to.equal('/15671365/DMDemo'); // tagid
         expect(data.imp[0].banner.w).to.equal(300); // width
         expect(data.imp[0].banner.h).to.equal(250); // height
+        expect(data.imp[0].ext.gpid).to.equal(bidRequests[0].ortb2Imp.ext.gpid);
         expect(data.imp[0].ext.pmZoneId).to.equal(bidRequests[0].params.pmzoneid.split(',').slice(0, 50).map(id => id.trim()).join()); // pmzoneid
       });
 
@@ -1711,6 +1715,7 @@ describe('PubMatic adapter', function () {
   		  expect(data.imp[0].id).to.equal(bidRequests[0].bidId); // Prebid bid id is passed as id
   		  expect(data.imp[0].bidfloor).to.equal(parseFloat(bidRequests[0].params.kadfloor)); // kadfloor
   		  expect(data.imp[0].tagid).to.equal('/15671365/DMDemo'); // tagid
+        expect(data.imp[0].ext.gpid).to.equal(bidRequests[0].ortb2Imp.ext.gpid);
   		  expect(data.imp[0].banner.w).to.equal(300); // width
   		  expect(data.imp[0].banner.h).to.equal(250); // height
   		  expect(data.imp[0].ext.pmZoneId).to.equal(bidRequests[0].params.pmzoneid.split(',').slice(0, 50).map(id => id.trim()).join()); // pmzoneid
@@ -1759,6 +1764,7 @@ describe('PubMatic adapter', function () {
         expect(data.imp[0].tagid).to.equal('/15671365/DMDemo'); // tagid
         expect(data.imp[0].banner.w).to.equal(300); // width
         expect(data.imp[0].banner.h).to.equal(250); // height
+        expect(data.imp[0].ext.gpid).to.equal(bidRequests[0].ortb2Imp.ext.gpid);
         expect(data.imp[0].ext.pmZoneId).to.equal(bidRequests[0].params.pmzoneid.split(',').slice(0, 50).map(id => id.trim()).join()); // pmzoneid
 
         // second request without USP/CCPA
@@ -1909,6 +1915,33 @@ describe('PubMatic adapter', function () {
         });
 
         describe('ortb2Imp', function() {
+          describe('ortb2Imp.ext.gpid', function() {
+            beforeEach(function () {
+              if (bidRequests[0].hasOwnProperty('ortb2Imp')) {
+                delete bidRequests[0].ortb2Imp;
+              }
+            });
+
+            it('should send gpid if imp[].ext.gpid is specified', function() {
+              bidRequests[0].ortb2Imp = {
+                ext: {
+                  gpid: 'ortb2Imp.ext.gpid'
+                }
+              };
+              const request = spec.buildRequests(bidRequests, {});
+              let data = JSON.parse(request.data);
+              expect(data.imp[0].ext).to.have.property('gpid');
+              expect(data.imp[0].ext.gpid).to.equal('ortb2Imp.ext.gpid');
+            });
+
+            it('should not send if imp[].ext.gpid is not specified', function() {
+              bidRequests[0].ortb2Imp = { ext: { } };
+              const request = spec.buildRequests(bidRequests, {});
+              let data = JSON.parse(request.data);
+              expect(data.imp[0].ext).to.not.have.property('gpid');
+            });
+          });
+
           describe('ortb2Imp.ext.data.pbadslot', function() {
             beforeEach(function () {
               if (bidRequests[0].hasOwnProperty('ortb2Imp')) {