diff --git a/src/constants.json b/src/constants.json
index 4d029c87458..aa88fae3178 100644
--- a/src/constants.json
+++ b/src/constants.json
@@ -34,7 +34,8 @@
     "BID_TIMEOUT": "bidTimeout",
     "BID_REQUESTED": "bidRequested",
     "BID_RESPONSE": "bidResponse",
-    "BID_WON": "bidWon"
+    "BID_WON": "bidWon",
+    "SET_TARGETING": "setTargeting"
   },
   "EVENT_ID_PATHS": {
     "bidWon": "adUnitCode"
diff --git a/src/prebid.js b/src/prebid.js
index def4e2ff738..49cdf9d06c1 100644
--- a/src/prebid.js
+++ b/src/prebid.js
@@ -25,6 +25,7 @@ var objectType_function = 'function';
 var objectType_undefined = 'undefined';
 var objectType_object = 'object';
 var BID_WON = CONSTANTS.EVENTS.BID_WON;
+var SET_TARGETING = CONSTANTS.EVENTS.SET_TARGETING;
 
 var auctionRunning = false;
 var bidRequestQueue = [];
@@ -244,8 +245,12 @@ $$PREBID_GLOBAL$$.setTargetingForGPTAsync = function () {
 
   //first reset any old targeting
   targeting.resetPresetTargeting();
+  
   //now set new targeting keys
   targeting.setTargeting(targeting.getAllTargeting());
+  
+  //emit event 
+  events.emit(SET_TARGETING);
 };
 
 $$PREBID_GLOBAL$$.setTargetingForAst = function() {
@@ -256,6 +261,9 @@ $$PREBID_GLOBAL$$.setTargetingForAst = function() {
   }
 
   targeting.setTargetingForAst();
+  
+  //emit event 
+  events.emit(SET_TARGETING);
 };
 
 /**
diff --git a/test/spec/unit/pbjs_api_spec.js b/test/spec/unit/pbjs_api_spec.js
index 98538a5cd1a..c414ba1b8cb 100644
--- a/test/spec/unit/pbjs_api_spec.js
+++ b/test/spec/unit/pbjs_api_spec.js
@@ -483,6 +483,18 @@ describe('Unit: Prebid Module', function () {
       assert.ok(logErrorSpy.calledWith(error), 'expected error was logged');
       window.googletag = windowGoogletagBackup;
     });
+
+    it('should emit SET_TARGETING event when successfully invoked', function() {
+      var slots = createSlotArray();
+      window.googletag.pubads().setSlots(slots);
+
+      var callback = sinon.spy();
+
+      $$PREBID_GLOBAL$$.onEvent('setTargeting', callback);
+      $$PREBID_GLOBAL$$.setTargetingForGPTAsync(config.adUnitCodes);
+
+      sinon.assert.calledOnce(callback);
+    })
   });
 
   describe('allBidsAvailable', function () {