diff --git a/dist/mparticle.common.js b/dist/mparticle.common.js
index 8879f11a9..23929032a 100644
--- a/dist/mparticle.common.js
+++ b/dist/mparticle.common.js
@@ -1401,7 +1401,7 @@ ScCid:{mappedKey:"SnapchatConversions.ClickId",output:IntegrationOutputs.CUSTOM_
 // }
 for(var e in this.clickIds)if(this.clickIds.hasOwnProperty(e)){var f=this.clickIds[e],g=null===(b=this.filteredIntegrationAttributeMappings[e])||void 0===b?void 0:b.mappedKey;if(!isEmpty(g)){var h=null===(c=this.filteredIntegrationAttributeMappings[e])||void 0===c?void 0:c.moduleId;h&&!d[h]&&(d[h]=(a={},a[g]=f,a));}}return d},a.prototype.getClickIds=function(a,b){var c,d={};if(!a)return d;for(var e in a)if(a.hasOwnProperty(e)){var f=a[e],g=null===(c=b[e])||void 0===c?void 0:c.mappedKey;isEmpty(g)||(d[g]=f);}return d},a.prototype.applyProcessors=function(a,b,c){var d,e={};for(var f in a)if(a.hasOwnProperty(f)){var g=a[f],h=null===(d=integrationMapping[f])||void 0===d?void 0:d.processor;e[f]=h?h(g,b,c):g;}return e},a.prototype.filterMappings=function(a){var b={};for(var c in integrationMapping)integrationMapping[c].output===a&&(b[c]=integrationMapping[c]);return b},a}();
 
-var RoktManager=/** @class */function(){function a(){this.launcher=null,this.messageQueue=[],this.launcher=null;}return a.prototype.attachLauncher=function(a){this.setLauncher(a),this.processMessageQueue();},a.prototype.selectPlacements=function(a){if(!this.launcher)return this.queueMessage({methodName:"selectPlacements",payload:a}),Promise.resolve({});try{return this.launcher.selectPlacements(a)}catch(a){return Promise.reject(a instanceof Error?a:new Error("Unknown error occurred"))}},a.prototype.processMessageQueue=function(){var a=this;0<this.messageQueue.length&&(this.messageQueue.forEach(function(b){return __awaiter(a,void 0,void 0,function(){return __generator(this,function(a){switch(a.label){case 0:return this.launcher&&b.methodName in this.launcher?[4/*yield*/,this.launcher[b.methodName](b.payload)]:[3/*break*/,2];case 1:a.sent(),a.label=2;case 2:return [2/*return*/]}})})}),this.messageQueue=[]);},a.prototype.queueMessage=function(a){this.messageQueue.push(a);},a.prototype.setLauncher=function(a){this.launcher=a;},a}();
+var RoktManager=/** @class */function(){function a(){this.launcher=null,this.messageQueue=[],this.launcher=null;}return a.prototype.attachLauncher=function(a){this.setLauncher(a),this.processMessageQueue();},a.prototype.selectPlacements=function(a){if(!this.launcher)return this.queueMessage({methodName:"selectPlacements",payload:a}),Promise.resolve({});try{var b=this.launcher.preSelectionCallback();return console.log("[RoktManager] preSelectionAttributes",b),a.attributes=__assign(__assign({},a.attributes),b),console.log("[RoktManager] selectPlacement attributes",a.attributes),this.launcher.selectPlacements(a)}catch(a){return Promise.reject(a instanceof Error?a:new Error("Unknown error occurred"))}},a.prototype.processMessageQueue=function(){var a=this;0<this.messageQueue.length&&(this.messageQueue.forEach(function(b){return __awaiter(a,void 0,void 0,function(){return __generator(this,function(a){switch(a.label){case 0:return this.launcher&&b.methodName in this.launcher?[4/*yield*/,this.launcher[b.methodName](b.payload)]:[3/*break*/,2];case 1:a.sent(),a.label=2;case 2:return [2/*return*/]}})})}),this.messageQueue=[]);},a.prototype.queueMessage=function(a){this.messageQueue.push(a);},a.prototype.setLauncher=function(a){this.launcher=a;},a}();
 
 var Messages=Constants.Messages,HTTPCodes=Constants.HTTPCodes,FeatureFlags=Constants.FeatureFlags,ReportBatching=FeatureFlags.ReportBatching,CaptureIntegrationSpecificIds=FeatureFlags.CaptureIntegrationSpecificIds,StartingInitialization=Messages.InformationMessages.StartingInitialization;/**
  * <p>All of the following methods can be called on the primary mParticle class. In version 2.10.0, we introduced <a href="https://docs.mparticle.com/developers/sdk/web/multiple-instances/">multiple instances</a>. If you are using multiple instances (self hosted environments only), you should call these methods on each instance.</p>
diff --git a/dist/mparticle.esm.js b/dist/mparticle.esm.js
index b9d0e0281..0bb1b8a5b 100644
--- a/dist/mparticle.esm.js
+++ b/dist/mparticle.esm.js
@@ -1401,7 +1401,7 @@ ScCid:{mappedKey:"SnapchatConversions.ClickId",output:IntegrationOutputs.CUSTOM_
 // }
 for(var e in this.clickIds)if(this.clickIds.hasOwnProperty(e)){var f=this.clickIds[e],g=null===(b=this.filteredIntegrationAttributeMappings[e])||void 0===b?void 0:b.mappedKey;if(!isEmpty(g)){var h=null===(c=this.filteredIntegrationAttributeMappings[e])||void 0===c?void 0:c.moduleId;h&&!d[h]&&(d[h]=(a={},a[g]=f,a));}}return d},a.prototype.getClickIds=function(a,b){var c,d={};if(!a)return d;for(var e in a)if(a.hasOwnProperty(e)){var f=a[e],g=null===(c=b[e])||void 0===c?void 0:c.mappedKey;isEmpty(g)||(d[g]=f);}return d},a.prototype.applyProcessors=function(a,b,c){var d,e={};for(var f in a)if(a.hasOwnProperty(f)){var g=a[f],h=null===(d=integrationMapping[f])||void 0===d?void 0:d.processor;e[f]=h?h(g,b,c):g;}return e},a.prototype.filterMappings=function(a){var b={};for(var c in integrationMapping)integrationMapping[c].output===a&&(b[c]=integrationMapping[c]);return b},a}();
 
-var RoktManager=/** @class */function(){function a(){this.launcher=null,this.messageQueue=[],this.launcher=null;}return a.prototype.attachLauncher=function(a){this.setLauncher(a),this.processMessageQueue();},a.prototype.selectPlacements=function(a){if(!this.launcher)return this.queueMessage({methodName:"selectPlacements",payload:a}),Promise.resolve({});try{return this.launcher.selectPlacements(a)}catch(a){return Promise.reject(a instanceof Error?a:new Error("Unknown error occurred"))}},a.prototype.processMessageQueue=function(){var a=this;0<this.messageQueue.length&&(this.messageQueue.forEach(function(b){return __awaiter(a,void 0,void 0,function(){return __generator(this,function(a){switch(a.label){case 0:return this.launcher&&b.methodName in this.launcher?[4/*yield*/,this.launcher[b.methodName](b.payload)]:[3/*break*/,2];case 1:a.sent(),a.label=2;case 2:return [2/*return*/]}})})}),this.messageQueue=[]);},a.prototype.queueMessage=function(a){this.messageQueue.push(a);},a.prototype.setLauncher=function(a){this.launcher=a;},a}();
+var RoktManager=/** @class */function(){function a(){this.launcher=null,this.messageQueue=[],this.launcher=null;}return a.prototype.attachLauncher=function(a){this.setLauncher(a),this.processMessageQueue();},a.prototype.selectPlacements=function(a){if(!this.launcher)return this.queueMessage({methodName:"selectPlacements",payload:a}),Promise.resolve({});try{var b=this.launcher.preSelectionCallback();return console.log("[RoktManager] preSelectionAttributes",b),a.attributes=__assign(__assign({},a.attributes),b),console.log("[RoktManager] selectPlacement attributes",a.attributes),this.launcher.selectPlacements(a)}catch(a){return Promise.reject(a instanceof Error?a:new Error("Unknown error occurred"))}},a.prototype.processMessageQueue=function(){var a=this;0<this.messageQueue.length&&(this.messageQueue.forEach(function(b){return __awaiter(a,void 0,void 0,function(){return __generator(this,function(a){switch(a.label){case 0:return this.launcher&&b.methodName in this.launcher?[4/*yield*/,this.launcher[b.methodName](b.payload)]:[3/*break*/,2];case 1:a.sent(),a.label=2;case 2:return [2/*return*/]}})})}),this.messageQueue=[]);},a.prototype.queueMessage=function(a){this.messageQueue.push(a);},a.prototype.setLauncher=function(a){this.launcher=a;},a}();
 
 var Messages=Constants.Messages,HTTPCodes=Constants.HTTPCodes,FeatureFlags=Constants.FeatureFlags,ReportBatching=FeatureFlags.ReportBatching,CaptureIntegrationSpecificIds=FeatureFlags.CaptureIntegrationSpecificIds,StartingInitialization=Messages.InformationMessages.StartingInitialization;/**
  * <p>All of the following methods can be called on the primary mParticle class. In version 2.10.0, we introduced <a href="https://docs.mparticle.com/developers/sdk/web/multiple-instances/">multiple instances</a>. If you are using multiple instances (self hosted environments only), you should call these methods on each instance.</p>
diff --git a/dist/mparticle.js b/dist/mparticle.js
index 53b744f8b..f974ba6b4 100644
--- a/dist/mparticle.js
+++ b/dist/mparticle.js
@@ -9623,6 +9623,10 @@ var mParticle = (function () {
           return Promise.resolve({});
         }
         try {
+          var preSelectionAttributes = this.launcher.preSelectionCallback();
+          console.log('[RoktManager] preSelectionAttributes', preSelectionAttributes);
+          options.attributes = __assign(__assign({}, options.attributes), preSelectionAttributes);
+          console.log('[RoktManager] selectPlacement attributes', options.attributes);
           return this.launcher.selectPlacements(options);
         } catch (error) {
           return Promise.reject(error instanceof Error ? error : new Error('Unknown error occurred'));
diff --git a/src/roktManager.ts b/src/roktManager.ts
index a00db28a8..917807aef 100644
--- a/src/roktManager.ts
+++ b/src/roktManager.ts
@@ -18,6 +18,7 @@ export interface IRoktSelection {
 
 export interface IRoktLauncher {
     selectPlacements: (options: IRoktSelectPlacementsOptions) => Promise<IRoktSelection>;
+    preSelectionCallback: () => IRoktPartnerAttributes;
 }
 
 export interface IRoktMessage {
@@ -48,6 +49,10 @@ export default class RoktManager {
         }
 
         try {
+            const preSelectionAttributes = this.launcher.preSelectionCallback();
+            console.log('[RoktManager] preSelectionAttributes', preSelectionAttributes);
+            options.attributes = { ...options.attributes, ...preSelectionAttributes };
+            console.log('[RoktManager] selectPlacement attributes', options.attributes);
             return this.launcher.selectPlacements(options);
         } catch (error) {
             return Promise.reject(error instanceof Error ? error : new Error('Unknown error occurred'));
diff --git a/test/jest/roktManager.spec.ts b/test/jest/roktManager.spec.ts
index 24bbb6d5d..73c6016a5 100644
--- a/test/jest/roktManager.spec.ts
+++ b/test/jest/roktManager.spec.ts
@@ -26,7 +26,8 @@ describe('RoktManager', () => {
 
         it('should process the message queue if a launcher is attached', () => {
             const launcher: IRoktLauncher = {
-                selectPlacements: jest.fn()
+                selectPlacements: jest.fn(),
+                preSelectionCallback: jest.fn()
             };
             
             roktManager.selectPlacements({} as IRoktSelectPlacementsOptions);
@@ -45,7 +46,8 @@ describe('RoktManager', () => {
     describe('#selectPlacements', () => {
         it('should call launcher.selectPlacements with empty attributes', () => {
             const launcher: IRoktLauncher = {
-                selectPlacements: jest.fn()
+                selectPlacements: jest.fn(),
+                preSelectionCallback: jest.fn()
             };
 
             roktManager.attachLauncher(launcher);
@@ -59,7 +61,8 @@ describe('RoktManager', () => {
 
         it('should call launcher.selectPlacements with passed in attributes', () => {
             const launcher: IRoktLauncher = {
-                selectPlacements: jest.fn()
+                selectPlacements: jest.fn(),
+                preSelectionCallback: jest.fn()
             };
 
             roktManager.attachLauncher(launcher);
@@ -93,7 +96,8 @@ describe('RoktManager', () => {
 
         it('should process queued selectPlacements calls once the launcher is attached', () => {
             const launcher: IRoktLauncher = {
-                selectPlacements: jest.fn()
+                selectPlacements: jest.fn(),
+                preSelectionCallback: jest.fn()
             };
 
             const options = {