diff --git a/adapters.json b/adapters.json
index 6fad373286b..06a353e6541 100644
--- a/adapters.json
+++ b/adapters.json
@@ -12,6 +12,7 @@
     "conversant",
     "districtmDMX",
     "getintent",
+    "gumgum",
     "hiromedia",
     "indexExchange",
     "kruxlink",
diff --git a/integrationExamples/gpt/pbjs_example_gpt.html b/integrationExamples/gpt/pbjs_example_gpt.html
index 456f1ce09cb..4c5fd87798d 100644
--- a/integrationExamples/gpt/pbjs_example_gpt.html
+++ b/integrationExamples/gpt/pbjs_example_gpt.html
@@ -319,6 +319,12 @@
                         params: {
                             tagid: 007,  	// REQUIRED int. To get one, contact http://www.memeglobal.com
                         }
+                    },
+                    {
+                        bidder: 'gumgum',
+                        params: {
+                            inScreen: 'ggumtest' // REQUIRED str Tracking Id
+                        }
                     }
                 ]
             }
diff --git a/src/adapters/gumgum.js b/src/adapters/gumgum.js
new file mode 100644
index 00000000000..36b53c4e060
--- /dev/null
+++ b/src/adapters/gumgum.js
@@ -0,0 +1,114 @@
+const bidfactory = require('../bidfactory');
+const bidmanager = require('../bidmanager');
+const utils      = require('../utils');
+const adloader   = require('../adloader');
+
+const BIDDER_CODE = 'gumgum';
+const CALLBACKS = {};
+
+const GumgumAdapter = function GumgumAdapter() {
+
+  const bidEndpoint = `https://g2.gumgum.com/hbid/imp`;
+
+  const WINDOW = global.top;
+  const SCREEN = WINDOW.screen;
+
+  function _callBids({ bids }) {
+    const browserParams = {
+      vw: WINDOW.innerWidth,
+      vh: WINDOW.innerHeight,
+      sw: SCREEN.width,
+      sh: SCREEN.height,
+      pu: WINDOW.location.href,
+      dpr: WINDOW.devicePixelRatio || 1
+    };
+    utils._each(bids, bidRequest => {
+      const { bidId
+            , params = {}
+            , placementCode
+            } = bidRequest;
+      const trackingId = params.inScreen;
+      const nativeId   = params.native;
+      const slotId     = params.inSlot;
+      const bid = {};
+
+      /* slot/native ads need the placement id */
+      switch (true) {
+        case !!(params.inImage):  bid.pi = 1; break;
+        case !!(params.inScreen): bid.pi = 2; break;
+        case !!(params.inSlot):   bid.pi = 3; break;
+        case !!(params.native):   bid.pi = 5; break;
+        default: return utils.logWarn(
+          `[GumGum] No product selected for the placement ${placementCode}` +
+          ', please check your implementation.'
+        );
+      }
+      /* tracking id is required for in-image and in-screen */
+      if (trackingId) bid.t = trackingId;
+      /* native ads require a native placement id */
+      if (nativeId) bid.ni = nativeId;
+      /* slot ads require a slot id */
+      if (slotId) bid.si = slotId;
+
+      const cachedBid = Object.assign({
+        placementCode,
+        id: bidId
+      }, bid);
+
+      const callback = { jsonp: `$$PREBID_GLOBAL$$.handleGumGumCB['${ bidId }']` };
+      CALLBACKS[bidId] = _handleGumGumResponse(cachedBid);
+      const query = Object.assign(callback, browserParams, bid);
+      const bidCall = `${bidEndpoint}?${utils.parseQueryStringParameters(query)}`;
+      adloader.loadScript(bidCall);
+    });
+  }
+
+  const _handleGumGumResponse = cachedBidRequest => bidResponse => {
+    const ad = bidResponse && bidResponse.ad;
+    if (ad && ad.id) {
+      const bid = bidfactory.createBid(1);
+      const { t: trackingId
+            , pi: productId
+            , placementCode
+            } = cachedBidRequest;
+      bidResponse.placementCode = placementCode;
+      const encodedResponse = encodeURIComponent(JSON.stringify(bidResponse));
+      const gumgumAdLoader = `<script>
+        (function (context, topWindow, d, s, G) {
+          G = topWindow.GUMGUM;
+          d = topWindow.document;
+          function loadAd() {
+            topWindow.GUMGUM.pbjs("${ trackingId }", ${ productId }, "${ encodedResponse }" , context, topWindow);
+          }
+          if (G) {
+            loadAd();
+          } else {
+            topWindow.$$PREBID_GLOBAL$$.loadScript("https://g2.gumgum.com/javascripts/ggv2.js", loadAd);
+          }
+        }(window, top));
+      </script>`;
+      Object.assign(bid, {
+        cpm: ad.price,
+        ad: gumgumAdLoader,
+        width: ad.width,
+        height: ad.height,
+        bidderCode: BIDDER_CODE
+      });
+      bidmanager.addBidResponse(cachedBidRequest.placementCode, bid);
+    } else {
+      const noBid = bidfactory.createBid(2);
+      noBid.bidderCode = BIDDER_CODE;
+      bidmanager.addBidResponse(cachedBidRequest.placementCode, noBid);
+    }
+    delete CALLBACKS[cachedBidRequest.id];
+  };
+
+  window.$$PREBID_GLOBAL$$.handleGumGumCB = CALLBACKS;
+
+  return {
+    callBids: _callBids
+  };
+
+};
+
+module.exports = GumgumAdapter;
diff --git a/test/spec/adapters/gumgum_spec.js b/test/spec/adapters/gumgum_spec.js
new file mode 100644
index 00000000000..1c4f8a329f7
--- /dev/null
+++ b/test/spec/adapters/gumgum_spec.js
@@ -0,0 +1,201 @@
+import {expect} from 'chai';
+import Adapter from '../../../src/adapters/gumgum';
+import bidManager from '../../../src/bidmanager';
+import adLoader from '../../../src/adloader';
+import { STATUS } from '../../../src/constants';
+
+describe('gumgum adapter', () => {
+  'use strict';
+
+  let adapter;
+  let sandbox;
+
+  const TEST = {
+    PUBLISHER_IDENTITY: 'ggumtest',
+    BIDDER_CODE: 'gumgum',
+    PLACEMENT: 'placementId',
+    CPM: 2
+  };
+  const bidderRequest = {
+    bidderCode: TEST.BIDDER_CODE,
+    bids: [{ // in-screen
+      bidId: 'InScreenBidId',
+      bidder: TEST.BIDDER_CODE,
+      placementCode: TEST.PLACEMENT,
+      sizes: [ [728, 90] ],
+      params: {
+        inScreen: TEST.PUBLISHER_IDENTITY
+      }
+    }, { // in-image
+      bidId: 'InImageBidId',
+      bidder: TEST.BIDDER_CODE,
+      placementCode: TEST.PLACEMENT,
+      sizes: [ [728, 90] ],
+      params: {
+        inImage: TEST.PUBLISHER_IDENTITY
+      }
+    }, { // native
+      bidId: 'NativeBidId',
+      bidder: TEST.BIDDER_CODE,
+      placementCode: TEST.PLACEMENT,
+      sizes: [ [728, 90] ],
+      params: {
+        native: 10
+      }
+    }, { // slot
+      bidId: 'InSlotBidId',
+      bidder: TEST.BIDDER_CODE,
+      placementCode: TEST.PLACEMENT,
+      sizes: [ [728, 90] ],
+      params: {
+        inSlot: 10
+      }
+    }, { // no identity
+      bidId: 'NoIdentityBidId',
+      bidder: TEST.BIDDER_CODE,
+      placementCode: TEST.PLACEMENT,
+      sizes: [ [728, 90] ]
+    }]
+  };
+  const bidderResponse = {
+    "ad": {
+      "id": 1,
+      "width": 728,
+      "height": 90,
+      "markup": "<div>some fancy ad</div>",
+      "ii": true,
+      "du": "http://example.com/",
+      "price": TEST.CPM,
+      "impurl": "http://example.com/"
+    }
+  };
+
+  function mockBidResponse(response) {
+    sandbox.stub(bidManager, 'addBidResponse');
+    sandbox.stub(adLoader, 'loadScript');
+    adapter.callBids(bidderRequest);
+    pbjs.handleGumGumCB['InScreenBidId'](response);
+    return bidManager.addBidResponse.firstCall.args[1];
+  }
+
+  beforeEach(() => {
+    adapter = new Adapter();
+    sandbox = sinon.sandbox.create();
+  });
+
+  afterEach(() => {
+    sandbox.restore();
+  });
+
+  describe('callBids', () => {
+
+    beforeEach(() => {
+      sandbox.stub(adLoader, 'loadScript');
+      adapter.callBids(bidderRequest);
+    });
+
+    it('should call the endpoint once per valid bid', () => {
+      sinon.assert.callCount(adLoader.loadScript, 4);
+    });
+
+    it('should include required browser data', () => {
+      const endpointRequest = expect(adLoader.loadScript.firstCall.args[0]);
+      endpointRequest.to.include('vw');
+      endpointRequest.to.include('vh');
+      endpointRequest.to.include('sw');
+      endpointRequest.to.include('sh');
+    });
+
+    it('should include the publisher identity', () => {
+      const endpointRequest = expect(adLoader.loadScript.firstCall.args[0]);
+      endpointRequest.to.include('t=' + TEST.PUBLISHER_IDENTITY);
+    });
+
+    it('first call should be in-screen', () => {
+      expect(adLoader.loadScript.firstCall.args[0]).to.include('pi=2');
+    });
+
+    it('second call should be in-image', () => {
+      expect(adLoader.loadScript.secondCall.args[0]).to.include('pi=1');
+    });
+
+    it('third call should be native', () => {
+      expect(adLoader.loadScript.thirdCall.args[0]).to.include('pi=5');
+    });
+
+    it('last call should be slot', () => {
+      expect(adLoader.loadScript.lastCall.args[0]).to.include('pi=3');
+    });
+
+  });
+
+  describe('handleGumGumCB[...]', () => {
+    it('should exist and be a function', () => {
+      expect(pbjs.handleGumGumCB['InScreenBidId']).to.exist.and.to.be.a('function');
+    });
+  });
+
+  describe('respond with a successful bid', () => {
+
+    let successfulBid;
+
+    beforeEach(() => {
+      successfulBid = mockBidResponse(bidderResponse);
+    });
+
+    it('should add one bid', () => {
+      sinon.assert.calledOnce(bidManager.addBidResponse);
+    });
+
+    it('should pass the correct placement code as the first param', () => {
+      const [ placementCode ] = bidManager.addBidResponse.firstCall.args;
+      expect(placementCode).to.eql(TEST.PLACEMENT);
+    });
+
+    it('should have a GOOD status code', () => {
+      expect(successfulBid.getStatusCode()).to.eql(STATUS.GOOD);
+    });
+
+    it('should use the CPM returned by the server', () => {
+      expect(successfulBid).to.have.property('cpm', TEST.CPM);
+    });
+
+    it('should have an ad', () => {
+      expect(successfulBid).to.have.property('ad');
+    });
+
+    it('should have the size specified by the server', () => {
+      expect(successfulBid).to.have.property('width', 728);
+      expect(successfulBid).to.have.property('height', 90);
+    });
+
+  });
+
+  describe('respond with an empty bid', () => {
+
+    let noBid;
+
+    beforeEach(() => {
+      noBid = mockBidResponse({});
+    });
+
+    it('should add one bid', () => {
+      sinon.assert.calledOnce(bidManager.addBidResponse);
+    });
+
+    it('should have a NO_BID status code', () => {
+      expect(noBid.getStatusCode()).to.eql(STATUS.NO_BID);
+    });
+
+    it('should pass the correct placement code as the first parameter', () => {
+      const [ placementCode ] = bidManager.addBidResponse.firstCall.args;
+      expect(placementCode).to.eql(TEST.PLACEMENT);
+    });
+
+    it('should add the bidder code to the bid object', () => {
+      expect(noBid).to.have.property('bidderCode', TEST.BIDDER_CODE);
+    });
+
+  });
+
+});