diff --git a/modules/colossussspBidAdapter.js b/modules/colossussspBidAdapter.js
new file mode 100644
index 00000000000..0f7daf8fda9
--- /dev/null
+++ b/modules/colossussspBidAdapter.js
@@ -0,0 +1,176 @@
+import { registerBidder } from '../src/adapters/bidderFactory.js';
+import { BANNER, NATIVE, VIDEO } from '../src/mediaTypes.js';
+import * as utils from '../src/utils.js';
+
+const BIDDER_CODE = 'colossusssp';
+const G_URL = 'https://colossusssp.com/?c=o&m=multi';
+const G_URL_SYNC = 'https://colossusssp.com/?c=o&m=cookie';
+
+function isBidResponseValid(bid) {
+  if (!bid.requestId || !bid.cpm || !bid.creativeId || !bid.ttl || !bid.currency) {
+    return false;
+  }
+
+  switch (bid.mediaType) {
+    case BANNER:
+      return Boolean(bid.width && bid.height && bid.ad);
+    case VIDEO:
+      return Boolean(bid.vastUrl);
+    case NATIVE:
+      return Boolean(bid.native);
+    default:
+      return false;
+  }
+}
+
+function getUserId(eids, id, source, uidExt) {
+  if (id) {
+    var uid = { id };
+    if (uidExt) {
+      uid.ext = uidExt;
+    }
+    eids.push({
+      source,
+      uids: [ uid ]
+    });
+  }
+}
+
+export const spec = {
+  code: BIDDER_CODE,
+  supportedMediaTypes: [BANNER, VIDEO, NATIVE],
+  /**
+   * Determines whether or not the given bid request is valid.
+   *
+   * @param {object} bid The bid to validate.
+   * @return boolean True if this is a valid bid, and false otherwise.
+   */
+  isBidRequestValid: (bid) => {
+    return Boolean(bid.bidId && bid.params && !isNaN(bid.params.placement_id));
+  },
+
+  /**
+   * Make a server request from the list of BidRequests.
+   *
+   * @param {BidRequest[]} validBidRequests A non-empty list of valid bid requests that should be sent to the Server.
+   * @return ServerRequest Info describing the request to the server.
+   */
+  buildRequests: (validBidRequests, bidderRequest) => {
+    const winTop = utils.getWindowTop();
+    const location = winTop.location;
+    let placements = [];
+    let request = {
+      'deviceWidth': winTop.screen.width,
+      'deviceHeight': winTop.screen.height,
+      'language': (navigator && navigator.language) ? navigator.language : '',
+      'secure': location.protocol === 'https:' ? 1 : 0,
+      'host': location.host,
+      'page': location.pathname,
+      'placements': placements,
+    };
+
+    if (bidderRequest) {
+      if (bidderRequest.uspConsent) {
+        request.ccpa = bidderRequest.uspConsent;
+      }
+      if (bidderRequest.gdprConsent) {
+        request.gdpr_consent = bidderRequest.gdprConsent.consentString || 'ALL'
+        request.gdpr_require = bidderRequest.gdprConsent.gdprApplies ? 1 : 0
+      }
+    }
+
+    for (let i = 0; i < validBidRequests.length; i++) {
+      let bid = validBidRequests[i];
+      let traff = bid.params.traffic || BANNER
+      let placement = {
+        placementId: bid.params.placement_id,
+        bidId: bid.bidId,
+        sizes: bid.mediaTypes[traff].sizes,
+        traffic: traff,
+        eids: [],
+        floor: {}
+      };
+      if (typeof bid.getFloor === 'function') {
+        let tmpFloor = {};
+        for (let size of placement.sizes) {
+          tmpFloor = bid.getFloor({
+            currency: 'USD',
+            mediaType: traff,
+            size: size
+          });
+          if (tmpFloor) {
+            placement.floor[`${size[0]}x${size[1]}`] = tmpFloor.floor;
+          }
+        }
+      }
+      if (bid.schain) {
+        placement.schain = bid.schain;
+      }
+      if (bid.userId) {
+        getUserId(placement.eids, bid.userId.britepoolid, 'britepool.com');
+        getUserId(placement.eids, bid.userId.idl_env, 'identityLink');
+        getUserId(placement.eids, bid.userId.id5id, 'id5-sync.com')
+        getUserId(placement.eids, bid.userId.tdid, 'adserver.org', {
+          rtiPartner: 'TDID'
+        });
+      }
+      if (traff === VIDEO) {
+        placement.playerSize = bid.mediaTypes[VIDEO].playerSize;
+        placement.minduration = bid.mediaTypes[VIDEO].minduration;
+        placement.maxduration = bid.mediaTypes[VIDEO].maxduration;
+        placement.mimes = bid.mediaTypes[VIDEO].mimes;
+        placement.protocols = bid.mediaTypes[VIDEO].protocols;
+        placement.startdelay = bid.mediaTypes[VIDEO].startdelay;
+        placement.placement = bid.mediaTypes[VIDEO].placement;
+        placement.skip = bid.mediaTypes[VIDEO].skip;
+        placement.skipafter = bid.mediaTypes[VIDEO].skipafter;
+        placement.minbitrate = bid.mediaTypes[VIDEO].minbitrate;
+        placement.maxbitrate = bid.mediaTypes[VIDEO].maxbitrate;
+        placement.delivery = bid.mediaTypes[VIDEO].delivery;
+        placement.playbackmethod = bid.mediaTypes[VIDEO].playbackmethod;
+        placement.api = bid.mediaTypes[VIDEO].api;
+        placement.linearity = bid.mediaTypes[VIDEO].linearity;
+      }
+      placements.push(placement);
+    }
+    return {
+      method: 'POST',
+      url: G_URL,
+      data: request
+    };
+  },
+
+  /**
+   * Unpack the response from the server into a list of bids.
+   *
+   * @param {*} serverResponse A successful response from the server.
+   * @return {Bid[]} An array of bids which were nested inside the server.
+   */
+  interpretResponse: (serverResponse) => {
+    let response = [];
+    try {
+      serverResponse = serverResponse.body;
+      for (let i = 0; i < serverResponse.length; i++) {
+        let resItem = serverResponse[i];
+        if (isBidResponseValid(resItem)) {
+          const advertiserDomains = resItem.adomain && resItem.adomain.length ? resItem.adomain : [];
+          resItem.meta = { ...resItem.meta, advertiserDomains };
+
+          response.push(resItem);
+        }
+      }
+    } catch (e) {
+      utils.logMessage(e);
+    };
+    return response;
+  },
+
+  getUserSyncs: () => {
+    return [{
+      type: 'image',
+      url: G_URL_SYNC
+    }];
+  }
+};
+
+registerBidder(spec);
diff --git a/modules/colossussspBidAdapter.md b/modules/colossussspBidAdapter.md
index d95080546c2..8797c648c95 100644
--- a/modules/colossussspBidAdapter.md
+++ b/modules/colossussspBidAdapter.md
@@ -13,19 +13,18 @@ Module that connects to Colossus SSP demand sources
 # Test Parameters
 ```
     var adUnits = [{
-                code: 'placementid_0',
-                mediaTypes: {
-                    banner: {
-                        sizes: [[300, 250], [300,600]]
-                    }
-                },
-                bids: [{
-                        bidder: 'colossusssp',
-                        params: {
-                            placement_id: 0,
-                            traffic: 'banner'
-                        }
-                    }]
-                }
-            ];
+        code: 'placementid_0',
+        mediaTypes: {
+            banner: {
+                sizes: [[300, 250], [300,600]]
+            }
+        },
+        bids: [{
+            bidder: 'colossusssp',
+            params: {
+                placement_id: 0,
+                traffic: 'banner'
+            }
+        }]
+    ];
 ```
diff --git a/test/spec/modules/colossussspBidAdapter_spec.js b/test/spec/modules/colossussspBidAdapter_spec.js
new file mode 100644
index 00000000000..150bcb72121
--- /dev/null
+++ b/test/spec/modules/colossussspBidAdapter_spec.js
@@ -0,0 +1,190 @@
+import {expect} from 'chai';
+import {spec} from '../../../modules/colossussspBidAdapter.js';
+
+describe('ColossussspAdapter', function () {
+  let bid = {
+    bidId: '2dd581a2b6281d',
+    bidder: 'colossusssp',
+    bidderRequestId: '145e1d6a7837c9',
+    params: {
+      placement_id: 0
+    },
+    placementCode: 'placementid_0',
+    auctionId: '74f78609-a92d-4cf1-869f-1b244bbfb5d2',
+    mediaTypes: {
+      banner: {
+        sizes: [[300, 250]]
+      }
+    },
+    transactionId: '3bb2f6da-87a6-4029-aeb0-bfe951372e62',
+    schain: {
+      ver: '1.0',
+      complete: 1,
+      nodes: [
+        {
+          asi: 'example.com',
+          sid: '0',
+          hp: 1,
+          rid: 'bidrequestid',
+          // name: 'alladsallthetime',
+          domain: 'example.com'
+        }
+      ]
+    }
+  };
+  let bidderRequest = {
+    bidderCode: 'colossus',
+    auctionId: 'fffffff-ffff-ffff-ffff-ffffffffffff',
+    bidderRequestId: 'ffffffffffffff',
+    start: 1472239426002,
+    auctionStart: 1472239426000,
+    timeout: 5000,
+    uspConsent: '1YN-',
+    refererInfo: {
+      referer: 'http://www.example.com',
+      reachedTop: true,
+    },
+    bids: [bid]
+  }
+
+  describe('isBidRequestValid', function () {
+    it('Should return true when placement_id can be cast to a number', function () {
+      expect(spec.isBidRequestValid(bid)).to.be.true;
+    });
+    it('Should return false when placement_id is not a number', function () {
+      bid.params.placement_id = 'aaa';
+      expect(spec.isBidRequestValid(bid)).to.be.false;
+    });
+  });
+
+  describe('buildRequests', function () {
+    let serverRequest = spec.buildRequests([bid], bidderRequest);
+    it('Creates a ServerRequest object with method, URL and data', function () {
+      expect(serverRequest).to.exist;
+      expect(serverRequest.method).to.exist;
+      expect(serverRequest.url).to.exist;
+      expect(serverRequest.data).to.exist;
+    });
+    it('Returns POST method', function () {
+      expect(serverRequest.method).to.equal('POST');
+    });
+    it('Returns valid URL', function () {
+      expect(serverRequest.url).to.equal('https://colossusssp.com/?c=o&m=multi');
+    });
+    it('Should contain ccpa', function() {
+      expect(serverRequest.data.ccpa).to.be.an('string')
+    })
+
+    it('Returns valid data if array of bids is valid', function () {
+      let data = serverRequest.data;
+      expect(data).to.be.an('object');
+      expect(data).to.have.all.keys('deviceWidth', 'deviceHeight', 'language', 'secure', 'host', 'page', 'placements', 'ccpa');
+      expect(data.deviceWidth).to.be.a('number');
+      expect(data.deviceHeight).to.be.a('number');
+      expect(data.language).to.be.a('string');
+      expect(data.secure).to.be.within(0, 1);
+      expect(data.host).to.be.a('string');
+      expect(data.page).to.be.a('string');
+      let placements = data['placements'];
+      for (let i = 0; i < placements.length; i++) {
+        let placement = placements[i];
+        expect(placement).to.have.all.keys('placementId', 'eids', 'bidId', 'traffic', 'sizes', 'schain', 'floor');
+        expect(placement.schain).to.be.an('object')
+        expect(placement.placementId).to.be.a('number');
+        expect(placement.bidId).to.be.a('string');
+        expect(placement.traffic).to.be.a('string');
+        expect(placement.sizes).to.be.an('array');
+        expect(placement.floor).to.be.an('object');
+      }
+    });
+    it('Returns empty data if no valid requests are passed', function () {
+      serverRequest = spec.buildRequests([]);
+      let data = serverRequest.data;
+      expect(data.placements).to.be.an('array').that.is.empty;
+    });
+  });
+
+  describe('buildRequests with user ids', function () {
+    bid.userId = {}
+    bid.userId.britepoolid = 'britepoolid123';
+    bid.userId.idl_env = 'idl_env123';
+    bid.userId.tdid = 'tdid123';
+    bid.userId.id5id = { uid: 'id5id123' };
+    let serverRequest = spec.buildRequests([bid], bidderRequest);
+    it('Returns valid data if array of bids is valid', function () {
+      let data = serverRequest.data;
+      let placements = data['placements'];
+      expect(data).to.be.an('object');
+      for (let i = 0; i < placements.length; i++) {
+        let placement = placements[i];
+        expect(placement).to.have.property('eids')
+        expect(placement.eids).to.be.an('array')
+        expect(placement.eids.length).to.be.equal(4)
+        for (let index in placement.eids) {
+          let v = placement.eids[index];
+          expect(v).to.have.all.keys('source', 'uids')
+          expect(v.source).to.be.oneOf(['britepool.com', 'identityLink', 'adserver.org', 'id5-sync.com'])
+          expect(v.uids).to.be.an('array');
+          expect(v.uids.length).to.be.equal(1)
+          expect(v.uids[0]).to.have.property('id')
+        }
+      }
+    });
+  });
+
+  describe('interpretResponse', function () {
+    let resObject = {
+      body: [ {
+        requestId: '123',
+        mediaType: 'banner',
+        cpm: 0.3,
+        width: 320,
+        height: 50,
+        ad: '<h1>Hello ad</h1>',
+        ttl: 1000,
+        creativeId: '123asd',
+        netRevenue: true,
+        currency: 'USD',
+        meta: {
+          advertiserDomains: ['google.com'],
+          advertiserId: 1234
+        }
+      } ]
+    };
+    let serverResponses = spec.interpretResponse(resObject);
+    it('Returns an array of valid server responses if response object is valid', function () {
+      expect(serverResponses).to.be.an('array').that.is.not.empty;
+      for (let i = 0; i < serverResponses.length; i++) {
+        let dataItem = serverResponses[i];
+        expect(dataItem).to.have.all.keys('requestId', 'cpm', 'width', 'height', 'ad', 'ttl', 'creativeId',
+          'netRevenue', 'currency', 'mediaType', 'meta');
+        expect(dataItem.requestId).to.be.a('string');
+        expect(dataItem.cpm).to.be.a('number');
+        expect(dataItem.width).to.be.a('number');
+        expect(dataItem.height).to.be.a('number');
+        expect(dataItem.ad).to.be.a('string');
+        expect(dataItem.ttl).to.be.a('number');
+        expect(dataItem.creativeId).to.be.a('string');
+        expect(dataItem.netRevenue).to.be.a('boolean');
+        expect(dataItem.currency).to.be.a('string');
+        expect(dataItem.mediaType).to.be.a('string');
+        expect(dataItem.meta).to.be.an('object').that.has.any.key('advertiserDomains');
+      }
+      it('Returns an empty array if invalid response is passed', function () {
+        serverResponses = spec.interpretResponse('invalid_response');
+        expect(serverResponses).to.be.an('array').that.is.empty;
+      });
+    });
+  });
+
+  describe('getUserSyncs', function () {
+    let userSync = spec.getUserSyncs();
+    it('Returns valid URL and type', function () {
+      expect(userSync).to.be.an('array').with.lengthOf(1);
+      expect(userSync[0].type).to.exist;
+      expect(userSync[0].url).to.exist;
+      expect(userSync[0].type).to.be.equal('image');
+      expect(userSync[0].url).to.be.equal('https://colossusssp.com/?c=o&m=cookie');
+    });
+  });
+});