diff --git a/modules/equativBidAdapter.js b/modules/equativBidAdapter.js
index 64b61275272..0f6648fc509 100644
--- a/modules/equativBidAdapter.js
+++ b/modules/equativBidAdapter.js
@@ -18,8 +18,10 @@ const DEFAULT_TTL = 300;
 const LOG_PREFIX = 'Equativ:';
 const PID_STORAGE_NAME = 'eqt_pid';
 
-let nwid = 0;
+let feedbackArray = [];
 let impIdMap = {};
+let nwid = 0;
+let tokens = {};
 
 /**
  * Assigns values to new properties, removes temporary ones from an object
@@ -97,6 +99,36 @@ function makeId() {
   return str;
 }
 
+/**
+ * Updates bid request with data from previous auction
+ * @param {*} req A bid request object to be updated
+ * @returns {*} Updated bid request object
+ */
+function updateFeedbackData(req) {
+  if (req?.ext?.prebid?.previousauctioninfo) {
+    req.ext.prebid.previousauctioninfo.forEach(info => {
+      if (tokens[info?.bidId]) {
+        feedbackArray.push({
+          feedback_token: tokens[info.bidId],
+          loss: info.bidderCpm == info.highestBidCpm ? 0 : 102,
+          price: info.highestBidCpm
+        });
+
+        delete tokens[info.bidId];
+      }
+    });
+
+    delete req.ext.prebid;
+  }
+
+  if (feedbackArray.length) {
+    deepSetValue(req, 'ext.bid_feedback', feedbackArray[0]);
+    feedbackArray.shift();
+  }
+
+  return req;
+}
+
 export const storage = getStorageManager({ bidderCode: BIDDER_CODE });
 
 export const spec = {
@@ -122,7 +154,7 @@ export const spec = {
       requests.push({
         data,
         method: 'POST',
-        url: 'https://ssb-global.smartadserver.com/api/bid?callerId=169',
+        url: 'https://ssb-global.smartadserver.com/api/bid?callerId=169'
       })
     });
 
@@ -145,6 +177,11 @@ export const spec = {
         .forEach(seat =>
           seat.bid.forEach(bid => {
             bid.impid = impIdMap[bid.impid];
+
+            if (deepAccess(bid, 'ext.feedback_token')) {
+              tokens[bid.impid] = bid.ext.feedback_token;
+            }
+
             bid.ttl = typeof bid.exp === 'number' && bid.exp > 0 ? bid.exp : DEFAULT_TTL;
           })
         );
@@ -278,7 +315,7 @@ export const converter = ortbConverter({
       });
     });
 
-    const req = buildRequest(splitImps, bidderRequest, context);
+    let req = buildRequest(splitImps, bidderRequest, context);
 
     let env = ['ortb2.site.publisher', 'ortb2.app.publisher', 'ortb2.dooh.publisher'].find(propPath => deepAccess(bid, propPath)) || 'ortb2.site.publisher';
     nwid = deepAccess(bid, env + '.id') || bid.params.networkId;
@@ -292,7 +329,7 @@ export const converter = ortbConverter({
       if (deepAccess(bid, path)) {
         props.forEach(prop => {
           if (!deepAccess(bid, `${path}.${prop}`)) {
-            logWarn(`${LOG_PREFIX} Property "${path}.${prop}" is missing from request.  Request will proceed, but the use of "${prop}" is strongly encouraged.`, bid);
+            logWarn(`${LOG_PREFIX} Property "${path}.${prop}" is missing from request. Request will proceed, but the use of "${prop}" is strongly encouraged.`, bid);
           }
         });
       }
@@ -303,6 +340,8 @@ export const converter = ortbConverter({
       deepSetValue(req, 'user.buyeruid', pid);
     }
 
+    req = updateFeedbackData(req);
+
     return req;
   }
 });
diff --git a/test/spec/modules/equativBidAdapter_spec.js b/test/spec/modules/equativBidAdapter_spec.js
index d27112edfed..32f5c05077f 100644
--- a/test/spec/modules/equativBidAdapter_spec.js
+++ b/test/spec/modules/equativBidAdapter_spec.js
@@ -748,7 +748,142 @@ describe('Equativ bid adapter tests', () => {
         expect(secondImp).to.not.have.property('native');
         expect(secondImp).to.have.property('video');
       }
-    })
+    });
+
+    it('should not send ext.prebid', () => {
+      const request = spec.buildRequests(
+        DEFAULT_BANNER_BID_REQUESTS,
+        {
+          ...DEFAULT_BANNER_BIDDER_REQUEST,
+          ortb2: {
+            ext: {
+              prebid: {
+                previousauctioninfo: [
+                  {
+                    bidId: 'abcd1234',
+                    bidderCpm: 5,
+                    highestBidCpm: 6
+                  }
+                ]
+              }
+            }
+          }
+        }
+      )[0];
+      expect(request.data.ext).not.to.have.property('prebid');
+    });
+
+    it('should send feedback data when lost', () => {
+      const bidId = 'abcd1234';
+      const cpm = 3.7;
+      const impIdMap = getImpIdMap();
+      const token = 'y7hd87dw8';
+      const RESPONSE_WITH_FEEDBACK = {
+        body: {
+          seatbid: [
+            {
+              bid: [
+                {
+                  ext: {
+                    feedback_token: token
+                  },
+                  impid: Object.keys(impIdMap).find(key => impIdMap[key] === bidId)
+                }
+              ]
+            }
+          ]
+        }
+      };
+
+      let request = spec.buildRequests(
+        DEFAULT_BANNER_BID_REQUESTS,
+        DEFAULT_BANNER_BIDDER_REQUEST
+      )[0];
+
+      spec.interpretResponse(RESPONSE_WITH_FEEDBACK, request);
+
+      request = spec.buildRequests(
+        DEFAULT_BANNER_BID_REQUESTS,
+        {
+          ...DEFAULT_BANNER_BIDDER_REQUEST,
+          ortb2: {
+            ext: {
+              prebid: {
+                previousauctioninfo: [
+                  {
+                    bidId,
+                    bidderCpm: 2.41,
+                    highestBidCpm: cpm
+                  }
+                ]
+              }
+            }
+          }
+        }
+      )[0];
+
+      expect(request.data.ext).to.have.property('bid_feedback').and.to.deep.equal({
+        feedback_token: token,
+        loss: 102,
+        price: cpm
+      });
+    });
+
+    it('should send feedback data when won', () => {
+      const bidId = 'abcd1234';
+      const cpm = 2.34;
+      const impIdMap = getImpIdMap();
+      const token = '87187y83';
+      const RESPONSE_WITH_FEEDBACK = {
+        body: {
+          seatbid: [
+            {
+              bid: [
+                {
+                  ext: {
+                    feedback_token: token
+                  },
+                  impid: Object.keys(impIdMap).find(key => impIdMap[key] === bidId)
+                }
+              ]
+            }
+          ]
+        }
+      };
+
+      let request = spec.buildRequests(
+        DEFAULT_BANNER_BID_REQUESTS,
+        DEFAULT_BANNER_BIDDER_REQUEST
+      )[0];
+
+      spec.interpretResponse(RESPONSE_WITH_FEEDBACK, request);
+
+      request = spec.buildRequests(
+        DEFAULT_BANNER_BID_REQUESTS,
+        {
+          ...DEFAULT_BANNER_BIDDER_REQUEST,
+          ortb2: {
+            ext: {
+              prebid: {
+                previousauctioninfo: [
+                  {
+                    bidId,
+                    bidderCpm: 2.34,
+                    highestBidCpm: cpm
+                  }
+                ]
+              }
+            }
+          }
+        }
+      )[0];
+
+      expect(request.data.ext).to.have.property('bid_feedback').and.to.deep.equal({
+        feedback_token: token,
+        loss: 0,
+        price: cpm
+      });
+    });
   });
 
   describe('getUserSyncs', () => {