diff --git a/adapters/openx/openx.go b/adapters/openx/openx.go
index f10985f3085..992baa0cdc7 100644
--- a/adapters/openx/openx.go
+++ b/adapters/openx/openx.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"strconv"
 
 	"github.com/prebid/openrtb/v20/openrtb2"
 	"github.com/prebid/prebid-server/v3/adapters"
@@ -32,6 +33,12 @@ type openxRespExt struct {
 	FledgeAuctionConfigs map[string]json.RawMessage `json:"fledge_auction_configs,omitempty"`
 }
 
+type oxBidExt struct {
+	DspId   int    `json:"dsp_id,string,omitempty"`
+	BrandId int    `json:"brand_id,string,omitempty"`
+	BuyerId string `json:"buyer_id,omitempty"`
+}
+
 func (a *OpenxAdapter) MakeRequests(request *openrtb2.BidRequest, reqInfo *adapters.ExtraRequestInfo) ([]*adapters.RequestData, []error) {
 	var errs []error
 	var bannerAndNativeImps []openrtb2.Imp
@@ -238,6 +245,7 @@ func (a *OpenxAdapter) MakeBids(internalRequest *openrtb2.BidRequest, externalRe
 				Bid:      &sb.Bid[i],
 				BidType:  getBidType(sb.Bid[i].MType, sb.Bid[i].ImpID, internalRequest.Imp),
 				BidVideo: getBidVideo(&sb.Bid[i]),
+				BidMeta:  getBidMeta(&sb.Bid[i]),
 			})
 		}
 	}
@@ -298,3 +306,36 @@ func Builder(bidderName openrtb_ext.BidderName, config config.Adapter, server co
 	}
 	return bidder, nil
 }
+
+func getBidMeta(bid *openrtb2.Bid) *openrtb_ext.ExtBidPrebidMeta {
+	if bid.Ext == nil {
+		return nil
+	}
+
+	var ext *oxBidExt
+	if err := jsonutil.Unmarshal(bid.Ext, &ext); err != nil {
+		return nil
+	}
+
+	buyerId := getBuyerIdFromExt(ext)
+	if buyerId <= 0 && ext.DspId <= 0 && ext.BrandId <= 0 {
+		return nil
+	}
+
+	return &openrtb_ext.ExtBidPrebidMeta{
+		NetworkID:    ext.DspId,
+		AdvertiserID: buyerId,
+		BrandID:      ext.BrandId,
+	}
+}
+
+func getBuyerIdFromExt(ext *oxBidExt) int {
+	if ext.BuyerId == "" {
+		return 0
+	}
+	buyerId, err := strconv.Atoi(ext.BuyerId)
+	if err != nil {
+		return 0
+	}
+	return buyerId
+}
diff --git a/adapters/openx/openx_test.go b/adapters/openx/openx_test.go
index 092e9190f90..fdfb37cc4a0 100644
--- a/adapters/openx/openx_test.go
+++ b/adapters/openx/openx_test.go
@@ -2,6 +2,7 @@ package openx
 
 import (
 	"encoding/json"
+	"net/http"
 	"testing"
 
 	"github.com/prebid/openrtb/v20/openrtb2"
@@ -33,6 +34,119 @@ func TestResponseWithCurrencies(t *testing.T) {
 	assertCurrencyInBidResponse(t, "EUR", &currency)
 }
 
+func TestOpenxAdapter_GetBidMeta(t *testing.T) {
+	testCases := []struct {
+		bid          *openrtb2.Bid
+		expectedMeta *openrtb_ext.ExtBidPrebidMeta
+	}{
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`malformed`)},
+			nil,
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{}`)},
+			nil,
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"dsp_id":"456","brand_id":"789","buyer_id":"123"}`)},
+			&openrtb_ext.ExtBidPrebidMeta{AdvertiserID: 123, NetworkID: 456, BrandID: 789},
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"dsp_id":"456","brand_id":"malformed","buyer_id":"123"}`)},
+			nil,
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"dsp_id":"456","brand_id":"789","buyer_id":"123-456"}`)},
+			&openrtb_ext.ExtBidPrebidMeta{AdvertiserID: 0, NetworkID: 456, BrandID: 789},
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"buyer_id":"123","dsp_id":"456"}`)},
+			&openrtb_ext.ExtBidPrebidMeta{AdvertiserID: 123, NetworkID: 456, BrandID: 0},
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"buyer_id":"123","brand_id":"789"}`)},
+			&openrtb_ext.ExtBidPrebidMeta{AdvertiserID: 123, NetworkID: 0, BrandID: 789},
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"dsp_id":"456","brand_id":"789"}`)},
+			&openrtb_ext.ExtBidPrebidMeta{AdvertiserID: 0, NetworkID: 456, BrandID: 789},
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"buyer_id":"123"}`)},
+			&openrtb_ext.ExtBidPrebidMeta{AdvertiserID: 123, NetworkID: 0, BrandID: 0},
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"dsp_id":"456"}`)},
+			&openrtb_ext.ExtBidPrebidMeta{AdvertiserID: 0, NetworkID: 456, BrandID: 0},
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"brand_id":"789"}`)},
+			&openrtb_ext.ExtBidPrebidMeta{AdvertiserID: 0, NetworkID: 0, BrandID: 789},
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"buyer_id":"123","dsp_id":"456"}`)},
+			&openrtb_ext.ExtBidPrebidMeta{AdvertiserID: 123, NetworkID: 456, BrandID: 0},
+		},
+		{
+			&openrtb2.Bid{Ext: json.RawMessage(`{"buyer_id":"malformed","dsp_id":"malformed","brand_id":"malformed"}`)},
+			nil,
+		},
+	}
+
+	for _, testCase := range testCases {
+		updatedMeta := getBidMeta(testCase.bid)
+		assert.Equal(t, testCase.expectedMeta, updatedMeta)
+	}
+}
+
+func TestOpenxAdapter_MakeBids(t *testing.T) {
+	responseBody := `{"id":"test-request-id","seatbid":[{"seat":"openx","bid":[{"id":"all-buyer-ext","impid":"all-buyer-ext-imp-id","price":0.5,"adm":"some-test-ad","crid":"crid_10","ext":{"dsp_id":"123","brand_id":"456","buyer_id":"789"},"h":90,"w":728,"mtype":1},{"id":"only-dspId","impid":"only-dspId-imp-id","price":0.6,"adm":"some-test-ad","crid":"crid_11","ext":{"dsp_id":"321"},"h":90,"w":728,"mtype":1}]}],"cur":"USD"}`
+	response := &adapters.ResponseData{
+		StatusCode: http.StatusOK,
+		Body:       []byte(responseBody),
+	}
+	adapter := &OpenxAdapter{bidderName: "", endpoint: ""}
+	bids, _ := adapter.MakeBids(&openrtb2.BidRequest{}, &adapters.RequestData{}, response)
+	expectedBidderResponse := adapters.BidderResponse{
+		Currency: "USD",
+		Bids: []*adapters.TypedBid{
+			{
+				Bid: &openrtb2.Bid{
+					ID:    "all-buyer-ext",
+					ImpID: "all-buyer-ext-imp-id",
+					Price: 0.5,
+					AdM:   "some-test-ad",
+					CrID:  "crid_10",
+					W:     728,
+					H:     90,
+					MType: 1,
+					Ext:   json.RawMessage(`{"dsp_id":"123","brand_id":"456","buyer_id":"789"}`),
+				},
+				BidMeta:  &openrtb_ext.ExtBidPrebidMeta{NetworkID: 123, BrandID: 456, AdvertiserID: 789},
+				BidType:  "banner",
+				BidVideo: &openrtb_ext.ExtBidPrebidVideo{Duration: 0, PrimaryCategory: ""},
+			},
+			{
+				Bid: &openrtb2.Bid{
+					ID:    "only-dspId",
+					ImpID: "only-dspId-imp-id",
+					Price: 0.6,
+					AdM:   "some-test-ad",
+					CrID:  "crid_11",
+					W:     728,
+					H:     90,
+					MType: 1,
+					Ext:   json.RawMessage(`{"dsp_id":"321"}`),
+				},
+				BidMeta:  &openrtb_ext.ExtBidPrebidMeta{NetworkID: 321},
+				BidType:  "banner",
+				BidVideo: &openrtb_ext.ExtBidPrebidVideo{Duration: 0, PrimaryCategory: ""},
+			},
+		},
+	}
+	assert.Equal(t, expectedBidderResponse, *bids)
+}
+
 func assertCurrencyInBidResponse(t *testing.T, expectedCurrency string, currency *string) {
 	bidder, buildErr := Builder(openrtb_ext.BidderOpenx, config.Adapter{
 		Endpoint: "http://rtb.openx.net/prebid"}, config.Server{ExternalUrl: "http://hosturl.com", GvlID: 1, DataCenter: "2"})