diff --git a/adapters/adnuntius/adnuntius.go b/adapters/adnuntius/adnuntius.go
index 829b6e823e4..a28ac669795 100644
--- a/adapters/adnuntius/adnuntius.go
+++ b/adapters/adnuntius/adnuntius.go
@@ -37,6 +37,11 @@ type siteExt struct {
 	Data interface{} `json:"data"`
 }
 
+type adnAdvertiser struct {
+	LegalName string `json:"legalName,omitempty"`
+	Name      string `json:"name,omitempty"`
+}
+
 type Ad struct {
 	Bid struct {
 		Amount   float64
@@ -56,6 +61,7 @@ type Ad struct {
 	LineItemId      string
 	Html            string
 	DestinationUrls map[string]string
+	Advertiser      adnAdvertiser `json:"advertiser,omitempty"`
 }
 
 type AdUnit struct {
@@ -369,6 +375,40 @@ func getGDPR(request *openrtb2.BidRequest) (string, string, error) {
 	return gdpr, consent, nil
 }
 
+func generateReturnExt(ad Ad, request *openrtb2.BidRequest) (json.RawMessage, error) {
+	// We always force the publisher to render
+	var adRender int8 = 0
+
+	var requestRegsExt *openrtb_ext.ExtRegs
+	if request.Regs != nil && request.Regs.Ext != nil {
+		if err := json.Unmarshal(request.Regs.Ext, &requestRegsExt); err != nil {
+
+			return nil, fmt.Errorf("Failed to parse Ext information in Adnuntius: %v", err)
+		}
+	}
+
+	if ad.Advertiser.Name != "" && requestRegsExt != nil && requestRegsExt.DSA != nil {
+		legalName := ad.Advertiser.Name
+		if ad.Advertiser.LegalName != "" {
+			legalName = ad.Advertiser.LegalName
+		}
+		ext := &openrtb_ext.ExtBid{
+			DSA: &openrtb_ext.ExtBidDSA{
+				AdRender: &adRender,
+				Paid:     legalName,
+				Behalf:   legalName,
+			},
+		}
+		returnExt, err := json.Marshal(ext)
+		if err != nil {
+			return nil, fmt.Errorf("Failed to parse Ext information in Adnuntius: %v", err)
+		}
+
+		return returnExt, nil
+	}
+	return nil, nil
+}
+
 func generateAdResponse(ad Ad, imp openrtb2.Imp, html string, request *openrtb2.BidRequest) (*openrtb2.Bid, []error) {
 
 	creativeWidth, widthErr := strconv.ParseInt(ad.CreativeWidth, 10, 64)
@@ -410,6 +450,13 @@ func generateAdResponse(ad Ad, imp openrtb2.Imp, html string, request *openrtb2.
 		}
 	}
 
+	extJson, err := generateReturnExt(ad, request)
+	if err != nil {
+		return nil, []error{&errortypes.BadInput{
+			Message: fmt.Sprintf("Error extracting Ext: %s", err.Error()),
+		}}
+	}
+
 	adDomain := []string{}
 	for _, url := range ad.DestinationUrls {
 		domainArray := strings.Split(url, "/")
@@ -429,6 +476,7 @@ func generateAdResponse(ad Ad, imp openrtb2.Imp, html string, request *openrtb2.
 		Price:   price * 1000,
 		AdM:     html,
 		ADomain: adDomain,
+		Ext:     extJson,
 	}
 	return &bid, nil
 
diff --git a/adapters/adnuntius/adnuntiustest/supplemental/check-dsa-advertiser-legalName-omitted.json b/adapters/adnuntius/adnuntiustest/supplemental/check-dsa-advertiser-legalName-omitted.json
new file mode 100644
index 00000000000..0b44aa16dca
--- /dev/null
+++ b/adapters/adnuntius/adnuntiustest/supplemental/check-dsa-advertiser-legalName-omitted.json
@@ -0,0 +1,133 @@
+{
+	"mockBidRequest": {
+		"id": "test-request-id",
+		"user": {
+			"id": "1kjh3429kjh295jkl"
+		},
+		"site": {
+			"ext":{
+				"data" : {
+					"key": ["value"]
+				}
+			}
+		},
+		"regs": {
+			"ext": {
+				"dsa": {
+					"dsarequired": 3,
+					"datatopub": 1
+				}
+			}
+		},
+		"imp": [
+			{
+				"id": "test-imp-id",
+				"banner": {
+					"format": [
+						{
+							"w": 300,
+							"h": 250
+						},
+						{
+							"w": 300,
+							"h": 600
+						}
+					]
+				},
+				"ext": {
+					"bidder": {
+						"auId": "123"
+					}
+				}
+			}
+		]
+	},
+	"httpCalls": [
+		{
+			"expectedRequest": {
+				"uri": "http://whatever.url?format=prebid&tzo=0",
+				"body": {
+					"adUnits": [
+						{
+							"auId": "123",
+							"targetId": "123-test-imp-id",
+							"dimensions": [[300,250],[300,600]]
+						}
+					],
+					"kv": {
+						"key": ["value"]
+					},
+					"metaData": {
+						"usi": "1kjh3429kjh295jkl"
+					},
+					"context": "unknown"
+				},
+				"impIDs":["test-imp-id"]
+			},
+			"mockResponse": {
+				"status": 200,
+				"body": {
+					"adUnits": [
+						{
+							"auId": "0000000000000123",
+							"targetId": "123-test-imp-id",
+							"html": "<ADCODE>",
+							"responseId": "adn-rsp-900646517",
+							"ads": [
+								{
+									"destinationUrls": {
+										"url": "http://www.google.com"
+									},
+									"bid": {
+										"amount": 20.0,
+										"currency": "NOK"
+									},
+									"adId": "adn-id-1559784094",
+									"creativeWidth": "980",
+									"creativeHeight": "240",
+									"creativeId": "jn9hpzvlsf8cpdmm",
+									"lineItemId": "q7y9qm5b0xt9htrv",
+									"advertiser": {
+										"name": "Name"
+									}
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	],
+	"expectedBidResponses": [
+		{
+			"bids": [
+				{
+					"bid": {
+						"id": "adn-id-1559784094",
+						"impid": "test-imp-id",
+						"price": 20000,
+						"adm": "<ADCODE>",
+						"adid": "adn-id-1559784094",
+						"adomain": [
+							"google.com"
+						],
+						"cid": "q7y9qm5b0xt9htrv",
+						"crid": "jn9hpzvlsf8cpdmm",
+						"w": 980,
+						"h": 240,
+						"ext": {
+							"dsa": {
+								"paid": "Name",
+								"behalf": "Name",
+								"adrender": 0
+							}
+						}
+					},
+					"type": "banner"
+					
+				}
+			],
+			"currency": "NOK"
+		}
+	]
+}
\ No newline at end of file
diff --git a/adapters/adnuntius/adnuntiustest/supplemental/check-dsa-advertiser-legalName.json b/adapters/adnuntius/adnuntiustest/supplemental/check-dsa-advertiser-legalName.json
new file mode 100644
index 00000000000..7999bd476aa
--- /dev/null
+++ b/adapters/adnuntius/adnuntiustest/supplemental/check-dsa-advertiser-legalName.json
@@ -0,0 +1,134 @@
+{
+	"mockBidRequest": {
+		"id": "test-request-id",
+		"user": {
+			"id": "1kjh3429kjh295jkl"
+		},
+		"site": {
+			"ext":{
+				"data" : {
+					"key": ["value"]
+				}
+			}
+		},
+		"regs": {
+			"ext": {
+				"dsa": {
+					"dsarequired": 3,
+					"datatopub": 1
+				}
+			}
+		},
+		"imp": [
+			{
+				"id": "test-imp-id",
+				"banner": {
+					"format": [
+						{
+							"w": 300,
+							"h": 250
+						},
+						{
+							"w": 300,
+							"h": 600
+						}
+					]
+				},
+				"ext": {
+					"bidder": {
+						"auId": "123"
+					}
+				}
+			}
+		]
+	},
+	"httpCalls": [
+		{
+			"expectedRequest": {
+				"uri": "http://whatever.url?format=prebid&tzo=0",
+				"body": {
+					"adUnits": [
+						{
+							"auId": "123",
+							"targetId": "123-test-imp-id",
+							"dimensions": [[300,250],[300,600]]
+						}
+					],
+					"kv": {
+						"key": ["value"]
+					},
+					"metaData": {
+						"usi": "1kjh3429kjh295jkl"
+					},
+					"context": "unknown"
+				},
+				"impIDs":["test-imp-id"]
+			},
+			"mockResponse": {
+				"status": 200,
+				"body": {
+					"adUnits": [
+						{
+							"auId": "0000000000000123",
+							"targetId": "123-test-imp-id",
+							"html": "<ADCODE>",
+							"responseId": "adn-rsp-900646517",
+							"ads": [
+								{
+									"destinationUrls": {
+										"url": "http://www.google.com"
+									},
+									"bid": {
+										"amount": 20.0,
+										"currency": "NOK"
+									},
+									"adId": "adn-id-1559784094",
+									"creativeWidth": "980",
+									"creativeHeight": "240",
+									"creativeId": "jn9hpzvlsf8cpdmm",
+									"lineItemId": "q7y9qm5b0xt9htrv",
+									"advertiser": {
+										"name": "Name",
+										"legalName": "LegalName"
+									}
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	],
+	"expectedBidResponses": [
+		{
+			"bids": [
+				{
+					"bid": {
+						"id": "adn-id-1559784094",
+						"impid": "test-imp-id",
+						"price": 20000,
+						"adm": "<ADCODE>",
+						"adid": "adn-id-1559784094",
+						"adomain": [
+							"google.com"
+						],
+						"cid": "q7y9qm5b0xt9htrv",
+						"crid": "jn9hpzvlsf8cpdmm",
+						"w": 980,
+						"h": 240,
+						"ext": {
+							"dsa": {
+								"paid": "LegalName",
+								"behalf": "LegalName",
+								"adrender": 0
+							}
+						}
+					},
+					"type": "banner"
+					
+				}
+			],
+			"currency": "NOK"
+		}
+	]
+}
\ No newline at end of file
diff --git a/adapters/adnuntius/adnuntiustest/supplemental/check-dsa-advertiser-omitted.json b/adapters/adnuntius/adnuntiustest/supplemental/check-dsa-advertiser-omitted.json
new file mode 100644
index 00000000000..11cea9bcf66
--- /dev/null
+++ b/adapters/adnuntius/adnuntiustest/supplemental/check-dsa-advertiser-omitted.json
@@ -0,0 +1,123 @@
+{
+	"mockBidRequest": {
+		"id": "test-request-id",
+		"user": {
+			"id": "1kjh3429kjh295jkl"
+		},
+		"site": {
+			"ext":{
+				"data" : {
+					"key": ["value"]
+				}
+			}
+		},
+		"regs": {
+			"ext": {
+				"dsa": {
+					"dsarequired": 3,
+					"datatopub": 1
+				}
+			}
+		},
+		"imp": [
+			{
+				"id": "test-imp-id",
+				"banner": {
+					"format": [
+						{
+							"w": 300,
+							"h": 250
+						},
+						{
+							"w": 300,
+							"h": 600
+						}
+					]
+				},
+				"ext": {
+					"bidder": {
+						"auId": "123"
+					}
+				}
+			}
+		]
+	},
+	"httpCalls": [
+		{
+			"expectedRequest": {
+				"uri": "http://whatever.url?format=prebid&tzo=0",
+				"body": {
+					"adUnits": [
+						{
+							"auId": "123",
+							"targetId": "123-test-imp-id",
+							"dimensions": [[300,250],[300,600]]
+						}
+					],
+					"kv": {
+						"key": ["value"]
+					},
+					"metaData": {
+						"usi": "1kjh3429kjh295jkl"
+					},
+					"context": "unknown"
+				},
+				"impIDs":["test-imp-id"]
+			},
+			"mockResponse": {
+				"status": 200,
+				"body": {
+					"adUnits": [
+						{
+							"auId": "0000000000000123",
+							"targetId": "123-test-imp-id",
+							"html": "<ADCODE>",
+							"responseId": "adn-rsp-900646517",
+							"ads": [
+								{
+									"destinationUrls": {
+										"url": "http://www.google.com"
+									},
+									"bid": {
+										"amount": 20.0,
+										"currency": "NOK"
+									},
+									"adId": "adn-id-1559784094",
+									"creativeWidth": "980",
+									"creativeHeight": "240",
+									"creativeId": "jn9hpzvlsf8cpdmm",
+									"lineItemId": "q7y9qm5b0xt9htrv"
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	],
+	"expectedBidResponses": [
+		{
+			"bids": [
+				{
+					"bid": {
+						"id": "adn-id-1559784094",
+						"impid": "test-imp-id",
+						"price": 20000,
+						"adm": "<ADCODE>",
+						"adid": "adn-id-1559784094",
+						"adomain": [
+							"google.com"
+						],
+						"cid": "q7y9qm5b0xt9htrv",
+						"crid": "jn9hpzvlsf8cpdmm",
+						"w": 980,
+						"h": 240
+					},
+					"type": "banner"
+					
+				}
+			],
+			"currency": "NOK"
+		}
+	]
+}
\ No newline at end of file
diff --git a/adapters/adnuntius/adnuntiustest/supplemental/invalid-regs-ext.json b/adapters/adnuntius/adnuntiustest/supplemental/invalid-regs-ext.json
new file mode 100644
index 00000000000..bf0365f60a9
--- /dev/null
+++ b/adapters/adnuntius/adnuntiustest/supplemental/invalid-regs-ext.json
@@ -0,0 +1,46 @@
+{
+	"mockBidRequest": {
+		"id": "test-request-id",
+		"user": {
+			"id": "1kjh3429kjh295jkl"
+		},
+		"site": {
+			"ext":{
+				"data" : {
+					"key": ["value"]
+				}
+			}
+		},
+		"regs": {
+			"ext": ""
+		},
+		"imp": [
+			{
+				"id": "test-imp-id",
+				"banner": {
+					"format": [
+						{
+							"w": 300,
+							"h": 250
+						},
+						{
+							"w": 300,
+							"h": 600
+						}
+					]
+				},
+				"ext": {
+					"bidder": {
+						"auId": "123"
+					}
+				}
+			}
+		]
+	},
+	"expectedMakeRequestsErrors": [
+		{
+			"value": "failed to parse URL: [failed to parse Adnuntius endpoint: failed to parse ExtRegs in Adnuntius GDPR check: json: cannot unmarshal string into Go value of type openrtb_ext.ExtRegs]",
+			"comparison": "literal"
+		}
+	]
+}