diff --git a/modules/rasBidAdapter.js b/modules/rasBidAdapter.js
index 909b6a7b795..7bc3cf66b0d 100644
--- a/modules/rasBidAdapter.js
+++ b/modules/rasBidAdapter.js
@@ -1,3 +1,4 @@
+import * as utils from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { BANNER } from '../src/mediaTypes.js';
 import { isEmpty, getAdUnitSizes, parseSizesInput, deepAccess } from '../src/utils.js';
@@ -92,11 +93,18 @@ const getSlots = (bidRequests) => {
   const batchSize = bidRequests.length;
   for (let i = 0; i < batchSize; i++) {
     const adunit = bidRequests[i];
+    const slotSequence = utils.deepAccess(adunit, 'params.slotSequence');
+
     const sizes = parseSizesInput(getAdUnitSizes(adunit)).join(',');
+
     queryString += `&slot${i}=${encodeURIComponent(adunit.params.slot)}&id${i}=${encodeURIComponent(adunit.bidId)}&composition${i}=CHILD`;
+
     if (sizes.length) {
       queryString += `&iusizes${i}=${encodeURIComponent(sizes)}`;
     }
+    if (slotSequence !== undefined) {
+      queryString += `&pos${i}=${encodeURIComponent(slotSequence)}`;
+    }
   }
   return queryString;
 };
diff --git a/modules/rasBidAdapter.md b/modules/rasBidAdapter.md
index 5cf75c3446d..384ba0b611f 100644
--- a/modules/rasBidAdapter.md
+++ b/modules/rasBidAdapter.md
@@ -34,17 +34,18 @@ var adUnits = [{
 
 # Parameters
 
-| Name | Scope | Type | Description | Example
-| --- | --- | --- | --- | ---
-| network | required | String | Specific identifier provided by RAS | `"4178463"`
-| site | required | String | Specific identifier name (case-insensitive) that is associated with this ad unit and provided by RAS | `"example_com"`
-| area | required | String | Ad unit category name; only case-insensitive alphanumeric with underscores and hyphens are allowed | `"sport"`
-| slot | required | String | Ad unit placement name (case-insensitive) provided by RAS | `"slot"`
-| pageContext | optional | Object | Web page context data | `{}`
-| pageContext.dr | optional | String | Document referrer URL address | `"https://example.com/"`
-| pageContext.du | optional | String | Document URL address | `"https://example.com/sport/football/article.html?id=932016a5-02fc-4d5c-b643-fafc2f270f06"`
+| Name | Scope | Type | Description                                                                                                                                                                                                                                                               | Example
+| --- | --- | --- |---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| ---
+| network | required | String | Specific identifier provided by RAS                                                                                                                                                                                                                                       | `"4178463"`
+| site | required | String | Specific identifier name (case-insensitive) that is associated with this ad unit and provided by RAS                                                                                                                                                                      | `"example_com"`
+| area | required | String | Ad unit category name; only case-insensitive alphanumeric with underscores and hyphens are allowed                                                                                                                                                                        | `"sport"`
+| slot | required | String | Ad unit placement name (case-insensitive) provided by RAS                                                                                                                                                                                                                 | `"slot"`
+| slotSequence  | optional | Number | Ad unit sequence position provided by RAS                                                                                                                                                                                                                            | `1`
+| pageContext | optional | Object | Web page context data                                                                                                                                                                                                                                                     | `{}`
+| pageContext.dr | optional | String | Document referrer URL address                                                                                                                                                                                                                                             | `"https://example.com/"`
+| pageContext.du | optional | String | Document URL address                                                                                                                                                                                                                                                      | `"https://example.com/sport/football/article.html?id=932016a5-02fc-4d5c-b643-fafc2f270f06"`
 | pageContext.dv | optional | String | Document virtual address as slash-separated path that may consist of any number of parts (case-insensitive alphanumeric with underscores and hyphens); first part should be the same as `site` value and second as `area` value; next parts may reflect website navigation | `"example_com/sport/football"`
-| pageContext.keyWords | optional | String[] | List of keywords associated with this ad unit; only case-insensitive alphanumeric with underscores and hyphens are allowed | `["euro", "lewandowski"]`
-| pageContext.keyValues | optional | Object | Key-values associated with this ad unit (case-insensitive); following characters are not allowed in the values: `" ' = ! + # * ~ ; ^ ( ) < > [ ] & @` | `{}`
-| pageContext.keyValues.ci | optional | String | Content unique identifier | `"932016a5-02fc-4d5c-b643-fafc2f270f06"`
-| pageContext.keyValues.adunit | optional | String | Ad unit name | `"example_com/sport"`
+| pageContext.keyWords | optional | String[] | List of keywords associated with this ad unit; only case-insensitive alphanumeric with underscores and hyphens are allowed                                                                                                                                                | `["euro", "lewandowski"]`
+| pageContext.keyValues | optional | Object | Key-values associated with this ad unit (case-insensitive); following characters are not allowed in the values: `" ' = ! + # * ~ ; ^ ( ) < > [ ] & @`                                                                                                                     | `{}`
+| pageContext.keyValues.ci | optional | String | Content unique identifier                                                                                                                                                                                                                                                 | `"932016a5-02fc-4d5c-b643-fafc2f270f06"`
+| pageContext.keyValues.adunit | optional | String | Ad unit name                                                                                                                                                                                                                                                              | `"example_com/sport"`
diff --git a/test/spec/modules/rasBidAdapter_spec.js b/test/spec/modules/rasBidAdapter_spec.js
index 324bf782672..8c378aaa416 100644
--- a/test/spec/modules/rasBidAdapter_spec.js
+++ b/test/spec/modules/rasBidAdapter_spec.js
@@ -58,6 +58,7 @@ describe('rasBidAdapter', function () {
         slot: 'test',
         area: 'areatest',
         site: 'test',
+        slotSequence: '0',
         network: '4178463'
       }
     };
@@ -140,6 +141,7 @@ describe('rasBidAdapter', function () {
       expect(requests[0].url).to.have.string('DV=test%2Fareatest');
       expect(requests[0].url).to.have.string('kwrd=val1%2Bval2');
       expect(requests[0].url).to.have.string('kvadunit=test%2Fareatest');
+      expect(requests[0].url).to.have.string('pos0=0');
     });
   });