diff --git a/google/cloud/pubsub_v1/open_telemetry/subscribe_opentelemetry.py b/google/cloud/pubsub_v1/open_telemetry/subscribe_opentelemetry.py
index 6347b3963..f30cda5de 100644
--- a/google/cloud/pubsub_v1/open_telemetry/subscribe_opentelemetry.py
+++ b/google/cloud/pubsub_v1/open_telemetry/subscribe_opentelemetry.py
@@ -77,3 +77,14 @@ def add_subscribe_span_event(self, event: str) -> None:
                 "timestamp": str(datetime.now()),
             },
         )
+
+    def end_subscribe_span(self) -> None:
+        assert self._subscribe_span is not None
+        self._subscribe_span.end()
+
+    def set_subscribe_span_result(self, result: str) -> None:
+        assert self._subscribe_span is not None
+        self._subscribe_span.set_attribute(
+            key="messaging.gcp_pubsub.result",
+            value=result,
+        )
diff --git a/google/cloud/pubsub_v1/subscriber/_protocol/dispatcher.py b/google/cloud/pubsub_v1/subscriber/_protocol/dispatcher.py
index 15ad4abb3..fc5193555 100644
--- a/google/cloud/pubsub_v1/subscriber/_protocol/dispatcher.py
+++ b/google/cloud/pubsub_v1/subscriber/_protocol/dispatcher.py
@@ -243,6 +243,12 @@ def ack(self, items: Sequence[requests.AckRequest]) -> None:
                 ack_reqs_dict=ack_reqs_dict,
             )
 
+            for completed_ack in requests_completed:
+                if completed_ack.opentelemetry_data:
+                    completed_ack.opentelemetry_data.set_subscribe_span_result("acked")
+                    completed_ack.opentelemetry_data.add_subscribe_span_event("ack end")
+                    completed_ack.opentelemetry_data.end_subscribe_span()
+
             # Remove the completed messages from lease management.
             self.drop(requests_completed)
 
@@ -286,6 +292,13 @@ def _retry_acks(self, requests_to_retry):
                 ack_ids=[req.ack_id for req in requests_to_retry],
                 ack_reqs_dict=ack_reqs_dict,
             )
+
+            for completed_ack in requests_completed:
+                if completed_ack.opentelemetry_data:
+                    completed_ack.opentelemetry_data.set_subscribe_span_result("acked")
+                    completed_ack.opentelemetry_data.add_subscribe_span_event("ack end")
+                    completed_ack.opentelemetry_data.end_subscribe_span()
+
             assert (
                 len(requests_to_retry) <= _ACK_IDS_BATCH_SIZE
             ), "Too many requests to be retried."