diff --git a/src/dynavec/stores/s3vectors.py b/src/dynavec/stores/s3vectors.py
index 6ca25a7..79a0232 100644
--- a/src/dynavec/stores/s3vectors.py
+++ b/src/dynavec/stores/s3vectors.py
@@ -11,6 +11,7 @@
 import logging
 import time
 from collections.abc import Iterator
+from concurrent.futures import ThreadPoolExecutor, as_completed
 from typing import Any
 
 import numpy as np
@@ -65,19 +66,31 @@ def _put_batch(self, payload: list[dict]) -> None:
             vectors=payload,
         )
 
+
     def put_vectors(
         self,
         vectors: list[tuple[str, list[float], Metadata]],
+        max_workers: int = 8,
     ) -> None:
-        """Insert/overwrite (key, vector, filterable_metadata) triples."""
+        """Insert/overwrite (key, vector, filterable_metadata) triples in parallelized batches."""
+        if not vectors:
+            return
+
         t0 = time.perf_counter()
-        for start in range(0, len(vectors), _PUT_LIMIT):
-            chunk = vectors[start : start + _PUT_LIMIT]
+        chunks = [vectors[i : i + _PUT_LIMIT] for i in range(0, len(vectors), _PUT_LIMIT)]
+
+        def _upload_chunk(chunk: list[tuple[str, list[float], Metadata]]) -> None:
             payload = [
                 {"key": key, "data": {"float32": _f32(vec)}, "metadata": meta}
                 for key, vec, meta in chunk
             ]
             self._put_batch(payload)
+
+        with ThreadPoolExecutor(max_workers=min(max_workers, len(chunks))) as executor:
+            futures = [executor.submit(_upload_chunk, chunk) for chunk in chunks]
+            for future in as_completed(futures):
+                future.result()  # Ensures any exception raised in thread is re-raised
+
         log_store_event(
             self._logger,
             "s3vectors.put_vectors",
diff --git a/tests/test_s3vectors.py b/tests/test_s3vectors.py
index e4cf0e2..3d48a7d 100644
--- a/tests/test_s3vectors.py
+++ b/tests/test_s3vectors.py
@@ -1,3 +1,4 @@
+import time
 from unittest.mock import MagicMock
 
 import pytest
@@ -164,3 +165,52 @@ def test_query_pages_invalid_page_size():
 def test_config_rejects_non_positive_top_k_page_size():
 	with pytest.raises(ValueError, match="top_k_page_size must be a positive integer"):
 		_config(top_k_page_size=0)
+
+
+
+
+
+
+
+def test_put_vectors_parallelization():
+    store, _ = _store_with_pages([])
+    
+    
+    vectors = [
+        (f"key_{i}", [0.1] * 128, {"tag": "test"})
+        for i in range(1500)
+    ]
+
+    def mock_put_batch(payload):
+        time.sleep(0.1)  
+
+    store._put_batch = MagicMock(side_effect=mock_put_batch)
+
+    t0 = time.perf_counter()
+    store.put_vectors(vectors)
+    duration = time.perf_counter() - t0
+
+    
+    assert duration < 0.5
+    assert store._put_batch.call_count == 3
+
+
+def test_put_vectors_error_propagation():
+    store, _ = _store_with_pages([])
+    
+    vectors = [
+        (f"key_{i}", [0.1] * 128, {"tag": "test"})
+        for i in range(1000)
+    ]
+
+    def mock_put_batch_with_error(payload):
+        if payload[0]["key"] == "key_0":
+            raise RuntimeError("S3 API Failure")
+
+    store._put_batch = MagicMock(side_effect=mock_put_batch_with_error)
+
+    with pytest.raises(RuntimeError, match="S3 API Failure"):
+        store.put_vectors(vectors)
+
+
+