diff --git a/app/services/insider_transaction_service.py b/app/services/insider_transaction_service.py
index 812d0c5..6084ecb 100644
--- a/app/services/insider_transaction_service.py
+++ b/app/services/insider_transaction_service.py
@@ -22,7 +22,7 @@ from app.services.sec_full_index_service import IndexEntry
 logger = logging.getLogger(__name__)
 
 # Chunk size for batch insert (asyncpg 32767-param limit)
-_CHUNK = 1500  # ~22 cols × 1500 = 33000 → stay under 32767 with ~20 populated
+_CHUNK = 1200  # 26 cols × 1200 = 31200 → safely under asyncpg 32767-param limit
 
 # C-suite title regex patterns (case-insensitive)
 _RE_CEO = re.compile(r"\b(CEO|Chief\s+Executive\s+Officer)\b", re.IGNORECASE)