diff --git a/ft-app/app/collector.py b/ft-app/app/collector.py
index 85d285e..faf7d4e 100644
--- a/ft-app/app/collector.py
+++ b/ft-app/app/collector.py
@@ -293,10 +293,14 @@ def fetch_position_rankings(contract_code: str, trade_date: str) -> list[dict]:
 
         for _, row in df.iterrows():
             try:
+                inst = str(row["会员简称"]).strip()
+                rank = int(row["名次"])
+                if inst in ("-", ""):
+                    inst = f"-{rank}"
                 results.append({
                     "data_type": dtype,
-                    "rank": int(row["名次"]),
-                    "institution": str(row["会员简称"]),
+                    "rank": rank,
+                    "institution": inst,
                     "value": int(row.iloc[2]),
                     "change": int(row["比上交易增减"]),
                 })
diff --git a/ft-app/data/ft.db b/ft-app/data/ft.db
index 8a8b146..2cbfe49 100644
Binary files a/ft-app/data/ft.db and b/ft-app/data/ft.db differ