diff --git a/backend/app/services/collectors/etf_collector.py b/backend/app/services/collectors/etf_collector.py
index 0ed2b1f..b281c1b 100644
--- a/backend/app/services/collectors/etf_collector.py
+++ b/backend/app/services/collectors/etf_collector.py
@@ -48,6 +48,16 @@ class ETFCollector(BaseCollector):
         else:
             return AssetClass.MIXED.value
 
+    def _get_openapi_ticker(self, row) -> str:
+        """Extract 6-digit ticker from KRX Open API rows."""
+        ticker = row.get("ISU_SRT_CD", row.get("ISU_CD", ""))
+        if pd.isna(ticker):
+            return ""
+        if isinstance(ticker, float):
+            return str(int(ticker)).zfill(6)
+        ticker = str(ticker).strip()
+        return ticker.zfill(6) if ticker.isdigit() else ticker
+
     def _fetch_etf_data_openapi(self) -> pd.DataFrame:
         """Fetch ETF data via KRX Open API."""
         client = get_krx_client()
@@ -96,8 +106,8 @@ class ETFCollector(BaseCollector):
         """Parse Open API response DataFrame into ETF records."""
         records = []
         for _, row in df.iterrows():
-            ticker = row.get("ISU_SRT_CD")
-            name = row.get("ISU_ABBRV")
+            ticker = self._get_openapi_ticker(row)
+            name = row.get("ISU_ABBRV", row.get("ISU_NM"))
             if not ticker or pd.isna(ticker) or not name or pd.isna(name):
                 continue
 
@@ -114,8 +124,8 @@ class ETFCollector(BaseCollector):
         """Parse pykrx response DataFrame into ETF records."""
         records = []
         for _, row in df.iterrows():
-            ticker = row.get("ISU_SRT_CD")
-            name = row.get("ISU_ABBRV")
+            ticker = self._get_openapi_ticker(row)
+            name = row.get("ISU_ABBRV", row.get("ISU_NM"))
             if not ticker or pd.isna(ticker) or not name or pd.isna(name):
                 continue
 
diff --git a/backend/app/services/collectors/etf_price_collector.py b/backend/app/services/collectors/etf_price_collector.py
index 73c1b99..8fdaa7b 100644
--- a/backend/app/services/collectors/etf_price_collector.py
+++ b/backend/app/services/collectors/etf_price_collector.py
@@ -55,6 +55,16 @@ class ETFPriceCollector(BaseCollector):
         except (ValueError, TypeError):
             return None
 
+    def _get_openapi_ticker(self, row) -> str:
+        """Extract 6-digit ticker from KRX Open API rows."""
+        ticker = row.get("ISU_SRT_CD", row.get("ISU_CD", ""))
+        if pd.isna(ticker):
+            return ""
+        if isinstance(ticker, float):
+            return str(int(ticker)).zfill(6)
+        ticker = str(ticker).strip()
+        return ticker.zfill(6) if ticker.isdigit() else ticker
+
     def _collect_openapi(self) -> int:
         """Collect ETF prices via KRX Open API (date-based bulk fetch)."""
         client = get_krx_client()
@@ -79,7 +89,7 @@ class ETFPriceCollector(BaseCollector):
 
                 records = []
                 for _, row in df.iterrows():
-                    ticker = str(row.get("ISU_SRT_CD", ""))
+                    ticker = self._get_openapi_ticker(row)
                     if not ticker or ticker not in ticker_set:
                         continue
 
diff --git a/backend/app/services/collectors/price_collector.py b/backend/app/services/collectors/price_collector.py
index 6ea3a7b..1eaa4fe 100644
--- a/backend/app/services/collectors/price_collector.py
+++ b/backend/app/services/collectors/price_collector.py
@@ -55,6 +55,16 @@ class PriceCollector(BaseCollector):
         except (ValueError, TypeError):
             return None
 
+    def _get_openapi_ticker(self, row) -> str:
+        """Extract 6-digit ticker from KRX Open API rows."""
+        ticker = row.get("ISU_SRT_CD", row.get("ISU_CD", ""))
+        if pd.isna(ticker):
+            return ""
+        if isinstance(ticker, float):
+            return str(int(ticker)).zfill(6)
+        ticker = str(ticker).strip()
+        return ticker.zfill(6) if ticker.isdigit() else ticker
+
     def _collect_openapi(self) -> int:
         """Collect stock prices via KRX Open API (date-based bulk fetch)."""
         client = get_krx_client()
@@ -79,7 +89,7 @@ class PriceCollector(BaseCollector):
 
                     records = []
                     for _, row in df.iterrows():
-                        ticker = str(row.get("ISU_SRT_CD", ""))
+                        ticker = self._get_openapi_ticker(row)
                         if not ticker or ticker not in ticker_market:
                             continue
 
diff --git a/backend/app/services/collectors/stock_collector.py b/backend/app/services/collectors/stock_collector.py
index 0bc56fa..72dde9a 100644
--- a/backend/app/services/collectors/stock_collector.py
+++ b/backend/app/services/collectors/stock_collector.py
@@ -53,6 +53,16 @@ class StockCollector(BaseCollector):
         except (ValueError, TypeError):
             return None
 
+    def _get_openapi_ticker(self, row) -> str:
+        """Extract 6-digit ticker from KRX Open API rows."""
+        ticker = row.get("ISU_SRT_CD", row.get("ISU_CD", ""))
+        if pd.isna(ticker):
+            return ""
+        if isinstance(ticker, float):
+            return str(int(ticker)).zfill(6)
+        ticker = str(ticker).strip()
+        return ticker.zfill(6) if ticker.isdigit() else ticker
+
     def _collect_openapi(self) -> int:
         """Collect stock data via KRX Open API."""
         client = get_krx_client()
@@ -73,12 +83,12 @@ class StockCollector(BaseCollector):
             trade_map = {}
             if trade_df is not None and not trade_df.empty:
                 for _, row in trade_df.iterrows():
-                    ticker = str(row.get("ISU_SRT_CD", ""))
+                    ticker = self._get_openapi_ticker(row)
                     if ticker:
                         trade_map[ticker] = row
 
             for _, row in base_df.iterrows():
-                ticker = str(row.get("ISU_SRT_CD", ""))
+                ticker = self._get_openapi_ticker(row)
                 name = str(row.get("ISU_ABBRV", ""))
                 if not ticker or not name:
                     continue