diff --git a/backend/app/api/endpoints/portfolio.py b/backend/app/api/endpoints/portfolio.py
index b6f7078..821684e 100644
--- a/backend/app/api/endpoints/portfolio.py
+++ b/backend/app/api/endpoints/portfolio.py
@@ -1457,6 +1457,25 @@ async def sell_stock(
 
         await db.commit()
 
+        # ActiveTrade 정리 — 누락 시 유령 active 행이 남아, 같은 종목을 다시 매수했을 때
+        # 옛 remaining_pct(예: 0.50)가 살아나 1차 익절이 건너뛰어진다.
+        # (2026-09-23 확인: 삼아알미늄·LG 등 수동 청산 종목이 active 상태로 잔존)
+        from app.services.db_worker import (
+            enqueue_close_active_trade as _enq_close_at,
+            enqueue_active_trade_upsert as _enq_at_upsert,
+        )
+        try:
+            if quantity >= original_holding_qty:
+                await _enq_close_at(stock_code, strategy_name=None)
+            else:
+                await _enq_at_upsert({
+                    "stock_code": stock_code,
+                    "quantity": original_holding_qty - quantity,
+                    "current_price": float(executed_price),
+                })
+        except Exception as _at_err:
+            logger.warning(f"[SELL] ActiveTrade 정리 실패 {stock_code}: {_at_err}")
+
         # ✅ 인메모리 캐시 즉시 반영 (KIS 재동기화 전에도 화면에서 즉시 제거)
         if quantity >= original_holding_qty:
             portfolio_cache.holdings = [
diff --git a/backend/app/services/swing/exit_service.py b/backend/app/services/swing/exit_service.py
index 3a69a4f..3b0e2f8 100644
--- a/backend/app/services/swing/exit_service.py
+++ b/backend/app/services/swing/exit_service.py
@@ -349,6 +349,9 @@ async def check_and_execute_exit_v2(db: AsyncSession) -> list[dict]:
                     _at_data = {
                         "stock_code": stock_code,
                         "remaining_pct": new_remaining,
+                        # 잔량도 함께 갱신 — 누락 시 재기동 복원이 원래 수량으로 되살아나
+                        # 보유량보다 많이 매도한다(2026-09-23 DT LG씨엔에스 사례와 동일 패턴)
+                        "quantity": quantity - sell_qty,
                         "highest_since_entry": latest_price if latest_price > (trailing_high or 0) else trailing_high,
                     }
                     if active_trade is None:
diff --git a/backend/app/services/trade_executor.py b/backend/app/services/trade_executor.py
index e3dd2f6..6aa9bdb 100644
--- a/backend/app/services/trade_executor.py
+++ b/backend/app/services/trade_executor.py
@@ -1256,6 +1256,7 @@ async def _execute_sell(
                     await enqueue_active_trade_upsert({
                         "stock_code": stock_code,
                         "remaining_pct": new_remaining,
+                        "quantity": max(0, total_qty - quantity),  # 잔량 갱신(과다매도 방지)
                         "highest_since_entry": current_price,
                     })
             except Exception as _at_err:
diff --git a/backend/app/services/us_market_scheduler.py b/backend/app/services/us_market_scheduler.py
index 3ea33b2..740bd6e 100644
--- a/backend/app/services/us_market_scheduler.py
+++ b/backend/app/services/us_market_scheduler.py
@@ -399,6 +399,9 @@ async def _monitor_us_exits(exchange_rate: float = _DEFAULT_FX_RATE) -> List[Dic
                             "stock_code": ticker,
                             "strategy_name": "us_mean_reversion",
                             "remaining_pct": round(new_remaining, 2),
+                            # 잔량 갱신 — 누락 시 다음 사이클이 원래 수량 기준으로 매도량을
+                            # 계산해 보유량보다 많이 판다(total_qty = trade.quantity)
+                            "quantity": max(0, total_qty - sell_qty),
                             "current_price": current_price,
                         })
 
diff --git a/backend/tests/test_bugfixes_20260923.py b/backend/tests/test_bugfixes_20260923.py
index 8f67504..4a45789 100644
--- a/backend/tests/test_bugfixes_20260923.py
+++ b/backend/tests/test_bugfixes_20260923.py
@@ -98,3 +98,41 @@ async def test_dt_partial_exit_updates_active_trade_quantity():
     at = [u for u in upserts if u.get("stock_code") == "064400"]
     assert at and at[-1]["quantity"] == 4, f"ActiveTrade 잔량 갱신 누락: {upserts}"
     day_trading_state.positions.clear()
+
+
+@pytest.mark.asyncio
+async def test_swing_partial_exit_persists_remaining_quantity():
+    """스윙 분할매도도 ActiveTrade.quantity를 갱신해야 한다(DT와 동일 패턴)."""
+    import inspect
+    from app.services.swing import exit_service as ses
+    src = inspect.getsource(ses)
+    block = src[src.index("분할 매도 후 remaining_pct 갱신"):]
+    block = block[:block.index("await enqueue_active_trade_upsert(_at_data)")]
+    assert '"quantity": quantity - sell_qty' in block, "스윙 분할매도에 잔량 갱신 누락"
+
+
+def test_us_partial_exit_persists_remaining_quantity():
+    """미국 스윙도 동일 — total_qty = trade.quantity 를 읽으므로 갱신이 없으면 과다매도."""
+    import inspect
+    from app.services import us_market_scheduler as us
+    src = inspect.getsource(us)
+    i = src.index('"strategy_name": "us_mean_reversion",\n                            "remaining_pct"')
+    block = src[i:i + 500]
+    assert '"quantity": max(0, total_qty - sell_qty)' in block, "미국 분할매도에 잔량 갱신 누락"
+
+
+def test_domestic_executor_partial_exit_persists_quantity():
+    import inspect
+    from app.services import trade_executor as te
+    src = inspect.getsource(te)
+    i = src.index('"remaining_pct": new_remaining,\n                        "quantity"')
+    assert 'max(0, total_qty - quantity)' in src[i:i + 200]
+
+
+def test_manual_sell_closes_active_trade():
+    """수동 전량 매도는 ActiveTrade를 closed 로 만들어야 유령 행이 남지 않는다."""
+    import inspect
+    from app.api.endpoints import portfolio as pf
+    src = inspect.getsource(pf.sell_stock)
+    assert "_enq_close_at(stock_code" in src
+    assert '"quantity": original_holding_qty - quantity' in src