diff --git a/backend/app/api/endpoints/portfolio.py b/backend/app/api/endpoints/portfolio.py
index 7990e84..c462c47 100644
--- a/backend/app/api/endpoints/portfolio.py
+++ b/backend/app/api/endpoints/portfolio.py
@@ -19,6 +19,7 @@ from app.models.models import Portfolio, TradeHistory, ActiveTrade, StockAnalysi
 from app.services.korea_investment_api import korea_investment_api
 from app.services.mean_reversion_strategy import (
     calculate_atr, calculate_rsi, calculate_bollinger, check_exit_signal,
+    MarketRegime,  # ① regime 파라미터 전달용 추가
 )
 from app.services.mdd_manager import mdd_manager
 from app.services.loss_tracker import loss_tracker
@@ -481,9 +482,10 @@ async def check_and_execute_exit_trades(db: AsyncSession):
     """
     보유 종목의 손절/익절 조건을 체크하고 자동 매도 실행
     CLAUDE.md 섹션 6.2 + 7.3 + 7.4 기반:
-    - ATR 기반 손절: min(최저가 - 2.5×ATR, 진입가 -8%)
-    - 1차 익절(50%): RSI ≥ 50 + BB 중앙선 상회
-    - 2차 익절(전량): RSI 60~70 + BB 상단선
+    - ATR 기반 손절: min(최저가 - 2.5×ATR, 진입가 -6%)  ← -8% → -6%
+    - 1차 익절(30%/50%): RSI 55~65 + BB 중앙선 상회
+    - 2차 익절(50%): RSI ≥ 65 + BB 상단선 도달
+    - 트레일링 스탑: 최고가 대비 -3% 하락 시 잔여 전량 청산
     - 폴백: 고정 비율 손절 (STOP_LOSS_PERCENT)
     """
     from app.core.config import settings
@@ -545,17 +547,27 @@ async def check_and_execute_exit_trades(db: AsyncSession):
                     chart_data = chart_resp.get("output2", [])
                     if len(chart_data) >= 20:
                         closes = [float(d.get("stck_clpr", 0)) for d in reversed(chart_data)]
-                        highs = [float(d.get("stck_hgpr", 0)) for d in reversed(chart_data)]
-                        lows = [float(d.get("stck_lwpr", 0)) for d in reversed(chart_data)]
+                        highs  = [float(d.get("stck_hgpr", 0)) for d in reversed(chart_data)]
+                        lows   = [float(d.get("stck_lwpr", 0)) for d in reversed(chart_data)]
 
                         atr = calculate_atr(highs, lows, closes)
                         rsi = calculate_rsi(closes)
-                        bb = calculate_bollinger(closes)
+                        bb  = calculate_bollinger(closes)
 
                         if atr and rsi is not None and bb:
                             bb_upper, bb_middle, bb_lower = bb
                             lowest_since = min(lows[-5:]) if lows else avg_price
+
+                            # ② 진입 후 최고가 (트레일링 스탑용) — 최근 10봉 최고값으로 근사
+                            trailing_high = max(highs[-10:]) if highs else None
+
+                            # ① 시장 레짐 결정
+                            # TODO: KOSPI 지수 일봉 기반 detect_market_regime() 으로 대체 예정
+                            #   현재는 BULL 기본값 사용 (보수적 선택 — 1차 30% 익절)
+                            regime = MarketRegime.BULL
+
                             exit_signal = check_exit_signal(
+                                regime=regime,
                                 rsi=rsi,
                                 close=latest_price,
                                 bb_upper=bb_upper,
@@ -565,6 +577,7 @@ async def check_and_execute_exit_trades(db: AsyncSession):
                                 atr=atr,
                                 lowest_since_entry=lowest_since,
                                 remaining_pct=remaining_pct,
+                                trailing_high=trailing_high,  # ② 트레일링 스탑 활성화
                             )
                 except Exception as chart_err:
                     logger.debug(f"ATR 청산 계산 실패 ({stock_code}): {chart_err}")
@@ -637,7 +650,12 @@ async def check_and_execute_exit_trades(db: AsyncSession):
 
                         # 분할 청산 시 ActiveTrade 잔여 비율 업데이트
                         if exit_signal and exit_signal.action == "SELL_PARTIAL" and active_trade:
-                            active_trade.remaining_pct = Decimal(str(remaining_pct - exit_signal.sell_pct))
+                            # ③ 정확한 잔여 비율 계산:
+                            #   sell_pct = 현재 보유량 대비 비율이므로
+                            #   new_remaining = remaining_pct × (1 - sell_pct)
+                            #   예) remaining=0.70, sell_pct=0.50 → 0.70×0.50=0.35 (기존: 0.70-0.50=0.20 오류)
+                            new_remaining = remaining_pct * (1.0 - exit_signal.sell_pct)
+                            active_trade.remaining_pct = Decimal(str(round(new_remaining, 4)))
                             await db.commit()
                         else:
                             # 전량 매도