diff --git a/app/api/v1_portfolios.py b/app/api/v1_portfolios.py
index 0262dc2..7c1fcb3 100644
--- a/app/api/v1_portfolios.py
+++ b/app/api/v1_portfolios.py
@@ -18,12 +18,12 @@ import uuid
 from datetime import date, datetime, timedelta, timezone
 from decimal import Decimal
 
-from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
+from fastapi import APIRouter, Depends, Header, HTTPException, Query, Response, status
 
 from app.core.auth import AuthContext, Permission, require_read, require_trade_write
 from app.core.config import get_settings
 from app.domain.errors import DaemonInactiveError, DaemonNotFoundError
-from app.domain.models import Portfolio, PortfolioComment
+from app.domain.models import CorporateAction, Portfolio, PortfolioComment
 from app.domain.pnl import calculate_current_wac, calculate_realized_pnl
 from app.repositories.factory import get_portfolio_repository_from_settings
 from app.schemas.v1 import (
@@ -55,6 +55,7 @@ from app.schemas.v1 import (
     TradeHistoryItem,
     TradeHistoryResponse,
 )
+from app.schemas.corporate_actions import CorporateActionRequest, CorporateActionResponse
 from app.services.strategy_set_service import (
     StrategyInactiveError,
     StrategyNotFoundError,
@@ -1295,3 +1296,27 @@ def get_holdings_cost_basis(
         cost_basis_from=wac_result.cost_basis_from,
         data_completeness_warning=wac_result.data_completeness_warning,
     )
+
+
+@router.post("/{portfolio_id}/corporate-actions", response_model=CorporateActionResponse, status_code=status.HTTP_201_CREATED)
+def create_corporate_action(portfolio_id: str, payload: CorporateActionRequest, response: Response, auth: AuthContext = Depends(require_trade_write), idempotency_key: str = Header(..., alias="Idempotency-Key")):
+    repo = _get_repo()
+    try:
+        portfolio = repo.get(portfolio_id)
+        if portfolio is None:
+            raise HTTPException(status_code=404, detail="Portfolio not found")
+        if portfolio.owner_user_id != auth.user_id and auth.permission != Permission.ADMIN:
+            raise HTTPException(status_code=403, detail="Portfolio ownership mismatch")
+        if portfolio.managed_by_daemon_id and not payload.confirm_daemon_managed:
+            raise HTTPException(status_code=409, detail="DAEMON_MANAGED_CONFIRMATION_REQUIRED")
+        from app.domain.corporate_actions import calculate_stock_consolidation
+        calc = calculate_stock_consolidation(payload.quantity_before, payload.quantity_after, Decimal(str(getattr(portfolio, "price", 0))))
+        digest = hashlib.sha256(payload.model_dump_json().encode()).hexdigest()
+        action = CorporateAction(str(uuid.uuid4()), portfolio_id, portfolio.asset_id, payload.action_type, payload.effective_date, calc.quantity_before, calc.quantity_after, calc.average_price_before, calc.average_price_after, calc.total_cost_basis, Decimal(str(portfolio.cash_balance)), Decimal(str(portfolio.profit_buffer)), payload.evidence_ref, idempotency_key, digest, 0, auth.user_id)
+        saved = repo.record_corporate_action(portfolio_id, action=action, idempotency_key=idempotency_key, payload_hash=digest)
+        return CorporateActionResponse(**saved.__dict__)
+    except ValueError as exc:
+        code = str(exc)
+        raise HTTPException(status_code=409 if code.startswith(("IDEMPOTENCY", "CORPORATE_ACTION_")) else 400, detail=code) from exc
+    finally:
+        _close_repo(repo)
diff --git a/app/domain/pnl.py b/app/domain/pnl.py
index 2a0663b..85d65a4 100644
--- a/app/domain/pnl.py
+++ b/app/domain/pnl.py
@@ -170,6 +170,17 @@ def calculate_realized_pnl(
             if running_qty < 0:
                 running_qty = 0.0
 
+        elif side == "stock_consolidation":
+            before = float(row.get("quantity_before", running_qty))
+            after = float(row.get("quantity_after", row.get("asset_quantity_after", 0.0)))
+            if before <= 0 or after <= 0 or running_qty <= 0:
+                warning_triggered = True
+                continue
+            if abs(running_qty - before) > 1e-9:
+                warning_triggered = True
+            running_qty = after
+            running_wac = float(row.get("average_price_after", running_wac * before / after))
+
     warning: str | None = None
     if warning_triggered:
         warning = (
@@ -252,6 +263,17 @@ def calculate_current_wac(rows: list[dict[str, Any]]) -> CurrentWacResult:
             if running_qty < 0:
                 running_qty = 0.0
 
+        elif side == "stock_consolidation":
+            before = float(row.get("quantity_before", running_qty))
+            after = float(row.get("quantity_after", row.get("asset_quantity_after", 0.0)))
+            if before <= 0 or after <= 0 or running_qty <= 0:
+                warning_triggered = True
+                continue
+            if abs(running_qty - before) > 1e-9:
+                warning_triggered = True
+            running_qty = after
+            running_wac = float(row.get("average_price_after", running_wac * before / after))
+
     warning: str | None = None
     if warning_triggered:
         warning = (