diff --git a/agent_os/backend/routes/runs.py b/agent_os/backend/routes/runs.py
index 8d8f9cdc..7c763c08 100644
--- a/agent_os/backend/routes/runs.py
+++ b/agent_os/backend/routes/runs.py
@@ -104,6 +104,27 @@ async def trigger_auto(
     background_tasks.add_task(_run_and_store, run_id, engine.run_auto(run_id, params or {}))
     return {"run_id": run_id, "status": "queued"}
 
+@router.delete("/portfolio-stage")
+async def reset_portfolio_stage(
+    params: Dict[str, Any],
+    user: dict = Depends(get_current_user),
+):
+    """Delete PM decision and execution result for a given date/portfolio_id.
+
+    After calling this, an auto run will re-run Phase 3 from scratch
+    (Phases 1 & 2 are skipped if their cached results still exist).
+    """
+    from tradingagents.portfolio.report_store import ReportStore
+    date = params.get("date")
+    portfolio_id = params.get("portfolio_id")
+    if not date or not portfolio_id:
+        raise HTTPException(status_code=422, detail="date and portfolio_id are required")
+    store = ReportStore()
+    deleted = store.clear_portfolio_stage(date, portfolio_id)
+    logger.info("reset_portfolio_stage date=%s portfolio=%s deleted=%s user=%s", date, portfolio_id, deleted, user["user_id"])
+    return {"deleted": deleted, "date": date, "portfolio_id": portfolio_id}
+
+
 @router.get("/")
 async def list_runs(user: dict = Depends(get_current_user)):
     # Filter by user in production
diff --git a/agent_os/frontend/src/Dashboard.tsx b/agent_os/frontend/src/Dashboard.tsx
index 0f794c26..80317f14 100644
--- a/agent_os/frontend/src/Dashboard.tsx
+++ b/agent_os/frontend/src/Dashboard.tsx
@@ -35,7 +35,7 @@ import {
   Collapse,
   useToast,
 } from '@chakra-ui/react';
-import { LayoutDashboard, Wallet, Settings, Terminal as TerminalIcon, ChevronRight, Eye, Search, BarChart3, Bot, ChevronDown, ChevronUp } from 'lucide-react';
+import { LayoutDashboard, Wallet, Settings, Terminal as TerminalIcon, ChevronRight, Eye, Search, BarChart3, Bot, ChevronDown, ChevronUp, Trash2 } from 'lucide-react';
 import { MetricHeader } from './components/MetricHeader';
 import { AgentGraph } from './components/AgentGraph';
 import { PortfolioViewer } from './components/PortfolioViewer';
@@ -371,6 +371,27 @@ export const Dashboard: React.FC = () => {
     }
   };
 
+  const resetPortfolioStage = async () => {
+    if (!params.date || !params.portfolio_id) {
+      toast({ title: 'Date and Portfolio ID are required', status: 'warning', duration: 3000, isClosable: true, position: 'top' });
+      setShowParams(true);
+      return;
+    }
+    try {
+      const res = await axios.delete(`${API_BASE}/run/portfolio-stage`, { data: { date: params.date, portfolio_id: params.portfolio_id } });
+      const deleted: string[] = res.data.deleted;
+      toast({
+        title: deleted.length ? `Cleared: ${deleted.join(', ')}` : 'Nothing to clear — no decision files found',
+        status: deleted.length ? 'success' : 'info',
+        duration: 4000,
+        isClosable: true,
+        position: 'top',
+      });
+    } catch (err) {
+      toast({ title: 'Failed to reset portfolio stage', status: 'error', duration: 3000, isClosable: true, position: 'top' });
+    }
+  };
+
   /** Open the full-screen event detail modal */
   const openModal = useCallback((evt: AgentEvent) => {
     setModalEvent(evt);
@@ -483,6 +504,19 @@ export const Dashboard: React.FC = () => {
                       );
                     })}
                     <Divider orientation="vertical" h="20px" />
+                    <Tooltip label="Clear PM decision & execution result for this date/portfolio, then re-run Auto to start Phase 3 fresh">
+                      <Button
+                        size="sm"
+                        leftIcon={<Trash2 size={14} />}
+                        colorScheme="red"
+                        variant="outline"
+                        onClick={resetPortfolioStage}
+                        isDisabled={isRunning}
+                      >
+                        Reset Decision
+                      </Button>
+                    </Tooltip>
+                    <Divider orientation="vertical" h="20px" />
                     <Tag size="sm" colorScheme={status === 'streaming' ? 'green' : status === 'completed' ? 'blue' : status === 'error' ? 'red' : 'gray'}>
                       {status.toUpperCase()}
                     </Tag>
diff --git a/tradingagents/portfolio/report_store.py b/tradingagents/portfolio/report_store.py
index e40c32d8..9ee27401 100644
--- a/tradingagents/portfolio/report_store.py
+++ b/tradingagents/portfolio/report_store.py
@@ -303,6 +303,23 @@ class ReportStore:
         path = self._portfolio_dir(date) / f"{portfolio_id}_execution_result.json"
         return self._read_json(path)
 
+    def clear_portfolio_stage(self, date: str, portfolio_id: str) -> list[str]:
+        """Delete PM decision and execution result files for a given date/portfolio.
+
+        Returns a list of deleted file names so the caller can log what was removed.
+        """
+        targets = [
+            self._portfolio_dir(date) / f"{portfolio_id}_pm_decision.json",
+            self._portfolio_dir(date) / f"{portfolio_id}_pm_decision.md",
+            self._portfolio_dir(date) / f"{portfolio_id}_execution_result.json",
+        ]
+        deleted = []
+        for path in targets:
+            if path.exists():
+                path.unlink()
+                deleted.append(path.name)
+        return deleted
+
     def list_pm_decisions(self, portfolio_id: str) -> list[Path]:
         """Return all saved PM decision JSON paths for portfolio_id, newest first.