diff --git a/app/services/ticker_service.py b/app/services/ticker_service.py
index 6cf58d3..9c58c15 100644
--- a/app/services/ticker_service.py
+++ b/app/services/ticker_service.py
@@ -106,9 +106,11 @@ async def mark_delisted(
 ) -> bool:
     """Record that a symbol stopped trading. True if this changed anything.
 
-    Idempotent: re-marking an already-delisted symbol is a no-op, so the
-    staleness path can call it on every run without churning the row or
-    re-emitting events.
+    Idempotent, so the staleness path can call it every run without churning the
+    row: re-marking is a no-op. The one exception is an SEC confirmation landing
+    on a row an operator marked by hand — Form 25 carries the real effective
+    date, so it replaces the operator's estimate. Nothing downgrades a confirmed
+    row back to a manual one.
     """
     normalised = symbol.strip().upper()
     result = await db.execute(select(Ticker).where(Ticker.symbol == normalised))
@@ -116,7 +118,11 @@ async def mark_delisted(
     if ticker is None:
         raise NotFoundError(f"Ticker not found: {normalised}")
     if ticker.delisted_on is not None:
-        return False
+        upgrading = (
+            reason == REASON_FORM_25 and ticker.delisted_reason != REASON_FORM_25
+        )
+        if not upgrading:
+            return False
 
     await db.execute(
         update(Ticker)
@@ -158,7 +164,11 @@ async def confirm_delisting(
     normalised = symbol.strip().upper()
     result = await db.execute(select(Ticker).where(Ticker.symbol == normalised))
     ticker = result.scalar_one_or_none()
-    if ticker is None or ticker.delisted_on is not None or not ticker.cik:
+    if ticker is None or not ticker.cik:
+        return None
+    # Already confirmed by SEC — nothing left to learn. A row an operator marked
+    # by hand is still worth probing: Form 25 upgrades the estimated date.
+    if ticker.delisted_reason == REASON_FORM_25:
         return None
     # No bars at all is an ingestion problem, not evidence of a delisting.
     if last_bar is None:
diff --git a/tests/unit/test_ticker_delisting.py b/tests/unit/test_ticker_delisting.py
index 957c088..08ce190 100644
--- a/tests/unit/test_ticker_delisting.py
+++ b/tests/unit/test_ticker_delisting.py
@@ -181,3 +181,54 @@ async def test_confirm_delisting_waits_before_spending_a_request(session: AsyncS
     assert await ticker_service.confirm_delisting(
         session, "EA", last_bar=None, today=date(2026, 8, 11)
     ) is None
+
+
+async def test_sec_confirmation_upgrades_a_manual_mark(session: AsyncSession, monkeypatch):
+    """An operator's estimated date is a guess; Form 25 carries the real one."""
+    session.add(Ticker(symbol="EA", cik="0000712515"))
+    await session.commit()
+    await ticker_service.mark_delisted(session, "EA", delisted_on=date(2026, 8, 11))
+
+    monkeypatch.setattr(
+        ticker_service,
+        "_sec_client_factory",
+        lambda: _sec_client(_submissions(["25-NSE"], ["2026-08-04"])),
+        raising=False,
+    )
+    assert await ticker_service.confirm_delisting(
+        session, "EA", last_bar=date(2026, 8, 4), today=date(2026, 8, 11)
+    ) == date(2026, 8, 4)
+
+    row = (await session.execute(select(Ticker).where(Ticker.symbol == "EA"))).scalar_one()
+    assert row.delisted_on == date(2026, 8, 4)
+    assert row.delisted_reason == ticker_service.REASON_FORM_25
+
+
+async def test_a_confirmed_row_is_never_reprobed(session: AsyncSession, monkeypatch):
+    session.add(Ticker(symbol="EA", cik="0000712515"))
+    await session.commit()
+    await ticker_service.mark_delisted(
+        session, "EA", delisted_on=date(2026, 8, 4),
+        reason=ticker_service.REASON_FORM_25,
+    )
+
+    def _explode():
+        raise AssertionError("a SEC-confirmed row must not cost another request")
+
+    monkeypatch.setattr(ticker_service, "_sec_client_factory", _explode, raising=False)
+    assert await ticker_service.confirm_delisting(
+        session, "EA", last_bar=date(2026, 8, 4), today=date(2026, 9, 1)
+    ) is None
+
+
+async def test_ohlcv_priority_ordering_skips_delisted(session: AsyncSession):
+    """Covers the one statement where active_only wraps a compound select."""
+    from app.scheduler import _get_ohlcv_priority_tickers
+
+    session.add_all([Ticker(symbol="AAPL"), Ticker(symbol="EA"), Ticker(symbol="MSFT")])
+    await session.commit()
+    await ticker_service.mark_delisted(session, "EA", delisted_on=date(2026, 8, 4))
+
+    symbols = await _get_ohlcv_priority_tickers(session)
+    assert "EA" not in symbols
+    assert sorted(symbols) == ["AAPL", "MSFT"]