Morning Brief — Fri Sep 18, 2026

SPY's dealer call wall sits at 760, and spot is trading at 760.53 — it is, right now, sitting on top of it. That's a different situation than being below the flip. SPY's zero-gamma flip is still down at 753.28, so dealers are net long gamma and still damping moves; the cushion (0.95%, about 1.2x today's 0.78% expected move) is real. It's just capped on the upside exactly here. A rejection at 760 doesn't flip the regime — it just caps today's range until the wall actually breaks.

QQQ is the one name on the board that's actually below its flip. Spot is 718.19 against a 724 flip (−0.81% cushion) — and the twist is that QQQ's own call wall (720) sits below that flip. So even a bounce back toward the flip has to clear 720 first, on a day with only a 0.65% expected move. QQQ's realistic ceiling before the flip is even back in play is about half a percent away.

IWM and DIA don't print a clean zero-gamma flip this morning — worth saying plainly rather than inventing a level. Both are hugging their nearest put wall instead (IWM: spot 284.58 vs. put wall 285; DIA: spot 515.83 vs. put wall 516), with no dealer-gamma pivot to lean on either way.

Flip = zero-gamma pivot · Call wall = dealer resistance above.

Verdict: STABLE. "3 of 4 majors hold positive gamma with room to the flip. QQQ sits just below its own — not enough to shift the regime, but it's the one to watch."

SPY being PAST WALL is a different animal than QQQ being BELOW FLIP. QQQ's condition means dealers are short gamma and amplify whatever move happens — that's the fragile one. SPY's condition means dealers are still long gamma (cushion +0.95%, 1.2x the expected move) but price has run all the way up into the strike where that positive gamma turns into a wall — the exact spot where hedging flows lean against further upside.

Practically: SPY chop between the wall (760) and the flip (753.28) is the higher-probability outcome while both hold. A clean break and hold above 760 opens real room, since the flip is still nearly a percent below spot. A rejection at 760 that fails to hold 753.28 is the scenario that actually matters — that's when SPY would join QQQ on the wrong side of its own flip, and the "3 of 4" in today's verdict becomes "2 of 4."

The standout: SPCX's $155 call expiring today (9/18) printed four separate times in the top ten — $390.6K, $378K, $368.9K and $365.6K, a combined ~$1.5M on one same-day strike. That's not diversified positioning, that's one side building the identical 0DTE bet, four times over.

AMD has the single largest print on the board ($1.19M in $600 calls, 10/16 out) and a second $600C sweep behind it for a combined ~$1.47M — but AMD also shows up with a $550P expiring today in the top ten. The size doesn't agree with itself: someone is paying up for upside a month out while someone else is buying a same-day downside bet on the same underlying.

• 1Watch SPY 760 first. Reject it and hold above 753.28 → the range chops between the wall and the flip, don't chase either edge. Lose 753.28 too → SPY joins QQQ below its own flip and the whole board tips toward BROKEN.
• 2QQQ has to clear 720 before 724 even matters. Treat 710 (put wall) to 720 (call wall) as the box. A break of 710 while still under the flip is the amplify-the-move scenario — negative gamma means dealers chase it, not fade it.
• 3IWM and DIA get no gamma pivot today — play their walls, not a regime call. IWM against 285/290, DIA against 516/520. There's no flip to lean on either way, so size these off structure alone.
• 4SPCX's four-times-repeated $155C is the one real same-day tell. Everything else in today's top sweeps is longer-dated positioning (10/16 and LEAPS) — informative for weeks out, not for this morning's tape.
• 5Keep size honest. Two of four majors have no clean flip and SPY is testing a wall right at the open — this is not a day to lean hard on a single directional read before the range is set.