One strike is holding 71% of SPY's gamma

Yesterday morning SPY was 772.75 with its flip at 776.54 — a gap of 3.79 points, and we said the 775 wall sat in between as a speed bump rather than a launchpad. A day later the gap is down to just over a point. Almost none of that closing came from price:

Look at the last two rows together. Net dealer gamma grew by $651M overnight, and the 775 strike alone grew by $668M. Every dollar of gamma the market added — and then some — went into one strike. That is what a 0DTE pin looks like while it is being built, not after.

Here is the chain around spot. The dashed line is zero; green is dealer long gamma (damping, pinning), red is dealer short gamma (amplifying):

Spot is 773.68. It is sitting on the last positive rung. Add the bands up and the asymmetry is stark: 773 → 780 carries +$2.41B of dealer long gamma, and 765 → 772 carries −$1.05B of dealer short gamma. There is 14.3× more gamma above spot than below it.

This is a genuinely two-sided structure and neither side is free. Holding above 773, the 775 block does the work — dealers sell strength into it, realised vol stays crushed, and the tape drifts. Losing 772, that same book stops damping and starts chasing, with nothing meaningful to lean on until 765. The market is pricing the calm version: SPY's 0DTE ATM IV is 11 and today's expected move is ±0.40%, about $3.22. That is a cheap number to be short the day before CPI.

QQQ's net GEX prints +$97M. On a headline basis that is positive gamma. It is also the smallest cushion of the four majors by an order of magnitude, and the location is worse than the total suggests.

Spot is 721.34, and the 721 strike itself is −$32M. The whole band from 715 to 722 — the ground QQQ is standing on — carries about −$348M, with 717 the deepest hole at −$94M. Everything that makes the net positive is the +$548M stacked from 723 to 730, all of it above spot. The flip is 728.93, which is 1.05% away — 1.81× a full day's expected move.

In plain terms: the Nasdaq is trading inside a short-gamma pocket while its scoreboard says long gamma. That is the same "location beats sign" lesson as last Thursday and Friday, and it is why QQQ is the index most likely to make the first real move tomorrow morning.

DIA's net gamma is +$10M — effectively zero, a coin standing on its edge. The one clean structure on the board is IWM, 2.53% above its flip with more than five days of expected move as cushion. It is also up the most today (+0.58%) and trading right at its 302 call wall, so the leadership is capped even where the structure is good.

SPY +0.08%, QQQ +0.08%. That reads like a nothing morning. Underneath it, this is a rotation, and a violent one for a session with no catalyst:

Four of the five largest index weights outside META and NVDA are red, and the index is flat because META is doing the lifting on its own. That is the classic shape of a market where the average stock is being sold and the tape doesn't show it — and it is exactly the kind of internal churn that a $1B pin at 775 will keep hiding until the pin expires.

One flow note worth flagging. META is the heaviest name on the sweep tape this morning at roughly $1.77M of premium across six prints — and all six are puts, five of them the 607.5 strike expiring tomorrow, on a stock that is up 2.5%. That can be hedging against the CPI print as easily as it can be a fade, and the tape doesn't tell you which. But when the one name holding the index up is also the one name attracting size on the other side, it's worth knowing. Elsewhere: MU puts (700, Jan-27, $318k) against MU's already-weak structure, and TSLA 335 calls expiring tomorrow ($181k) — precisely at its call wall.

We publish the levels before the open, so they can be marked. From Monday's free board:

The structural calls did their job — the two short-gamma names we said would travel (AMD, MU) both travelled, downward, and the one clean long (TSLA) walked to its wall. The three megacaps we flagged as sitting on their flips split one up, two down, which is the honest outcome for a coin-flip read: naming the line is the value, not calling the direction. NVDA is the miss to own — we wanted 225 and it went the other way instead, and it's the second day running the 225 wall has held it.

The change worth noting for today: INTC and AMD no longer have "no flip in the chain." Both rebuilt positive gamma overnight — but their flips came back at 104.14 and 512.98, which is 7.4% and 9.7% above spot. Same lesson as SPY, one more time: the sign flipped, the location didn't.

Every level below is read off this morning's option chain — net dealer gamma by strike — not off a chart. Cushion is the distance from spot to the zero-gamma flip, in percent and in multiples of that name's expected move (×EM); a cushion under 1× means the flip is inside a single normal session and can go either way today.

Seven names above their own flip, thirteen below. The board's own verdict is BROKEN — three of four majors under the line, which historically means trade with momentum rather than against it. But note where the strength is: IWM, PLTR, NVDA, META, TSLA are the ones with structure, and four of the five are already at or through their call walls. There's good structure on this board and very little room in it.

The pin has an expiry date, and it's tomorrow morning at 8:30.

Two things stack tonight. CRWV is 0.06× of its expected move from its own flip — the most perfectly balanced name on the board — going into an ±11% print. Whichever side it lands on, it lands with the gamma profile helping it get there: 80 below, 100 above, and nothing in between to slow it. SMCI has the same setup one notch further along, already above its 31 call wall with a ±11.9% print in front of it. Neither is holdable through the print on structure; both are defined-risk-only events.

Then CPI. Today's 775 gamma is 0DTE — it expires at tonight's close. Tomorrow morning the market meets the number with a rebuilt book, and the wall that is currently doing all the pinning will not be the same wall. That's the part worth planning for: the calm you're seeing today is a same-day artifact, not a forecast.

Nothing happened to price today and quite a lot happened to structure. SPY's flip fell almost two points to 774.72 — not because the market rallied, but because $668M of fresh dealer gamma piled into the 775 strike, which now holds 71% of the entire net book a point and a bit overhead. That is a pin, and it is doing what pins do: crushing realised vol, hiding a rotation where four of the biggest index weights are red and META alone is holding the tape up. The risk isn't in the pin — it's one dollar below it. Under 772 there is $1.05B of negative gamma and no meaningful support until 765, and QQQ is already standing inside its own version of that pocket. Trade the corridor while it holds — fade strength into 775, treat 772 as a trapdoor rather than a floor, and remember that today's entire cushion is 0DTE. It expires at the bell, and CPI prints twelve hours later.