The cushion just collapsed

The useful way to measure a gamma regime isn't "positive or negative" — that's a coin flip described after the fact. It's how far price sits from the zero-gamma flip, expressed in units of how far the market expects it to move today. Call it the cushion. Above ~2× and the regime is stable. Under 1× and it's inside a single normal session.

Here's the cushion for all four majors, yesterday morning versus this morning:

Drawn out, with the mark showing 1× expected move — anything left of it means the flip is inside a single normal session:

Three of four majors now have their flip inside one day's range. That's the entire story of this session. Note what did not happen: nothing sold off. SPY is +0.61%, QQQ +0.43%, IWM +0.29%. Price went up and the cushion still collapsed — because the flip rose faster than spot did, and net dealer gamma drained underneath it (SPY +$3.69B → +$3.01B, QQQ +$1.18B → +$0.84B). New to this? Start with what gamma exposure actually is →

The second half of the story, and the part that almost nobody looks at on a green day. At-the-money implied volatility on the index ETFs, yesterday morning versus now:

Yesterday we described index vol as crushed and the pin as priced in. That is no longer true. Implied volatility rising while the market goes up is one of the more reliable tells there is — it means someone is paying for protection into strength rather than selling it. Combine that with a collapsing gamma cushion and you have the classic setup where a market looks calmest right before it stops being calm.

AMD reported last night and is −5.11% at 492.68, down from 527.77 into the print. The number that matters isn't the drop — it's where the drop put it. AMD's zero-gamma flip is 508.11, and spot is now well below it. AMD is the one major name on the board in genuine negative gamma, where dealers amplify moves instead of damping them.

The contrast inside the same complex is the interesting part. NVDA is +4.56% at 221.87 with $823M of net dealer gamma — the most heavily pinned name in tech, and now above its 220 call wall. ANET, which also reported last night, is +2.42%. So the market didn't sell AI — it rotated inside it, out of AMD and into NVDA. Worth noting the biggest single sweep on the tape this morning is $613k of AMD 507.50 calls expiring 8/21 — somebody is paying real money for AMD to reclaim that flip.

Check any of these live on the free gamma exposure map — it's the same data this read is built from.

SPY's intraday net options premium — call premium bought minus put premium — is running −$5.3M this morning. Yesterday at the same hour it was +$11.2M.

So the tape is green and the flow is red. That divergence doesn't predict a top, and anyone telling you it does is guessing. What it does tell you is that this rally is not being bought with index calls — it's drifting up on the mechanical positive-gamma grind we've described all week, while actual positioning leans the other way. A tape that rises on thinning gamma and negative premium flow is a tape with nothing underneath it if the bid stops. That's the honest read, and it's very different from "the market is about to crash."

Naming a regime is only worth doing if it changes something. Here's what a perched regime changes versus the pinned one we had yesterday:

The single most useful habit in a regime like this: before you take any long, look up whether the name is above or below its own zero-gamma flip. Above it, a dip is a dip — dealers buy weakness for you. Below it, dealers sell weakness with you, and the same chart pattern behaves completely differently. AMD is this morning's live example of exactly that.

A cushion this thin means the next scheduled catalyst carries more weight than it normally would — there's no structural buffer to absorb a surprise.

Already out this morning: LLY (±6.4%), SHOP (±11.2%), DIS (±5.1%), UBER (±6.2%). Run any of them through the free earnings analyzer to see whether that implied move is cheap or rich against how the stock has actually reacted historically.

Nothing has broken. Every index is still in positive gamma, still grinding higher, and the base case is still that it keeps grinding. But the margin for error went from comfortable to nearly zero in a single session — three of four majors now sit inside one day's expected move of the level where dealers stop cushioning and start chasing, implied vol is up by half, the flow tide has turned negative, and the week's marquee chip name has already fallen through its own floor. This is not a call to get short. It's a call to stop sizing like the pin is guaranteed, because as of this morning it isn't.