The S&P 500 through $SPY: Dealers Are Short Gamma in $SPY. Is $835.79 the Number They Hedge Toward?

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The chart on State Street SPDR S&P 500 ETF Trust looks ordinary. The options book does not.

$SPY sits at $773.09, $8.53 below its 20-day high of $781.62 and $14.30 above its 20-day low of $758.79.

My read: binary, event-driven. This one belongs to the calendar more than the chart.

Dealers have a deadline

Against its own 60-session range, $SPY is 1.1% below the high of $781.62 (Oct 6) and 6.0% above the low of $729.10 (Jul 29).

$SPY closed higher in 5 of its last 9 sessions. Volume over the last five sessions was in line with the twenty sessions before them (1.0x). The largest one-day move in the past twenty sessions was -1.1% on Oct 16.

Dealers are short gamma on SPY: they have to buy as it rises and sell as it falls, which is what turns a move into a run.

100% of the open options are same-day expiries, the fuel that makes gamma moves violent in the final hours.

What I make of it: when the hedging runs the same direction as the price, it stops being background noise and starts being the move.

What the market looks to be pricing in

Off-exchange trading: NORMAL: $9.8M block at $773.51, under half yesterday's biggest. Biggest single off-exchange print: 12,629 shares at $773.51, about $9.8M, on a downtick (seller hit). A print that size is one order being crossed away from the public book, not a crowd of small trades. In options, dealers short gamma, call wall $780.00, put wall $620.00, gamma flip near $769.00, 100% of open options expire today, hedge pressure 4% of an average day's volume. Days to cover 2.0, 98.5M shares short, short interest +1.7% since the last report.

Squeeze risk 20 of 100; shorts pressing 62 of 100.

Earnings today (2026-10-21); the options market prices a 0.2% move. Across the broader market, the read is Neutral (bias +17).

What I make of it: the pieces mostly point the same way as the price, which is more than I can say for most setups. None of them is proof.

The bull case

• Gamma squeeze setup with a measured path to $835.79

The bear case

• Backdrop: Neutral (bias +17)
• A binary earnings event inside the window
• Strikes are often crossed without a reaction

The part nobody is talking about

What I think traders are overlooking is the volume. Price can drift to a level on almost nothing, and what it does there needs real participation. Without it, a break is easy to fade.

The price alone doesn't show it.

If I'm right, and what proves me wrong

If $SPY posts a push through $780.00 on volume and volume expands, I think $835.79 becomes the next serious test. Under $718.97, I'm wrong.

The honest objection is that open interest shows contracts, not who holds which side, so any dealer map is an inference. Strikes with heavy interest get crossed without a ripple more often than people admit.

That's the whole trade: a level to clear, a line that proves me wrong, and not much in between.

Kill switch

Any one of these and the thesis is over, no averaging down, no renaming it.

• A close through $718.97.
• Selling absorbs the buying at a key level and price loses it on volume.
• Order flow reverses: the sweeps and blocks turn to the other side.
• A scheduled event changes the picture before the trigger is reached.

What I'm watching

This one belongs to the calendar, not the chart. Whatever I think of the setup, the report gets a vote, and I'd size accordingly.

Desk record. 5 of 13 scenario targets traded before their invalidation (38%), 8 stopped out, 0 ran out of time, average outcome +9.73% per piece. Past pieces say nothing about this one.

The desk's scenario leans bullish. Bull or bear, the kill switch above is what keeps either view honest.

Sources and further reading: SEC EDGAR filings for SPY · FINRA daily short sale volume files · Nasdaq short interest: SPY · Cboe options quotes: SPY · Nasdaq earnings page: SPY · SPY quote, chart and data on StockMarketLoop.

Data as of Oct 21, 4:04 PM ET: options positioning, FINRA short volume, the off-exchange trade record, the structure map, SEC filings and the ticker's headlines. Vaughn McNair (Grandmaster-Obi) and Making Easy Money may hold or trade positions in the names discussed. This is speculation and education, not financial advice.