Hey trader,
The hardest trades to take are the ones that argue with you.
I’ve been leaning bearish for two weeks. Friday’s open-interest map on SPY told me to buy a call spread.
I took it, closed it inside an hour, and walked away with 62%.
You’ve probably ignored setups like this before. The bias says no, the structure says yes, and the trade goes by while you’re waiting for the chart to agree with your gut.
The lesson here is not the gain. It’s the read that overrode the bias.
On monthly expiration day, with 47,000 calls stacked at the 745 strike and almost nothing on the put side, the dealer mechanic was going to pin price to the magnet.
That kind of setup pays whether you like the market or not. You just have to size the trade to the structure and exit at the wall.
A naked call would have bled premium on the same move. The spread cost 15 cents more than the at-the-money alternative for a specific reason I want to walk through.
The Map Before The Open
Friday was monthly expiration. The gamma on SPY was compressed into a single trading day.
I opened the chain and looked at open interest. Three numbers mattered.
The 745 strike held 47,000 calls. The next significant node was 748, building into 750.
The put side below was nearly empty. The deep out-of-the-money puts at 740 carried almost no delta into expiration.
Dealers had nothing to unwind on that side. There was no upside lift coming from put hedges, which made it a pure call-side story.
Why 745 Acts As A Magnet
A high-positive-gamma strike behaves as a magnet for price. The mechanic is mechanical once you see it.
When SPY trades above 745 with that much call open interest at the strike, dealers are short gamma. They sell into strength to stay neutral, and that selling pulls price back down toward 745.
When SPY trades below 745, the same position requires them to buy. They buy weakness to stay neutral, and that buying pushes price back up toward 745.
The result is a pin.
Price gets glued to the strike as long as both sides of the dealer mechanic are firing. SPY opened Friday up 0.66%, sitting just above 745.
The magnet was active from the bell.
The Trigger I Waited For
I never enter on the open. The first 15 minutes are noise.
SPY popped, faded back, and dropped below the opening range. Then it came down and tested 745 directly.
The bounce off that level was the first signal. A first touch is not enough on its own.
I needed a higher low to confirm the magnet was holding against any selling pressure.
The price drifted back down, made a higher low above the prior test, and started lifting again. That second touch was my entry.
The structure of the move matched what the gamma map predicted. Above 745, with positive gamma compressing the downside, the bullish path was protected until the next OI wall.
The Skew Tax And The Spread Choice
This is the part most traders miss. Bullish positioning on SPY carries a skew cost.
The market prices puts richer than calls on indices because institutions are constantly buying downside protection.
That asymmetry means a 50-cent out-of-the-money call costs slightly more than a 50-cent out-of-the-money put on a symmetrical basis. When you go bullish on SPY, you pay that skew tax on entry.
There is no avoiding it.
The 747 strike was 50 cents out of the money when I entered. A naked 746 call would have run about $1.50 with full at-the-money exposure and the full implied volatility load priced in.
The 747/749 vertical cost 65 cents.
That’s the at-the-money price minus the value sold at the upside leg, plus the skew drag.
Buying the naked call gives unlimited upside but exposes you to two risks the spread caps. The first is implied volatility crush.
The second is intraday skew movement, which on expiration day can flip in minutes as the close approaches.
The spread defines both costs upfront. Max loss is 65 cents, and max gain is $1.35 at the 749 strike or above.
No surprises from vol or skew movement after entry.
The Exit At The Next Wall
I closed at $1.05 for two reasons.
The first was the second OI wall at 748. As price approached that level, the dealer mechanic flipped.
Above 745 the dealers had been buyers of weakness. Approaching 748, they became sellers of strength because the next concentration of gamma sat at 750.
The grind into 748 was always going to get labored. The candles confirmed that, and the OI map predicted it before the candles printed.
The second reason was the holiday weekend. Friday afternoon trade on a long weekend setup compresses volume.
Holding a spread through that compression gives no upside and exposes you to overnight gap risk on the next session. I took the 62% and walked.
The Trade Recap
- Setup: SPY OPEX with 47,000 calls at 745, building into 748-750, empty put side
- Trigger: Higher low above 745 after the second test held
- Trade: Buy 747 call, sell 749 call, same-day expiration
- Cost: 65 cents per spread
- Exit: $1.05 as price approached the 748 wall
- Result: 62% gain in approximately one hour
- Max risk: 65 cents per contract
- Max gain: $1.35 per contract at 749 or above
What To Carry Forward
The bias was wrong for the day. The structure was right.
When monthly expiration concentrates gamma at a single strike, the path of least resistance is the magnet. The trigger is a higher low after the first test holds, and the exit is the next OI wall.
That sequence pays whether you like the market that week or not.
Brandon Chapman, CMT
Creator of Ghost Prints
