PLTR calendar call spread: selling time twice

Same strike, two expiries. The short Oct 30 call decays on a steep curve; the long Nov 20 call decays on a shallow one. The difference between those two decay rates is the entire profit engine — which is why the position wants the stock to sit still.

Max profit occurs with PLTR pinned at $190 on October 30, 2026: the short call expires worthless and you still own a 21-days-longer call. The engine values that peak at $436 against the $654 debit, which is also the maximum loss.

Calendars are LONG vega, unlike most short-premium trades. The back month has more vega than the front, so rising implied vol helps you. At 48% ATM on the front expiry, PLTR is the 5th richest of the 20 underlyings on this site — calendars are best opened when front-month vol is rich relative to the back.

Because the legs expire on different dates, there is no single expiry payoff: the numbers on this page are marked to model at the near expiry (October 30, 2026) using each leg's own implied vol — the same convention the builder uses.

Early assignment on the short call — particularly near an ex-dividend date — leaves you short 100 shares against a long back-month call. Manageable, but it turns a quiet position into a margin conversation.

Vol term structure can move against you: if back-month IV falls while front-month holds, the position loses on vega even with the stock exactly where you wanted it.

Pinning is not exotic. The most likely single close for a quiet underlying is near the strike you bought, and that is where a long-vol structure loses the most.

Owning vol on a 50-vol name is expensive by construction, and Palantir's realized has been high enough often enough to make it defensible. The strangle is the better instrument than the straddle here — the distribution is wide enough that the cheaper wings still get reached.

PLTR's Oct 30 strikes are $2.5 apart near the money (1.32% of spot). That is a coarse ladder: one rung is a large fraction of the implied move, so precision on the short strike is an illusion. 22k contracts of open interest on Oct 30 is workable around the money and thin in the wings — width costs more here than the ladder suggests. 38 strikes on that expiry — 95% of the board — carry prints that agree with their own implied volatility and hold up across the ladder, and those are the strikes priced here. Retail-deep with a fine strike ladder and real weekly open interest; one of the few high-vol names where four legs fill cleanly.

The surface is close to flat: only 0.7% between the 25-delta put and the 25-delta call. With so little skew, the wings on either side cost about the same in vol terms — unusual, and worth exploiting if your view is one-sided. The term structure is in contango: the back month implies 10.3% more vol than the front. Calm now, uncertainty later — which rewards selling the front month and makes the back month an expensive thing to own outright.

At 48% ATM implied vol, the Oct 30 options are pricing a one-standard-deviation move of $27.37 over 33 days — roughly −14.4% to +14.4%, or $162.3 to $217.04. Owning vol here means believing PLTR covers more than 14.4% in 33 days, and covering it in time.

What actually goes wrong here, as opposed to in general: Running the wheel on a position size that assumes assignment is unlikely. On this name assignment is the plan, and the drawdown after it is the part people are unprepared for.