Charm is the reason the market so often gets magnetized to a strike into the 4pm bell. It’s time working on delta, and in the 0DTE era, it’s a dominant close-of-day force.
Charm (also called delta decay) measures how an option’s delta changes purely from the passage of time. It’s a second-order Greek, and in the 0DTE era it’s a major driver of the end-of-day pin.
What charm does
As expiration approaches, options’ deltas migrate toward 0 (out-of-the-money) or 1.0 (in-the-money) — that drift with time is charm. Dealers hedging their books must adjust for it continuously, and near expiration on a heavy 0DTE day, that adjustment becomes a powerful, predictable flow into the close.
Charm and the end-of-day pin
“Charm pressure” is often what produces the EOD pin — the market gravitating toward a big strike as dealers bleed off delta exposure into 4:00pm. It’s a big reason the last hour so often drifts toward and sticks near a round number, especially on OPEX.
Charm is time pulling delta toward its endpoint. Into the close, that pull becomes the invisible hand pinning price to the nearest heavy strike.
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