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Short Put Expiration Risk: Assignment, After-Hours Moves and Pin Risk
Expiration can look simple on the option chain but become operationally messy when the stock finishes near the strike.
Expiration is not just a closing bell event
Option exercise decisions and broker processing can extend beyond the regular-session close. After-hours stock moves can therefore matter to final outcomes.
Near-the-money options create uncertainty
A put near the strike can move between in-the-money and out-of-the-money status late in the day. That can create uncertainty about assignment.
Automatic exercise thresholds are not a complete plan
Clearing and broker procedures may use exercise-by-exception conventions, but holders can sometimes submit contrary instructions. Sellers should not rely solely on an assumed automatic threshold.
Assignment can create weekend exposure
An assigned equity position can leave the investor carrying stock risk into the next session, including weekend or overnight gaps.
Closing removes operational ambiguity
Buying back a nearly expired short put can eliminate assignment uncertainty, although execution cost and liquidity still matter.
Define an expiration policy
A written policy should specify whether short puts may be held through expiration and under what conditions. Operational risk deserves its own rule.
Use a written options process
Define winner management, time exits, loser decisions, assignment capacity and portfolio limits before the trade is under pressure.
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When to Close · 50% vs. 80% · 21 DTE vs. Profit Target · Tested Strike · Roll vs. Assignment · Rolling for Credit · Early Assignment · Expiration Risk · When Not to Roll