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Why stop-losses can gap on expiry days

By the OptionGrow research deskReviewed by Ms. Simran Sunil Patil, Research Analyst24 Sep 2026 · 6 min read

A stop-loss is an instruction, not a guaranteed price. On expiry days, thin liquidity and fast moves can fill orders well beyond the level you set.

This article is educational. It describes how a concept shows up in Indian index and stock options. It does not recommend a trade, a strike or a position size.

What to look for

A stop-loss is an instruction, not a guaranteed price. On expiry days, thin liquidity and fast moves can fill orders well beyond the level you set. The useful question is what would make the observation stop being relevant, and how large a loss of premium you can accept if it does.

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