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Nifty weekly options expire on Tuesday. The day before and the morning of expiry do not behave like the rest of the week, because time decay speeds up and the contest around Max Pain is settled in a few hours. Version 2 (October 8, 2026): the description of how the closing value is formed was corrected, and sources were added. AION Analytics research note. Canonical version: https://aionanalytics.in/research/notes/expiry-week-mechanics
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Lokesh Gupta (2026) studied this question.
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