Lock-in rules impose specified locked-in periods for preferential allotments, differing for promoters, non promoters and convertibles. Preferentially allotted specified securities and shares derived from warrants or conversions are subject to differentiated lock-in periods: promoters/promoter group allotments locked for 18 months (with a 20% total capital cap and excess shares locked for six months); non-promoters locked for six months; unlisted convertibles or warrants locked for one year from allotment; conversion of convertibles reduces equity lock-in to the extent convertibles were already locked; pre-preferential holdings are locked for 90 trading days; unpaid recalculated price extends lock-in until payment; change-in-control allottees follow promoter lock-in rules.