Lock-in of promoter securities: minimum contributions and excess holdings face differing lock-in durations with capital expenditure exceptions. Specified promoter-held securities are subject to lock-in periods distinguishing minimum promoters' contribution and excess holdings; longer lock-ins apply when majority of net issue proceeds are for capital expenditure. SR equity shares remain locked until conversion to voting equity with parity to ordinary shares, and the term capital expenditure includes civil works, fixed assets, land, buildings, plant and machinery and repayment of loans taken for such expenditure.