Lock-In Period (IPO)
The lock-in period in an IPO context refers to the mandatory holding period during which certain categories of pre-issue shareholders — most importantly the promoters — cannot sell their shares after listing, with SEBI's ICDR Regulations 2018 specifying a lock-in of 18 months for the minimum promoter contribution and 6 months for the remaining promoter holding and certain non-promoter pre-IPO investors.
The lock-in period is a structural investor-protection mechanism in Indian IPOs designed to ensure that promoters and other pre-issue investors cannot immediately liquidate their stakes after the company lists, which could destabilise the market price and disadvantage post-IPO public shareholders. The lock-in obligations are governed by Chapter V of SEBI's ICDR Regulations 2018.
For promoters, the lock-in framework distinguishes between the 'minimum promoter contribution' and the remaining promoter holding. The minimum promoter contribution is the minimum percentage of post-IPO shares that promoters must hold (typically 20% of post-issue paid-up capital). This minimum contribution is locked in for 18 months from the date of allotment. Any shares held by promoters in excess of this minimum contribution are locked in for a shorter period of 6 months from the date of allotment. SEBI amended the lock-in periods in 2021 to shorten them from the prior norms of 3 years and 1 year respectively, recognising that excessively long lock-ins were an impediment to startup and new-age company IPOs where investors needed liquidity for fund lifecycle management.
For pre-IPO shareholders who are not promoters — such as private equity investors, venture capital funds, or strategic investors who held shares before the IPO — the lock-in period depends on the holding period of the shares and the nature of the holder. Shares allotted under ESOP schemes, sweat equity, and other pre-IPO placements are also subject to specified lock-in rules under the ICDR Regulations.
For anchor investors (large institutional investors who receive an allocation one day before the public offer), a specific lock-in applies: 50% of their allotted shares are locked in for 30 days and the remaining 50% for 90 days. This relatively short lock-in for anchor investors reflects the role of anchor investors as institutional validators of the IPO price rather than long-term sponsors.
For retail investors and QIBs who subscribe through the public offer, there is no lock-in period — they can sell their allotted shares on the listing day itself. This asymmetry — where pre-IPO holders are locked in but public subscribers are not — is intentional: it protects post-IPO investors from a deluge of selling by insiders immediately after listing.
Violations of lock-in provisions are treated seriously by SEBI. Pledging of locked-in shares as collateral for a loan is generally prohibited under the ICDR Regulations, except in limited circumstances. If locked-in shares are transferred in violation of the regulations, the transfer is void, and the transferor and transferee may face regulatory action.