What is a Lock-In Period?
A lock-in period is a mandatory time frame during which certain categories of shareholders are prohibited from selling their IPO shares after the company lists on the stock exchange. Lock-ins are imposed by SEBI to prevent insiders and early investors from dumping shares immediately after listing — which would unfairly disadvantage retail investors who paid the IPO price.
Lock-in rules in India are specified by SEBI's ICDR (Issue of Capital and Disclosure Requirements) Regulations. Different categories of shareholders face different lock-in periods.
Categories of Lock-In in Indian IPOs
1. Promoter Lock-In
Promoters (founders and controlling shareholders) face the strictest lock-in requirements:
- 20% of post-IPO promoter shareholding: Locked in for 18 months from the date of allotment
- Remaining promoter shareholding: Locked in for 6 months from allotment date
This means promoters cannot sell all their shares for at least 6 months after IPO, and their core 20% stake is locked for 18 months. This aligns promoter interests with the company's long-term performance.
SEBI amended these rules in 2021 (and further clarifications followed) to reduce the 3-year lock-in that existed earlier to 18 months for most promoter holdings, making Indian IPOs more attractive to promoters while still protecting investors.
2. Anchor Investor Lock-In
As discussed in our anchor investor article:
- 50% of anchor allotment: Locked in for 30 days from allotment
- Remaining 50%: Locked in for 90 days from allotment
Note: SEBI revised anchor lock-in rules — the earlier blanket 30-day rule was updated to have a staggered 30/90-day structure in 2021 for larger portions. The exact split may vary based on the specific SEBI circular applicable to the IPO — always verify in the RHP.
3. Pre-IPO Investor Lock-In
Shares allotted to investors in pre-IPO rounds (also called "pre-IPO placement" or "pre-issue placement") within 1 year before the IPO are typically locked in for 6 months from allotment. This prevents companies from quickly raising pre-IPO funds at a discount and immediately dumping them on IPO investors.
PE/VC investors who have held shares for more than 1 year before the IPO typically have no lock-in and can sell on listing day itself through the OFS route (if offered) or in secondary markets.
4. Employee Stock Options (ESOPs)
ESOPs that were exercised before the IPO (converted to shares) are subject to lock-in as per SEBI rules. Typically, ESOP shares are locked in for at least 1 year from allotment date.
5. Public/Retail Investor Lock-In
Retail investors who receive allotment in an IPO have no lock-in. They can sell from Day 1 of listing. This is a key distinction — retail investors have full liquidity from the listing day.
How Lock-In Expiry Affects Stock Price
Lock-in expiry dates are important events on any IPO investor's calendar. When a large block of shares becomes freely tradeable, it can create selling pressure — particularly from:
- Pre-IPO investors sitting on large gains who have been waiting for lock-in expiry
- Promoters who want to diversify their personal wealth after 6 months
- Anchor investors at the 30-day mark (though with only 50% of their holding now free)
Historical data shows many IPO stocks experience a dip in the weeks before and after major lock-in expiry dates. This is a known pattern that savvy investors factor into their exit timing.
Calculating Lock-In Expiry Dates
Lock-in dates are calculated from the date of allotment (not the listing date or subscription close date):
- Allotment date: typically T+6 from subscription close (T = last day of subscription)
- Listing date: typically T+6 to T+7 from subscription close
- 6-month promoter lock-in: allotment date + 6 months
- 18-month promoter lock-in: allotment date + 18 months
- Anchor 30-day lock-in: allotment date (which is listing day - 1 day) + 30 days
Lock-In and Pledging
Even locked-in shares can be pledged as collateral for loans. Promoters sometimes pledge their locked-in shares to raise funds. This is not the same as selling, but heavy promoter pledging of locked-in shares signals financial stress and is a risk factor to monitor. The DRHP and subsequent stock exchange filings disclose pledged shareholding.
Key Takeaways
- Retail IPO investors have no lock-in — they can sell from Day 1
- Promoters are locked in for 6–18 months depending on the portion of their holding
- Pre-IPO investors locked in for 6 months if they invested within 1 year before IPO
- Anchor lock-in is 30/90 days (split structure)
- Lock-in expiry dates can create selling pressure — track them for IPOs you hold
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