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Anchor Investor Lock-in Date Calculator

Enter an IPO's anchor allotment date to see exactly when anchor investors' shares unlock — half after 30 days, the rest after 90 days, per SEBI's staggered anchor lock-in rule. Useful for anticipating anchor-driven selling pressure around those dates, not for tracking your own retail allotment.

50% Unlocks

31 Jan 2026

30 days from anchor allotment — half of the anchor investors' allotted shares become free to sell.

Remaining 50% Unlocks

01 Apr 2026

90 days from anchor allotment

These are calendar days, not trading days. This rule applies only to the anchor investor (QIB) category — retail investors have no lock-in at all and can sell from listing day. Knowing these dates helps you anticipate anchor-driven supply on the stock, not track your own shares.

How the Anchor Investor Lock-in Date Calculator works

An anchor investor is a large Qualified Institutional Buyer (QIB) — a mutual fund, insurance company or similar — allotted shares one trading day before an IPO opens for the general public, at a fixed price, partly to build market confidence in the issue ahead of the public bidding window.

Per SEBI ICDR Regulations, anchor investor shares are locked in on a staggered schedule: 50% for 30 days from the date of allotment, and the remaining 50% for 90 days from the date of allotment. Splitting the lock-in this way avoids a single cliff-edge date where all anchor shares become sellable at once, which could otherwise create a sudden supply shock in the stock.

This rule applies only to the anchor investor category — it has no effect on retail, NII or regular QIB allottees, none of whom have any lock-in and can sell from the day of listing. Tracking these dates matters for understanding potential selling pressure on a stock around its 30-day and 90-day marks, not for your own holdings unless you were yourself an anchor investor.

Disclaimer: This calculator is for educational purposes only and does not constitute investment advice. Always read the Red Herring Prospectus and verify current rates before applying for any IPO.

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Frequently Asked Questions

What is an anchor investor in an IPO?
A large Qualified Institutional Buyer (QIB) — such as a mutual fund or insurance company — allotted shares a day before the public issue opens, at a fixed price, partly to signal confidence in the issue to other investors.
Why is the anchor lock-in split into 30 days and 90 days?
SEBI staggers the unlock into two tranches (50% at 30 days, 50% at 90 days) to avoid a single date where all anchor shares become sellable at once, which could otherwise create a sudden supply shock and pressure the stock price.
Do retail investors have a lock-in period too?
No. The anchor lock-in rule applies only to the anchor investor (QIB) category. Retail, NII and regular QIB allottees have no lock-in at all and can sell their shares from the day of listing.
Is the lock-in counted from the allotment date or the listing date?
From the anchor allotment date, which is typically one trading day before the IPO's listing date. If you only know the listing date, using it instead will normally be accurate to within a day.
Why should I care about anchor lock-in dates if I'm not an anchor investor?
The unlock dates mark points where a large block of shares could come up for sale, which is useful context for understanding potential price pressure on a stock in the weeks and months after listing.