IPO Learning Guide
Anchor investors — large institutional investors allotted shares a day before an IPO opens — are required to hold those shares for a fixed period under SEBI rules before they can sell. This anchor investor lock-in period is closely watched because its expiry can trigger a wave of selling and price volatility in a newly listed stock.
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Anchor investors are Qualified Institutional Buyers (QIBs) — mutual funds, insurance companies, foreign portfolio investors, and similar large institutions — who are allotted a portion of an IPO’s shares one day before the issue opens to the public, at a price fixed by the issuer. Their strong participation is often read as a vote of institutional confidence and can influence retail sentiment and GMP.
Under current SEBI ICDR rules, anchor investor shares are locked in across two tranches from the date of allotment:
This means a portion of anchor shares becomes sellable relatively early (around the 30-day mark), while the rest stays locked for a further two months. SEBI has revised these lock-in norms before and may do so again — always cross-check the exact tranche split against the specific IPO’s RHP and the latest SEBI circular.
Watching the calendar of anchor lock-in expiries alongside GMP and subscription trends gives a fuller picture of a stock’s near-term supply-demand dynamics after listing.
Under current SEBI rules, 50% of anchor shares are locked in for 90 days and the remaining 50% for 30 days from the date of allotment.
Not always — it depends on whether the anchor investors choose to sell. It does increase the sellable float on that date, which can add downward pressure if selling does occur.
Anchor investor allocation lists are disclosed by the exchanges (BSE/NSE) typically a day before the IPO opens, and are referenced in the company’s RHP and listing disclosures.
