Calculate when anchor investor shares get unlocked after an IPO listing. Know the anchor lock-in expiry date for any Indian IPO.
Anchor shares unlock in two halves: 50% after 30 days and the remaining 50% after 90 days from anchor allotment (one day before IPO opening)This calculator counts both unlocks from the listing date as a close approximationAnchor investors, QIBs bidding 10 crore rupees or more a day before opening, can take up to 60% of the QIB portion, so their unlock calendar moves prices. SEBI splits it: 50% frees after 30 days, the rest after 90 days from anchor allotment. This calculator prints both dates from the listing day.
Why anchor lock-in expiry effect on share price trends twice per IPO: unlocks add sudden sellable supply, and partial anchor exits around these dates are common. Watch delivery volumes and bulk-deal data in both windows rather than fearing the date itself.
Anchors bid within the band and get allocated pre-open, so their cost basis sits near the issue price, which means any listing premium is already profit by unlock day. That explains the typical selling pressure pattern.
Qualified institutional buyers who invest in an IPO before it opens to retail investors, and stay locked in for a fixed period after listing.
It is split: 50% of the anchor allocation frees after 30 days and the remaining 50% after 90 days, counted from anchor allotment.
Only qualified institutional buyers (mutual funds, insurers, FPIs) bidding at least ₹10 crore in a single application.
Up to 60% of the QIB portion can be allocated to anchor investors, which is why their holding and selling behaviour moves the stock.
Often partially. Unlock dates are watched closely because anchor selling can add sudden supply and pressure the price — check delivery volumes around both dates.
Anchors bid within the price band and are allocated one working day before the issue opens, at the anchor allocation price decided by the company.
Last updated: 14 Oct 2026, 01:28 IST