An anchor investor is a QIB — a large institution such as a mutual fund, insurer or sovereign fund — that is allotted IPO shares one day before the public issue opens. Anchor participation is disclosed and comes with a mandatory lock-in (at least 30 days, with part locked for 90 days) on their shares.
Why it matters to you
The anchor book is an early confidence signal. When respected long-only funds anchor an IPO, it suggests institutional conviction in the valuation — useful corroboration if you already hold the company's unlisted shares. A weak or absent anchor book ahead of listing can be a caution sign.
Example: A pre-IPO holder grew more confident when several top mutual funds appeared in the anchor allotment, validating the price band they hoped to exit above.