What is an anchor investor? SEBI IPO rules (2026)

An anchor investor is a large institution that is allotted shares in an IPO one day before the issue opens to the public. The role exists under SEBI's ICDR rules to bring committed institutional demand into a book-built offer early. An anchor investor is not a special class of buyer with private information. It is a qualified institutional buyer that agrees to a larger minimum bid and a lock-in in exchange for an early, disclosed allotment.

How the anchor book works

Anchor investors bid one working day before the IPO opens to retail and other investors. Issuers can allocate up to 60 percent of the qualified institutional buyer portion to anchors. The minimum bid is 10 crore rupees for a mainboard IPO and 1 crore rupees for an SME IPO. Because the allotment happens first and is published, the anchor book acts as an early demand signal that the rest of the market can see before applying.

Why the lock-in matters

Anchor shares are not freely tradable at listing. Under SEBI rules, half of an anchor's allotment is locked in for 30 days from the date of allotment, and the other half for 90 days. The lock-in is designed so early institutional demand cannot simply flip on listing day. SEBI has also revised the anchor framework over time, including changes effective in late 2025 to broaden the number of anchor allottees. Always read the current offer document for the exact terms of a given IPO.

How to read an anchor allocation

The anchor allocation is a public disclosure. It is published on the NSE and BSE websites, usually one day before the issue opens, and it lists the anchor names, the shares each received, and the allotment price. When you read one, a few things are worth checking:

• Who the anchors are. Domestic mutual funds, insurers, and foreign portfolio investors show up here.
• The allotment price. It is set before the public issue and disclosed.
• Concentration. A book spread across many institutions reads differently from one concentrated in a few.

Anchor investing sits alongside other institutional routes into a company's stock, such as a qualified institutional placement and an offer for sale. Many anchors are foreign portfolio investors, whose holdings later surface in the quarterly shareholding pattern. For the step-by-step, how to find anchor investors in an IPO shows where the disclosure lives.

Flock reads primary filings and disclosures like these, dates each one, and links back to the source. What the data means for you is your call to make.