Anchor Lock-In Expiry Impact: 30-Day vs 90-Day Free-Float Release & Post-Listing Volume Study

# Anchor Investor Lock-In Expiry: 30-Day vs 90-Day Analysis

Under SEBI regulations, institutional investors allocated shares in the Anchor Investor Quota (allotted one day prior to the public IPO open date) are subject to mandatory trading lock-in periods to prevent immediate dumping on listing day.

In April 2022, SEBI revised the anchor framework from a simple 30-day lock-in to a bifurcated 30-day and 90-day schedule. This guide explains the mechanics of anchor lock-in releases, the resulting supply shocks, and historical post-expiry price action.

1. The SEBI 50:50 Anchor Lock-in Architecture

When a company raises anchor capital:

• 50% of the Anchor Allocation: Locked in for 30 Days from the date of allotment.
• Remaining 50% of the Anchor Allocation: Locked in for 90 Days from the date of allotment.

Why SEBI Introduced This:

Previously, 100% of anchor shares hit the market simultaneously on Day 31, causing severe price volatility and panic selling in newly listed stocks (e.g., Paytm, Zomato, Nykaa). Staggering the unlock into two 50% tranches smooths secondary market liquidity.

2. The Supply Shock Mechanism: What Happens on Unlock Days?

`` Day T: Listing Day (Anchors Frozen) -> Day T+30: 50% Anchor Shares Unlocked -> Day T+90: Remaining 50% Anchor Shares Unlocked ``

On the morning of the 30-day and 90-day expiry dates:

1. Free-Float Expansion: The actively tradeable floating shares in the market suddenly increase by 20% to 50%.
2. Short-Term Price Pressure: Anchor funds seeking to rebalance or book quick profits place market sell orders, leading to temporary price drops of 2% to 6% around the opening bell.
3. Institutional Absorption: Quality fundamental stocks witness high institutional buying absorption, where mutual funds use the anchor unlock dip to accumulate large positions without moving the market price upward.

3. High-Conviction Strategy for Retail Investors

• Avoid Buying 2–3 Days Before Lock-In Expiry: If a recently listed stock is trading near an anchor unlock date, wait for the supply absorption before entering fresh positions.
• Check Anchor Quality: If the anchor book is dominated by long-only sovereign wealth funds (GIC, ADIA, Temasek) and domestic mutual funds, selling pressure is minimal. If dominated by hedge funds, expect heavy profit-taking.

Track upcoming anchor allocation announcements on our IPO Calendar.

Disclaimer: This analysis is for educational purposes only.