How IPO Allotment Works in India (SEBI Rules Explained)

SEBI categorizes public issue applicants into three primary buckets, each with an earmarked reservation quota:

1. Retail Individual Investors (RII): Individuals (including NRIs and HUFs) who apply for up to ₹2,00,000 in equity shares. Typically, at least 35% of the net issue is reserved for retail applicants in profitable companies (or 10% in book-built issues meeting alternative profitability criteria).

2. Non-Institutional Investors (NII / HNI): High Net-worth Individuals, trusts, and corporate bodies bidding for more than ₹2,00,000. SEBI further subdivides NII into Small NII (bidding between ₹2 Lakh and ₹10 Lakh) and Big NII (bidding over ₹10 Lakh). Usually, 15% of the issue is reserved for NII.

3. Qualified Institutional Buyers (QIB): Mutual funds, foreign portfolio investors (FPIs), banks, and insurance corporations. Typically 50% of the issue is allocated to QIBs.

SEBI ICDR regulations prioritize giving the maximum number of individual investors at least one minimum lot. Here is how the algorithm executes:

Scenario A: Issue is Undersubscribed or Subscribed 1x: Every eligible retail applicant receives full allotment for all lots applied for.

Scenario B: Modest Oversubscription (Available Lots >= Number of Applicants): Every valid retail applicant is allotted exactly one minimum lot. Any remaining shares are then allotted proportionally to applicants who bid for multiple lots.

Scenario C: Heavy Oversubscription (Number of Applicants > Available Lots): Because there are fewer total lots than eligible applicants, SEBI mandates a random, computerized lottery draw supervised by the exchange and independent auditors. Winning applications receive exactly 1 minimum lot, while the remaining applicants receive 0 shares.

Since SEBI modified NII allotment regulations, allocation for Non-Institutional Investors is also based on a draw of lots for the minimum NII application size, rather than pure proportional allocation across the board:

1. Small NII (sNII / bNII): Bids between ₹2,00,000 and ₹10,00,000. If oversubscribed, a computerized lottery selects winners who receive the minimum sNII lot value (approx. ₹2,00,000). One-third of the NII portion is reserved for this bucket.

2. Big NII (bNII): Bids exceeding ₹10,00,000. Two-thirds of the NII portion is reserved for this bucket. Winners in an oversubscribed issue receive the minimum bNII allocation, with remaining shares distributed proportionally.

Once public bidding ends, the registrar performs technical scrutiny to reject invalid or duplicate bids (such as multiple applications on one PAN).

Next, in consultation with the Designated Stock Exchange (NSE or BSE), the registrar prepares the "Basis of Allotment" document. This audited table specifies the exact ratio of allotment (e.g. "1 out of every 14 valid applicants was allotted 15 shares in the retail category").

Once approved by the exchange, the registrar uploads the final data to its query servers and instructs banks to initiate fund debits and unfreeze unallotted ASBA amounts.

While no strategy guarantees a win in a random lottery, these regulatory best practices legitimately maximize your odds:

1. Apply Using Multiple Demat Accounts Belonging to Family Members: Submitting 1 lot each from individual PAN cards of family members multiplies your lottery entries legally. Never submit multiple applications from the same PAN card, as all duplicate bids are rejected by registrar algorithms.

2. Always Bid at the "Cut-off Price": Retail investors have the option to tick the cut-off price box. This ensures your bid remains valid even if the issuing company finalizes the upper end of the price band.

3. Avoid Last-Minute Mandate Delays: Submit your bid and approve the UPI mandate well before the 5:00 PM cut-off on the final day to prevent banking gateway timeouts.

4. Maintain Sufficient Account Balance: Keep your bank account funded until the final refund date so the bank can debit your account without mandate failure.