IPO Kostak Rate Explained: How to Sell Your Application Before Allotment

What Is Kostak in IPO?

Kostak (also spelled "kostak" or "kostak rate") is the price a buyer pays to purchase an entire IPO application — not the shares themselves, but the application that may or may not receive allotment. The buyer pays a fixed amount upfront, and in return, receives the benefit of any allotment that comes from that application.

The word kostak comes from Gujarati trading terminology and has been part of India's grey market IPO ecosystem for decades. It is informal, unregulated, and operates entirely on trust and reputation within the operator network.

How a Kostak Trade Works

Suppose you applied for an IPO at the maximum retail limit. The IPO has a kostak rate of ₹3,000. Here's what happens:

1. You agree to sell your application to a grey market buyer for ₹3,000
2. The buyer pays you ₹3,000 upfront, regardless of whether you receive allotment
3. If you do get allotment, you transfer the shares to the buyer at the issue price (they pay you the issue price × number of shares)
4. If you do not get allotment, the buyer loses their ₹3,000 (or recovers it from other allotments they've purchased)

Your profit is a fixed ₹3,000 regardless of outcome — zero risk from your perspective once the deal is struck.

Kostak vs GMP: When to Choose Each

These two grey market instruments serve different risk profiles:

• Kostak: Guaranteed fixed profit, paid before allotment results. Best for investors who want certainty and are happy with a known, moderate return without listing-day risk.
• GMP-based exit: Variable profit, realised on listing day. Best for investors who received allotment and believe the listing will match or exceed the current GMP.

Example: If the kostak rate is ₹3,000 and GMP implies a ₹7,000 listing gain on a single lot, taking kostak means you leave ₹4,000 on the table if allotted — but you get paid even if not allotted. Whether this trade-off is worth it depends on your allotment probability and risk tolerance.

Subject-to-Sauda: A Related Instrument

Subject-to-sauda is similar to kostak but the buyer only pays if allotment occurs. You receive payment equal to the GMP per share × number of allotted shares after allotment day. Unlike kostak (which is allotment-risk-free for the seller), subject-to-sauda means you only profit if allotted.

The key difference: kostak guarantees income regardless of allotment; subject-to-sauda pays per share on allotment day at the agreed GMP rate.

Risks and Considerations

• Counterparty risk: Kostak and subject-to-sauda operate on informal trust. There is no legal recourse if the buyer defaults.
• Legal grey area: SEBI does not explicitly permit or ban kostak trading. It is informal and operates outside formal exchange mechanisms.
• Demat account access: Some kostak buyers ask for demat credentials to manage the share transfer themselves — never share your login credentials with anyone.

Kostak is most commonly used by retail investors applying in multiple family accounts who want to lock in guaranteed returns from some accounts while holding the rest for listing-day gains. It is a portfolio risk management tool, not a necessity for every IPO application.