
When a company goes public with an IPO, the demand for its shares often exceeds the supply. Allocation is the mechanism of distributing a limited number of shares among investors. Let’s explore how it works.
The company issues 10 million shares in the IPO. Investors have submitted requests for 50 million shares. Demand exceeds supply by 5 times—this is "oversubscription."
The broker or underwriter cannot give everyone 100% of their requests. They allocate the shares proportionally or according to other rules.
Proportional. If oversubscription is 5x, each receives 20% of what was requested. You asked for 100 shares—received 20.
Firm (by lots). Everyone receives a minimum lot (for example, 10 shares), the remainder is distributed among large requests.
Priority. Institutions (funds, banks) go first, then retail investors.
1. Submit a realistic request. Do not inflate—will get less anyway.
2. Use multiple brokers. If you have accounts with different brokers, participate through each.
3. Prepare for low allocation. Expect to receive 10-30% of your request.
4. Have a post-listing plan. If you got little, you can buy more on the secondary market.
Overallotment. Underwriter’s option to issue additional shares (usually 15%) if demand is high.
Oversubscription. Situation where demand exceeds supply.
Greenshoe. Same as overallotment—a mechanism to stabilize the price after listing.
Lock-up Period. 90-180 days post-IPO, insiders can’t sell shares.
If you did not get the desired allocation:
"Stock Broker" receives IPO quotas and distributes them among clients. The size of your allocation depends on the size of the request and the overall oversubscription.
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