IPO Allocation
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IPO Process Library · 07 Allocation & IPO Day
Last Updated | November 11, 2026
IPO Allocation & IPO Day
Allocation is how underwriters and the company decide who gets IPO shares. IPO day is what follows: pricing, the first trade, and the stabilization period. Most shares go to institutions, and retail investors often buy in the open market.
- Allocation is discretionary; the company and lead banks weigh investor quality, size, and long-term interest.
- The deal prices after the market closes; trading starts the next morning through an opening auction.
- Underwriters can support the stock using the greenshoe and stabilizing bids, within securities rules.
- Research and publicity are limited during the quiet period around the offering.
How allocation works
After the book closes, bankers recommend allocations and the company approves them. Large, long-term institutions with a record of holding shares tend to receive priority, while short-term or flip-oriented orders are cut back. Some deals reserve a portion for retail through brokerage platforms and for employees or friends through a directed share program. Allocations to retail are typically small relative to demand.
Pricing night
What happens on IPO day
Trading begins the morning after pricing. The listing exchange runs an opening auction to find the first trade price: on the NYSE, through its designated market maker process, and on Nasdaq, through its opening cross for IPOs. The opening price can differ widely from the IPO price, depending on demand that built after pricing. This gap is often called the IPO pop when positive, or a broken deal when the stock falls below the offer price.
Stabilization and the greenshoe
| If the stock... | Underwriters typically... |
|---|---|
| Trades well above the offer price | Exercise the greenshoe, buying extra shares from the company to cover the over-allotment. |
| Trades at or below the offer price | Buy shares in the market to cover the short position, which supports the price. |
Quiet period
Around an IPO, the company and underwriters must avoid promotional communications that go beyond the prospectus, a restriction often called gun-jumping. After the offering, underwriters' research publication is limited for a short period set by FINRA rules, and many banks begin coverage roughly a month after the IPO. The exact limits depend on company status and current rules.
Common questions
Why do retail investors rarely get IPO shares?
Underwriters prioritize institutions that provide large, stable orders and long-term ownership. Retail allocation exists but is generally limited.
Can an IPO trade below its offer price on day one?
Yes. That is called breaking issue, and underwriters may step in to support it.
Methodology & Sources
Synthesizes SEC rules and guidance (Securities Act of 1933, Exchange Act of 1934, Regulation S-K), NYSE/Nasdaq listing standards, FINRA rules, and public S-1 filings. Cross-checked against primary documents. Rules, thresholds, and timelines change; confirm current requirements with counsel before acting. General education, not legal or investment advice.
Author: Erwin Castro
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