# PIPE (private investment in public equity)

> A private sale of a public company's stock or convertible securities to selected investors, usually at a discount, registered for resale later.

Source: https://www.quantisnow.com/glossary/pipe
Topic: Glossary / IPOs and offerings
Also known as: PIPE, PIPE deal, PIPE financing, private investment in public equity, private placement
Last updated: 2026-10-27

A PIPE, or private investment in public equity, is a transaction in which a publicly traded company sells shares, or securities convertible into shares, directly to accredited or institutional investors in a private placement exempt from SEC registration. The company then registers the shares for resale so the buyers can eventually sell them publicly.

## How it works

The company negotiates terms with a group of investors, often through a placement agent, and signs a securities purchase agreement. Securities are sold under a private placement exemption (typically Section 4(a)(2) or Regulation D), so the company may file a [Form D](https://www.quantisnow.com/glossary/form-d), plus an 8-K for unregistered sales of equity under Item 3.02. A registration rights agreement requires the company to file a resale registration statement, often on Form S-3 or S-1, within a set time.

PIPEs can be common stock, convertible preferred, convertible notes, or shares with [warrants](https://www.quantisnow.com/glossary/warrants). Nasdaq and the NYSE generally require shareholder approval when a company issues 20% or more of its outstanding shares below a defined minimum price in a private deal, which is why many PIPEs stay just under that level.

PIPEs are standard in [de-SPAC](https://www.quantisnow.com/glossary/de-spac) transactions and biotech [reverse mergers](https://www.quantisnow.com/glossary/reverse-merger), where they guarantee cash at closing.

## Why it matters for traders

Who invests matters. A PIPE led by respected specialist funds, especially at or above market, can be read as validation and lift the stock. A deeply discounted PIPE with heavy warrant coverage signals a weak bargaining position. Watch the price versus the market, the investor list, warrant terms, and the resale registration's effectiveness date, after which PIPE shares can be sold.

## Example

Hypothetical Northwind Therapeutics (NWTX) trades at $12 with 30 million shares. It sells 5 million shares at $11 in a PIPE to a group of healthcare funds, raising $55 million. The new shares equal about 16.7% of the prior share count, below the 20% approval threshold. NWTX agrees to file a resale registration within 30 days.

## FAQ

### When can PIPE investors sell their shares?

Generally once the resale registration statement is effective, or later under Rule 144 if no registration is filed.

### Is a PIPE good or bad for a stock?

It depends on the terms and investors. A premium-priced PIPE from strong funds can be positive; a deep discount with warrants is usually negative.

## Related terms

- [Registered direct offering](https://www.quantisnow.com/glossary/registered-direct-offering.md): A sale of shelf-registered shares directly to a small group of pre-selected investors through a placement agent, often at a discount and with warrants.
- [De-SPAC](https://www.quantisnow.com/glossary/de-spac.md): The merger in which a SPAC combines with a private operating company, turning that company into a publicly traded business.
- [Reverse merger](https://www.quantisnow.com/glossary/reverse-merger.md): A transaction in which a private company becomes public by merging into an existing public company, bypassing a traditional IPO.
- [Warrants](https://www.quantisnow.com/glossary/warrants.md): Securities issued by a company that give the holder the right to buy its shares at a set exercise price before a set expiration date.
- [Dilution](https://www.quantisnow.com/glossary/dilution.md): The reduction in existing shareholders' ownership percentage and per-share claims on earnings when a company issues new shares.
- [Form D](https://www.quantisnow.com/glossary/form-d.md): The SEC notice a company files after first selling securities in an exempt private offering under Regulation D, disclosing the amount raised.

## On Quantisnow

- [Shelf offerings and dilution](https://www.quantisnow.com/guides/shelf-offerings-and-dilution)
- [Live feed: Offerings](https://www.quantisnow.com/news/offerings)
- [Public offerings](https://www.quantisnow.com/categories/offerings)
- [SEC Form 8-K filings](https://www.quantisnow.com/categories/8-k)