The term "secondary offering" gets used loosely in financial media, but it actually covers several distinct transaction types — some of which are highly dilutive and some of which aren't dilutive at all. Understanding the difference can save you from misinterpreting an SEC filing or misreading its impact on your position.
A follow-on offering (also called a dilutive secondary offering or primary offering) is when the company itself issues new shares and sells them to the public. The proceeds go to the company. Your existing shares now represent a smaller percentage of total shares outstanding. This is the classic dilutive event.
A "pure secondary" offering is when existing shareholders (insiders, early investors, private equity firms) sell their already-existing shares to the public. No new shares are created. The company receives no proceeds. Your ownership percentage doesn't change — but the float increases (more shares available to trade). This is technically non-dilutive, though it can signal insider selling.
Many offerings combine new company shares (primary/dilutive) with existing shareholder sales (secondary/non-dilutive). The dilution only comes from the new shares portion.
An ATM program is a continuous, low-announcement mechanism where the company sells new shares daily through a broker-dealer. Shares are sold into the open market "at the market price." It's dilutive and ongoing, but there's no single offering event — just a steady drip of new shares.
A registered direct offering is a private placement of already-registered shares to a small number of institutional buyers. The shares are already registered (can be traded immediately), which distinguishes it from a PIPE. The price is usually at a discount to market, making this highly dilutive in the near term.
| Offering Type | New Shares Created? | Dilutive? | Company Gets Cash? |
|---|---|---|---|
| Follow-On (FPO) | Yes | Yes | Yes |
| Pure Secondary | No | No (to share count) | No |
| Mixed Offering | Partially | Partially | Partially |
| ATM Program | Yes (ongoing) | Yes | Yes |
| Registered Direct (RDO) | Yes | Yes | Yes |
| PIPE | Yes | Yes | Yes |
For a traditional FPO: the company files a prospectus supplement (424B5) referencing an existing shelf registration, announces the offering (usually before or after market), prices shares (often at a discount of 5–10%), and closes within a few days. The stock typically drops on announcement and may recover as the offering is absorbed.
The company designates a broker-dealer to sell shares on its behalf over time. Shares are sold in ordinary market transactions — you can't see ATM selling in real time. But the 424B3 prospectus supplement filed with the SEC signals the program exists, and quarterly 10-Q reports disclose how many shares have been sold and at what price.
PIPE (Private Investment in Public Equity) transactions involve selling shares or convertible securities to institutional investors in a private placement. The shares are initially restricted but become freely tradeable when the company files a resale registration statement. Watch 8-K filings disclosing "Securities Purchase Agreements" — these are PIPE signals.
Registered direct offerings and PIPEs to small hedge funds with convertible notes are among the most dilutive structures for retail investors. They're done at discounts, often with warrants attached, and the institutional buyer has a strong incentive to short the stock to profit from the discount. Watch 8-K filings for "Securities Purchase Agreement" language and check if the buyer is a known PIPE investor.
Offering price impact depends on the offering type, size, and company quality:
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