Follow-On Offerings and ATM Programs

Once a company has already gone public, it can still sell new shares to raise more cash — this is called a follow-on offering (or secondary offering). In a traditional follow-on, the company works with underwriters to sell a large, fixed block of new shares all at once, usually priced at a small discount to the current market price to guarantee the deal gets fully subscribed. Because a big chunk of new shares hits the market on a single day, the stock price often drops noticeably around the announcement — existing shareholders' ownership stake gets diluted, and the market has to absorb a sudden supply increase.

An at-the-market (ATM) program is a gentler alternative: the company registers a shelf of shares it's allowed to sell over time, then drips small amounts into the market through a broker whenever conditions are favorable, often just a sliver of daily trading volume at a time. Because the selling is spread out and opportunistic rather than announced as one event, ATM programs typically cause much less price impact and are common among growth companies and REITs that need a steady trickle of capital.

The core tradeoff is speed versus stealth: a traditional follow-on raises a known, large amount of capital immediately but signals urgency and dilutes visibly; an ATM program raises capital more slowly and quietly but gives management flexibility to sell only when the stock price is attractive.