An ATM offering (at-the-market) is a registered program allowing a public company to issue and sell shares into the market from time to time through a sales agent, at prices near current trading levels.

How it works

The company files a shelf registration and signs an equity distribution agreement with a bank acting as agent. Management sets parameters — daily volume limits, minimum price, blackout windows — and the agent sells newly issued shares on the exchange when conditions are met. Proceeds fund R&D, acquisitions, or balance sheet strength.

Unlike a traditional follow-on offering priced overnight with a roadshow, ATM sales can happen over months with less fanfare. Disclosure appears in quarterly filings showing shares sold and average prices. Biotech and growth tech companies that recently IPO’d often adopt ATMs to manage cash between clinical or product milestones.

Private startups do not use ATMs; the concept matters to venture holders when portfolio companies go public and later tap markets without a formal secondary.

Why it matters

• Founders (post-IPO): ATMs provide optionality but dilute existing holders incrementally. Coordinate with IR and legal on Reg FD and material nonpublic information.
• Investors: Monitor 10-Q footnotes for ATM activity; silent dilution affects ownership without a headline event.
• Operators: Treasury and finance forecast runway including potential ATM capacity on the shelf.

Common mistake

Assuming ATM sales have zero market impact. Heavy daily issuance can weigh on the stock; boards still need a narrative when investors notice rising share count.

Related ideas

Follow-on offering, shelf registration, public float, and /glossary/bookrunner roles in marketed offerings.