Glossary term
At-the-Market Offering (ATM)
An at-the-market offering is a program that lets a public company sell newly issued shares into the open market over time instead of all at once.
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Written by: Editorial Team
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What Is an At-the-Market Offering (ATM)?
An at-the-market offering is a program that lets a public company sell newly issued shares into the open market over time instead of all at once. Rather than launching one large overnight stock sale, the company works through a sales agent and gradually sells shares at prevailing market prices when it chooses to do so.
Key Takeaways
- An ATM lets a company sell stock gradually into the public market.
- It usually operates under an effective shelf registration.
- The company can choose when, how much, and whether to sell shares under the program.
- ATMs can create ongoing share issuance and dilution even without a big headline offering.
- Investors should focus on how much stock is actually sold, not just the size of the authorized program.
How an ATM Offering Works
In an ATM program, the company enters into a sales agreement with a broker-dealer or sales agent that is authorized to sell shares for the issuer from time to time. The shares are sold into the market at prevailing prices rather than at a single fixed offering price negotiated in a traditional follow-on deal. The company can usually pause, resume, or stop sales depending on its financing needs and the stock's trading conditions.
This structure gives management more flexibility than a one-time overnight sale. It can raise capital gradually, which may be useful when the company wants to avoid a large single-day discount or does not need all the money at once.
ATM Versus a Traditional Follow-On Offering
Structure | How the shares are sold |
|---|---|
ATM offering | Gradually, into the market over time at prevailing prices |
In one larger transaction, often at a negotiated offering price |
The difference is practical, not just technical. A traditional offering creates a single visible event with a set deal size and price. An ATM can operate in the background for weeks or months, which means the financing impact may be spread out rather than concentrated in one announcement.
How ATM Programs Affect Share Supply
ATM programs can create steady capital raising and steady dilution at the same time. If the company sells meaningful amounts of stock through the program, the share count rises and existing holders own a smaller percentage of the business. That dilution may be acceptable if the company is using the proceeds productively or raising capital at attractive prices. But the effect can still weigh on per-share measures if issuance persists.
ATMs also change the market-supply picture. Investors may know the company has the ability to sell shares into strength, which can affect how they think about upside, valuation, and near-term stock pressure even before the company uses the full program.
What Investors Should Watch in an ATM Program
Investors should watch actual shares sold, gross proceeds raised, average sale prices, and how the company plans to use the money. The announced program size tells you the maximum flexibility management has asked for. It does not tell you how much financing will actually happen.
It also helps to connect the ATM back to the broader capital-raising story. A company using an ATM under a public offering framework may be doing so because it wants opportunistic financing flexibility, because it needs recurring cash, or because it wants to avoid the signaling effect of a single large marketed deal.
Example of an ATM Offering
Suppose a company puts a $100 million ATM program in place. That does not mean it instantly sells $100 million of stock. Over the next several months, it may sell only $15 million of shares when trading volume is strong and the price is favorable. If the stock weakens, it may pause the program. The result is more flexible financing than a single follow-on offering, but it can still increase share count and create dilution over time.
The ATM is therefore best understood as a financing tool, not a one-day event.
Where Investors See ATM Disclosures
Investors usually see ATM language in prospectus supplements, shelf-registration disclosures, sales agreements, earnings filings, and capital-markets announcements. The company may later report how many shares it sold and the proceeds raised during a quarter or another reporting period.
That means investors often have to follow the program over time instead of assuming the initial announcement tells the whole story.
The Bottom Line
An at-the-market offering is a program that lets a public company sell shares gradually into the market at prevailing prices. It gives the company flexible access to capital while creating the possibility of ongoing dilution and added share supply over time.