An at-the-market equity offering (commonly abbreviated as an ATM offering or ATM program) is a continuous-offering mechanism that lets a public-company customer sell newly issued shares directly into the secondary market over an extended period, typically through one or more designated sales agents acting as principal or as agent. Unlike a traditional underwritten follow-on offering, an ATM does not price a fixed share count on a single closing date. Instead, the customer files a base shelf registration statement and a prospectus supplement establishing the ATM program, then instructs its sales agents to drip shares into the trading market during open windows, often over twelve to twenty-four months, until either the dollar-cap is exhausted or the program is terminated.
From a customer-success and testimonial-wall perspective, an ATM offering is structurally different from the follow-on equity offering, shelf registration, and PIPE investment milestones covered elsewhere in this series. The structural difference is that an ATM offering is a continuous-issuance mechanism rather than a discrete transaction — the program lives in the market for many months, the share count actually sold is indeterminate until the program ends, and the customer is subject to ongoing regulation-M and continuous-disclosure constraints throughout the program's life. The continuous nature produces three distinct testimonial-wall risks: program-confidentiality risk during open sales windows, regulation-M and selective-disclosure risk on testimonial-publication timing, and indeterminate-amount misrepresentation risk for any testimonial that quotes a specific dollar figure or share count.
This guide separates the ATM offering into four phases, explains what changes for the testimonial wall in each phase, and provides per-phase playbooks. The phases are structured around the program launch, the active-sales windows, the dormant windows between sales bursts, and the program termination or exhaustion.
The four phases of an at-the-market equity offering
An ATM offering, from prospectus-supplement filing to program termination or dollar-cap exhaustion, typically runs twelve to twenty-four months across the four phases.
Phase 1: Program launch and prospectus-supplement filing. The customer files a prospectus supplement establishing the ATM program, names one or more sales agents, sets a maximum dollar amount that can be sold under the program, and discloses the mechanics by which the agents will execute sales. The customer's existing shelf registration statement must be effective for the program to launch. The phase is characterized by setup disclosure and market-signaling concerns — investors and analysts react to the program's launch as a forward-looking signal about capital strategy.
Phase 2: Active-sales windows. The customer instructs its sales agents to begin selling shares into the market. Active windows are typically scheduled during open trading sessions when the customer is not in a quarterly blackout period and is not in possession of material non-public information. Sales execute incrementally over the window — sometimes thousands of shares per day, sometimes much larger blocks — at prevailing market prices. The customer reports the cumulative sales under the program in periodic SEC filings.
Phase 3: Dormant windows between sales bursts. Between active-sales windows, the program is technically open but the customer is not actively selling. Dormancy can be driven by blackout periods around quarterly earnings, by the presence of material non-public information, by management's strategic timing choices, or by adverse market conditions. The customer's disclosure obligations continue during dormant windows even though no sales are executing.
Phase 4: Program termination or exhaustion. The program ends in one of three ways — full exhaustion of the dollar cap, customer-initiated termination, or expiration of the underlying shelf registration. The program's final cumulative sales become a definitive disclosure point and a closing milestone for the testimonial wall.
Each phase has its own testimonial-wall risks. The biggest mistake is to treat an ATM offering like a single follow-on offering, ignoring the continuous-issuance dynamics and the regulation-M timing constraints that apply throughout the program's life.
Per-phase playbook for the testimonial wall
Phase 1: Program launch and prospectus-supplement filing
At program launch, the testimonial wall faces a market-signaling risk and an early-amount-misrepresentation risk.
First, do not characterize the maximum program size as a near-term raise. A typical ATM program will authorize, for example, a dollar cap of one hundred and fifty million dollars, but the customer may end up selling only thirty million dollars before the program is terminated or before the shelf expires. A testimonial that announces "the customer just raised one hundred and fifty million dollars" at program launch overstates the actual proceeds by a factor of five and creates an SEC and investor-relations problem.
The remediation is to characterize the program as a maximum authorization rather than as completed proceeds. Phrasings such as "the customer established a one-hundred-and-fifty-million-dollar at-the-market equity program" or "the customer has the capacity to issue up to one hundred and fifty million dollars under its newly launched ATM program" are accurate and do not overstate completed proceeds.
Second, audit pre-launch testimonials for capital-strategy implications. Some pre-ATM testimonials may include language about the customer's "well-capitalized balance sheet" or "minimal need for external capital" that can be misread as inconsistent with the program launch. The remediation is to refresh pre-launch testimonials that make absolute statements about capital posture and to replace them with copy that focuses on operational and product outcomes.
Third, queue Phase 2 testimonial-collection prompts for the active-sales windows. The most productive moment for testimonial collection on an ATM program is after the first material sales burst has been disclosed in a quarterly filing, when the program has demonstrated execution and is not in the speculation-driven launch phase.
Phase 2: Active-sales windows
During active-sales windows, the testimonial wall faces a regulation-M risk, a selective-disclosure risk, and a real-time-amount-drift risk.
Regulation-M risk. Regulation M restricts certain activities by issuers and affiliated parties during distributions of securities, and an ATM offering is a continuous distribution. While testimonial publication is generally not a regulation-M-restricted activity, testimonials that praise the customer's stock price, future trading levels, or near-term capital actions can blur the line. The remediation is to keep active-window testimonials focused on product, operational, and customer-outcome topics and to avoid stock-price language or near-term capital-action language during active-sales windows.
Selective-disclosure risk. Customers running an ATM program are subject to ongoing Regulation FD and selective-disclosure obligations. A testimonial that references material non-public information about the program's pace, the customer's anticipated proceeds, or the customer's strategic use of proceeds creates a selective-disclosure risk if the testimonial is published before equivalent information is publicly disclosed in an SEC filing or press release.
The remediation is to limit testimonial copy during active-sales windows to information that is already in the public record — the program's existence, the maximum authorized dollar amount, and the cumulative proceeds reported in the most recent SEC filing. Forward-looking pace and proceeds expectations should not appear in testimonial copy.
Real-time-amount-drift risk. During active windows, the cumulative proceeds change continuously as sales execute. A testimonial that quotes a specific dollar figure for "raised under the program" risks being stale within hours or days. The remediation is to quote cumulative proceeds only as of a specific disclosure date that matches the customer's most recent SEC filing, with phrasing such as "as of the customer's most recent quarterly disclosure, the customer had sold X million dollars under its ATM program."
Phase 3: Dormant windows between sales bursts
During dormant windows, the program is open but no sales are executing. The testimonial wall faces a dormancy-misinterpretation risk during this phase.
Dormancy-misinterpretation risk. A testimonial published during a dormant window can be misread as a signal that the program has ended, that the customer no longer needs the capital, or that the customer is permanently abandoning the program. None of these inferences may be accurate — the customer may simply be in a quarterly blackout, sitting on material non-public information, or waiting for better market conditions.
The remediation is to avoid program-status language in dormant-window testimonials. Testimonials should focus on operational and product outcomes and should not characterize the program as "completed," "winding down," or "no longer active" unless the customer has formally terminated the program or unless the customer's most recent SEC filing supports the characterization.
Blackout-window interaction with testimonial scheduling. Some testimonial-collection programs include scheduled customer-interview windows that may coincide with the customer's quarterly blackout. The remediation is to coordinate testimonial-collection scheduling with the customer's investor-relations and legal contacts so that interviews and review cycles do not cross into blackout windows, which can delay or block legal approval of testimonial copy.
Information rights for sales agents. Sales agents on an ATM program typically receive periodic updates from the customer. The remediation is to assume that sales agents may see testimonial copy that references the program and to keep testimonial copy in alignment with the customer's communications with its sales agents.
Phase 4: Program termination or exhaustion
The program ends via dollar-cap exhaustion, customer-initiated termination, or shelf-registration expiration. The testimonial wall faces a closure-narrative risk during this phase.
Closure-narrative risk. The three closure paths produce different narratives. Full exhaustion can be framed as a successful capital-raising execution; customer-initiated termination can be framed as a strategic choice to preserve dilution capacity or to switch to a different capital-raising mechanism; shelf expiration can be framed as a transition to a new shelf or to a different capital strategy. Each framing has its own accuracy boundary, and the testimonial wall must align with the actual closure mechanics.
The remediation is to align the closure-event testimonial with the actual closure mechanics:
- Full exhaustion: "the customer raised the full authorized amount under its ATM program"
- Customer-initiated termination: "the customer concluded its ATM program with cumulative proceeds of X million dollars" without implying that the cap was reached
- Shelf expiration: "the customer's ATM program expired with its underlying shelf registration" without implying strategic preference
Final-amount disclosure timing. The definitive cumulative-proceeds figure becomes part of the customer's next periodic SEC filing after the program ends. The remediation is to wait for the definitive disclosure before publishing testimonial copy that quotes the final program total, rather than relying on intra-quarter estimates that may differ from the audited figure.
Post-program capital-strategy interaction. After the program ends, the customer may pivot to a different capital mechanism — a follow-on equity offering, a convertible debt financing, or a private placement. Testimonial copy that praises the ATM program should be neutral on the customer's subsequent capital-strategy choices so that it does not become inconsistent with the customer's next move.
Common mistakes and how to avoid them
The most common testimonial-wall mistake on an ATM offering is treating the maximum authorized dollar amount as if it were realized proceeds. The cap is an authorization, not a raise — and the most likely outcome is partial utilization rather than full exhaustion.
The second most common mistake is publishing program-pace or program-proceeds language during active-sales windows that crosses the regulation-FD or selective-disclosure line. The conservative posture is to keep active-window testimonial copy focused on product and operational outcomes and to leave capital-action commentary to the customer's official disclosures.
The third most common mistake is allowing a stale cumulative-proceeds figure to remain in long-lived testimonial copy. The remediation is to refresh cumulative-proceeds references at every quarterly filing or, more simply, to use phrasings that do not depend on a specific running total.
Conclusion
An at-the-market equity offering is a continuous-issuance mechanism that differs structurally from a follow-on offering or a private placement. The testimonial wall must accommodate the continuous nature of the offering — the program lives in the market for many months, the actual proceeds are indeterminate until termination, and regulation-M and selective-disclosure constraints apply throughout the program's life. The four-phase playbook above — program launch, active-sales windows, dormant windows, and program termination — is the operational frame for managing testimonial-wall risk across the program's life. Customers running ATM programs benefit from testimonial copy that respects the continuous-disclosure dynamics rather than copy that imports a single-event framing from a more familiar transaction type.