Atos (ATOS) cuts $100M Jefferies ATM to $0, effective Feb 20, 2026

Rhea-AI Filing Summary

Atos Therapeutics, Inc. amended its ATM facility. The prospectus supplement states the company reduced the Maximum Offering Price under its Open Market Sale with Jefferies LLC from $100,000,000 to $0, effective as of February 20, 2026.

No shares have been sold under the ATM Facility as of the date of the supplement.

Insights

Capital Markets Counsel

Reduction of ATM capacity to zero is an administrative amendment; timing and cash impact depend on subsequent actions.

The supplement explicitly states the Maximum Offering Price under the Open Market Sale with Jefferies LLC was reduced from $100,000,000 to $0 and is effective as of February 20, 2026. The filing also notes that no shares have been sold under the ATM Facility.

This change removes available at‑the‑market capacity; any future ability to sell common stock via the ATM would require a new registration or amendment. Cash‑flow treatment is not discussed in the excerpt.

Filed Pursuant to Rule 424(b)(3)

Registration No. 333-279367

Prospectus Supplement

(To Prospectus dated May 23, 2024)

This prospectus supplement supplements and amends the prospectus dated May 23, 2024 (the “Prospectus”), as supplemented and amended by that certain prospectus supplement dated November 19, 2024 covering the offering, issuance and sale of up to a maximum aggregate offering price of $100,000,000 (the “Maximum Offering Price”) of our common stock that may be issued and sold under an Open Market Sale Agreement^SM with Jefferies LLC (the “ATM Facility”).

Effective as of February 20, 2026, we have reduced the Maximum Offering Price to $0. As of the date of this prospectus supplement, no shares have been sold under the ATM Facility.

You should read this prospectus supplement, together with additional information described under the headings “Information Incorporated by Reference” and “Where You Can Find Additional Information” in the Prospectus carefully before you invest in our securities.

Investing in our securities involves a high degree of risk. Before making any investment in our securities, you should consider carefully the risks and uncertainties described in the section entitled “Risk Factors” beginning on page 7 of the Prospectus.

The date of this prospectus supplement is February 20, 2026.

FAQ

What did ATOS change in its ATM facility?

ATOS reduced the Maximum Offering Price under its Jefferies ATM from $100,000,000 to $0. The prospectus supplement states this change is effective as of February 20, 2026, and no shares had been sold under the facility.

Has ATOS sold any shares under the Jefferies ATM facility?

No. The prospectus supplement states no shares have been sold under the ATM Facility as of the supplement date. The supplement accompanies the Prospectus and updates the facility capacity to $0 effective February 20, 2026.

Does the supplement say why ATOS reduced the ATM to $0?

The excerpt does not provide a reason for the reduction. It only states the Maximum Offering Price was reduced to $0 and that investors should review the Prospectus' Risk Factors for related considerations.

Can ATOS sell shares through this ATM after the reduction?

Not under the currently stated terms: the supplement sets the Maximum Offering Price at $0. Any future sales via an ATM would require a new registration statement or a further amendment to restore capacity.

Where can investors find more details about this change?

The supplement refers readers to the Prospectus and sections titled Information Incorporated by Reference and Where You Can Find Additional Information. Those sections contain the broader disclosure and risk factors referenced in the supplement.