Astrotech readies $50M at-the-market stock capacity

Astrotech Corp. (ASTC) previously registered up to $24,492,819 of common stock for sale in an at-the-market program through H.C.

Rhea-AI Filing Summary

Astrotech Corp. (ASTC) previously registered up to $24,492,819 of common stock for sale in an at-the-market program through H.C. Wainwright & Co. From June 3, 2026 to this supplement date, the company sold 258,856 shares for gross proceeds of approximately $7.9 million.

This supplement terminates the continuous offering under the June Prospectus effective August 19, 2026, and no further shares will be sold under that document. The at-the-market Offering Agreement remains in effect, and any future sales of common stock under it will be made pursuant to a new August 19, 2026 prospectus supplement to the company’s S-3 shelf, which covers up to $50 million of common stock.

Key Figures

Last reported share price: $7.94 per share ATM capacity under June Prospectus: $24,492,819 Shares sold under June Prospectus ATM: 258,856 shares +2 more

5 metrics

Last reported share price $7.94 per share Common stock on Nasdaq Capital Market as of August 19, 2026

ATM capacity under June Prospectus $24,492,819 Common stock registered for offer and sale pursuant to the Offering Agreement

Shares sold under June Prospectus ATM 258,856 shares Common stock sold from June 3, 2026 through date of this supplement

Gross proceeds from ATM sales $7.9 million Approximate gross proceeds from 258,856 shares sold under the Offering Agreement

New ATM shelf capacity $50 million Shares of common stock covered by August 19, 2026 prospectus supplement to S-3 Registration Statement

Key Terms

at the market offerings, shelf registration statement, base prospectus, prospectus supplement

4 terms

at the market offerings financial

"as sales agent, in “at the market offerings” as defined in Rule 415"

At-the-market offerings are a way for a company to raise cash by selling newly issued shares directly into the open market at the current trading price through a broker, rather than in a single large sale. Think of it like topping up a gas tank a little at a time at whatever the pump price is; it gives the company flexibility to raise money when conditions are favorable but can increase the number of shares outstanding and dilute existing investors, and frequent or large sales can put downward pressure on the stock price.

shelf registration statement financial

"the Company filed a shelf registration statement on Form S-3"

A shelf registration statement is a document a company files with regulators that allows it to sell shares or bonds quickly when it’s a good time to raise money. It’s like having a pre-approved plan ready so the company can act fast without going through lengthy paperwork each time they want to sell, making fundraising more flexible.

base prospectus financial

"Form S-3 ... and the related base prospectus with the SEC"

A base prospectus is a detailed document that provides essential information about a financial offering, such as a bond or share issue. It acts like a comprehensive guide for investors, explaining what the investment involves, the risks involved, and how the process works. This helps investors make informed decisions before committing their money.

prospectus supplement financial

"filed a prospectus supplement to the Registration Statement"

A prospectus supplement is an additional document provided alongside a company's main offering details, offering updated or extra information about a specific financial product being sold. It helps investors understand the latest terms, risks, and details of the investment, similar to how an update or revision clarifies or expands on original instructions, ensuring they have current and complete information before making a decision.

Offering Details

ATM · Up to $50 million of shares of Common Stock (new August prospectus supplement); previously up to $24,492,819 under June Prospectus

Offering

Offering Type ATM

Securities Offered Common stock, par value $0.001 per share

Offering Amount Up to $50 million of shares of Common Stock (new August prospectus supplement); previously up to $24,492,819 under June Prospectus

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What change does Astrotech Corp (ASTC) announce in this 424B5 supplement?

Astrotech terminates its prior at-the-market offering under the June Prospectus effective August 19, 2026. The Offering Agreement continues, but any future common stock sales will occur under a new August 19, 2026 prospectus supplement to the company’s S-3 shelf.

How much stock had Astrotech (ASTC) registered and sold under the June Prospectus ATM program?

Astrotech had registered up to $24,492,819 of common stock under the June Prospectus. Between June 3, 2026 and this supplement, it sold 258,856 shares for gross proceeds of approximately $7.9 million through the at-the-market program.

What is the size of Astrotech’s new ATM capacity under the August 2026 prospectus supplement?

The August 19, 2026 prospectus supplement covers the offer and sale of up to $50 million of common stock. These shares may be sold from time to time under the existing Offering Agreement with H.C. Wainwright & Co. as sales agent.

Is the at-the-market Offering Agreement with H.C. Wainwright still active for ASTC?

Yes. The filing states the Offering Agreement with H.C. Wainwright & Co. remains in full force and effect. Only the June Prospectus is terminated; future sales under the agreement will rely on the August 19, 2026 prospectus supplement.

What was the recent market price of Astrotech (ASTC) common stock mentioned here?

On August 19, 2026, the last reported sale price of Astrotech’s common stock on the Nasdaq Capital Market was $7.94 per share. This gives context for the company’s at-the-market offering activity and potential future share issuances.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 08/19/2026 - 05:25 PM EDT Learn about SEC filing dates

Filed pursuant to Rule 424(b)(5)

Registration Statement No. 333-293023

PROSPECTUS SUPPLEMENT

(To prospectus dated January 30, 2026)

This prospectus supplement supplements and amends certain information contained in the prospectus supplement, dated June 3, 2026 to the prospectus dated January 30, 2026 (collectively, the “June Prospectus”), relating to the offer and sale of our common stock, par value $0.001 per share (“common stock”), through H.C. Wainwright & Co., LLC (“Wainwright”), as sales agent, in “at the market offerings” as defined in Rule 415 promulgated under the Securities Act of 1933, as amended, pursuant to an at-the-market offering agreement (the “Offering Agreement”) with Wainwright, dated June 2, 2026.

Our common stock is listed on the Nasdaq Capital Market under the symbol “ASTC.” On August 19, 2026, the last reported sale price of our common stock on the Nasdaq Capital Market was $7.94 per share.

Under the June Prospectus, we initially registered up to $24,492,819 of our common stock for offer and sale pursuant to the Offering Agreement. From June 3, 2026 through the date of this prospectus supplement, we have sold 258,856 shares of our common stock under the Offering Agreement for gross proceeds of approximately $7.9 million.

On June 30, 2026, the Company filed a shelf registration statement on Form S-3 (File No. 333-297144) (the “Registration Statement”) and the related base prospectus with the SEC, which was declared effective on July 7, 2026. On August 19, 2026, the Company filed a prospectus supplement to the Registration Statement (the “August Prospectus Supplement”) with the SEC in connection with the offer and sale of up to $50 million of shares of Common Stock pursuant to the Offering Agreement, which replaces and supersedes the Prior Prospectus Supplement.

The purpose of this prospectus supplement is to terminate the continuous offering by us under the June Prospectus effective August 19, 2026. No further shares will be offered or sold under the June Prospectus. The Offering Agreement remains in full force and effect, and any further shares of common stock offered or sold pursuant to the Offering Agreement will be made pursuant to the August Prospectus Supplement.

The date of this prospectus supplement is August 19, 2026.