Plug Power (NASDAQ: PLUG) adds Yorkville to $1,000,000,000 ATM

Rhea-AI Filing Summary

Plug Power Inc. is updating its existing at-the-market offering program for its common stock having an aggregate offering price of up to $1,000,000,000. This supplement adds Yorkville Securities, LLC as an additional sales agent and/or principal alongside B. Riley Securities, Inc. under the existing Sales Agreement, allowing shares to be sold from time to time through either firm. The company’s common stock trades on the Nasdaq Capital Market under the symbol PLUG, and the last reported sale price was $2.27 per share on September 29, 2025.

 Filed Pursuant to Rule 424(b)(5)

 Registration No. 333-287577

PROSPECTUS SUPPLEMENT NO. 1
(To Prospectus Supplement dated August 15, 2025) 

(To Prospectus dated May 27, 2025) 

 

$1,000,000,000
Common Stock 

This supplement amends, supplements and updates the prospectus supplement, dated August 15, 2025 (collectively, the “prospectus supplement”), relating to the sale of our shares of common stock having an aggregate offering price of up to $1,000,000,000, from time to time through or to B. Riley Securities, Inc. (“B. Riley Securities”) as sales agent or principal pursuant to that certain At Market Issuance Sales Agreement, dated January 17, 2024, as amended by Amendment No. 1, dated February 23, 2024, Amendment No. 2, dated November 7, 2024, and Amendment No. 3, dated August 15, 2025 (collectively, the “Sales Agreement”).

On September 29, 2025, we entered into Amendment No. 4 to the Sales Agreement in order to add Yorkville Securities, LLC (“Yorkville Securities”) as an additional sales agent and/or principal through which we may offer and sell shares of our common stock pursuant to the Sales Agreement. All reference in the prospectus supplement to B. Riley Securities are hereby amended to include Yorkville Securities and all references to the sales agent are hereby amended to refer to each sales agent or the sales agents, as the context may require.

Our common stock is listed on the Nasdaq Capital Market under the symbol “PLUG.” On September 29, 2025, the last reported sale price of our common stock on the Nasdaq Capital Market was $2.27 per share.

Investing in our securities involves a high degree of risk. You should review carefully the risks and uncertainties referenced under the heading “Risk Factors” beginning on page S-6 of the prospectus supplement, dated August 15, 2025, and in the other documents that are incorporated by reference in the prospectus supplement and the accompanying prospectus. 

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this supplement, the prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense. 

B. Riley Securities  Yorkville Securities

The date of this supplement is September 30, 2025.

FAQ

What does Plug Power (PLUG) disclose in this prospectus supplement?

This prospectus supplement updates Plug Power’s existing at-the-market common stock offering of up to $1,000,000,000 and adds Yorkville Securities, LLC as an additional sales agent and/or principal.

What is the size of Plug Power’s at-the-market common stock offering?

The at-the-market offering covers shares of Plug Power’s common stock having an aggregate offering price of up to $1,000,000,000, to be sold from time to time.

Which firms act as sales agents for Plug Power’s at-the-market program?

The at-the-market program is conducted through or to B. Riley Securities, Inc. and Yorkville Securities, LLC, each of which may act as sales agent and/or principal under the Sales Agreement.

On which exchange is Plug Power’s common stock listed and what was the recent price?

Plug Power’s common stock is listed on the Nasdaq Capital Market under the symbol PLUG. The last reported sale price was $2.27 per share on September 29, 2025.

What agreement governs Plug Power’s at-the-market stock sales?

The sales are made pursuant to an At Market Issuance Sales Agreement dated January 17, 2024, as amended by several amendments, including Amendment No. 4 adding Yorkville Securities, LLC.

Where can investors find risk disclosures related to Plug Power’s stock offering?

Risk factors are referenced under the heading “Risk Factors” beginning on page S-6 of the August 15, 2025 prospectus supplement and in other documents incorporated by reference.