Update on Voting (with DEGIRO) in Europe

By: Andy Marsh, CEO and Chairman

Another of many voting posts, but sharing this as I just went through it in case it’s handy.

Voting via DEGIRO is no longer possible as they require weeks of notice prior to the Special Meeting. However, as other investors mentioned on Reddit, DEGIRO can issue a stamped Certificate of Ultimate Beneficial Ownership (UBO) certificate dated 12 December (at 5 EUR cost). You can then vote through Sodali if you sign their proxy card and provide them with the certificate.

Note that DEGIRO did not proactively offer this solution. They had just said that voting was no longer possible.

So, in short:

1. Email DEGIRO at ca@degiro.nl / clients@degiro.com requesting a UBO certificate of your Plug Power shares dated 12 December 2025, and confirming that you agree to the 5 EUR fee. They will make the UBO certificate available in your DEGIRO account’s inbox, and credit the fee from your balance.

2. Email Sodali at plug@investor.sodali.com requesting the proxy card for Plug’s Special Meeting scheduled for 17 February, and mention that you cannot vote through DEGIRO in Europe.

3. Fill out and sign the proxy card. Then return it to Sodali together with the UBO certificate you received from DEGIRO.

Important Additional Information and Where to Find It
The Company has filed a definitive proxy statement and other relevant documents with the U.S. Securities and Exchange Commission (“SEC”) in connection with the Special Meeting. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE DEFINITIVE PROXY STATEMENT AND OTHER RELEVANT DOCUMENTS FILED WITH THE SEC CAREFULLY AND IN THEIR ENTIRETY because they contain important information about the matters to be voted on at the Special Meeting. Stockholders may obtain copies of these documents free of charge at the SEC’s website at www.sec.gov or on the Company’s website at www.plugpower.com.

Participants in the Solicitation
The Company and its directors and executive officers may be deemed to be participants in the solicitation of proxies from the Company’s stockholders in connection with the Special Meeting. Information about the Company’s directors and executive officers is outlined in the definitive proxy statement for the 2025 Annual Meeting of Stockholders, which was filed with the SEC on June 9, 2025, and information about their ownership of the Company’s stock is outlined in the definitive proxy statement for the Special Meeting filed with the SEC on December 12, 2025.

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