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 Exhibit 99.4​
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13.14.15.For Against Abstain16.1.2.3.For Against Abstain4.5.6.7.8.9.For Against Abstain10.11.12.Ferroglobe PLCA Proposals — The Board recommends a vote FOR Proposals 1 – 16Please sign exactly as name(s) appears hereon. Joint owners should each sign. When signing as attorney, executor, administrator, corporate officer, trustee, guardian, or custodian, please givefull title.Date (mm/dd/yyyy) — Please print date below. Signature 1 — Please keep signature within the box. Signature 2 — Please keep signature within the box.B Authorized Signatures — This section must be completed for your vote to be counted. — Date and Sign BelowAnnual Meeting Proxy CardUsing a black ink pen, mark your votes with an X as shown in this example. Please do not write outside the designated areas.TIF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE.TYou may vote online or by phone instead of mailing this cardOnlineGo to www.envisionreports.com/GSM or scan the QR code — login details are located in the shaded bar below.Your vote matters – here’s how to vote!Votes submitted electronically must be received by 00:01, British Summer Time, on June 16, 2026.Save paper, time and money! Sign up for electronic delivery at www.envisionreports.com/GSMPhoneCall toll free 1-800-652-VOTE (8683) within the USA, US territories and Canada1 U P X
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Proxy Solicited by Board of Directors for Annual Meeting – June 17, 2026The undersigned hereby appoints the Company’s Executive Chairman or Company Secretary, each individually and each with powers of substitution, asproxies for the undersigned to vote all of the Ordinary Shares the undersigned may be entitled to vote at the Annual General Meeting of Shareholders ofFerroglobe PLC called to be held at 14:00 (British Summer Time) on Wednesday, June 17, 2026 at 13 Chesterfield Street, London, W1J 5JN, UK, or anyadjournment or postponement thereof in the manner indicated on the reverse side of this proxy, and upon such other business as may lawfully come beforethe meeting or any adjournment or postponement thereof. The undersigned acknowledges receipt of the Notice of Annual General Meeting of Ferroglobe PLC.The undersigned revokes any proxy or proxies previously given for such shares. The undersigned ratifies and confirms any actions that the persons holdingthe undersigned’s proxy, or their substitutes, by virtue of this executed card take in accordance with the proxy granted hereunder. IF NO DIRECTION AS TOTHE MANNER OF VOTING THE PROXY IS MADE, THE PROXY WILL BE VOTED “FOR” THE RESOLUTIONS IN PROPOSALS 1 THROUGH 16 AS INDICATED ON THEREVERSE SIDE HEREOF.You are encouraged to specify your
choices by marking the appropriate boxes (SEE REVERSE SIDE) but you need not mark any boxes if you wish tovote in accordance with the Board of Directors’ recommendations. This proxy, when properly executed, will be voted in the manner directed herein.The Board of Directors recommends a vote “FOR” Proposals 1 – 16.(Items to be voted appear on reverse side.)Proxy — Ferroglobe PLCTIF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE.TC Non-Voting ItemsMeeting AttendanceMark box to the right if you plan to attend the Annual Meeting.Change of Address — Please print new address below. Comments — Please print your comments below.2026 Annual Meeting Admission Ticket2026 Annual Meeting of Ferroglobe PLC ShareholdersThe 2026 Annual Meeting of Shareholders of Ferroglobe PLC will be held on Wednesday, June 17, 2026 at 14:00 (British Summer Time) at 13 Chesterfield Street, London W1J 5JN, UKUpon arrival, please present this admission ticket and photo identification at the registration desk.U.K. Annual Report and Accounts 20251. THAT the directors’ and auditor’s reports and the accounts of the Company for the financial year ended December 31, 2025 (the “U.K. Annual Report and Accounts”) be received.Directors’ remuneration2. THAT the directors’ annual report on remuneration for the financial year ended December 31, 2025 (excluding, for the avoidance of doubt, any part of the Directors’ remuneration report containing the directors’ remuneration policy), as set out on pages 40 to 42 and 51 to 61 of the U.K. Annual Report and Accounts be approved.Authority for certain donations and expenditure3. THAT, in accordance with Part 14 of the Companies Act and in substitution for any previous authorities given to the Company (and its subsidiaries), the Company (and all companies that are subsidiary of the Company at any time during the period for which this resolution has effect) be authorized to: (i) make political donations to political parties or independent election candidates; (ii) make political donations to political organizations other than political parties, and (iii) incur political expenditure, in each case, as such terms are defined in the Companies Act, provided that with respect to each of the foregoing categories, any such donations or expenditure made by the Company, or a subsidiary of the Company, do not in the aggregate exceed £100,000. Such authority shall expire at the conclusion of the Company’s next annual general meeting. For the purposes of this resolution, the authorized sum may comprise sums in different currencies that shall be converted at such rate as the Board may in its absolute discretion determine to be appropriate. Directors’ re-election4. THAT Javier López Madrid be re-elected as a director.5. THAT Marco Levi be re-elected as a director.6. THAT Marta de Amusategui y Vergara be re-elected as a director.7. THAT Bruce L. Crockett be re-elected as a director.8. THAT Stuart E. Eizenstat be re-elected as a director.9. THAT Manuel Garrido y Ruano be re-elected as a director.10. THAT Juan Villar Mir de Fuentes be re-elected as a director.11. THAT Belen Villalonga Morenés be re-elected as a director.12. THAT Silvia Villar-Mir de Fuentes be re-elected as a director.13. THAT Nicolas De Santis be re-elected as a director.14. THAT Rafael Barrilero Yarnoz be re-elected as a director.Re-appointment of Auditor15. THAT KPMG LLP be re-appointed as auditor of the Company to hold office from theconclusion of the Annual General Meeting until the conclusion of the next generalmeeting at which accounts are laid before the Company.Remuneration of Auditor16. THAT the Audit Committee of the Board be authorized to determine theauditor’s remuneration.
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