Ferroglobe director corrects 25,974-share error

The director’s reported positions include shares through a corporation controlled by her spouse, through Panarea Capital SL, and 100 shares held directly.

Rhea-AI Filing Summary

Ferroglobe PLC (GSM) director Silvia Villar-Mir de Fuentes reported transactions held indirectly by her spouse on September 22, 2026: 28,117 performance share units were exercised or converted into 28,117 ordinary shares, and 6,889 ordinary shares were delivered or withheld for payment of exercise price or tax liability at $4.31 per share. Reported holdings included 147,200 shares through a corporation controlled by the spouse, correcting an arithmetic error reported March 25, 2026, that understated holdings by 25,974 shares; other listed holdings were 73,890 shares through Panarea Capital SL and 100 shares held directly.

Insider Trade Summary

28,117 shares exercised/converted

Exercise 6 txns

Insider Villar-Mir de Fuentes Silvia

Role Director

Type	Security	Shares	Price	Value
Exercise	PERFORMANCE SHARE UNIT	28,117	$0.00	$0.00
Exercise	ORDINARY SHARES	28,117	$0.00	$0.00
Exercise Price or Tax Liability	ORDINARY SHARES	6,889	$4.31	$30K
holding	ORDINARY SHARES F1	--	--	--
holding	ORDINARY SHARES	--	--	--
holding	ORDINARY SHARES	--	--	--

Holdings After Transaction: PERFORMANCE SHARE UNIT — 0 contracts (Indirect, By spouse); ORDINARY SHARES — 99,728 shares (Indirect, By spouse); ORDINARY SHARES — 147,200 shares (Indirect, By a corporation controlled by spouse); ORDINARY SHARES — 73,890 shares (Indirect, By Panarea Capital SL); ORDINARY SHARES — 100 shares (Direct)

Footnotes (1)

1. F1. The amount reported reflects the correction of an inadvertent arithmetic error in the holdings reported on the Form 4 filed March 25, 2026, which understated holdings by 25,974 shares.

Key Figures

Performance share units exercised or converted: 28,117 units Ordinary shares acquired upon exercise or conversion: 28,117 shares Shares delivered or withheld: 6,889 shares +4 more

7 metrics

Performance share units exercised or converted 28,117 units September 22, 2026

Ordinary shares acquired upon exercise or conversion 28,117 shares Indirectly held by spouse; September 22, 2026

Shares delivered or withheld 6,889 shares For payment of exercise price or tax liability; September 22, 2026

Reported price per share $4.31 per share Shares delivered or withheld on September 22, 2026

Ordinary shares held through spouse-controlled corporation 147,200 shares Reported amount corrects an arithmetic error in holdings reported March 25, 2026

Ordinary shares held through Panarea Capital SL 73,890 shares Reported holding

Direct ordinary share holdings 100 shares Reported holding

Key Terms

PERFORMANCE SHARE UNIT, derivative security, exercise price or tax liability

3 terms

PERFORMANCE SHARE UNIT financial

"PERFORMANCE SHARE UNIT"

A performance share unit (PSU) is a form of executive or employee pay that promises shares (or the cash value of shares) only if the company meets specific performance targets over a set period. Think of it like a bonus cheque that only arrives if the company hits agreed goals — it aligns managers’ rewards with business results and signals to investors how leadership is being incentivized to grow value over time.

derivative security financial

"Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

exercise price or tax liability financial

"Payment of exercise price or tax liability by delivering or withholding securities"

FAQ

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

What transactions did GSM director Silvia Villar-Mir de Fuentes report?

On September 22, 2026, her spouse exercised or converted 28,117 performance share units into 28,117 ordinary shares. Another 6,889 ordinary shares were delivered or withheld for payment of exercise price or tax liability at a reported $4.31 per share.

What GSM share holdings were reported after the September 22 transactions?

Reported positions included 147,200 ordinary shares held by a corporation controlled by the spouse and 73,890 shares held through Panarea Capital SL; the director held 100 shares directly. A footnote says the 147,200-share amount corrects an arithmetic error in holdings reported March 25, 2026, which understated holdings by 25,974 shares.

Were the GSM transactions reported under a Rule 10b5-1 plan?

No Rule 10b5-1 plan is reported.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 09/24/2026 - 04:02 PM Accepted by SEC EDGAR 09/24/2026 - 04:01 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Villar-Mir de Fuentes Silvia

(Last) (First) (Middle)

THE SCALPEL, 18TH FLOOR, 52 LIME STREET

(Street)

LONDON EC3M 7AF

(City) (State) (Zip)

UNITED KINGDOM

(Country)

2. Issuer Name and Ticker or Trading Symbol
Ferroglobe PLC [ GSM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/22/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
ORDINARY SHARES	09/22/2026		M		28,117	A	$0	106,617	I	By spouse
ORDINARY SHARES	09/22/2026		F		6,889	D	$4.31	99,728	I	By spouse
ORDINARY SHARES								147,200(1)	I	By a corporation controlled by spouse
ORDINARY SHARES								73,890	I	By Panarea Capital SL
ORDINARY SHARES								100	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
PERFORMANCE SHARE UNIT	$0	09/22/2026		M			28,117	11/24/2019	11/24/2026	ORDINARY SHARES	28,117	$0	0	I	By spouse

Explanation of Responses:

1. The amount reported reflects the correction of an inadvertent arithmetic error in the holdings reported on the Form 4 filed March 25, 2026, which understated holdings by 25,974 shares.

	/s/ Marta Bragado, attorney-in-fact for Silvia Villar-Mir de Fuentes	09/24/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)