[Form 4] FIRST SOLAR, INC. Insider Trading Activity

Rhea-AI Filing Summary

First Solar, Inc. Chief Executive Officer Mark R. Widmar reported a mix of equity award vesting and related tax withholding activity. He acquired 17,664 shares of common stock on a grant or award basis on February 27, 2026, representing shares issued upon vesting of performance share units granted on March 6, 2023, after an approximately three-year performance period tied to performance objectives. On March 3, 2026, 7,738 shares of common stock were sold by the issuer to satisfy tax withholding obligations arising from that vesting, rather than as a discretionary open-market sale. Following these transactions, Widmar directly owned 91,787 shares of First Solar common stock.

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

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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^*

Widmar Mark R

(Last) (First) (Middle)

C/O FIRST SOLAR, INC.

4300 E CAMELBACK ROAD, SUITE 220

(Street)

PHOENIX AZ 85018

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
FIRST SOLAR, INC. [ FSLR ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

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

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

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

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
Common Stock	02/27/2026		A		17,664(1)	A	$0	99,525	D
Common Stock	03/03/2026		S		7,738(2)	D	$195.93	91,787	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

Explanation of Responses:

1. Represents the acquisition of shares of common stock issued upon the vesting of the performance share units granted on March 6, 2023, which performance share unit awards vested over an approximately three-year performance period contingent upon the achievement of certain performance objectives.

2. Represents shares of common stock sold by the Issuer to satisfy certain tax withholding obligations with the vesting of the performance share units.

	/s/ Jason E. Dymbort, attorney-in-fact	03/03/2026
	** 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.

FAQ

What insider transactions did First Solar (FSLR) CEO Mark Widmar report?

Mark Widmar reported a stock award vesting and a related tax sale. He acquired 17,664 First Solar common shares from vested performance share units, and 7,738 shares were sold by the issuer solely to cover tax withholding obligations tied to that vesting.

How many First Solar (FSLR) shares did the CEO acquire in the latest Form 4?

Mark Widmar acquired 17,664 First Solar common shares. These shares were issued upon vesting of performance share units granted on March 6, 2023, after about a three-year performance period tied to achieving specified performance objectives set by the company.

Why were 7,738 First Solar (FSLR) shares sold in Mark Widmar’s Form 4?

The 7,738 First Solar shares were sold by the issuer to satisfy tax withholding obligations. These obligations arose from the vesting of performance share units, meaning the sale functioned as a tax-related transaction rather than a discretionary open-market sale by the CEO.

What is Mark Widmar’s direct ownership in First Solar (FSLR) after these transactions?

After the reported transactions, Mark Widmar directly owned 91,787 shares of First Solar common stock. This figure reflects the net result of the 17,664-share award vesting and the 7,738 shares sold by the issuer to cover associated tax withholding requirements.

What were the terms of the performance share units that vested for First Solar (FSLR) CEO?

The vested performance share units were granted on March 6, 2023 and covered an approximately three-year performance period. Vesting depended on meeting specified performance objectives, after which 17,664 shares of First Solar common stock were issued to CEO Mark Widmar.