First Solar (FSLR) CTO logs RSU vesting, new grant and 1,325-share tax sale

Rhea-AI Filing Summary

First Solar, Inc. Chief Technology Officer Markus Gloeckler reported routine equity compensation activity and related share sales. On March 6, 2026, he acquired a total of 3,150 shares of common stock at $0.00 per share through the vesting and conversion of restricted stock units granted in prior years, and received a new grant of 3,066 restricted stock units as part of the company’s annual executive equity program.

On March 9, 2026, 1,325 shares of common stock were sold at an average price of $190.36 per share in open-market transactions described as being made by the issuer to satisfy tax withholding obligations arising from the RSU vesting. Following these transactions, Gloeckler directly holds 9,862 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^*

Gloeckler Markus

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/06/2026

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	03/06/2026		M		760(1)	A	$0	8,797	D
Common Stock	03/06/2026		M		471(2)	A	$0	9,268	D
Common Stock	03/06/2026		M		852(3)	A	$0	10,120	D
Common Stock	03/06/2026		M		1,067(4)	A	$0	11,187	D
Common Stock	03/09/2026		S		320(5)	D	$190.36	10,867	D
Common Stock	03/09/2026		S		199(5)	D	$190.36	10,668	D
Common Stock	03/09/2026		S		358(5)	D	$190.36	10,310	D
Common Stock	03/09/2026		S		448(5)	D	$190.36	9,862	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
Restricted Stock Units	(6)	03/06/2026		M			760	(7)	(7)	Common Stock	760	$0	0	D
Restricted Stock Units	(6)	03/06/2026		M			471	(8)	(8)	Common Stock	471	$0	942	D
Restricted Stock Units	(6)	03/06/2026		M			852	(9)	(9)	Common Stock	852	$0	1,705	D
Restricted Stock Units	(6)	03/06/2026		M			1,067	(10)	(10)	Common Stock	1,067	$0	3,204	D
Restricted Stock Units	(6)	03/06/2026		A		3,066		(11)	(11)	Common Stock	3,066	$0	3,066	D

Explanation of Responses:

1. Represents shares of common stock issued upon vesting of 20% of the restricted stock units granted on March 6, 2021.

2. Represents shares of common stock issued upon vesting of 20% of the restricted stock units granted on March 6, 2023.

3. Represents shares of common stock issued upon vesting of 25% of the restricted stock units granted on March 6, 2024.

4. Represents shares of common stock issued upon vesting of 25% of the restricted stock units granted on March 6, 2025.

5. Represents shares of common stock sold by the Issuer to satisfy certain tax withholding obligations with the vesting of the restricted stock units.

6. Each restricted stock unit represents the right to receive, upon vesting, one share of the Issuer's common stock in accordance with the Issuer's 2020 Omnibus Incentive Compensation Plan.

7. The restricted stock units were granted on March 6, 2021 as part of the Issuer's annual equity grant to executive officers. The restricted stock units granted on March 6, 2021 vest annually at a rate of 20% on each anniversary of the grant date, commencing on the first anniversary of the grant date.

8. The restricted stock units were granted on March 6, 2023 as part of the Issuer's annual equity grant to executive officers. The restricted stock units granted on March 6, 2023 vest annually at a rate of 20% on each anniversary of the grant date, commencing on the first anniversary of the grant date.

9. The restricted stock units were granted on March 6, 2024 as part of the Issuer's annual equity grant to executive officers. The restricted stock units granted on March 6, 2024 vest annually at a rate of 25% on each anniversary of the grant date, commencing on the first anniversary of the grant date.

10. The restricted stock units were granted on March 6, 2025 as part of the Issuer's annual equity grant to executive officers. The restricted stock units granted on March 6, 2025 vest annually at a rate of 25% on each anniversary of the grant date, commencing on the first anniversary of the grant date.

11. The restricted stock units were granted on March 6, 2026 as part of the Issuer's annual equity grant to executive officers. The restricted stock units granted on March 6, 2026 vest annually at a rate of 25% on each anniversary of the grant date, commencing on the first anniversary of the grant date.

	/s/ Jason E. Dymbort, attorney-in-fact	03/10/2026
	** Signature of Reporting Person	Date
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FAQ

What insider transactions did First Solar (FSLR) report for CTO Markus Gloeckler?

First Solar reported that CTO Markus Gloeckler had restricted stock units vest into 3,150 common shares and received a new grant of 3,066 RSUs. Subsequently, 1,325 shares were sold at $190.36 per share to cover tax withholding obligations tied to the vesting.

How many First Solar (FSLR) shares does CTO Markus Gloeckler hold after these transactions?

After the reported Form 4 transactions, Markus Gloeckler directly holds 9,862 shares of First Solar common stock. This figure reflects the net result of RSU vesting into shares and the sale of 1,325 shares to satisfy tax withholding obligations on March 9, 2026.

Were the First Solar (FSLR) insider share sales discretionary or related to taxes?

The 1,325 First Solar shares reported as sold on March 9, 2026 were described in the footnotes as sold by the issuer to satisfy tax withholding obligations from RSU vesting, indicating a tax-related, mechanical disposition rather than a purely discretionary open-market sale by the CTO.

What restricted stock unit activity did First Solar (FSLR) disclose for its CTO?

First Solar disclosed that RSUs granted in 2021, 2023, 2024, and 2025 partially vested on March 6, 2026, converting into 3,150 common shares. The company also granted 3,066 new RSUs on March 6, 2026 under its 2020 Omnibus Incentive Compensation Plan for executive officers.

At what price were First Solar (FSLR) shares sold in the reported CTO transactions?

The 1,325 First Solar common shares associated with Markus Gloeckler’s Form 4 were sold at an average price of $190.36 per share. According to the footnotes, these sales were executed by the issuer to cover tax withholding obligations triggered by the vesting of restricted stock units.