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

Rhea-AI Filing Summary

FIRST SOLAR, INC. Chief Supply Chain Officer Michael Koralewski reported routine equity compensation activity and related share disposals. On March 6, 2026, a total of 1,854 restricted stock units were exercised into the same number of common shares, reflecting scheduled vesting from grants made in 2021, 2023, 2024, and 2025 under the company’s 2020 Omnibus Incentive Compensation Plan. On the same date, he received a new annual equity grant of 1,903 restricted stock units, each representing the right to receive one share of common stock upon future vesting. On March 9, 2026, 756 common shares were sold at $190.36 per share, with a footnote stating these shares were sold by the issuer to satisfy tax withholding obligations arising from the RSU vesting. After these transactions, Koralewski directly holds 13,963 shares of 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^*

Koralewski Michael

(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 Supply Chain 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		651(1)	A	$0	13,516	D
Common Stock	03/06/2026		M		189(2)	A	$0	13,705	D
Common Stock	03/06/2026		M		442(3)	A	$0	14,147	D
Common Stock	03/06/2026		M		572(4)	A	$0	14,719	D
Common Stock	03/09/2026		S		265(5)	D	$190.36	14,454	D
Common Stock	03/09/2026		S		78(5)	D	$190.36	14,376	D
Common Stock	03/09/2026		S		180(5)	D	$190.36	14,196	D
Common Stock	03/09/2026		S		233(5)	D	$190.36	13,963	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			651	(7)	(7)	Common Stock	651	$0	0	D
Restricted Stock Units	(6)	03/06/2026		M			189	(8)	(8)	Common Stock	189	$0	376	D
Restricted Stock Units	(6)	03/06/2026		M			442	(9)	(9)	Common Stock	442	$0	884	D
Restricted Stock Units	(6)	03/06/2026		M			572	(10)	(10)	Common Stock	572	$0	1,716	D
Restricted Stock Units	(6)	03/06/2026		A		1,903		(11)	(11)	Common Stock	1,903	$0	1,903	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
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did First Solar (FSLR) executive Michael Koralewski report in this Form 4?

He reported routine equity compensation events, including RSU vesting into common shares, a new RSU grant, and share sales to cover tax withholding obligations tied to the vesting of restricted stock units.

How many First Solar (FSLR) restricted stock units vested for Michael Koralewski?

A total of 1,854 restricted stock units vested on March 6, 2026. These units converted into 1,854 common shares, reflecting scheduled vesting from annual equity grants made in 2021, 2023, 2024, and 2025 to the executive.

Did Michael Koralewski receive a new equity award from First Solar (FSLR)?

Yes. On March 6, 2026, he received a new grant of 1,903 restricted stock units. Each RSU entitles him to receive one share of First Solar common stock upon vesting under the 2020 Omnibus Incentive Compensation Plan.

How many First Solar (FSLR) shares were sold to cover taxes for Koralewski?

A total of 756 common shares were sold on March 9, 2026 at $190.36 per share. A footnote explains these shares were sold by the issuer to satisfy tax withholding obligations from the recent vesting of restricted stock units.

What is Michael Koralewski’s First Solar (FSLR) shareholding after these transactions?

Following the reported vesting, new RSU grant, and tax-related share sales, Michael Koralewski directly holds 13,963 shares of First Solar common stock, according to the post-transaction ownership figures disclosed in the Form 4.

Are Koralewski’s First Solar (FSLR) transactions open-market trades or compensation-related?

The filing shows RSU vesting and a new RSU grant as compensation-related events. The 756-share sale is described in a footnote as shares sold by the issuer to satisfy tax withholding obligations tied to the RSU vesting, not a discretionary sale.