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

First Solar (NASDAQ: FSLR) CTO trades 4,254 shares via 10b5-1 plan

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

First Solar, Inc. Chief Technology Officer Markus Gloeckler reported open-market or private sales of 4,254 shares of Common Stock. He sold 2,625.0000 shares at $218.0200 and 800.0000 shares at $222.0000 on August 3, 2026, and 829.0000 shares at $248.0000 on August 4, 2026. All transactions were executed under a previously adopted Rule 10b5-1 trading plan dated May 4, 2026.

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Insider Gloeckler Markus
Role Chief Technology Officer
Sold 4,254 shs ($955K)
Type Security Shares Price Value
Sale Common Stock F1 829 $248.00 $206K
Sale Common Stock F1 800 $222.00 $178K
Sale Common Stock F1 2,625 $218.02 $572K
Holdings After Transaction: Common Stock — 6,642 shares (Direct)
Footnotes (1)
  1. F1. This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person on May 4, 2026.
Total shares sold 4254 shares Aggregate Common Stock shares sold across three transactions
Sale on August 3, 2026 at $218.0200 2625.0000 shares at $218.0200 Non-derivative Common Stock sale by CTO Markus Gloeckler
Sale on August 3, 2026 at $222.0000 800.0000 shares at $222.0000 Non-derivative Common Stock sale by CTO Markus Gloeckler
Sale on August 4, 2026 at $248.0000 829.0000 shares at $248.0000 Non-derivative Common Stock sale by CTO Markus Gloeckler
Rule 10b5-1 trading plan regulatory
"This transaction was effected pursuant to a Rule 10b5-1 trading plan"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
Sale in open market or private transaction regulatory
"transaction_code_description: Sale in open market or private transaction"
Common Stock financial
"security_title: Common Stock"
Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.
Chief Technology Officer other
"officer_title: Chief Technology Officer"
The chief technology officer is the senior executive who sets a company's technology vision and oversees development, engineering, and technical operations—think of them as the lead architect and head mechanic who decides what tools the business builds and how they run. Their choices affect product direction, cost structure, cybersecurity and scalability, so investors watch the CTO to gauge a company’s ability to innovate, compete and manage technical risk.

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

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Form 4 Insider Transactions: What Each Field Means →

FAQ

What insider stock transactions did First Solar (FSLR) report for Markus Gloeckler?
First Solar reported that CTO Markus Gloeckler sold 4,254 shares of Common Stock in three transactions. The sales occurred on August 3 and 4, 2026, as open-market or private transactions executed under a previously adopted Rule 10b5-1 trading plan.

How many First Solar (FSLR) shares did CTO Markus Gloeckler sell, and at what prices?
Markus Gloeckler sold 4,254 First Solar shares. On August 3, 2026, he sold 2,625.0000 shares at $218.0200 and 800.0000 shares at $222.0000. On August 4, 2026, he sold 829.0000 shares at $248.0000 per share.

Were Markus Gloeckler’s First Solar (FSLR) share sales made under a Rule 10b5-1 plan?
Yes. All reported transactions were effected under a Rule 10b5-1 trading plan. A footnote states the plan was previously adopted by Markus Gloeckler on May 4, 2026, and each sale transaction is linked to that footnote.

What is Markus Gloeckler’s position at First Solar (FSLR) in this Form 4?
The reporting person, Markus Gloeckler, is identified as Chief Technology Officer of First Solar, Inc. The Form 4 shows he executed three non-derivative Common Stock sales reported as directly owned (ownership code D).

Does this First Solar (FSLR) Form 4 include any derivative security transactions?
No derivative transactions are listed. The filing reports three non-derivative Common Stock sale transactions, and the transaction summary shows a derivativeTransactionCount of 0, indicating only common share sales were reported in this Form 4.
SEC Form 4
FORM 4UNITED 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).
X
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 ARIZONA 85018
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
FIRST SOLAR, INC. [ FSLR ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Technology Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/03/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/03/2026(1)S800D$22210,096D
Common Stock08/03/2026(1)S2,625D$218.027,471D
Common Stock08/04/2026(1)S829D$2486,642D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person on May 4, 2026.
/s/ Jason E. Dymbort, attorney-in-fact08/05/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR