Theurer Nathan B. 4

4 · FIRST SOLAR, INC. · Filed Mar 17, 2026

AI-generated summary of this filing

Updated Mar 17, 2026

First Solar (FSLR) VP Nathan Theurer Sells 131 Shares

What Happened

Nathan B. Theurer, VP — Global Controller & CAO at First Solar (FSLR), had 131 restricted stock units (RSUs) vest on March 13, 2026, which converted into 131 shares. Theurer sold those 131 shares in two open-market transactions: 35 shares on March 16 at $200.80 ($7,028) and 96 shares on March 17 at $199.53 ($19,155), for total proceeds of $26,183. The vesting/conversion is reported as a derivative conversion (code M).

Key Details

Vesting/conversion: 131 RSUs converted to 131 shares on 2026-03-13 (code M).
Open-market sales: 35 shares on 2026-03-16 at $200.80 ($7,028) and 96 shares on 2026-03-17 at $199.53 ($19,155).
Total shares sold: 131; total proceeds reported: $26,183.
Footnotes: RSUs were granted 3/15/2022 and vest 20% annually (F1, F4, F5). Issuer sold shares to satisfy tax withholding upon vesting (F2). The open-market sales were effected under a Rule 10b5-1 trading plan adopted by the reporting person on 5/15/2025 (F3).
Shares owned after the transactions: not specified in the provided filing.
Filing timeliness: Transactions were reported on Form 4 filed 2026-03-17 (timely within the SEC’s two-business-day rule for these dates).

Context

These were RSU vesting and subsequent sales, not an independent open-market purchase; the conversion (code M) reflects issuance upon vesting rather than an option exercise for cash. The sales were executed pursuant to a pre-established 10b5-1 plan, which is a common way for insiders to sell shares on a set schedule. This filing is factual reporting of the vesting and sales and does not, by itself, indicate the insider’s broader view of the company.

Form 4

Period: 2026-03-13

VP - Global Controller and CAO

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-03-13+131→ 131 total
Sale
Common Stock
[F2]
2026-03-16$200.80/sh−35$7,028→ 96 total
Sale
Common Stock
[F3]
2026-03-17$199.53/sh−96$19,155→ 0 total
Exercise/Conversion
Restricted Stock Units
[F4][F5]
2026-03-13−131→ 130 total
→ Common Stock (131 underlying)

Footnotes (5)

[F1]Represents shares of common stock issued upon vesting of 20% of the restricted stock units granted on March 15, 2022.
[F2]Represents shares of common stock sold by the Issuer to satisfy certain tax withholding obligations with the vesting of the restricted stock units.
[F3]This transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person on May 15, 2025.
[F4]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.
[F5]The restricted stock units were granted on March 15, 2022 as part of the Issuer's annual equity grant to certain associates. The restricted stock units granted on March 15, 2022 vest annually at a rate of 20% on each anniversary of the grant date, commencing on the first anniversary of the grant date.

Signature

/s/ Jason E. Dymbort, attorney-in-fact|2026-03-17

1 file