Theurer Nathan B. 4

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.