FASTENAL CO (FAST) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-05 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: FASTENAL CO (FAST) CIK: 0000815556 --- Reporting Owner --- Name: Heise Rita J. CIK: 0001554387 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-05 | Code: M (Exercise of derivative) Shares: +10,000 | Price: $13.00 Total Value: $130,000.00 Shares Owned After: 30,000 | Ownership: D (Direct) Footnotes: [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. [Transaction #2] Security: Common Stock Date: 2026-08-05 | Code: S (Open market sale) Shares: -10,000 | Price: $50.05 Total Value: $500,544.00 Shares Owned After: 20,000 | Ownership: D (Direct) Footnotes: [F2] Shares maintained in a revocable trust for which reporting person and her spouse serve as Trustees and share voting and investment power. [Transaction #3] Security: Common Stock Date: 2026-08-05 | Code: M (Exercise of derivative) Shares: +24,964 | Price: $19.00 Total Value: $474,316.00 Shares Owned After: 44,964 | Ownership: D (Direct) Footnotes: [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. [Transaction #4] Security: Common Stock Date: 2026-08-05 | Code: S (Open market sale) Shares: -24,964 | Price: $50.05 Total Value: $1,249,558.04 Shares Owned After: 20,000 | Ownership: D (Direct) Footnotes: [F2] Shares maintained in a revocable trust for which reporting person and her spouse serve as Trustees and share voting and investment power. --- Derivative Transactions --- [Transaction #1] Security: Stock Option (Right to Buy) Date: 2026-08-05 | Code: M (Exercise of derivative) Shares: -10,000 | Price: $0.00 Exercisable: N/A | Expires: 2028-12-31 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. [F3] The option was granted on 1/2/2019 to the reporting person pursuant the Fastenal Company Non-employee Director Stock Option Plan in lieu of an annual retainer and was immediately vested and exercisable. [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. [Transaction #2] Security: Stock Option (Right to Buy) Date: 2026-08-05 | Code: M (Exercise of derivative) Shares: -24,964 | Price: $0.00 Exercisable: N/A | Expires: 2029-12-31 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. [F4] The option was granted on 1/2/2020 to the reporting person pursuant the Fastenal Company Non-employee Director Stock Option Plan in lieu of an annual retainer and was immediately vested and exercisable. [F1] On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. --- Footnotes (Complete Index) --- F1: On May 21, 2025, the Common Stock of Fastenal Company spit 2-for-1 and the amounts reported have been adjusted to reflect the stock split. F2: Shares maintained in a revocable trust for which reporting person and her spouse serve as Trustees and share voting and investment power. F3: The option was granted on 1/2/2019 to the reporting person pursuant the Fastenal Company Non-employee Director Stock Option Plan in lieu of an annual retainer and was immediately vested and exercisable. F4: The option was granted on 1/2/2020 to the reporting person pursuant the Fastenal Company Non-employee Director Stock Option Plan in lieu of an annual retainer and was immediately vested and exercisable. --- Signature --- /s/ /s/ John J. Milek, Attorney-in-Fact (2026-08-06)