Regeneron (REGN)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-18 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: REGENERON PHARMACEUTICALS, INC. (REGN) CIK: 0000872589 --- Reporting Owner --- Name: Fenimore Christopher R. CIK: 0001697422 Role: Officer (EVP Finance CFO) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-18 | Code: M (Exercise of derivative) Shares: +6,283 | Price: $381.92 Total Value: $2,399,603.36 Shares Owned After: 24,583 | Ownership: D (Direct) [Transaction #2] Security: Common Stock Date: 2026-08-18 | Code: F (Payment of exercise/tax) Shares: -4,599 | Price: $813.47 Total Value: $3,741,148.53 Shares Owned After: 19,984 | Ownership: D (Direct) --- Derivative Transactions --- [Transaction #1] Security: Non-Qualified Stock Option (right to buy) Date: 2026-08-18 | Code: M (Exercise of derivative) Shares: -6,283 | Price: $0.00 Exercisable: N/A | Expires: 2026-12-16 Shares Owned After: 6,000 | Ownership: D (Direct) Footnotes: [F2] The stock option award vested in four equal annual installments, commencing one year after the date of grant. --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) [Holding #2] Security: Common Stock Ownership: I (Indirect) Footnotes: [F1] These shares are held in a trust for the benefit of the reporting person's spouse. The reporting person and the reporting person's spouse are trustees of the trust. [Holding #3] Security: Common Stock Ownership: I (Indirect) [Holding #4] Security: Common Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: These shares are held in a trust for the benefit of the reporting person's spouse. The reporting person and the reporting person's spouse are trustees of the trust. F2: The stock option award vested in four equal annual installments, commencing one year after the date of grant. --- Signature --- /s/ /s/ Christopher R. Fenimore (2026-08-20)