Certara CFO John Gallagher's Equity Award Vesting and Tax Withholding Transactions

This Form 4 filing reports equity transactions for John E. Gallagher, Chief Financial Officer of Certara, Inc. On April 1, 2026, Gallagher received 23,346 shares from performance stock units (PSUs) that vested based on achievement of performance objectives from 2023-2025. Additionally, he received 12,633 shares from 2023 RSUs, 15,190 shares from 2024 RSUs, and 22,782 shares from 2025 RSUs that vested on the same date. The filing also reports tax withholding transactions where 7,775 shares were sold at $5.70 per share to cover tax obligations on the PSUs, 4,327 shares were withheld for 2023 RSUs, 5,203 shares for 2024 RSUs, and 7,803 shares for 2025 RSUs. Following these transactions, Gallagher's total direct ownership increased to 95,371 shares of Certara common stock.