Idexx Laboratories (IDXX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-07 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: IDEXX LABORATORIES INC /DE (IDXX) CIK: 0000874716 --- Reporting Owner --- Name: SZOSTAK M ANNE CIK: 0001094176 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-07 | Code: M (Exercise of derivative) Shares: +257 | Price: $0.00 Shares Owned After: 519 | Ownership: D (Direct) --- Derivative Transactions --- [Transaction #1] Security: Restricted Stock Unit Date: 2026-05-07 | Code: M (Exercise of derivative) Shares: -257 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026. [F4] Not applicable. [F3] Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026. [F3] Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026. --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) Footnotes: [F1] The reporting person is the settlor of the Trust of M. Anne Szostak ("Trust") and the trustee of the Trust, has power to direct the distribution of Trust assets, and has the power to revoke or amend the Trust. The reporting person has a pecuniary interest in the shares held by the Trust. [Holding #2] Security: Common Stock Ownership: I (Indirect) Footnotes: [F2] The reporting person is a trustee of The O'Hanian-Szostak Family Foundation ('Foundation') and has power to direct the distribution of assets held by the Foundation. --- Footnotes (Complete Index) --- F1: The reporting person is the settlor of the Trust of M. Anne Szostak ("Trust") and the trustee of the Trust, has power to direct the distribution of Trust assets, and has the power to revoke or amend the Trust. The reporting person has a pecuniary interest in the shares held by the Trust. F2: The reporting person is a trustee of The O'Hanian-Szostak Family Foundation ('Foundation') and has power to direct the distribution of assets held by the Foundation. F3: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock that vested in one installment on May 7, 2026. F4: Not applicable. --- Signature --- /s/ /s/ Lily J. Lu, Attorney-in-Fact for M. Anne Szostak (2026-05-11)