Idexx Laboratories (IDXX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-20 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: IDEXX LABORATORIES INC /DE (IDXX) CIK: 0000874716 --- Reporting Owner --- Name: Emerson Andrew CIK: 0002058587 Role: Officer (EVP, CFO and Treasurer) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-20 | Code: M (Exercise of derivative) Shares: +265 | Price: $178.26 Total Value: $47,238.90 Shares Owned After: 4,507.444 | Ownership: D (Direct) Footnotes: [F1] Includes a total of 20 shares purchased under the Issuer Employee Stock Purchase Plan on March 31, 2026 and June 30, 2026. [Transaction #2] Security: Common Stock Date: 2026-08-20 | Code: F (Payment of exercise/tax) Shares: -86 | Price: $0.00 Shares Owned After: 4,421.444 | Ownership: D (Direct) --- Derivative Transactions --- [Transaction #1] Security: Incentive Stock Option (right-to-buy) Date: 2026-08-20 | Code: M (Exercise of derivative) Shares: -265 Exercise Price: $178.26 Exercisable: N/A | Expires: 2028-02-13 Shares Owned After: 925 | Ownership: D (Direct) Footnotes: [F3] Not applicable [F2] Grant of option to buy 1,190 shares of Issuer common stock that became exercisable in one installment on February 14, 2023. --- Footnotes (Complete Index) --- F1: Includes a total of 20 shares purchased under the Issuer Employee Stock Purchase Plan on March 31, 2026 and June 30, 2026. F2: Grant of option to buy 1,190 shares of Issuer common stock that became exercisable in one installment on February 14, 2023. F3: Not applicable --- Signature --- /s/ /s/ Lily J. Lu, Attorney-in-Fact for Andrew Emerson (2026-08-24)