Jonathan Jay Mazelsky - 12 Feb 2026 Form 4 Insider Report for IDEXX LABORATORIES INC /DE (IDXX)

Role
President and CEO, Director
Signature
/s/ Lily J. Lu, Attorney-in-Fact for Jonathan Jay Mazelsky
Issuer symbol
IDXX
Transactions as of
12 Feb 2026
Net transactions value
-$575,855
Form type
4
Filing time
17 Feb 2026, 19:30:58 UTC
Previous filing
13 Jan 2026
Next filing
02 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
MAZELSKY JONATHAN JAY President and CEO, Director ONE IDEXX DRIVE, WESTBROOK /s/ Lily J. Lu, Attorney-in-Fact for Jonathan Jay Mazelsky 17 Feb 2026 0001556270

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction IDXX Common Stock Options Exercise $0 +958 +1.2% $0.000000 83,422 14 Feb 2026 Direct F1
transaction IDXX Common Stock Options Exercise $0 +1,099 +1.3% $0.000000 84,521 14 Feb 2026 Direct
transaction IDXX Common Stock Tax liability $575,855 -915 -1.1% $629.35 83,606 14 Feb 2026 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction IDXX Restricted Stock Unit Award $0 +13,407 $0.000000 13,407 12 Feb 2026 Common Stock 13,407 Direct F3
transaction IDXX Restricted Stock Unit Options Exercise $0 -958 -100% $0.000000 0 14 Feb 2026 Common Stock 958 Direct F4
transaction IDXX Restricted Stock Unit Options Exercise $0 -1,099 -50% $0.000000 1,099 14 Feb 2026 Common Stock 1,099 Direct F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Includes a total of 21 shares purchased under the Issuer's Employee Stock Purchase Plan ('ESPP') on September 30, 2025 and December 31, 2025. There are a total of 1,943.302 shares held in the ESPP which has been increased by 0.004 shares due to a rounding calculation of previously issued fractional shares.
F2 Closing price of Issuer common stock on Nasdaq Global Select Market on February 13, 2026.
F3 Grant of restricted stock units ('RSU') that upon vesting, will be deferred and recorded in an account under the Issuer's Deferred Compensation Plan. This RSU grant vests in three annual installments, beginning February 14, 2027.
F4 Each RSU represents a contingent right to receive one share of Issuer common stock that vested in four annual installments, beginning February 14, 2023.
F5 Each RSU represents a contingent right to receive one share of Issuer common stock and vests in four annual installments, beginning February 14, 2024.