MAZELSKY JONATHAN JAY 4
4 · IDEXX LABORATORIES INC /DE · Filed Mar 2, 2026
Research Summary
AI-generated summary of this filing
IDEXX (IDXX) CEO Jonathan Mazelsky Exercises Options and Sells $15.3M Stock
What Happened
Jonathan J. Mazelsky, President & CEO and a director of IDEXX Laboratories (IDXX), exercised stock options and sold shares in late February 2026. On Feb 26 he exercised 23,326 option-derived shares at $141.60 per share (cash paid ~$3.30M) and on Feb 27 he exercised 197 shares at $505.53 (cash paid ~$99.6K) — total exercised = 23,523 shares. On Feb 26 he sold 23,326 shares in a series of open-market trades at prices roughly $650.00–$663.04 per share, producing aggregate proceeds of about $15.34M. The exercised shares match the number sold, indicating the exercised shares were immediately sold.
Key Details
- Transaction dates: Feb 26, 2026 (primary exercise + all open-market sales) and Feb 27, 2026 (exercise of 197 shares).
- Exercise (code M): 23,326 @ $141.60 (cost ~$3,302,962) and 197 @ $505.53 (cost ~$99,589).
- Open-market sales (code S): 23,326 shares across multiple trades on Feb 26 for total proceeds ≈ $15,338,082 (prices ranged ~ $650.00–$663.04; detailed weighted averages shown in footnotes F1–F13).
- Footnotes F14/F15: options were from grants that vested over time (one grant vested in installments beginning Feb 14, 2018; another vested on Feb 14, 2026).
- The Form 4 was filed Mar 2, 2026 (within required reporting window — filing appears timely).
- Shares owned after the transactions are not specified in the provided excerpt of the filing.
- Transaction codes: M = option exercise/conversion; S = open-market sale. The $0.00 “Disposed” entries reflect disposition of derivative securities upon exercise.
Context
This is a routine insider option exercise with simultaneous sales (commonly used to cover exercise costs, tax withholding, or to monetize vested awards). The filing is factual: it shows option vesting and near-immediate sale of the exercised shares rather than an independent open‑market purchase by the insider.
Insider Transaction Report
Form 4
MAZELSKY JONATHAN JAY
DirectorPresident and CEO
Transactions
- Exercise/Conversion
Common Stock
2026-02-26$141.60/sh+23,326$3,302,962→ 106,932.302 total - Sale
Common Stock
[F1]2026-02-26$650.67/sh−1,281$833,508→ 105,651.302 total - Sale
Common Stock
[F2]2026-02-26$651.49/sh−1,095$713,378→ 104,556.302 total - Sale
Common Stock
[F3]2026-02-26$652.49/sh−1,669$1,089,013→ 102,887.302 total - Sale
Common Stock
[F4]2026-02-26$653.68/sh−1,171$765,455→ 101,716.302 total - Sale
Common Stock
[F5]2026-02-26$654.63/sh−1,111$727,293→ 100,605.302 total - Sale
Common Stock
[F6]2026-02-26$655.85/sh−1,488$975,905→ 99,117.302 total - Sale
Common Stock
[F7]2026-02-26$656.85/sh−1,343$882,143→ 97,774.302 total - Sale
Common Stock
[F8]2026-02-26$657.84/sh−2,860$1,881,433→ 94,914.302 total - Sale
Common Stock
[F9]2026-02-26$658.92/sh−3,660$2,411,635→ 91,254.302 total - Sale
Common Stock
[F10]2026-02-26$659.75/sh−2,859$1,886,224→ 88,395.302 total - Sale
Common Stock
[F11]2026-02-26$661.10/sh−1,200$793,317→ 87,195.302 total - Sale
Common Stock
[F12]2026-02-26$662.16/sh−1,000$662,157→ 86,195.302 total - Sale
Common Stock
[F13]2026-02-26$663.04/sh−2,589$1,716,621→ 83,606.302 total - Exercise/Conversion
Common Stock
2026-02-27$505.53/sh+197$99,589→ 83,803.302 total - Exercise/Conversion
Non-Qualified Stock Option (right-to-buy)
[F14]2026-02-26−23,326→ 0 totalExercise: $141.60Exp: 2027-02-13→ Common Stock (23,326 underlying) - Exercise/Conversion
Incentive Stock Option (right-to-buy)
[F15]2026-02-27−197→ 0 totalExercise: $505.53Exp: 2032-02-13→ Common Stock (197 underlying)
Footnotes (15)
- [F1]Represents the weighted average price of the shares sold ranging from a low of $650.00 to a high of $650.96 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F10]Represents the weighted average price of the shares sold ranging from a low of $659.31 to a high of $660.275 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F11]Represents the weighted average price of the shares sold ranging from a low of $660.59 to a high of $661.55 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F12]Represents the weighted average price of the shares sold ranging from a low of $661.65 to a high of $662.55 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F13]Represents the weighted average price of the shares sold ranging from a low of $662.72 to a high of $663.505 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F14]Grant of option to buy shares of Issuer common stock that vested in five annual installments beginning February 14, 2018.
- [F15]Grant of option to buy shares of Issuer common stock that vested on February 14, 2026.
- [F2]Represents the weighted average price of the shares sold ranging from a low of $651.06 to a high of $651.85 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F3]Represents the weighted average price of the shares sold ranging from a low of $652.105 to a high of $653.06 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F4]Represents the weighted average price of the shares sold ranging from a low of $653.19 to a high of $654.155 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F5]Represents the weighted average price of the shares sold ranging from a low of $654.24 to a high of $655.2175 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F6]Represents the weighted average price of the shares sold ranging from a low of $655.275 to a high of $656.205 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F7]Represents the weighted average price of the shares sold ranging from a low of $656.28 to a high of $657.27 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F8]Represents the weighted average price of the shares sold ranging from a low of $657.305 to a high of $658.275 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
- [F9]Represents the weighted average price of the shares sold ranging from a low of $658.30 to a high of $659.24 per share. The undersigned undertakes, upon request by the Commission staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares purchased at each separate price.
Signature
/s/ Lily J. Lu, Attorney-in-Fact for Jonathan Jay Mazelsky|2026-03-02