Key facts
- This page summarizes Jonathan Jay Mazelsky's Form 4 filing for IDEXX LABORATORIES INC /DE (IDXX).
- 17 reported transactions and 2 derivative rows are listed below.
- Accepted by SEC: 02 Mar 2026, 17:00.
Jonathan Jay Mazelsky - 26 Feb 2026 Form 4 Insider Report for IDEXX LABORATORIES INC /DE (IDXX)
- Reporting relationship
- President and CEO, Director
- Issuer ticker
- IDXX
- Reported as of
- 26 Feb 2026
- Net transaction value
- -$11,935,530
- SEC form
- 4
- Accepted by SEC
- 02 Mar 2026, 17:00:21 UTC
- Prior SEC filing
- 17 Feb 2026
- Next SEC filing
- 02 Apr 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Lily J. Lu, Attorney-in-Fact for Jonathan Jay Mazelsky
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Jonathan Jay Mazelsky filed Form 4 for IDEXX LABORATORIES INC /DE (IDXX) on 02 Mar 2026.
Change
- Previous filing in this sequence was filed on 17 Feb 2026.
- Current net transaction value: -$11,935,530.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001556270
Primary reporting owner
MAZELSKY JONATHAN JAY
- Relationship
- President and CEO, Director
- Address
- ONE IDEXX DRIVE, WESTBROOK
- Signature
- /s/ Lily J. Lu, Attorney-in-Fact for Jonathan Jay Mazelsky
- Signature date
- 02 Mar 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
IDXX
transaction
Common Stock
Options Exercise
- Transaction value
- $3,302,962
- Shares
- +23,326
- Change %
- +28%
- Price
- $141.60
- Shares after
- 106,932
- Date
- 26 Feb 2026
- Ownership
- Direct
IDXX
transaction
Common Stock
Sale
- Transaction value
- $833,508
- Shares
- -1,281
- Change %
- -1.2%
- Price
- $650.67
- Shares after
- 105,651
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F1
IDXX
transaction
Common Stock
Sale
- Transaction value
- $713,378
- Shares
- -1,095
- Change %
- -1%
- Price
- $651.49
- Shares after
- 104,556
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F2
IDXX
transaction
Common Stock
Sale
- Transaction value
- $1,089,013
- Shares
- -1,669
- Change %
- -1.6%
- Price
- $652.49
- Shares after
- 102,887
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F3
IDXX
transaction
Common Stock
Sale
- Transaction value
- $765,455
- Shares
- -1,171
- Change %
- -1.1%
- Price
- $653.68
- Shares after
- 101,716
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F4
IDXX
transaction
Common Stock
Sale
- Transaction value
- $727,293
- Shares
- -1,111
- Change %
- -1.1%
- Price
- $654.63
- Shares after
- 100,605
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F5
IDXX
transaction
Common Stock
Sale
- Transaction value
- $975,905
- Shares
- -1,488
- Change %
- -1.5%
- Price
- $655.85
- Shares after
- 99,117
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F6
IDXX
transaction
Common Stock
Sale
- Transaction value
- $882,143
- Shares
- -1,343
- Change %
- -1.4%
- Price
- $656.85
- Shares after
- 97,774
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F7
IDXX
transaction
Common Stock
Sale
- Transaction value
- $1,881,433
- Shares
- -2,860
- Change %
- -2.9%
- Price
- $657.84
- Shares after
- 94,914
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F8
IDXX
transaction
Common Stock
Sale
- Transaction value
- $2,411,635
- Shares
- -3,660
- Change %
- -3.9%
- Price
- $658.92
- Shares after
- 91,254
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F9
IDXX
transaction
Common Stock
Sale
- Transaction value
- $1,886,224
- Shares
- -2,859
- Change %
- -3.1%
- Price
- $659.75
- Shares after
- 88,395
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F10
IDXX
transaction
Common Stock
Sale
- Transaction value
- $793,317
- Shares
- -1,200
- Change %
- -1.4%
- Price
- $661.10
- Shares after
- 87,195
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F11
IDXX
transaction
Common Stock
Sale
- Transaction value
- $662,157
- Shares
- -1,000
- Change %
- -1.1%
- Price
- $662.16
- Shares after
- 86,195
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F12
IDXX
transaction
Common Stock
Sale
- Transaction value
- $1,716,621
- Shares
- -2,589
- Change %
- -3%
- Price
- $663.04
- Shares after
- 83,606
- Date
- 26 Feb 2026
- Ownership
- Direct
- Footnotes
- F13
IDXX
transaction
Common Stock
Options Exercise
- Transaction value
- $99,589
- Shares
- +197
- Change %
- +0.24%
- Price
- $505.53
- Shares after
- 83,803
- Date
- 27 Feb 2026
- Ownership
- Direct
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
IDXX
transaction
Derivative
Non-Qualified Stock Option (right-to-buy)
Options Exercise
- Transaction value
- $0
- Shares
- -23,326
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 26 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 23,326
- Exercise price
- $141.60
- Footnotes
- F14
IDXX
transaction
Derivative
Incentive Stock Option (right-to-buy)
Options Exercise
- Transaction value
- $0
- Shares
- -197
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 27 Feb 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 197
- Exercise price
- $505.53
- Footnotes
- F15
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 15 footnotes
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote 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.
Footnote F14
Grant of option to buy shares of Issuer common stock that vested in five annual installments beginning February 14, 2018.
Footnote F15
Grant of option to buy shares of Issuer common stock that vested on February 14, 2026.