Key facts
- This page summarizes Jonathan Jay Mazelsky's Form 4 filing for IDEXX LABORATORIES INC /DE (IDXX).
- 15 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 05 Nov 2026, 17:01.
Jonathan Jay Mazelsky - 04 Nov 2026 Form 4 Insider Report for IDEXX LABORATORIES INC /DE (IDXX)
- Reporting relationship
- Executive Chair of the Board, Director
- Issuer ticker
- IDXX
- Reported as of
- 04 Nov 2026
- Net transaction value
- -$17,678,195
- SEC form
- 4
- Accepted by SEC
- 05 Nov 2026, 17:01:55 UTC
- Prior SEC filing
- 02 Oct 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.
4 source fields
Reporting owner
1 detail
Filing notes and source
Key filing fact
Jonathan Jay Mazelsky filed Form 4 for IDEXX LABORATORIES INC /DE (IDXX) on 05 Nov 2026.
Change
- Previous filing in this sequence was filed on 02 Oct 2026.
- Current net transaction value: -$17,678,195.
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
- Executive Chair of the Board, Director
- Address
- ONE IDEXX DRIVE, WESTBROOK
- Signature
- /s/ Lily J. Lu, Attorney-in-Fact for Jonathan Jay Mazelsky
- Signature date
- 05 Nov 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
IDXX
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +25,140
- Change %
- +30%
- Price
- $178.26*
- Shares after
- 108,943
- Date
- 04 Nov 2026
- Ownership
- Direct
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$1,358,121
- Shares
- -1,945
- Change %
- -1.8%
- Price
- $698.26
- Shares after
- 106,998
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F1
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$2,849,761
- Shares
- -4,075
- Change %
- -3.8%
- Price
- $699.33
- Shares after
- 102,923
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F2
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$1,167,442
- Shares
- -1,667
- Change %
- -1.6%
- Price
- $700.32
- Shares after
- 101,256
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F3
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$3,184,158
- Shares
- -4,540
- Change %
- -4.5%
- Price
- $701.36
- Shares after
- 96,716
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F4
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$1,499,922
- Shares
- -2,136
- Change %
- -2.2%
- Price
- $702.21
- Shares after
- 94,580
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F5
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$2,778,624
- Shares
- -3,950
- Change %
- -4.2%
- Price
- $703.45
- Shares after
- 90,630
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F6
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$169,342
- Shares
- -240
- Change %
- -0.26%
- Price
- $705.59
- Shares after
- 90,390
- Date
- 04 Nov 2026
- Ownership
- Direct
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$593,880
- Shares
- -840
- Change %
- -0.93%
- Price
- $707.00
- Shares after
- 89,550
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F7
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$1,302,434
- Shares
- -1,840
- Change %
- -2.1%
- Price
- $707.84
- Shares after
- 87,710
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F8
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$921,702
- Shares
- -1,300
- Change %
- -1.5%
- Price
- $709.00
- Shares after
- 86,410
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F9
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$1,065,891
- Shares
- -1,501
- Change %
- -1.7%
- Price
- $710.12
- Shares after
- 84,909
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F10
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$551,264
- Shares
- -775
- Change %
- -0.91%
- Price
- $711.31
- Shares after
- 84,134
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F11
IDXX
transaction
Common Stock
Sale
- Transaction value
- -$235,655
- Shares
- -331
- Change %
- -0.39%
- Price
- $711.95
- Shares after
- 83,803
- Date
- 04 Nov 2026
- Ownership
- Direct
- Footnotes
- F12
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
- Shares
- -25,140
- Change %
- -100%
- Price
- Shares after
- 0
- Date
- 04 Nov 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 25,140
- Exercise price
- $178.26
- Footnotes
- F13, F14
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 14 footnotes
Footnote F1
Represents the weighted average price of the shares sold ranging from a low of $697.80 to a high of $698.77 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 $698.92 to a high of $699.89 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 $700.00 to a high of $700.80 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 $701.005 to a high of $701.96 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 F5
Represents the weighted average price of the shares sold ranging from a low of $702.00 to a high of $702.81 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 $703.04 to a high of $703.99 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 $706.60 to a high of $707.16 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 $707.645 to a high of $708.59 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 $708.65 to a high of $709.46 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 $709.815 to a high of $710.63 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 $710.82 to a high of $711.73 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 $711.845 to a high of $712.34 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
Grant of option to buy shares of Issuer common stock that vested in five annual installments beginning February 14, 2019.
Footnote F14
Not applicable.