Mazelsky Jonathan Jay

Director | President And CEO | President &CEO +2 more

2 companies

Insider Signal Score

Good

Trades Analyzed

12M Win Rate

71.4%

Avg 3M Return

-3.4%

Avg 12M Return

+15.8%

Mazelsky Jonathan Jay is a President And CEO at IDEXX LABORATORIES INC /DE with holdings across 2 companies. Recent SEC Form 4 filings include 0 buys and 64 sells.

Estimated insider holdings value: $46.6M based on current market prices.

Holdings by Company

IDXXAug 15, 2025

Current Shares82.4K

Value$46.26M

Net Activity-128,616

Bought: 0Sold: 128.6K

XRAYJan 9, 2026

Current Shares28.8K

Value$296.0K

Net Activity0

Bought: 0Sold: 0

Transaction History

Showing 10 filings

Date	Ticker	Role	Type	Shares	Price	Value	Chg%	3M	12M
Aug 6, 2025	IDXX Idexx Laboratories Inc /de	President And CEO	Sale+OE	29,260	$631.98	$18,491,642.25	-3.0%	+15.7%	-
Feb 7, 2024	IDXX Idexx Laboratories Inc /de	President And CEO	Sale+OE	12,000	$572.61	$6,871,319.17	-2.9%	-15.5%	-19.5%
Dec 4, 2023	IDXX Idexx Laboratories Inc /de	President And CEO	Sale+OE	7,128	$513.05	$3,657,049.04	-4.3%	+10.6%	-16.4%
Aug 31, 2023	IDXX Idexx Laboratories Inc /de	President And CEO	Sale+OE	13,424	$512.01	$6,873,266.54	-15.5%	-8.7%	-5.9%
Nov 14, 2022	IDXX Idexx Laboratories Inc /de	President &CEO	Sale+OE	10,500	$434.47	$4,561,911.86	-3.4%	+16.0%	+6.1%
Nov 7, 2022	IDXX Idexx Laboratories Inc /de	President &CEO	Sale+OE	13,230	$382.49	$5,060,319.02	-2.7%	+26.0%	+9.7%
Aug 16, 2021	IDXX Idexx Laboratories Inc /de	President &CEO	Sell	6,000	$675.21	$4,051,262.48	-1.7%	-8.4%	-43.4%
Feb 17, 2021	IDXX Idexx Laboratories Inc /de	President &CEO	Sale+OE	13,868	$537.21	$7,449,968.99	-3.4%	-	-
Nov 5, 2020	IDXX Idexx Laboratories Inc /de	President &CEO	Sale+OE	5,206	$469.31	$2,443,253.77	-0.8%	-	-
Feb 5, 2020	IDXX Idexx Laboratories Inc /de	President &CEO	Sale+OE	8,000	$277.84	$2,222,692.11	-2.9%	-	-

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Insider	Role	Shares	Value	Buys	Sells

Date	Ticker	Insider	Role	Type	Shares	Price	Value	Chg%	SEC