Jonathan Jay Mazelsky

President and CEO · IDEXX Laboratories

Jonathan Jay Mazelsky (President and CEO) filed 3 Form 4 reports in the trailing twelve months (1 purchase, 2 sales, 1 filed past the two-business-day deadline), most often in IDEXX Laboratories, Inc. (IDXX). The largest single filing was $17.7M of IDXX (25,140 sh across 13 lots, as filed), executed Nov 4. Data as of Nov 8 2026.

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Return, ttmiAverage return per filing, trailing twelve months

–

purchases not yet measured

Delay-adjustediThe same average, entered at disclosure dates

–

returns measure stock purchases only

Filings, ttm

1 buys · 2 sells · 1 late

Median delay

–

measured on stock purchases

Volume, ttmiDollar value disclosed in the trailing twelve months

$33.1M

shares × price, as filed

Last traded

Nov 4

Filed Nov 5

Median ADV $321.9M across their filed names

Open performance→

Volume by month

Buys $101K Sells $51.5M

Shares × price, as filed · by filing month · past 24 months

Sectors filed on

Healthcare 3 filings

Sector per market data · by filing · past 12 months

Most traded names

IDXX

IDEXX Laboratories, Inc. IDXX · 0 buys · 3 sells 3 filings XRAY

DENTSPLY SIRONA Inc. XRAY · 1 buy · 0 sells 1 filing

Recent filings

IDXXSALE IDEXX Laboratories, Inc. View filing → $17.7M
25,140 sh across 13 lots
Exec Nov 4
Filed Nov 5 · 5:01 PM ET XRAYPURCHASE DENTSPLY SIRONA Inc. View filing → $101K
10,000 sh × $10.14
Exec Jun 12
Filed Jun 18 · 6:23 PM ET † IDXXSALE IDEXX Laboratories, Inc. View filing → $15.3M
23,326 sh across 13 lots
Exec Feb 26
Filed Mar 2 · 5:30 PM ET IDXXSALE IDEXX Laboratories, Inc. View filing → $18.5M
29,260 sh across 10 lots
Exec Aug 6 2025
Filed Aug 8 2025 · 5:30 PM ET