13F Pro

SEC Form 4 reporting owner

Mazelsky Jonathan Jay

Mazelsky Jonathan Jay has filed 26 Form 4 transactions reported between January 9, 2026 and July 1, 2026, as Director of INSULET CORP, Director of DENTSPLY SIRONA Inc. and President and CEO of IDEXX LABORATORIES INC /DE.

Name as filed: MAZELSKY JONATHAN JAY

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
$15.3M
13 lines
Companies
3
with Form 4 filings
Latest transaction
Jul 1, 2026
transaction date

Roles and reported holdings

  • PODDINSULET CORP
    Jul 1, 2026

    Director

    No common-stock holding reported on a purchase, sale, gift or withholding line.

  • XRAYDENTSPLY SIRONA Inc.
    Jan 9, 2026 – Jun 30, 2026

    Director

    No common-stock holding reported on a purchase, sale, gift or withholding line.

  • IDXXIDEXX LABORATORIES INC /DE
    Feb 12, 2026 – Feb 27, 2026

    President and CEO

    Held directly83,606 sh as of Feb 26, 2026 · Form 4

    24 months: $15.3M sold

Transaction history

All 26 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Jul 1, 2026PODDDirectorGrant or awardCode A · direct1,355—Form 4
Jun 30, 2026XRAYDirectorGrant or awardCode A · direct2,842$30K@ $10.56Form 4
Jun 12, 2026XRAYDirectorGrant or awardCode A · direct10,000$101K@ $10.14Form 4
Jun 3, 2026XRAYDirectorGrant or awardCode A · direct22,822—Form 4
Mar 31, 2026XRAYDirectorGrant or awardCode A · direct2,645$30K@ $11.34Form 4
Feb 27, 2026IDXXPresident and CEOOption exerciseCode M · direct197$100K@ $505.53Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct2,589$1.7M@ $663.04Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct1,000$662K@ $662.16Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct1,200$793K@ $661.10Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct2,859$1.9M@ $659.75Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct3,660$2.4M@ $658.92Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct2,860$1.9M@ $657.84Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct1,343$882K@ $656.85Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct1,488$976K@ $655.85Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct1,111$727K@ $654.63Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct1,171$765K@ $653.68Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct1,669$1.1M@ $652.49Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct1,095$713K@ $651.49Form 4
Feb 26, 2026IDXXPresident and CEOOpen-market saleCode S · direct1,281$834K@ $650.67Form 4
Feb 26, 2026IDXXPresident and CEOOption exerciseCode M · direct23,326$3.3M@ $141.60Form 4
Feb 14, 2026IDXXPresident and CEOShares withheld for tax or exercise priceCode F · direct915$576K@ $629.35Form 4
Feb 14, 2026IDXXPresident and CEOOption exerciseCode M · direct1,099—Form 4
Feb 14, 2026IDXXPresident and CEOOption exerciseCode M · direct958—Form 4
Feb 12, 2026IDXXPresident and CEOGrant or awardCode A · direct13,407—Form 4
Jan 9, 2026XRAYDirectorGrant or awardCode A · direct154$2K@ $12.22Form 4
Jan 9, 2026XRAYDirectorGrant or awardCode A · direct395—Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.