Insider profile
Jonathan Jay Mazelsky Insider Trading
This page tracks every SEC Form 4 filing since April 2023 by Jonathan Jay Mazelsky, President and CEO: 127 transactions in total, including 1 open-market purchase and 31 sales. Each record is parsed directly from the original filing, with amendments reconciled so a corrected filing never double-counts.
- Role
- President and CEO · Director
- CIK
- 0001556270
- Companies traded
- 2
- Total filings
- 127
- First filing
- 2023-05-04
- Last filing
- 2026-07-01
Files as MAZELSKY JONATHAN JAY · SEC EDGAR ↗
Activity summary
The most recent open-market decision was a purchase of 10,000 shares ($101K) on June 12, 2026.
Three year balance
Buy and sell value by quarter, Q4 23 to Q3 26. Jonathan Jay Mazelsky has been a net seller across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $18.5M.
Insider insight
Jonathan Jay Mazelsky trades most actively in IDXX, accounting for 23 of the 127 filings on record. The largest single open-market purchase on record is $101K in XRAY, filed Jun 2026.
Track record
Most active in
Transaction History
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jul 1, 2026 | Jonathan Jay Mazelsky | PODD | Award | 1,355 | — | — |
| Jun 30, 2026 | Jonathan Jay Mazelsky | XRAY | Award | 2,841.83 | $10.56 | $30K |
| Jun 12, 2026 | Jonathan Jay Mazelsky | XRAY | Purchase | 10,000 | $10.14 | $101K |
| Jun 3, 2026 | Jonathan Jay Mazelsky | XRAY | Award | 22,822 | — | — |
| Mar 31, 2026 | Jonathan Jay Mazelsky | XRAY | Award | 2,644.64 | $11.34 | $30K |
45 more transactions hidden
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-H "X-Api-Key: $KEY"Companies traded
By number of filings.
Based on the last 50 filings on file — this insider has a longer history.
Filing cadence
Filings per quarter, this window.
Busiest: Q1 26 (26 filings)
Quietest: Q3 26 (1 filing)
Based on the last 50 filings on file — this insider has a longer history.
Reading an insider's Form 4 history
Corporate insiders — directors, officers, and holders of more than 10% of a company's stock — must report their trades to the SEC on Form 4 within two business days. Looking at one insider's filings over time shows whether they tend to buy on the open market (a discretionary use of their own money, generally the strongest signal), sell, or simply receive and exercise equity awards as compensation.
The track record above measures how this insider's past open-market purchases performed in the months after each filing. Trades made under a pre-scheduled Rule 10b5-1 plan are flagged because they carry no timing signal. To pull any insider's full history programmatically, see the insider trading API or our guide to reading Form 4 filings.