JONATHAN JAY MAZELSKY
CIK 1556270 · President and CEO · last filed 2026-07-02
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$59.40M
Companies
3
Total Filings
95
Lifetime Open-Market Net
-$79.50M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Recent Filings · Page 8 of 10
95 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2020-01-16 | IDXX | Exer (M) | +2,188 | $100.3K | EDGAR |
| 2019-11-05 | IDXX | Exer (M) | — | $0 | EDGAR |
| 2019-08-09 | IDXX | Exer (M) | +11,358 | $536.1K | EDGAR |
| 2019-08-07 | IDXX | Mixed | — | -$2.13M | EDGAR |
| 2019-02-19 | IDXX | Mixed | +1,813 | -$157.7K | EDGAR |
| 2018-12-07 | IDXX | Mixed | +515 | -$87.8K | EDGAR |
| 2018-02-16 | IDXX | Mixed | +1,837 | -$138.7K | EDGAR |
| 2017-12-07 | IDXX | Mixed | +490 | -$75.3K | EDGAR |
| 2017-09-06 | IDXX | Mixed | +1,186 | -$182.9K | EDGAR |
| 2017-02-16 | IDXX | Mixed | +1,438 | -$101.8K | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.