MAZELSKY JONATHAN JAY sold ~$69M in IDEXX Laboratories Inc stock
IDEXX Laboratories Inc (IDXX) · Data via SEC EDGAR Form 4
Price Performance · 10 days before → 90 days after trade
▲ = insider buy date
Trade Details · Public SEC Filing
Insider
MAZELSKY JONATHAN JAY
Role
—
Transaction
Open-Market Sale
Approx. Value
~$69M
Trade Date
Aug 22, 2025
Company
IDEXX Laboratories Inc
Ticker
IDXXSource
SEC EDGAR Form 4
Why This Trade Stands Out
Strong conviction signal
Scored above average across multiple factors. Roughly 15% of insider trades qualify as Strong.
~$69M sale
Trades over $1M are rare. When insiders put this much of their own money on the line, they tend to have high conviction in their company's direction.
6 insiders traded in the same window
When multiple insiders independently buy within 30 days, it's called a cluster. Studies show clustered insider purchases outperform solo trades significantly, because several people with inside knowledge are reaching the same conclusion.
How good is MAZELSKY JONATHAN JAY at picking stocks?
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MAZELSKY JONATHAN JAY wasn't the only one selling.
6 insiders at IDEXX Laboratories Inc traded within the same 30-day window.
See who else bought · FreeOn August 22, 2025, MAZELSKY JONATHAN JAY — a corporate insider at IDEXX Laboratories Inc — filed a Form 4 with the SEC disclosing an open-market sale of approximately ~$69M in IDEXX Laboratories Inc (IDXX) stock.
This transaction was part of a cluster — 6 insiders at IDEXX Laboratories Inc made open-market sales within the same 30-day window. Cluster activity from multiple independent insiders is one of the most studied patterns in insider trading research.
Under Section 16(a) of the Securities Exchange Act of 1934, corporate insiders must report all open-market stock transactions to the SEC within two business days. These filings — known as Form 4s — are publicly available on the SEC's EDGAR database. VeritySignals filters and scores the full Form 4 stream to surface high-conviction signals like this one.
VeritySignals Conviction Analysis
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All data sourced from publicly available SEC Form 4 filings via EDGAR · Not financial advice · Past performance does not guarantee future results.
At a Glance
More IDXX Insider Activity
MAZELSKY JONATHAN JAY
Feb 26, 2026
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MAZELSKY JONATHAN JAY
Feb 10, 2026
~$29M
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MAZELSKY JONATHAN JAY
Aug 6, 2025
~$34M
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MAZELSKY JONATHAN JAY
Feb 7, 2024
~$25M
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How to Read Insider Trades
What is this?
When company executives buy or sell their own stock, they must report it to the SEC within 2 days. These public filings reveal what the people who know the company best are doing with their own money.
Why does it matter?
Insiders can sell for many reasons (taxes, diversification, expenses), but they generally only buy for one: they think the stock is going up. That's why insider purchases are more predictive than sales.
What makes a trade "strong"?
We score trades on 15+ factors: the insider's role (CEO > director), trade size relative to their salary, whether other insiders also bought (clusters), and historical accuracy of the insider.
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