Insider Trading

Mark Guinan Net Worth

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Last Updated: 4 months ago

Mark Guinan has an estimated net worth of at least $17.6 million*, as of Oct. 29, 2025. They own 98,981 shares of DGX stock.

Mark Guinan $DGX SEC Form 4 Insider Trading

Mark Guinan has filed a total of 0 insider trades in $DGX since 2021. We estimate that they now own 98,981 shares of $DGX, worth an estimated $17.6 million.



Insider Trading at $DGX

There have been a total of 124 insider trades reported at $DGX since 2021, with 0 shares purchased and 1.1 million shares sold. The most active insider traders in $DGX stock have been Michael E Prevoznik, Stephen H Rusckowski, and J. E. Davis. The most recent trade was a sale of 958 shares reported by Patrick Plewman (SVP for Diagnostic Services), made on Feb 19, 2026.



History of Insider Stock Trades by Mark Guinan

Company Ticker Purchase / Sale Shares Date Disclosed (EST)
No Trades Available - - - -




$DGX Executives and Stock Owners with Insider Trades



*This is only based off of information found in SEC filings, and may not reflect actual net worth. There may also be inaccuracies due to privately holdings filing errors, parsing errors, accidental double-counting of shares, incorrect classification of indirectly owned shares, sales prior to dataset start date, or any other number of issues.