Summary
Updated Aug 30, 2026
Nathaniel Sisitsky is Chief Legal Officer of QuidelOrtho Corp (QDEL). 2 SEC Form 4 filings on record going back to 2025, most recently on 22 April 2026.
Recent Transactions
1Every recent SEC Form 4 transaction Nathaniel Sisitsky has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Nathaniel Sisitsky files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- BROADWOOD PARTNERS, L.P. - $62.75M of STAA open-market activity in the last 12 months
- Brian J. Blaser - $750K of QDEL open-market activity in the last 12 months
- Joseph M. Busky - $284K of QDEL open-market activity in the last 12 months
- Matthew Strobeck - $240K of QDEL open-market activity in the last 12 months
- Kenneth J. Widder - $112K of QDEL open-market activity in the last 12 months
- Mary Lake Ph D. Polan - $22K of QDEL open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Nathaniel Sisitsky?
Nathaniel Sisitsky is a corporate insider, tracked as Chief Legal Officer of QuidelOrtho Corp (QDEL). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Nathaniel Sisitsky last file a Form 4?
The most recent primary Form 4 on record is dated 22 April 2026, one of 2 filings going back to 2025.
Where can I see all of Nathaniel Sisitsky's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Follow Nathaniel Sisitsky and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial
