Summary
Updated Aug 30, 2026
Mark Sheffield is Director of Massimo Group (MAMO). 2 SEC Form 4 filings on record, most recently on 22 November 2024.
Recent Transactions
2Every recent SEC Form 4 transaction Mark Sheffield has reported, most recent first.
Most Active Insiders Right Now
Mark Sheffield has no co-filers on record, so these are insiders with the largest open-market activity across the market in the last 90 days.
- Chitung Liu - $294.29M of UMC open-market activity in the last 90 days
- Peter Beck - $286.41M of RKLB open-market activity in the last 90 days
- SLTA V (GP), L.L.C. - $275.19M of FA open-market activity in the last 90 days
- Ignition Acquisition Holdings LP - $274.88M of OPLN open-market activity in the last 90 days
- Participations S.A R.L. Artal - $270.90M of CAVA open-market activity in the last 90 days
- Paul R. Vigano - $268.34M of AVAH open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Mark Sheffield?
Mark Sheffield is a corporate insider, tracked as Director of Massimo Group (MAMO). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Mark Sheffield last file a Form 4?
The most recent primary Form 4 on record is dated 22 November 2024, one of 2 filings going back to 2024.
Where can I see all of Mark Sheffield'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.
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