Samuel M. Zentman - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Samuel M. Zentman is a corporate insider tracked by InsiderAlpha. No SEC Form 4 filings recorded in the last 90 days.
Profile
Samuel M. Zentman is a corporate insider at Greenland Mines Ltd (GRML). SEC records also connect Zentman to ACORN ENERGY, INC. (ACFN). Zentman has reported 5 insider filings with the SEC since 2024. The most recent filing was in March 2026.
| Role | Insider |
|---|---|
| Notability | 26/100 |
Board memberships
- Greenland Mines Ltd
- ACORN ENERGY, INC.
Reported roles
- Director
Trading Pattern
InsiderAlpha's records for Samuel M. Zentman go back to 2024: 5 primary Form 4 filings, an average of 1.7 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Career & Filing History
Every role Samuel M. Zentman has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- Insider at Greenland Mines Ltd (GRML) - 2 filings, 2025 to 2026
- Director at ACORN ENERGY, INC. (ACFN) - 2 filings, 2026
- Director at ACORN ENERGY, INC. (ACFN) - 1 filing, 2024
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-03-06 | GRML | Greenland Mines Ltd | A - Grant or award | 350.0K | - | |
| 2026-02-09 | ACFN | ACORN ENERGY, INC. | M - Option exercise | 625 | $4.96 | $3K |
| 2025-08-05 | GRML | Greenland Mines Ltd | A - Grant or award | 153.5K | - | |
| 2024-11-25 | ACFN | ACORN ENERGY, INC. | M - Option exercise | 625 | $3.68 | $2K |
Most Active Insiders Right Now
Samuel M. Zentman has no recent co-filers at the same companies, so here are the insiders with the largest open-market activity across the market in the last 90 days.
- MetLife Investment Management, LLC - $1600000.00B of FINS open-market activity in the last 90 days
- Magnetar Financial LLC - $16357.48B of CRWV open-market activity in the last 90 days
- Marianne Okland - $18.46B of STNG open-market activity in the last 90 days
- VisionWave Holdings, Inc. - $14.13B of SVRE open-market activity in the last 90 days
- Vanessa Allen Sutherland - $7.44B of PSX open-market activity in the last 90 days
- AI Alpine (Luxembourg) S.a.r.l. - $2.69B of INIO open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Nicholas S. Schorsch
- Trygve Seglem
- Lawrence B. Seidman
- Thomas J. Shaw
- Silver Point Capital L.P.
- SilverBay Capital Management LLC
- Michael Simanovsky
- Bob R. Simpson
Frequently Asked Questions
Who is Samuel M. Zentman?
Samuel M. Zentman is a corporate insider at Greenland Mines Ltd (GRML). SEC records also connect Zentman to ACORN ENERGY, INC. (ACFN). Zentman has reported 5 insider filings with the SEC since 2024. The most recent filing was in March 2026.…
Where can I see all of Samuel M. Zentman'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
Open the live Samuel M. Zentman profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.