Michael Toporek - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Michael Toporek has filed 2 SEC Form 4 filings across 2 companies in the last 90 days - selling. Lifetime open-market sales: $328K.
Profile
Michael Toporek serves as Director of Capstone Holding Corp. (CAPS). Toporek has also held reporting roles at Soluna Holdings, Inc (SLNHP). Toporek has reported 14 insider filings with the SEC since 2024. The most recent filing was in July 2026.
| Role | Director |
|---|---|
| Notability | 36/100 |
Board memberships
- Capstone Holding Corp.
- Soluna Holdings, Inc
Reported roles
- Director
- Director
Trading Pattern
InsiderAlpha's records for Michael Toporek go back to 2024: 11 primary Form 4 filings, an average of 3.7 per year. 5 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Career & Filing History
Every role Michael Toporek 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.
- Director at Capstone Holding Corp. (CAPS) - 1 filing, 2026
- Director at Soluna Holdings, Inc (SLNHP) - 7 filings, 2024 to 2026
- Director at Capstone Holding Corp. (CAPS) - 1 filing, 2026
- Director, 10% Owner at Soluna Holdings, Inc (SLNHP) - 2 filings, 2024
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-07-24 | CAPS | Capstone Holding Corp. | A - Grant or award | 356.2K | - | |
| 2026-06-03 | SLNHP | Soluna Holdings, Inc | A - Grant or award | 7.31M | $0.00 | |
| 2025-12-03 | SLNHP | Soluna Holdings, Inc | A - Grant or award | 6.89M | $0.00 | |
| 2025-09-01 | SLNHP | Soluna Holdings, Inc | A - Grant or award | 1.00M | $0.00 | |
| 2025-06-01 | SLNHP | Soluna Holdings, Inc | A - Grant or award | 744.5K | $0.00 | |
| 2024-12-12 | SLNHP | Soluna Holdings, Inc | S - Open-market sale | 574 | $10.00 | $6K |
| 2024-12-12 | SLNHP | Soluna Holdings, Inc | S - Open-market sale | 100 | $10.40 | $1K |
| 2024-12-09 | SLNHP | Soluna Holdings, Inc | S - Open-market sale | 208 | $10.60 | $2K |
| 2024-12-09 | SLNHP | Soluna Holdings, Inc | S - Open-market sale | 12 | $11.50 | $138 |
| 2024-12-03 | SLNHP | Soluna Holdings, Inc | A - Grant or award | 370.4K | $0.00 | |
| 2024-11-12 | SLNHP | Soluna Holdings, Inc | S - Open-market sale [10b5-1] | 9.1K | $4.00 | $36K |
| 2024-11-12 | SLNHP | Soluna Holdings, Inc | S - Open-market sale [10b5-1] | 21.9K | $3.42 | $75K |
| 2024-11-07 | SLNHP | Soluna Holdings, Inc | S - Open-market sale [10b5-1] | 24.4K | $3.59 | $88K |
| 2024-11-07 | SLNHP | Soluna Holdings, Inc | S - Open-market sale [10b5-1] | 23.7K | $3.56 | $84K |
| 2024-11-07 | SLNHP | Soluna Holdings, Inc | S - Open-market sale [10b5-1] | 11.0K | $3.23 | $36K |
Companies - Last 90 Days
- Capstone Holding Corp. (CAPS) - 1 filing, last 2026-07-24
- Soluna Holdings, Inc (SLNHP) - 1 filing, last 2026-06-03
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Michael Toporek has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- William P. Phelan - $305K of SLNHP open-market activity in the last 12 months
- Matthew E. Lipman - $167K of CAPS open-market activity in the last 12 months
- Michael Picchi - $163K of SLNHP open-market activity in the last 12 months
- Mary Jennifer Oreilly - $145K of SLNHP open-market activity in the last 12 months
- Edward R. Hirshfield - $77K of SLNHP open-market activity in the last 12 months
- Jessica L. Thomas - $35K of SLNHP open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Andrew J. Mills
- Charles N. Mills
- Kevin J. Mills
- Mink Brook Asset Management LLC
- Shankh Mitra
- MITSUI SUMITOMO INSURANCE CO LTD
- Arturo R. Moreno
- Matthew T. Moroun
Frequently Asked Questions
Who is Michael Toporek?
Michael Toporek serves as Director of Capstone Holding Corp. (CAPS). Toporek has also held reporting roles at Soluna Holdings, Inc (SLNHP). Toporek has reported 14 insider filings with the SEC since 2024. The most recent filing was in July 2026.…
How many SEC Form 4 filings has Michael Toporek submitted recently?
2 primary Form 4 filings in the last 90 days, covering 2 companies.
Has Michael Toporek been buying or selling stock?
Recorded transactions: 0 open-market purchases and 9 open-market sales ($328K) across all tracked filings.
Where can I see all of Michael Toporek'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
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