Updated Jul 16, 2026
Klein Mark D has filed 2 SEC Form 4 filings across 1 company in the last 90 days — buying. Lifetime open-market purchases: $612K. Historical track record: 5/5 stars across 6 tracked purchases.
Mark D. Klein is the Chairman, CEO, and President of SuRo Capital Corp, a closed-end management investment company. He has held various roles within the company and has been involved in its operations as a director.
| Role | Chairman, CEO and President, Director |
|---|---|
| Notability | 30/100 |
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realised performance after each tracked open-market purchase.
| InsiderAlpha rating | ★★★★★ (5/5) |
|---|---|
| Total purchases tracked | 6 |
| Purchases with forward-return data | 6 |
| 30-day win rate | 10000% |
| 90-day win rate | 10000% |
| Avg 5-day return | +623.79% |
| Avg 30-day return | +1121.32% |
| Avg 90-day return | +1575.69% |
| Best 30-day return | +2168.67% |
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-17 | SSSS | SURO CAPITAL CORP. | F — Tax withholding / forfeiture | 293.3K | $13.56 | $3.98M |
| 2026-06-17 | SSSS | SURO CAPITAL CORP. | A — Grant or award | 350.0K | $0.00 | |
| 2026-04-22 | SSSS | SURO CAPITAL CORP. | P — Open-market purchase | 2.5K | $13.25 | $33K |
| 2026-04-22 | SSSS | SURO CAPITAL CORP. | P — Open-market purchase | 2.5K | $13.08 | $33K |
| 2025-12-16 | SSSS | SURO CAPITAL CORP. | F — Tax withholding / forfeiture | 17.0K | $9.24 | $157K |
| 2025-12-16 | SSSS | SURO CAPITAL CORP. | F — Tax withholding / forfeiture | 17.0K | $9.59 | $163K |
| 2025-11-25 | SSSS | SURO CAPITAL CORP. | A — Grant or award | 174.5K | $0.00 | |
| 2025-08-11 | SSSS | SURO CAPITAL CORP. | P — Open-market purchase | 10.0K | $8.45 | $84K |
| 2025-08-11 | SSSS | SURO CAPITAL CORP. | P — Open-market purchase | 4.6K | $8.69 | $40K |
| 2024-12-18 | SSSS | SURO CAPITAL CORP. | F — Tax withholding / forfeiture | 17.0K | $6.02 | $102K |
| 2024-12-12 | SSSS | SURO CAPITAL CORP. | F — Tax withholding / forfeiture | 21.3K | $6.14 | $131K |
| 2024-12-12 | SSSS | SURO CAPITAL CORP. | A — Grant or award | 100.0K | $0.00 | |
| 2024-12-04 | SSSS | SURO CAPITAL CORP. | P — Open-market purchase | 743 | $5.49 | $4K |
| 2024-11-29 | SSSS | SURO CAPITAL CORP. | P — Open-market purchase | 39.0K | $5.20 | $203K |
| 2024-11-29 | SSSS | SURO CAPITAL CORP. | P — Open-market purchase | 32.3K | $5.10 | $165K |
| 2024-11-29 | SSSS | SURO CAPITAL CORP. | P — Open-market purchase | 10.0K | $5.03 | $50K |
Mark D. Klein is the Chairman, CEO, and President of SuRo Capital Corp, a closed-end management investment company. He has held various roles within the company and has been involved in its operations as a director.…
2 primary Form 4 filings in the last 90 days, covering 1 company.
Recorded transactions: 8 open-market purchases ($612K) and 0 open-market sales () across all tracked filings.
Across 6 tracked purchases, Klein Mark D averaged +1121.3% avg 30-day return with a 10000% 30-day win rate. InsiderAlpha rates the track record at 5/5 stars.
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.
Open the live Klein Mark D profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.