Updated Jul 16, 2026
GLENBROOK CAPITAL MANAGEMENT has filed 6 SEC Form 4 filings across 1 company in the last 90 days — buying. Lifetime open-market purchases: $906K. Historical track record: 2/5 stars across 13 tracked purchases.
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 | ★★☆☆☆ (2/5) |
|---|---|
| Total purchases tracked | 13 |
| Purchases with forward-return data | 13 |
| 30-day win rate | 4615% |
| 90-day win rate | 769% |
| Avg 5-day return | +370.41% |
| Avg 30-day return | -376.80% |
| Avg 90-day return | -1774.42% |
| Best 30-day return | +1910.11% |
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-07-03 | SNES | SenesTech, Inc. | P — Open-market purchase | 35.0K | $1.51 | $53K |
| 2026-06-30 | SNES | SenesTech, Inc. | P — Open-market purchase | 5.2K | $1.52 | $8K |
| 2026-06-30 | SNES | SenesTech, Inc. | P — Open-market purchase | 6.8K | $1.56 | $11K |
| 2026-06-30 | SNES | SenesTech, Inc. | P — Open-market purchase | 9.4K | $1.53 | $14K |
| 2026-06-30 | SNES | SenesTech, Inc. | P — Open-market purchase | 4.0K | $1.55 | $6K |
| 2026-06-23 | SNES | SenesTech, Inc. | P — Open-market purchase | 5.0K | $1.66 | $8K |
| 2026-06-23 | SNES | SenesTech, Inc. | P — Open-market purchase | 3.3K | $1.61 | $5K |
| 2026-06-08 | SNES | SenesTech, Inc. | P — Open-market purchase | 7.0K | $1.61 | $11K |
| 2026-06-08 | SNES | SenesTech, Inc. | P — Open-market purchase | 13.2K | $1.57 | $21K |
| 2026-06-08 | SNES | SenesTech, Inc. | P — Open-market purchase | 8.2K | $1.65 | $14K |
| 2026-05-19 | SNES | SenesTech, Inc. | P — Open-market purchase | 10.0K | $1.59 | $16K |
| 2026-05-19 | SNES | SenesTech, Inc. | P — Open-market purchase | 7.1K | $1.65 | $12K |
| 2026-05-19 | SNES | SenesTech, Inc. | P — Open-market purchase | 15.0K | $1.72 | $26K |
| 2026-04-30 | SNES | SenesTech, Inc. | P — Open-market purchase | 3.0K | $1.47 | $4K |
| 2026-03-18 | SNES | SenesTech, Inc. | P — Open-market purchase | 19.7K | $1.79 | $35K |
| 2026-03-18 | SNES | SenesTech, Inc. | P — Open-market purchase | 5.1K | $1.86 | $9K |
| 2026-03-18 | SNES | SenesTech, Inc. | P — Open-market purchase | 146.2K | $1.95 | $285K |
| 2026-02-20 | SNES | SenesTech, Inc. | P — Open-market purchase | 34.6K | $2.40 | $83K |
| 2026-02-20 | SNES | SenesTech, Inc. | P — Open-market purchase | 10.5K | $2.29 | $24K |
| 2026-02-20 | SNES | SenesTech, Inc. | P — Open-market purchase | 40.8K | $2.29 | $93K |
GLENBROOK CAPITAL MANAGEMENT is a corporate insider — currently tracked as 10% Owner of SenesTech, Inc. (SNES). InsiderAlpha tracks every SEC Form 4 filing in real time.
6 primary Form 4 filings in the last 90 days, covering 1 company.
Recorded transactions: 27 open-market purchases ($906K) and 0 open-market sales () across all tracked filings.
Across 13 tracked purchases, GLENBROOK CAPITAL MANAGEMENT averaged -376.8% avg 30-day return with a 4615% 30-day win rate. InsiderAlpha rates the track record at 2/5 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 GLENBROOK CAPITAL MANAGEMENT profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.