GLENBROOK CAPITAL MANAGEMENT is an investment firm that reports beneficial ownership of shares in SenesTech, Inc. (SNES) under U.S. securities law. It has submitted 12 SEC insider filings since 2026, most recently in July 2026.
Every role GLENBROOK CAPITAL MANAGEMENT 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.
SenesTech, Inc. (SNES)6 filingsUpdated Aug 30, 2026
GLENBROOK CAPITAL MANAGEMENT is 10% Owner of SenesTech, Inc. (SNES). 13 SEC Form 4 filings on record, most recently on 10 August 2026. Most recent open-market trade: bought $8K of SNES on 10 August 2026. Lifetime open-market purchases: $986K. Historical track record: 3/5 stars across 17 tracked purchases.
Every recent SEC Form 4 transaction GLENBROOK CAPITAL MANAGEMENT has reported, most recent first.
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★★☆☆ (3/5) |
| Total purchases tracked | 17 |
| Purchases with forward-return data | 17 |
| 30-day win rate | 53% |
| 90-day win rate | 6% |
| Avg 5-day return | +3.81% |
| Avg 30-day return | -1.57% |
| Avg 90-day return | -18.38% |
| Best 30-day return |
InsiderAlpha's records for GLENBROOK CAPITAL MANAGEMENT go back to 2026: 13 primary Form 4 filings, an average of 13.0 per year. The typical open-market purchase is $33K (30 buys totaling $986K). The largest single buy on record is $285K of SNES in 2026. 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.
Insiders who reported open-market trades in the last 12 months at the companies GLENBROOK CAPITAL MANAGEMENT files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
GLENBROOK CAPITAL MANAGEMENT is an investment firm, tracked as 10% Owner of SenesTech, Inc. (SNES). InsiderAlpha holds 13 primary Form 4 filings for it, the earliest from 2026, updated as new SEC EDGAR filings are processed.
6 primary Form 4 filings in the last 90 days, covering 1 company.
Recorded transactions: 30 open-market purchases ($986K) and 0 open-market sales across all tracked filings.
Across 17 tracked purchases, GLENBROOK CAPITAL MANAGEMENT averaged -1.6% avg 30-day return with a 53% 30-day win rate. InsiderAlpha rates the track record at 3/5 stars.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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$SNES SenesTech, Inc.35.0K shares @ $1.47$52K
| +22.60% |