Glenbrook's rapid accumulation to nearly 40% ownership signals high conviction and potential for board representation demands or a formal activist campaign. Monitor for a response from SenesTech's board and any further 13D amendments detailing specific demands or a proxy fight.
Price Chart
Executive Summary
Glenbrook Capital Management increased its stake in SenesTech to 39.95% (2,166,973 shares), purchasing 103,875 additional shares in the open market over three days at prices between $0.66 and $0.81. This follows their October 19 letter crossing 30% ownership and publicly urging the board to minimize equity dilution, improve marketing strategy, and consider equity-based compensation to conserve cash.
Key Financial Metrics
Key Facts
- Glenbrook now beneficially owns 2,166,973 shares, representing 39.95% of SenesTech's outstanding common stock.
- Purchased 103,875 shares in open market from October 20-22, 2026, at weighted average prices of $0.6746, $0.7385, and $0.7986.
- Total cost to acquire all securities reported is approximately $4.14 million.
- Glenbrook's October 19 letter publicly urged the board to end dilutive offerings, improve marketing, and consider equity-based compensation.
- SenesTech reported record Q3 2026 revenue of ~$1.1 million (~55% YoY growth) on October 15, 2026.
Financial Impact
Glenbrook spent approximately $73,000 on the 103,875 shares purchased in this amendment, increasing its stake from >30% to 39.95%.
Risk Factors
- Glenbrook's public letter is advisory and non-binding; the board may resist changes, leading to a prolonged activist standoff.
- SenesTech's history of dilutive offerings and reverse splits could continue if revenue growth does not translate to profitability.
Investment Themes
Documents Analyzed
This report is based on 4 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13D/A Filing (Primary) | 0000902664-26-004256 |
| Document: 0000902664-26-004256-index-headers.html | 0000902664-26-004256 |
| Document: 0000902664-26-004256-index.html | 0000902664-26-004256 |
| Document: 0000902664-26-004256.txt | 0000902664-26-004256 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 26, 2026 today | SC 13D | $0.8300 | awaiting T+5 | — | $0.8400 (+1.20%) |
Oct 22, 2026 4d ago | SC 13D/A | $0.8400 | awaiting T+5 | — | $0.8400 (−0.00%) |
Oct 22, 2026 4d ago | 8-K | $0.7990 | awaiting T+5 | — | $0.8400 (−5.13%) |
Oct 22, 2026 4d ago | Press Release | $0.7990 | awaiting T+5 | — | $0.8400 (+5.13%) |
Oct 19, 2026 7d ago | SC 13D/A | $0.6893 | awaiting T+5 | — | $0.8400 (+21.86%) |
Oct 19, 2026 7d ago | Press Release | $0.7000 $0.8065 | ▲ +15.21% | ▲ +15.36% | $0.8400 (+20.00%) |
Oct 15, 2026 11d ago | 8-K | $0.6992 $0.7990 | ▲ +14.27% | ▲ +15.29% | $0.8400 (+20.14%) |
Oct 15, 2026 11d ago | Press Release | $0.6992 $0.7990 | ▲ +14.27% | ▲ +15.29% | $0.8400 (+20.14%) |
Aug 3, 2026 12w ago | 8-K | $1.55 $1.27 | ▼ −18.06% | ▼ −20.09% | $0.8400 (−45.81%) |
Jun 9, 2026 19w ago | Insider Cluster | $1.72 $1.65 | ▼ −4.07% | ▼ −7.50% | $0.8400 (−51.16%) |
US Market Status
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