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SCHEDULE 13D/A Filed 2026-10-19 Event 2026-10-15 SEC 0000902664-26-004214 →

GLENBROOK CAPITAL MANAGEMENT → SenesTech, Inc. SNES

Stake: 38.04% Shares: 2,063,098 CUSIP: 81720R604 Class: Common Stock, par value $0.0001 per share

Item 4 — Purpose of Transaction

Item 4 is hereby amended and supplemented as follows: From time to time, the Reporting Person may engage with members of the board of directors of the Issuer (the "Board") and management, and may engage with other stockholders and other relevant parties, regarding, without limitation, its concerns regarding the composition of the Board, including whether the Board, as currently constituted, has the appropriate mix of skills, experience and perspectives to oversee the Issuer's strategy and execution, and issues regarding the size, composition and refreshment of the Board, the identification of potential director candidates, Board leadership and committee composition, and the Issuer's corporate governance practices. Depending on the outcome of such discussions and other factors the Reporting Person deems relevant, the Reporting Person may take such actions with respect to the composition of the Board as it deems appropriate, which may include recommending changes to the Board, seeking to fill any vacancy on the Board, or proposing or nominating one or more director candidates for election at a meeting of the Issuer's stockholders. The Reporting Person has not made any determination as to any specific course of action, and there can be no assurance that the Reporting Person will take any such action. On October 19, 2026, GCM issued a press release and public letter regarding the Issuer, which is attached as Exhibit 99.1 hereto and incorporated by reference herein.

Cross-References

Insider Activity (last 365d)
4 transactions
4 buys · 0 sales · 0 awards/exercises
Issuer Cluster
3 13D/G filings on this issuer
2 other filings besides this one
Filer Track Record
2 filings by this filer
1 other filing in the data moat
Short Interest · settle 2026-09-30
DTC 1.00
27,380 shares short · -10.6% vs prior

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-06-29 GLENBROOK CAPITAL MANAGEMENT 10%+ owner Buy 5,172 $1.52 $8K
2026-06-26 GLENBROOK CAPITAL MANAGEMENT 10%+ owner Buy 6,812 $1.56 $11K
2026-06-25 GLENBROOK CAPITAL MANAGEMENT 10%+ owner Buy 9,442 $1.53 $14K
2026-06-24 GLENBROOK CAPITAL MANAGEMENT 10%+ owner Buy 3,990 $1.55 $6K

Other 13D/G Filings on SenesTech, Inc.

FiledFormFilerStakeShares
2026-07-23 SCHEDULE 13D GLENBROOK CAPITAL MANAGEMENT — 1,057,804 view →
2018-01-09 SC SABBY MANAGEMENT, LLC — — view →

Other Filings by GLENBROOK CAPITAL MANAGEMENT

FiledFormIssuerStakeShares
2026-07-23 SCHEDULE 13D SenesTech, Inc. — 1,057,804 view →

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