Buy4

SenesTech, Inc.

SNES

Total Value

$29.1K

Net $29.1K bought

Filing Date

Oct 30, 2026

2 transactions

Purchases

$29.1K

2 transactions

Trade Summary

On Oct 28, 2026 through Oct 30, 2026, GLENBROOK CAPITAL MANAGEMENT, 10% Owner, purchased $29.1K of SenesTech, Inc. (SNES) across 2 transactions. The filing covers Common Stock, par value $0.001 per share and reflects net buying of $29.1K. Reported prices ranged from $0.97 to $1.02. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Price at the Time of the Trade

SNES daily price with the insider's purchase marked at $0.97.

Bought in the lower half of the 6-month range · the stock trades 12% higher today.

Price data is delayed and provided for context only — not investment advice.

Insider Information

Name: GLENBROOK CAPITAL MANAGEMENT
Role: 10% Owner
Location: MINDEN, NV

Filing Details

Filing Date: Oct 30, 2026
Transaction Date: Oct 28, 2026
Accession Number: 0001731122-26-001386
Form Type: 4
Net Trading Amount: $29.1K

Non-Derivative Transactions

Date	Security	Shares	Price	Type	Value
Oct 28, 2026	Common Stock, par value $0.001 per share	28,000	$0.97	Purchase	$27.0K
Oct 30, 2026	Common Stock	2,000	$1.02	Purchase	$2.0K

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Footnotes

(F1)The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.8299 to $1.00, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
(F2)The securities to which this filing relates are held directly by certain accounts for which Glenbrook Capital Management serves as investment manager. The Reporting Person disclaims beneficial ownership of the securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.
(F3)The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.9870 to $1.0900, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
(F4)The Reporting Person's Form 3 filed on February 2, 2026 reported Series I Common Stock Warrants exercisable for 90,000 shares of Common Stock. As of that date, and as of the date of this report, the Reporting Person's indirect holdings of Series I Common Stock Warrants were exercisable for an aggregate of 180,000 shares of Common Stock, consisting of 90,000 shares held by PFS Trust and 90,000 shares held by the Glenbrook Capital Management Inc. Employees Profit-Sharing Plan ("GCM EPSP"). This report reflects the Reporting Person's holdings of Series I Common Stock Warrants as corrected. The Form 3 also reported an expiration date of November 13, 2026; the correct expiration date is set forth in footnote (6). There has been no transaction in the Series I Common Stock Warrants since the filing of the Form 3.
(F5)Pursuant to the terms of the Series I Common Stock Warrants, the Reporting Person cannot exercise any of the warrants to the extent the Reporting Person would beneficially own, after any such exercise, more than 4.99% of the outstanding Common Stock for the warrants held by GCM EPSP, or 9.99% of the outstanding Common Stock for the warrants held by PFS Trust. Consequently, the Reporting Person is not currently able to exercise the warrants reported herein.
(F6)The Series I Common Stock Warrants expire on the fifteen-month anniversary of the effective date of the Issuer's resale registration statement on Form S-3 (File No. 333-289650), which became effective on August 22, 2025. Because November 22, 2026 is not a Trading Day, under the terms of the warrants they may be exercised until 5:00 p.m. (New York City time) on the next succeeding Trading Day, November 23, 2026.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

GLENBROOK CAPITAL MANAGEMENT

(Last)

(First)

(Middle)

2207, SUITE B, BELLANCA ST.

(Street)

MINDEN

89423

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
SenesTech, Inc. [ SNES ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/28/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock, par value $0.001 per share	10/28/2026		P		28,000	A	$0.9651⁽¹⁾	2,194,973	I	See footnote⁽²⁾
Common Stock	10/30/2026		P		2,000	A	$1.0167⁽³⁾	2,196,973	I	See footnote⁽²⁾

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Series I Common Stock Warrants (right to buy)	$5.25							08/13/2025	11/22/2026⁽⁶⁾	Common Stock	90,000		90,000⁽⁴⁾⁽⁵⁾	I	I - By PFS Trust⁽²⁾
Series I Common Stock Warrants (right to buy)	$5.25							08/13/2025	11/22/2026⁽⁶⁾	Common Stock	90,000		90,000⁽⁴⁾⁽⁵⁾	I	I - By PFS Trust⁽²⁾

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.8299 to $1.00, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

2. The securities to which this filing relates are held directly by certain accounts for which Glenbrook Capital Management serves as investment manager. The Reporting Person disclaims beneficial ownership of the securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

3. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.9870 to $1.0900, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

4. The Reporting Person's Form 3 filed on February 2, 2026 reported Series I Common Stock Warrants exercisable for 90,000 shares of Common Stock. As of that date, and as of the date of this report, the Reporting Person's indirect holdings of Series I Common Stock Warrants were exercisable for an aggregate of 180,000 shares of Common Stock, consisting of 90,000 shares held by PFS Trust and 90,000 shares held by the Glenbrook Capital Management Inc. Employees Profit-Sharing Plan ("GCM EPSP"). This report reflects the Reporting Person's holdings of Series I Common Stock Warrants as corrected. The Form 3 also reported an expiration date of November 13, 2026; the correct expiration date is set forth in footnote (6). There has been no transaction in the Series I Common Stock Warrants since the filing of the Form 3.

5. Pursuant to the terms of the Series I Common Stock Warrants, the Reporting Person cannot exercise any of the warrants to the extent the Reporting Person would beneficially own, after any such exercise, more than 4.99% of the outstanding Common Stock for the warrants held by GCM EPSP, or 9.99% of the outstanding Common Stock for the warrants held by PFS Trust. Consequently, the Reporting Person is not currently able to exercise the warrants reported herein.

6. The Series I Common Stock Warrants expire on the fifteen-month anniversary of the effective date of the Issuer's resale registration statement on Form S-3 (File No. 333-289650), which became effective on August 22, 2025. Because November 22, 2026 is not a Trading Day, under the terms of the warrants they may be exercised until 5:00 p.m. (New York City time) on the next succeeding Trading Day, November 23, 2026.

	/s/ Robert W. Lishman	10/30/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Form 4 as rendered by the SEC from accession 0001731122-26-001386.

SenesTech, Inc.

Trade Summary

Price at the Time of the Trade

Company Information

Insider Information

Filing Details

Non-Derivative Transactions

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Footnotes

SEC Form 4

SEC Filing

SEC Form 4

Price at the Time of the Trade