SenesTech: Glenbrook buys shares October 20–22

The 10% owner reported indirect purchases held directly by investment-managed accounts and disclaimed beneficial ownership except to the extent of any pecuniary interest.

Rhea-AI Filing Summary

SenesTech, Inc. (SNES) reported that Glenbrook Capital Management, a 10% owner, purchased common stock indirectly through accounts it manages: 36,375 shares on October 20, 2026, at a weighted average price of $0.6746 per share; 60,000 shares on October 21 at $0.7385 per share; and 7,500 shares on October 22 at $0.7986 per share. After the October 20 purchase, reported holdings were 2,099,473 shares. Glenbrook disclaimed beneficial ownership for Section 16 purposes except to the extent of any pecuniary interest, if any; no Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Buyer: 103,875 shares

Net Buy 3 txns

Insider GLENBROOK CAPITAL MANAGEMENT

Role 10% Owner

Bought 103,875 shs ($75K)

Type	Security	Shares	Price	Value
Purchase	Common Stock F4, F2	7,500	$0.7986	$6K
Purchase	Common Stock F3, F2	60,000	$0.7385	$44K
Purchase	Common Stock, $0.001 par value per share ("Common Stock") F1, F2	36,375	$0.6746	$25K

Holdings After Transaction: Common Stock, $0.001 par value per share ("Common Stock") — 2,099,473 shares (Indirect, See footnote); Common Stock — 2,166,973 shares (Indirect, See footnote)

Footnotes (4)

1. F1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.6613 to $0.6933, 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 herein.
2. F2. The securities to which this filing relates are held directly by certain accounts for which Glenbrook Capital Management (the "Reporting Person") serves as the investment manager. The Reporting Person disclaims beneficial ownership of the securities to which this filing relates for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of its pecuniary interest therein, if any, 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. F3. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.7227 to $0.7564, 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 herein.
4. F4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.7877 to $0.8095, 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 herein.

Key Figures

Shares purchased: 36,375 shares Weighted average purchase price: $0.6746 per share Shares purchased: 60,000 shares +4 more

7 metrics

Shares purchased 36,375 shares October 20, 2026

Weighted average purchase price $0.6746 per share October 20, 2026

Shares purchased 60,000 shares October 21, 2026

Weighted average purchase price $0.7385 per share October 21, 2026

Shares purchased 7,500 shares October 22, 2026

Weighted average purchase price $0.7986 per share October 22, 2026

Shares held after transaction 2,099,473 shares After the October 20, 2026 purchase

Key Terms

weighted average price, beneficial ownership, pecuniary interest

3 terms

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

beneficial ownership regulatory

"disclaims beneficial ownership of the securities"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest regulatory

"except to the extent of its pecuniary interest therein, if any"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What SNES share purchases did Glenbrook Capital Management report?

Glenbrook Capital Management reported indirect purchases of 36,375 shares on October 20, 2026, at a weighted average $0.6746 per share; 60,000 shares on October 21 at $0.7385; and 7,500 shares on October 22 at $0.7986. The respective purchase-price ranges were $0.6613 to $0.6933, $0.7227 to $0.7564, and $0.7877 to $0.8095, inclusive. No Rule 10b5-1 plan is reported.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/22/2026 - 06:45 PM EDT Accepted by SEC EDGAR 10/22/2026 - 06:45 PM EDT Learn about SEC filing dates

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 NEVADA 89423

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/20/2026

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

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

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

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock, $0.001 par value per share ("Common Stock")	10/20/2026		P		36,375	A	$0.6746(1)	2,099,473	I	See footnote(2)
Common Stock	10/21/2026		P		60,000	A	$0.7385(3)	2,159,473	I	See footnote(2)
Common Stock	10/22/2026		P		7,500	A	$0.7986(4)	2,166,973	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

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 $0.6613 to $0.6933, 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 herein.

2. The securities to which this filing relates are held directly by certain accounts for which Glenbrook Capital Management (the "Reporting Person") serves as the investment manager. The Reporting Person disclaims beneficial ownership of the securities to which this filing relates for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except to the extent of its pecuniary interest therein, if any, 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 $0.7227 to $0.7564, 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 herein.

4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.7877 to $0.8095, 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 herein.

	Glenbrook Capital Management, By: /s/ Robert W. Lishman, Director	10/22/2026
	** 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: SEC 1474 (03-26)