Glenbrook-managed funds (SNES) boost SenesTech stake with 171K-share buys

Rhea-AI Filing Summary

SenesTech, Inc. reported that entities managed by Glenbrook Capital Management made open-market purchases of a total of 171,034 shares of Common Stock on March 13, 16 and 17, 2026, at prices between $1.79 and $1.95 per share.

After these transactions, the Glenbrook-managed accounts indirectly held 890,635 SenesTech shares. A footnote explains that this filing also corrects a prior understatement of beneficially owned shares in an earlier Form 4.

Insights

Equity ownership and insider-trading analyst

Glenbrook-managed accounts added 171K SenesTech shares in open-market buys.

Entities advised by Glenbrook Capital Management—specifically PFS Trust and the GCM Employee Profit-Sharing Plan—executed three open-market purchases of 171,034 SenesTech common shares at prices from $1.7924 to $1.9517 per share. All transactions are non-derivative common stock buys.

Following the latest trade, these accounts held 890,635 shares indirectly. Glenbrook disclaims beneficial ownership except to any pecuniary interest, which is standard language for an investment manager. A separate footnote notes this filing also corrects a previously understated ownership figure in an earlier Form 4.

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

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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)

5396 AVENUE 18 1/2

(Street)

CHOWCHILLA CA 93610

(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)
03/13/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock, $0.001 par value per share ("Common Stock")	03/13/2026		P		146,249	A	$1.9517	865,850(1)	I	See footnote(2)
Common Stock	03/16/2026		P		5,060	A	$1.8562	870,910	I	See footnote(2)
Common Stock	03/17/2026		P		19,725	A	$1.7924	890,635	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 amount of securities beneficially owned by the Reporting Person following the transaction that occurred on February 17, 2026, as reported in column 5 of Table I of the Form 4 filed by the Reporting Person on February 19, 2026, was understated by 15,390 shares of Common Stock. This understatment affected the amount of securities beneficially owned by the Reporting Person as reported in column 5 of Table I in all subsequent transactions reported on that Form 4. The amount of securities beneficially owned by the Reporting Person following the transaction reported on this line corrects this understatement.

2. The securities to which this filing relates are held directly by PFS Trust ("PFS Trust") and Glenbrook Capital Management Inc. Employee Profit-Sharing Plan ("GCM EPSP"). Glenbrook Capital Management (the "Reporting Person") serves as the investment manager to each of PFS Trust and GCM EPSP. The Reporting Person disclaims beneficial ownership of the securities to which this filing relates for purposes of Section 16 of the Securities and Exchange Act of 1934, as amended, except to the extent of its pecuniary interest therein, if any.

	Glenbrook Capital Management, By: /s/ John David Kessler, Director	03/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did Glenbrook-managed accounts do in this SenesTech (SNES) Form 4?

Entities managed by Glenbrook Capital Management bought 171,034 shares of SenesTech common stock in three open-market transactions. These non-derivative purchases increased their indirect holdings to 890,635 shares, according to the Form 4 insider trading report and its detailed transaction table.

Over what dates did the Glenbrook-managed entities buy SenesTech (SNES) shares?

The Glenbrook-managed entities purchased SenesTech common stock on March 13, 16 and 17, 2026. Each transaction was reported as an open-market purchase of non-derivative common shares, with share counts and prices detailed separately for each trading date in the Form 4 filing.

How many SenesTech (SNES) shares do the Glenbrook-managed accounts hold after these trades?

After the latest reported transaction, the Glenbrook-managed accounts indirectly hold 890,635 shares of SenesTech common stock. This post-transaction balance appears in column 5 of Table I in the Form 4 and reflects the cumulative position following the March 17, 2026 purchase.

What were the purchase prices for the SenesTech (SNES) shares in this Form 4?

The reported open-market purchase prices were $1.9517, $1.8562, and $1.7924 per share for SenesTech common stock. Each price corresponds to a separate transaction date and share amount, as specified in the non-derivative transaction details of the Form 4 filing.

Who actually holds the SenesTech (SNES) shares related to this Glenbrook Form 4?

The securities are held directly by PFS Trust and the Glenbrook Capital Management Inc. Employee Profit-Sharing Plan. Glenbrook Capital Management acts as investment manager and disclaims beneficial ownership for Section 16 purposes, except to the extent of any pecuniary interest described in the Form 4 footnote.

Does this SenesTech (SNES) Form 4 correct any earlier ownership figures?

Yes. A footnote explains that a prior Form 4 understated beneficial ownership by 15,390 shares after a February 17, 2026 transaction. The current filing’s reported post-transaction holdings are stated to correct that earlier understatement in subsequent reported ownership amounts.