SenesTech: Glenbrook reports 39.95% ownership stake

All transactions Glenbrook reports since its prior amendment were in the open market.

Rhea-AI Filing Summary

Glenbrook Capital Management amended its beneficial-ownership report concerning SenesTech, Inc. (SNES), stating it beneficially owns 2,166,973 common shares, or 39.95% of the class. Glenbrook reports shared voting and dispositive power over those shares. The reported percentage is based on 5,423,542 SenesTech shares outstanding as of August 4, 2026.

The amendment states that approximately $4.14 million, excluding brokerage commissions, was paid to acquire the reported securities using general working capital of the Glenbrook Funds and Accounts.

Key Figures

Beneficially owned common shares: 2,166,973 shares Ownership of class: 39.95% Shares outstanding: 5,423,542 shares +1 more

4 metrics

Beneficially owned common shares 2,166,973 shares Reported by Glenbrook Capital Management

Ownership of class 39.95% Based on shares outstanding as of August 4, 2026

Shares outstanding 5,423,542 shares As of August 4, 2026

Purchase amount Approximately $4.14 million Paid to acquire the reported securities, excluding brokerage commissions

Key Terms

beneficially owned, Shared Voting Power, margin accounts

3 terms

beneficially owned financial

"aggregate number of shares ... beneficially owned"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Shared Voting Power financial

"Shared Voting Power 2,166,973.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

margin accounts financial

"Positions in the shares of Common Stock may be held in margin accounts"

A margin account is a brokerage account that lets an investor borrow money from the broker to buy more securities than they could with cash alone, using the securities in the account as security for the loan. Think of it like a mortgage for stock purchases: borrowing increases potential gains but also magnifies losses, can trigger a forced sale if the account falls below required limits, and carries interest costs—factors investors must manage carefully.

FAQ

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

How many SNES shares does Glenbrook Capital Management report owning?

Glenbrook reports beneficial ownership of 2,166,973 SenesTech common shares, representing 39.95% of the class. It reports shared voting and dispositive power over those shares.

How much did Glenbrook pay to acquire the SNES securities it reports?

The amendment reports that approximately $4.14 million, excluding brokerage commissions, was paid to acquire the securities. The funds came from the general working capital of the Glenbrook Funds and Accounts.

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

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Available on EDGAR 10/22/2026 - 06:35 PM EDT Accepted by SEC EDGAR 10/22/2026 - 06:35 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 2)

SenesTech, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

81720R604

(CUSIP Number)

Glenbrook Capital Management
2207, Suite B, Bellanca St.,
Minden, NV, 89423
650-441-9525

Ele Klein & Danny Goldstein
McDermott Will & Schulte LLP, 919 Third Avenue
New York, NY, 10022
212-756-2446

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

10/21/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 81720R604

1

Name of reporting person

GLENBROOK CAPITAL MANAGEMENT

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

NEVADA

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 2,166,973.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 2,166,973.00

11

Aggregate amount beneficially owned by each reporting person

2,166,973.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

39.95 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $0.001 per share
(b)	Name of Issuer: SenesTech, Inc.
(c)	Address of Issuer's Principal Executive Offices: 13430 NORTH DYSART ROAD, SUITE 105, SURPRISE, ARIZONA , 85379.
Item 1 Comment: This Amendment No. 2 ("Amendment No. 2") amends the statement on Schedule 13D filed with the SEC on July 23, 2026, as amended by Amendment No. 1 filed with the SEC on October 19, 2026 (as amended, the "Schedule 13D") with respect to the Common Stock of the Issuer. This Amendment No. 2 amends Item 3 and 5(a)-(c), as set forth below. Capitalized terms used herein and not otherwise defined in this Amendment No. 2 have the meanings set forth in the Schedule 13D.
Item 3.	Source and Amount of Funds or Other Consideration
	Item 3 is hereby amended and restated as follows: Funds for the purchase of the securities reported herein were derived from the general working capital of the Glenbrook Funds and Accounts. A total of approximately $4.14 million (excluding brokerage commissions) was paid to acquire such securities. Positions in the shares of Common Stock may be held in margin accounts. Because other securities may be held in such margin accounts, it may not be possible to determine the amounts, if any, of margin used to purchase the shares of Common Stock.
Item 5.	Interest in Securities of the Issuer
(a)	Item 5(a) is hereby amended and restated as follows: See rows (11) and (13) of the cover page to this Schedule 13D for the aggregate number of shares of Common Stock and percentages of shares of Common Stock beneficially owned by the Reporting Person. The aggregate percentage of shares of Common Stock reported to be beneficially owned by the Reporting Person is based upon 5,423,542 shares of Common Stock outstanding as of August 4, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2026, filed with the SEC on August 6, 2026.
(b)	Item 5(b) is hereby amended and restated as follows: See rows (7) through (10) of the cover page to this Schedule 13D for the number of shares of Common Stock as to which the Reporting Person has the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition.
(c)	Item 5(c) is hereby amended and restated as follows: All transactions in the shares of Common Stock effected by the Reporting Person since the filing of Amendment No. 1, which were all in the open market, are set forth in Schedule A hereto, and are incorporated herein by reference.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

GLENBROOK CAPITAL MANAGEMENT

Signature:	/s/ Robert W. Lishman
Name/Title:	Robert W. Lishman, Director
Date:	10/22/2026