SenesTech, Inc. disclosure: Glenbrook Capital Management reports beneficial ownership of 890,635 shares of Common Stock, representing 16.8% of the class based on 5,303,426 shares outstanding as of March 11, 2026. The filing states these shares are held by affiliated vehicles, including PFS Trust, and that shared voting and dispositive power is reported.
Positive
None.
Negative
None.
Insights
Large passive stake disclosed by an investment manager and affiliated vehicles.
The filing shows Glenbrook Capital Management reports 890,635 shares and 16.8% ownership using an outstanding share base of 5,303,426 as of March 11, 2026. The shares are held through affiliated accounts, with shared voting and dispositive power reported.
Decision rights are shared among named parties and PFS Trust has rights to dividends or proceeds. Future filings may clarify any changes in voting arrangements or transfers.
Reporting emphasizes shared control and attribution to affiliated vehicles.
The statement attributes ownership to Glenbrook Capital Management with management oversight by named individuals and notes that PFS Trust and an employee profit-sharing plan hold the reported shares. The filing includes a standard disclaimer regarding Section 13 beneficial ownership attribution.
Watch for amendments or Form 13D if active coordination or control intentions change; current filing is informational about ownership structure.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
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)
(CUSIP Number)
03/16/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP No.
1
Names of Reporting Persons
Glenbrook Capital Management
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
NEVADA
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
890,635.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
890,635.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
890,635.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
16.8 %
12
Type of Reporting Person (See Instructions)
CO
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
SenesTech, Inc.
(b)
Address of issuer's principal executive offices:
13430 North Dysart Road, Suite 105, Surprise, AZ 85379
Item 2.
(a)
Name of person filing:
This report on Schedule 13G is being filed by Glenbrook Capital Management, a Nevada corporation ("GCM" or the "Reporting Person"), with respect to the shares of common stock, par value $0.001 per share (the "Common Stock"), of SenesTech, Inc., a Delaware corporation (the "Issuer"). Grover T. Wickersham, the managing member of GCM, Richard Rudgley, and Robert W. Lishman serve on the investment committee of GCM, which serves as the investment manager to each of PFS Trust ("PFS Trust") and Glenbrook Capital Management Inc. Employee Profit-Sharing Plan, which hold the shares of Common Stock reported herein.
The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, the beneficial owner of the securities reported herein.
(b)
Address or principal business office or, if none, residence:
The address for the Reporting Person is 5396 Avenue 18 1/2, Chowchilla, CA 93610.
(c)
Citizenship:
GCM is a Nevada corporation.
(d)
Title of class of securities:
Common Stock, par value $0.001 per share
(e)
CUSIP No.:
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
The information required by Item 4(a) is set forth in Row 9 of the cover page for the Reporting Person and is incorporated herein by reference.
The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 5,303,426 shares of Common Stock outstanding as of March 11, 2026, as reported in the Issuer's Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the Securities and Exchange Commission on March 13, 2026.
(b)
Percent of class:
16.8%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for the Reporting Person and is incorporated herein by reference.
(ii) Shared power to vote or to direct the vote:
The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for the Reporting Person and is incorporated herein by reference.
(iii) Sole power to dispose or to direct the disposition of:
The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for the Reporting Person and is incorporated herein by reference.
(iv) Shared power to dispose or to direct the disposition of:
The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for the Reporting Person and is incorporated herein by reference.
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
See Item 2(a). PSF Trust has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, more than 5 percent of the outstanding shares of Common Stock.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
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.
What stake does Glenbrook Capital Management report in SenesTech (SNES)?
Glenbrook reports beneficial ownership of 890,635 shares, equal to 16.8% of the class. This percentage uses 5,303,426 shares outstanding as of March 11, 2026 from the issuer's Form 10-K.
Are the SenesTech shares held directly by Glenbrook Capital Management?
The filing states the shares are held by affiliated vehicles, including PFS Trust and an employee profit-sharing plan. Glenbrook serves as investment manager; the filing attributes ownership to those accounts rather than asserting sole individual ownership.
What voting and dispositive powers are reported for the 890,635 shares?
The report lists shared voting power and shared dispositive power of 890,635 shares. Sole voting and sole dispositive power are reported as 0 on the cover page details incorporated by reference.
Does the filing indicate who controls voting decisions for the shares?
The filing names Glenbrook's investment committee members and notes that Grover T. Wickersham, Richard Rudgley, and Robert W. Lishman serve on the committee. It discloses shared control via the investment manager structure rather than a single controller.
How was the outstanding share count determined for the ownership percentage?
The 5,303,426 shares outstanding figure is taken from the issuer's Annual Report on Form 10-K for the fiscal year ended December 31, 2025, as reported in that filing on March 13, 2026, and used to calculate 16.8%.
