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Glenbrook Capital ups SenesTech (SNES) stake with new share buys

Filing Impact
(Neutral)
Filing Sentiment
(Positive)
Form Type
4

Rhea-AI Filing Summary

Glenbrook Capital Management, as investment manager for a client account, reported open-market purchases of SenesTech common stock, increasing that account’s indirect holdings. The account bought 15,000 shares on May 14, 2026 at $1.7241 per share, 7,120 shares on May 15, 2026 at $1.6498, and 10,000 shares on May 18, 2026 at $1.5878. After these transactions, the account held 925,755 SenesTech shares indirectly managed by Glenbrook, which disclaims beneficial ownership beyond any pecuniary interest.

Positive

  • None.

Negative

  • None.

Insights

Glenbrook-managed account modestly increased its indirect SenesTech position through open-market purchases over several days.

The filing shows a client account advised by Glenbrook Capital Management buying a total of 32,120 shares of SenesTech common stock across three open-market trades. Prices ranged from $1.5878 to $1.7241 per share, indicating staggered accumulation rather than a single block purchase.

Following these transactions, the account’s indirect holdings rose to 925,755 shares. Glenbrook, a more than ten percent owner, discloses that it serves as investment manager and disclaims beneficial ownership except for any pecuniary interest. The activity appears as incremental portfolio positioning rather than a transformative change.

Insider GLENBROOK CAPITAL MANAGEMENT
Role null
Bought 32,120 shs ($53K)
Type Security Shares Price Value
Purchase Common Stock 10,000 $1.5878 $16K
Purchase Common Stock 7,120 $1.6498 $12K
Purchase Common Stock, $0.001 par value per share ("Common Stock") 15,000 $1.7241 $26K
Holdings After Transaction: Common Stock — 925,755 shares (Indirect, See footnote); Common Stock, $0.001 par value per share ("Common Stock") — 908,635 shares (Indirect, See footnote)
Footnotes (1)
  1. [object Object]
Total shares bought 32,120 shares Open-market purchases in May 2026
Shares bought May 14, 2026 15,000 shares at $1.7241 Open-market purchase of common stock
Shares bought May 15, 2026 7,120 shares at $1.6498 Open-market purchase of common stock
Shares bought May 18, 2026 10,000 shares at $1.5878 Open-market purchase of common stock
Holdings after trades 925,755 shares Indirectly held by client account managed by Glenbrook
open-market purchase financial
"transaction_action: "open-market purchase" for each common stock trade"
An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.
Section 16 regulatory
"disclaims beneficial ownership of the securities for purposes of Section 16 of the Securities and Exchange Act"
Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.
pecuniary interest financial
"except to the extent of its pecuniary interest therein, if any"
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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)
5396 AVENUE 18 1/2
(Street)
CHOWCHILLA CALIFORNIA 93610
(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)
DirectorX10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock, $0.001 par value per share ("Common Stock")05/14/2026P15,000A$1.7241908,635ISee footnote(1)
Common Stock05/15/2026P7,120A$1.6498915,755ISee footnote(1)
Common Stock05/18/2026P10,000A$1.5878925,755ISee footnote(1)
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. The securities to which this filing relates are held directly by a certain account 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 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, Director05/18/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider activity did Glenbrook Capital report for SenesTech (SNES)?

Glenbrook Capital, as investment manager for a client account, reported three open-market purchases of SenesTech common stock totaling 32,120 shares. These trades occurred on May 14, 15, and 18, 2026, modestly increasing the account’s indirect holdings in the company.

How many SenesTech (SNES) shares were held after Glenbrook’s reported trades?

After the reported transactions, the Glenbrook-managed account held 925,755 shares of SenesTech common stock indirectly. This total reflects the cumulative position following purchases on May 14, 15, and 18, 2026, as disclosed in the Form 4 insider filing data.

At what prices did the Glenbrook-managed account buy SenesTech (SNES) shares?

The account advised by Glenbrook Capital bought SenesTech common stock at prices of $1.7241, $1.6498, and $1.5878 per share. These open-market purchases on May 14, 15, and 18, 2026, show a series of buys across a narrow price range.

Does Glenbrook Capital claim full beneficial ownership of the SenesTech (SNES) shares?

No. Glenbrook states the securities are held by a client account for which it is investment manager and disclaims beneficial ownership under Section 16, except to the extent of its pecuniary interest, if any, in the SenesTech common stock position.

Is Glenbrook Capital considered a major holder of SenesTech (SNES) stock?

Yes. The Form 4 identifies Glenbrook Capital Management as a more than ten percent owner of SenesTech. The filing reflects its role managing an account that indirectly holds 925,755 SenesTech common shares after the disclosed transactions in May 2026.