Justin Michael LeBeau filed a Schedule 13D with the SEC on October 26, 2026, disclosing beneficial ownership of 294,773 shares of SenesTech, Inc. common stock, representing approximately 5.4% of the company's outstanding shares, following open-market purchases triggered by an event dated October 23, 2026.

Key Highlights

  • Aggregate beneficial ownership: LeBeau beneficially owns 294,773 shares of SenesTech common stock, equal to approximately 5.4% of the 5,423,542 shares outstanding as of August 4, 2026.
  • Total acquisition cost: According to the filing, all 294,773 shares were acquired through open-market purchases for an aggregate purchase price of approximately $229,261.57, including brokerage commissions where applicable.
  • Split ownership structure: 64,862 shares are held in LeBeau's individual brokerage account, and 229,911 shares are held in a joint tenancy account with his spouse, Laurel Michelle LeBeau.
  • Source of funds: The filing identifies personal funds (code: PF) as the source, with approximately $60,805.04 from LeBeau's individual funds and approximately $168,456.53 from combined personal funds with his spouse.
  • Stated investment thesis: LeBeau disclosed that he acquired the shares for investment purposes, stating in the filing that he "believes the Common Stock is significantly undervalued relative to the Issuer's underlying product potential and market opportunity."
  • Governance concerns cited: The filing states LeBeau believes the company's board and management should "exercise greater capital discipline, reduce operating expenses," align compensation with stockholder interests, and "end its recurring practice of dilutive equity offerings."
  • No group coordination: The filing states LeBeau "is acting independently and has not entered into any agreement, arrangement, or understanding with Glenbrook or any other stockholder" with respect to SenesTech.

LeBeau's SenesTech Position: Ownership Details and Stated Concerns

According to the Schedule 13D filed on October 26, 2026, Justin Michael LeBeau, a private investor based in Scottsdale, Arizona, accumulated 294,773 shares of SenesTech, Inc. (NASDAQ:SNES) common stock through open-market purchases. The filing lists an event date of October 23, 2026. LeBeau holds 64,862 shares with sole voting and dispositive power and 229,911 shares with shared voting and dispositive power alongside his spouse, Laurel Michelle LeBeau, through a joint tenancy brokerage account.

The filing details a series of purchases in LeBeau's individual account over the past sixty days, beginning August 28, 2026, at prices ranging from $0.85 to $1.08 per share across multiple trading sessions. Individual-account purchases in that window totaled 59,862 shares for an aggregate cost of $52,705.04, according to the disclosure. The total cost across both accounts was approximately $229,261.57. The shares are held in standard brokerage accounts which, the filing notes, "may at any given time have margin integration and/or subject the securities held therein to customary margin terms and conditions."

LeBeau's filing also references a public letter sent by Glenbrook Capital Management to SenesTech's board chairman on October 19, 2026, which was filed as Exhibit 99.1 to Glenbrook's Schedule 13D/A on that date. LeBeau states he agrees with certain views in that letter, including those on "minimizing equity dilution, exercising capital and expense discipline, aligning executive and Board compensation with stockholder performance through performance conditioned equity in lieu of cash compensation, and improving commercial and marketing execution." The filing explicitly states he has not coordinated with Glenbrook or any other stockholder. The percentage ownership calculation is based on 5,423,542 shares outstanding as reported in SenesTech's Form 10-Q for the quarterly period ended June 30, 2026.

What Was Disclosed

Justin Michael LeBeau filed a Schedule 13D disclosing 294,773 shares, or approximately 5.4%, of SenesTech, Inc. common stock acquired through open-market purchases at an aggregate cost of approximately $229,261.57, citing investment purposes and governance concerns about dilution and capital discipline.