SEPTInvestingStart Free

SNES SCHEDULE 13D/A: Activist campaign

Glenbrook Capital Management

Filed with the SEC on · accession 0000902664-26-004214

SNES filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Oct 19, 2026. Glenbrook Capital Management disclosed it now owns over 30% of SenesTech's outstanding shares and sent a letter to the Chairman urging a sharper marketing strategy, capital discipline, reduced equity dilution, and consideration of equity-based compensation instead of cash. The stock moved +8.2% by the first close after the filing.

Summary of the filing

Glenbrook Capital Management disclosed it now owns over 30% of SenesTech's outstanding shares and sent a letter to the Chairman urging a sharper marketing strategy, capital discipline, reduced equity dilution, and consideration of equity-based compensation instead of cash. Glenbrook also retained branding firm Sandstrom Partners at its own expense to advise the company.

For details, click here →

Key details

Glenbrook ownership stake in SenesTech outstanding sharespercent 30
SenesTech Q3 topline growthpercent 40
SenesTech revenue run rate$4.0M
Activist shareholder owning over 30% of senestechGlenbrook Capital Management
Target companySenesTech, Inc.
Branding and marketing strategy firm retained by glenbrookSandstrom Partners
Ceo, glenbrook capital managementGrover Wickersham
Chairman of the board, senestech, inc.Matthew Szot

How SNES stock reacted

Close before

$0.65

Oct 16, 2026

First close after

+8.21%

$0.70

5 trading days

+29.85%

$0.84

Since filing

+70.81%

$1.10

✦ Ask GOAX AI about this filing — what it means for SNES, what changed since its last filings and what to watch next.

Try it free for 7 days

🔔 Want to stay updated on new SEC filings for SNES?

Click here

Frequently asked questions

What did SNES file with the SEC on Oct 19, 2026?

SNES filed a SCHEDULE 13D/A (Activist campaign). Glenbrook Capital Management disclosed it now owns over 30% of SenesTech's outstanding shares and sent a letter to the Chairman urging a sharper marketing strategy, capital discipline, reduced equity dilution, and consideration of equity-based compensation instead of cash. Glenbrook also retained branding firm Sandstrom Partners at its own expense to advise the company.

What does a activist campaign mean for SNES stock?

A settlement removes uncertainty; the stock often reacts to whether the amount is bigger or smaller than investors expected.

How do I read a SCHEDULE 13D/A?

A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).

How did SNES stock react to this filing?

SNES closed at $0.65 before the filing and $0.70 on Oct 19, 2026 (+8.21%). Five trading days later: $0.84 (+29.85%).

Other SNES SEC filings

Get alerts when SNES files with the SEC, plus live charts, key levels and news for 13,000+ stocks.

Try SEPT free for 7 days
SNES overviewSNES analysisSNES newsLatest SEC filings