William Tu - 16 Sep 2026 Form 4 Insider Report for Glass House Brands Inc. (GLAS)

Reporting relationship: SVP, Corporate Controller
Issuer ticker: GLAS
Reported as of: 16 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 18 Sep 2026, 16:05:13 UTC
Prior SEC filing: 11 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Benjamin Vega, Attorney-in-Fact for William Tu

Key filing fact

William Tu filed Form 4 for Glass House Brands Inc. (GLAS) on 18 Sep 2026.

Key facts

This page summarizes William Tu's Form 4 filing for Glass House Brands Inc. (GLAS).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 18 Sep 2026, 16:05.

Change

Previous filing in this sequence was filed on 11 Sep 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002120766 Primary reporting owner

Tu William

Relationship: SVP, Corporate Controller
Address: 3645 LONG BEACH BLVD, LONG BEACH
Signature: /s/ Benjamin Vega, Attorney-in-Fact for William Tu
Signature date: 18 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

GLAS transaction

Equity Shares

Options Exercise

Transaction value
Shares: +38,691
Change %: +1023%
Price
Shares after: 42,474
Date: 16 Sep 2026
Ownership: Direct
Footnotes: F1, F3

GLAS transaction

Equity Shares

Tax liability

Transaction value
Shares: -13,523
Change %: -32%
Price: $8.08^*
Shares after: 28,951
Date: 16 Sep 2026
Ownership: Direct
Footnotes: F1, F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

GLAS transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value
Shares: -38,691
Change %: -28%
Price: $0.000000^*
Shares after: 100,580
Date: 16 Sep 2026
Ownership: Direct
Underlying class: Equity Shares
Underlying amount: 38,691
Exercise price: $0.000000
Footnotes: F1, F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

The Subordinate Voting Shares, Restricted Voting Shares, and/or Limited Voting Shares of Glass House Brands Inc. ("GHBI") (collectively, the "Equity Shares").

Footnote F2

The Reporting Person was granted RSU awards covering 116,071 RSUs on February 1, 2025 (the "February RSUs"). An initial tranche of 38,691 of the February RSUs vested on September 16, 2026.

Footnote F3

Each RSU represents the right to receive, at settlement, one share of GHBI's Equity Shares.

Footnote F4

The Equity Shares were sold to satisfy the Reporting Person's tax withholding obligations. Represents the Equity Shares sold at a weighted average sale price of $8.08 per share. The Equity Shares were sold in multiple transactions at prices ranging from $8.00 to $8.16. The Reporting Person will provide, upon request by the staff of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer, full information regarding the number of Equity Shares sold at each separate price.