Mathi Gurusamy - 01 Sep 2026 Form 4 Insider Report for LANTRONIX INC (LTRX)

Reporting relationship: Chief Product & Strategy Ofcr
Issuer ticker: LTRX
Reported as of: 01 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 03 Sep 2026, 16:13:22 UTC
Prior SEC filing: 28 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Brent Stringham, Attorney-in-fact for Mathi Gurusamy

Key filing fact

Mathi Gurusamy filed Form 4 for LANTRONIX INC (LTRX) on 03 Sep 2026.

Key facts

This page summarizes Mathi Gurusamy's Form 4 filing for LANTRONIX INC (LTRX).
10 reported transactions and 4 derivative rows are listed below.
Accepted by SEC: 03 Sep 2026, 16:13.

Change

Previous filing in this sequence was filed on 28 Aug 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 0002021595 Primary reporting owner

Gurusamy Mathi

Relationship: Chief Product & Strategy Ofcr
Address: C/O LANTRONIX, INC., 48 DISCOVERY SUITE 250, IRVINE
Signature: /s/ Brent Stringham, Attorney-in-fact for Mathi Gurusamy
Signature date: 03 Sep 2026

Reported non-derivative transactions

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

LTRX transaction

Common Stock

Options Exercise

Transaction value
Shares: +3,334
Change %: +4.1%
Price: $0.000000^*
Shares after: 84,140
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F1

LTRX transaction

Common Stock

Options Exercise

Transaction value
Shares: +7,975
Change %: +9.5%
Price: $0.000000^*
Shares after: 92,115
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F2

LTRX transaction

Common Stock

Options Exercise

Transaction value
Shares: +7,118
Change %: +7.7%
Price: $0.000000^*
Shares after: 99,233
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F3

LTRX transaction

Common Stock

Tax liability

Transaction value
Shares: -8,452
Change %: -8.5%
Price: $5.15^*
Shares after: 90,781
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F4

LTRX transaction

Common Stock

Options Exercise

Transaction value
Shares: +15,335
Change %: +17%
Price: $0.000000^*
Shares after: 106,116
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F5

LTRX transaction

Common Stock

Tax liability

Transaction value
Shares: -7,035
Change %: -6.6%
Price: $5.15^*
Shares after: 99,081
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F6

Reported derivative securities

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

LTRX transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -3,334
Change %: -25%
Price: $0.000000^*
Shares after: 10,004
Date: 01 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,334
Exercise price
Footnotes: F1

LTRX transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -7,975
Change %: -25%
Price: $0.000000^*
Shares after: 23,924
Date: 01 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,975
Exercise price
Footnotes: F2

LTRX transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -7,118
Change %: -13%
Price: $0.000000^*
Shares after: 49,825
Date: 01 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,118
Exercise price
Footnotes: F3

LTRX transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -15,335
Change %: -42%
Price: $0.000000^*
Shares after: 21,469
Date: 01 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 15,335
Exercise price
Footnotes: F5

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

Represents restricted stock units ("RSUs") granted on July 1, 2024. The restricted stock units ("RSUs") shall vest such that one-third (1/3) of the shares vest on July 1, 2025 and the remaining two-thirds (2/3) of the total number of shares vest quarterly thereafter beginning on September 1, 2025, such that one hundred percent (100%) of the RSUs will be fully vested on June 1, 2027.

Footnote F2

Represents RSUs granted on June 1, 2024. The RSUs shall vest such that one-third (1/3) of the shares vest on June 1, 2025 and the remaining two-thirds (2/3) of the total number of shares vest quarterly thereafter beginning on September 1, 2025, such that one hundred percent (100%) of the RSUs will be fully vested on June 1, 2027.

Footnote F3

Represents RSUs granted on July 11, 2025. The RSUs shall vest such that one-third (1/3) of the shares vest on July 11, 2026 and the remaining two-thirds (2/3) of the total number of shares vest quarterly thereafter beginning on September 1, 2026, such that one hundred percent (100%) of the RSUs will be fully vested on June 1, 2028.

Footnote F4

In accordance with the terms of the RSU Agreement, 8,452 shares of Lantronix, Inc. common stock were withheld at vesting to cover required tax withholding.

Footnote F5

On July 11, 2025, the reporting person was granted RSUs with performance-based vesting requirements. The number of RSUs that were eligible to vest based on certain earnings per share targets and revenue targets for fiscal 2026 shall vest such that 15,335 shares vest on September 1, 2026 and the remaining 21,469 shares vest quarterly thereafter beginning December 1, 2026 such that one hundred percent (100%) of the RSUs will be fully vested on June 1, 2028.

Footnote F6

In accordance with the terms of the applicable RSUs with performance-based vesting requirements award agreements, 7,035 shares of Lantronix, Inc. common stock were withheld at vesting to cover required tax withholding.