Mark Alan Mason - 15 May 2026 Form 4 Insider Report for Guerrilla RF, Inc. (GUER)

Reporting relationship: Chief Operating Officer
Issuer ticker: GUER
Reported as of: 15 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 19 May 2026, 10:31:49 UTC
Prior SEC filing: 18 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Iain MacSween, Attorney-in-Fact

Key filing fact

Mark Alan Mason filed Form 4 for Guerrilla RF, Inc. (GUER) on 19 May 2026.

Key facts

This page summarizes Mark Alan Mason's Form 4 filing for Guerrilla RF, Inc. (GUER).
1 reported transaction and 6 derivative rows are listed below.
Accepted by SEC: 19 May 2026, 10:31.

Change

Previous filing in this sequence was filed on 18 Nov 2025.
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 0001892393 Primary reporting owner

Mason Mark Alan

Relationship: Chief Operating Officer
Address: 682 INVERNESS DRIVE, WINSTON-SALEM
Signature: /s/ Iain MacSween, Attorney-in-Fact
Signature date: 19 May 2026

Reported non-derivative transactions

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

GUER holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 31,110
Date: 15 May 2026
Ownership: Direct

Reported derivative securities

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

GUER transaction Derivative

Stock Option

Award

Transaction value
Shares: +27,500
Change %
Price: $0.000000^*
Shares after: 27,500
Date: 15 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 27,500
Exercise price: $6.00
Footnotes: F6

GUER holding Derivative

Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 24,590
Date: 15 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 24,590
Exercise price: $2.20
Footnotes: F2

GUER holding Derivative

Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 1,774
Date: 15 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,774
Exercise price: $3.19
Footnotes: F2

GUER holding Derivative

Restricted Stock Unit

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 5,897
Date: 15 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 5,897
Exercise price
Footnotes: F1, F3, F4

GUER holding Derivative

Stock Option

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 25,000
Date: 15 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 25,000
Exercise price: $3.05
Footnotes: F5

GUER holding Derivative

Warrant

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 834
Date: 15 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 834
Exercise price: $2.50

^* 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

Each restricted stock unit represents the contingent right to receive one share of common stock upon vesting of the unit.

Footnote F2

The shares subject to the option are fully vested and exercisable.

Footnote F3

No expiration date.

Footnote F4

The restricted stock units vest on 1/1/2027, subject to the Reporting Person's continued service through the applicable vesting date

Footnote F5

The options vest as follows: (i) 6,250 options on 5/21/2026; (ii) 520 options on 6/21/26, and monthly thereafter through 4/21/29; and (iii) 550 options on 5/21/2029, in each case subject to the Reporting Person's continued service through the applicable vesting date.

Footnote F6

The options vest as follows: (i) 6,875 options on 5/15/2027; (ii) 1,718 options on 8/15/2027, and quarterly thereafter through 2/15/2030; and (iii) 1,727 options on 5/15/2030, in each case subject to the Reporting Person's continued service through the applicable vesting date.