Matthew Keith Custer - 29 Jul 2025 Form 4 Insider Report for CYANOTECH CORP (CYAN)

Reporting relationship: President and CEO, Director
Issuer ticker: CYAN
Reported as of: 29 Jul 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 31 Jul 2025, 13:32:48 UTC
Prior SEC filing: 18 Jun 2025
Source filing: View source filing
Reporting owner signature: /s/ Amy B. Nordin by POA

Key filing fact

Matthew Keith Custer filed Form 4 for CYANOTECH CORP (CYAN) on 31 Jul 2025.

Key facts

This page summarizes Matthew Keith Custer's Form 4 filing for CYANOTECH CORP (CYAN).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 31 Jul 2025, 13:32.

Change

Previous filing in this sequence was filed on 18 Jun 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 0001789455 Primary reporting owner

Custer Matthew Keith

Relationship: President and CEO, Director
Address: 73-4460 QUEEN KAAHUMANU HWY #102, KAILUA-KONA
Signature: /s/ Amy B. Nordin by POA
Signature date: 31 Jul 2025

Reported non-derivative transactions

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

CYAN transaction

Common Stock

Options Exercise

Transaction value: $0
Shares: +2,075
Change %: +44%
Price: $0.000000
Shares after: 6,754
Date: 29 Jul 2025
Ownership: Direct
Footnotes: F1

Reported derivative securities

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

CYAN transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value: $0
Shares: -2,075
Change %: -3.1%
Price: $0.000000
Shares after: 64,137
Date: 29 Jul 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,075
Exercise price
Footnotes: 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 3 footnotes

Footnote F1

Represents the conversion upon vesting of restricted stock units into common stock.

Footnote F2

Each restricted stock unit represents the contingent right to receive one (1) share of Cyanotech Common Stock.

Footnote F3

The restricted stock units vest as to 34 shares on April 6, 2026; 21,368 shares on June 16, 2026; 21,368 on June 16, 2027 and 21,367 shares on June 16, 2028, in each case subject to the reporting person's continued service with the Company on the vesting date.