Mark A. Emalfarb - 02 Jan 2026 Form 4 Insider Report for DYADIC INTERNATIONAL INC (DYAI)

Reporting relationship: CEO, Director, 10%+ Owner
Issuer ticker: DYAI
Reported as of: 02 Jan 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 06 Jan 2026, 18:04:36 UTC
Prior SEC filing: 29 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ Ping Rawson, attorney-in-fact

Key filing fact

Mark A. Emalfarb filed Form 4 for DYADIC INTERNATIONAL INC (DYAI) on 06 Jan 2026.

Key facts

This page summarizes Mark A. Emalfarb's Form 4 filing for DYADIC INTERNATIONAL INC (DYAI).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 06 Jan 2026, 18:04.

Change

Previous filing in this sequence was filed on 29 Dec 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 0001328287 Primary reporting owner

EMALFARB MARK A

Relationship: CEO, Director, 10%+ Owner
Address: C/O DYADIC INTERNATIONAL, INC., 1044 NORTH U.S. HIGHWAY ONE, SUITE 201, JUPITER
Signature: /s/ Ping Rawson, attorney-in-fact
Signature date: 06 Jan 2026

Reported non-derivative transactions

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

DYAI transaction

Common Stock

Award

Transaction value: $0
Shares: +102,609
Change %: +2.2%
Price: $0.000000
Shares after: 4,832,667
Date: 02 Jan 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

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

DYAI transaction Derivative

Stock Option

Award

Transaction value: $0
Shares: +126,000
Change %
Price: $0.000000
Shares after: 126,000
Date: 02 Jan 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 126,000
Exercise price: $0.9400
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 common stock issued upon the vesting of RSUs. The RSUs were granted pursuant to the Issuer's key employee annual bonus, in lieu of a cash bonus earned for the year ended 2025. The RSUs vested in full upon grant.

Footnote F2

Annual grant of stock options.

Footnote F3

This option vests in four equal installments beginning on the first anniversary of the date of grant, subject to continued service to the Issuer.