Mark A. Emalfarb - Sep 15, 2025 Form 4 Insider Report for DYADIC INTERNATIONAL INC (DYAI)

Role: CEO, Director, 10%+ Owner
Signature: /s/ Ping Rawson, attorney-in-fact
Stock symbol: DYAI
Transactions as of: Sep 15, 2025
Transactions value $: $1,000,000
Form type: 4
Date filed: 9/17/2025, 05:00 PM
Previous filing: Jan 7, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
EMALFARB MARK A	CEO, Director, 10%+ Owner	C/O DYADIC INTERNATIONAL, INC., 1044 NORTH U.S. HIGHWAY ONE, SUITE 201, JUPITER	/s/ Ping Rawson, attorney-in-fact	2025-09-17	0001328287

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	DYAI	Senior Secured Convertible Promissory Note due March 8, 2027	Purchase	$1M				$1M	Sep 15, 2025	Common Stock	714K	$1.40	Through Mark A Emalfarb Trust U/A/ DTD 10/1/1987	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents a purchase of $1,000,000 principal amount of Senior Secured Convertible Promissory Note due March 8, 2027 (the "Convertible Notes.") The Convertible Notes are senior, secured obligations of the Issuer and its affiliates, and interest is payable quarterly in cash on the principal amount equal to 8% per annum. The Convertible Notes will mature on March 8, 2027, unless earlier converted, repurchased, or redeemed in accordance with their terms. The Convertible Notes have a conversion price of $1.40 per share of common stock.

Content

Represents a purchase of $1,000,000 principal amount of Senior Secured Convertible Promissory Note due March 8, 2027 (the "Convertible Notes.") The Convertible Notes are senior, secured obligations of the Issuer and its affiliates, and interest is payable quarterly in cash on the principal amount equal to 8% per annum. The Convertible Notes will mature on March 8, 2027, unless earlier converted, repurchased, or redeemed in accordance with their terms. The Convertible Notes have a conversion price of $1.40 per share of common stock.