Dyadic director gets options and RSU awards

Dyadic International director Seth Herbst reported equity compensation changes.

Accepted by SEC EDGAR 01/06/2026 - 06:07 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Dyadic International director Seth Herbst reported equity compensation changes. On January 2, 2026, 21,552 restricted stock units were converted into the same number of shares of Dyadic common stock at a price of $0 per share, increasing his directly held common stock to 202,311 shares.

On the same date, Herbst received an annual grant of 50,000 stock options with an exercise price of $0.94 per share, exercisable from January 2, 2027 until January 2, 2036. He was also granted 39,894 restricted stock units, which the disclosure explains will be settled 100% in Dyadic common stock when they vest on the first anniversary of the grant date, subject to his continued service on the board.

Insider Trade Summary

21,552 shares exercised/converted

Exercise 4 txns

Insider HERBST SETH

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	21,552	$0.00	$0.00
Grant/Award	Stock Option	50,000	$0.00	$0.00
Grant/Award	Restricted Stock Unit	39,894	$0.00	$0.00
Exercise	Common Stock	21,552	$0.00	$0.00

Holdings After Transaction: Stock Option — 50,000 contracts (Direct); Restricted Stock Unit — 39,894 contracts (Direct); Common Stock — 202,311 shares (Direct)

Holdings Before and After: Stock Option, 0 to 50,000 contracts (Direct); Restricted Stock Unit, 21,552 to 39,894 contracts (Direct); Common Stock, 180,759 to 202,311 shares (Direct)

Footnotes (5)

1. F1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
2. F2. Annual grant of stock options.
3. F3. Annual grant of restricted stock units.
4. F4. The restricted stock units will be settled 100% in Issuer's common stock when vested upon the first anniversary of the date of grant, subject to continued service as a member of the board of directors.
5. F5. The restricted stock units previously issued and vested upon the first anniversary of the date of grant, subject to continued service as a member of the board of directors, were settled 100% in Issuer's common stock.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

HERBST SETH

(Last) (First) (Middle)

C/O DYADIC INTERNATIONAL, INC.

1044 NORTH U.S. HIGHWAY ONE, SUITE 201

(Street)

JUPITER FL 33477-5094

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
DYADIC INTERNATIONAL INC [ DYAI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
01/02/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	01/02/2026		M		21,552	A	(1)	202,311	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	(1)	01/02/2026		M			21,552	(5)	(5)	Common Stock	21,552	$0	0	D
Stock Option	$0.94	01/02/2026		A(2)		50,000		01/02/2027	01/02/2036	Common Stock	50,000	$0	50,000	D
Restricted Stock Unit	(1)	01/02/2026		A(3)		39,894		(4)	(4)	Common Stock	39,894	$0	39,894	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

2. Annual grant of stock options.

3. Annual grant of restricted stock units.

4. The restricted stock units will be settled 100% in Issuer's common stock when vested upon the first anniversary of the date of grant, subject to continued service as a member of the board of directors.

5. The restricted stock units previously issued and vested upon the first anniversary of the date of grant, subject to continued service as a member of the board of directors, were settled 100% in Issuer's common stock.

	/s/ Ping Rawson, attorney-in-fact	01/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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