SEC ownership of DYADIC INTERNATIONAL INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001213809.
- CIK
- 0001213809
- Symbol
- DYAI on Nasdaq
- Location
- Jupiter, FL
- Parsed ownership evidence
- 13D/G, 3/4/5, and 13F
- Lead holder
- Mark A. Emalfarb
- 13D/G signal
- Mark A. Emalfarb
- Latest evidence date
- 31 Mar 2026
Ownership snapshot
Top shareholders of DYADIC INTERNATIONAL INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with the largest verified stakes, then open the linked filing trail.
Lead holder
Mark A. Emalfarb
13D/G signal
Mark A. Emalfarb
Evidence rows
48
Latest as of
31 Mar 2026
13D/G
3/4/5
13F
Lead comparable stake: 18%
13D/G row: Mark A. Emalfarb
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Mark A. Emalfarb |
13D/G
3/4/5
CEO, Director, 10%+ Owner
|
18%
|
$6,274,913
6,675,439 shares
|
+$405,229 | 31 Dec 2025 |
| Francisco Trust under agreement dated February 28, 1996 |
3/4/5
13D/G
10%+ Owner
|
12%
from 13D/G
|
$4,896,969
3,548,528 shares
|
— | 27 Jul 2021 |
| Bandera Partners LLC |
13D/G
|
4.6%
|
$1,355,642
1,383,308 shares
|
$0 | 30 Jun 2025 |
| APIS CAPITAL ADVISORS, LLC |
13F
Company
|
3.5%
|
$1,042,197
1,270,972 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
2.5%
|
$761,151
928,233 shares
|
— | 31 Mar 2026 |
| CHAPIN DAVIS, INC. |
13F
Company
|
2.4%
|
$728,166
888,004 shares
|
— | 31 Mar 2026 |
| TRUIST FINANCIAL CORP |
13F
Company
|
0.89%
|
$267,484
326,200 shares
|
— | 31 Mar 2026 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
0.86%
|
$257,123
313,508 shares
|
— | 31 Mar 2026 |
| BlackRock, Inc. |
13F
Company
|
0.76%
|
$225,849
275,425 shares
|
— | 31 Mar 2026 |
| VANGUARD FIDUCIARY TRUST CO |
13F
Company
|
0.38%
|
$114,372
139,478 shares
|
— | 31 Mar 2026 |
| MARATHON CAPITAL MANAGEMENT |
13F
Company
|
0.3%
|
$90,200
110,000 shares
|
— | 31 Mar 2026 |
| Sage Mountain Advisors LLC |
13F
Company
|
0.29%
|
$87,382
106,564 shares
|
— | 31 Mar 2026 |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. |
13F
Company
|
0.27%
|
$79,553
97,016 shares
|
— | 31 Mar 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
0.22%
|
$66,965
81,665 shares
|
— | 31 Mar 2026 |
| HighTower Advisors, LLC |
13F
Company
|
0.22%
|
$65,165
79,469 shares
|
— | 31 Mar 2026 |
| AlphaCore Capital LLC |
13F
Company
|
0.2%
|
$59,295
72,311 shares
|
— | 31 Mar 2026 |
| AE Wealth Management LLC |
13F
Company
|
0.15%
|
$44,080
53,756 shares
|
— | 31 Mar 2026 |
| PERKINS CAPITAL MANAGEMENT INC |
13F
Company
|
0.13%
|
$39,401
48,050 shares
|
— | 31 Mar 2026 |
| STATE STREET CORP |
13F
Company
|
0.12%
|
$34,891
42,550 shares
|
— | 31 Mar 2026 |
| Pekin Hardy Strauss, Inc. |
13F
Company
|
0.11%
|
$34,231
41,745 shares
|
— | 31 Mar 2026 |
| LPL Financial LLC |
13F
Company
|
0.09%
|
$27,091
33,038 shares
|
— | 31 Mar 2026 |
| NORTHERN TRUST CORP |
13F
Company
|
0.09%
|
$26,938
32,851 shares
|
— | 31 Mar 2026 |
| Inlet Private Wealth, LLC |
13F
Company
|
0.08%
|
$24,600
30,000 shares
|
— | 31 Mar 2026 |
| Robertson Stephens Wealth Management, LLC |
13F
Company
|
0.08%
|
$24,575
29,969 shares
|
— | 31 Mar 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP |
13F
Company
|
0.07%
|
$21,259
25,925 shares
|
— | 31 Mar 2026 |
| TWO SIGMA SECURITIES, LLC |
13F
Company
|
0.06%
|
$17,722
21,612 shares
|
— | 31 Mar 2026 |
| Black Diamond Financial, LLC |
13F
Company
|
0.05%
|
$15,851
19,331 shares
|
— | 31 Mar 2026 |
| CAPTRUST FINANCIAL ADVISORS |
13F
Company
|
0.04%
|
$12,300
15,000 shares
|
— | 31 Mar 2026 |
| COMMONWEALTH EQUITY SERVICES, LLC |
13F
Company
|
0.03%
|
$10,310
12,579 shares
|
— | 31 Mar 2026 |
| SIMPLEX TRADING, LLC |
13F
Company
|
0.03%
|
$9,903
12,078 shares
|
— | 31 Mar 2026 |
| HANCOCK WHITNEY CORP |
13F
Company
|
0.03%
|
$9,111
11,111 shares
|
— | 31 Mar 2026 |
| HOEY INVESTMENTS, INC |
13F
Company
|
0.03%
|
$8,075
9,847 shares
|
— | 31 Mar 2026 |
| Vanguard Global Advisers, LLC |
13F
Company
|
0.02%
|
$6,056
7,385 shares
|
— | 31 Mar 2026 |
| PNC FINANCIAL SERVICES GROUP, INC. |
13F
Company
|
0.01%
|
$3,280
4,000 shares
|
— | 31 Mar 2026 |
| MORGAN STANLEY |
13F
Company
|
0%
|
$186
227 shares
|
— | 31 Mar 2026 |
| WELLS FARGO & COMPANY/MN |
13F
Company
|
0%
|
$146
178 shares
|
— | 31 Mar 2026 |
| BARCLAYS PLC |
13F
Company
|
0%
|
$59
72 shares
|
— | 31 Mar 2026 |
| BNP PARIBAS FINANCIAL MARKETS |
13F
Company
|
0%
|
$57
69 shares
|
— | 31 Mar 2026 |
| JPMORGAN CHASE & CO |
13F
Company
|
0%
|
$21
29 shares
|
— | 31 Mar 2026 |
| Michael P. Tarnok |
3/4/5
Director
|
—
mixed-class rows
|
$358,933
306,033 shares
mixed-class rows
|
— | 20 Jun 2025 |
| Seth Herbst |
3/4/5
Director
|
—
mixed-class rows
|
$221,192
292,205 shares
mixed-class rows
|
— | 02 Jan 2026 |
| Joseph P. Hazelton |
3/4/5
President & COO
|
—
mixed-class rows
|
$189,840
259,008 shares
mixed-class rows
|
+$24,700 | 02 Jan 2026 |
| Ping Wang Rawson |
3/4/5
Chief Financial Officer
|
—
mixed-class rows
|
$168,449
217,401 shares
mixed-class rows
|
— | 02 Jan 2026 |
| Barry Buckland |
3/4/5
Director
|
—
mixed-class rows
|
$127,033
127,934 shares
mixed-class rows
|
— | 11 Jun 2024 |
| Jack Kaye |
3/4/5
Director
|
—
mixed-class rows
|
$101,293
188,595 shares
mixed-class rows
|
— | 02 Jan 2026 |
| Arindam Bose |
3/4/5
Director
|
—
mixed-class rows
|
$97,208
129,035 shares
mixed-class rows
|
— | 20 Jun 2025 |
| Patrick K. Lucy |
3/4/5
Director
|
—
mixed-class rows
|
$92,492
179,705 shares
mixed-class rows
|
— | 02 Jan 2026 |
| Ronen Tchelet |
3/4/5
VP of Research and Bus. Dvlpmt
|
—
mixed-class rows
|
$50,388
98,147 shares
mixed-class rows
|
— | 02 Jan 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$24,700.
Buys
$24,700
Insiders: 1
Sells
$0
Insiders: 0
Net
+$24,700
Shares: +26,000
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 26,000
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 26,000 | 0 | $24,700 | $0 | +$24,700 |
Reporting owners
Insider holders from Forms 3/4/5
Current reporting-owner rows connected to DYADIC INTERNATIONAL INC. Open the relationship link for the CIK-to-CIK filing trail.
Rows
11
Lead holder
Francisco Trust under agreement dated February 28, 1996
Net 12M change
+$24,700
Latest report
02 Jan 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Francisco Trust under agreement dated February 28, 1996 | 10%+ Owner | $4,896,969 | Mixed | 27 Jul 2021 | ||
| Mark A. Emalfarb | CEO, Director, 10%+ Owner | $4,784,340 | Mixed | 02 Jan 2026 | ||
| Michael P. Tarnok | Director | $358,933 | Mixed | 20 Jun 2025 | ||
| Seth Herbst | Director | $221,192 | Mixed | 02 Jan 2026 | ||
| Joseph P. Hazelton | President & COO | $189,840 | +$24,700 | +15% | Mixed | 02 Jan 2026 |
| Ping Wang Rawson | Chief Financial Officer | $168,449 | Mixed | 02 Jan 2026 | ||
| Barry Buckland | Director | $127,033 | Mixed | 11 Jun 2024 | ||
| Jack Kaye | Director | $101,293 | Mixed | 02 Jan 2026 | ||
| Arindam Bose | Director | $97,208 | Mixed | 20 Jun 2025 | ||
| Patrick K. Lucy | Director | $92,492 | Mixed | 02 Jan 2026 | ||
| Ronen Tchelet | VP of Research and Bus. Dvlpmt | $50,388 | Mixed | 02 Jan 2026 |
Recent Insider Transactions by Companies or Individuals for DYADIC INTERNATIONAL INC
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Ronen Tchelet | DYAI | Common Stock | Award | 55% | 18,064 | 50,897 | 02 Jan 2026 | Direct | ||
| Ronen Tchelet | DYAI | Stock Option | Award | 47,250 | 47,250 | 02 Jan 2026 | Direct | |||
| Ping Wang Rawson | DYAI | Common Stock | Award | 20.7% | 29,158 | 170,151 | 02 Jan 2026 | Direct | ||
| Ping Wang Rawson | DYAI | Stock Option | Award | 47,250 | 47,250 | 02 Jan 2026 | Direct | |||
| Patrick K. Lucy | DYAI | Common Stock | Options Exercise | 42.5% | 21,552 | 72,311 | 02 Jan 2026 | Direct | ||
| Patrick K. Lucy | DYAI | Restricted Stock Unit | Award | 39,894 | 39,894 | 02 Jan 2026 | Direct | |||
| Patrick K. Lucy | DYAI | Stock Option | Award | 67,500 | 67,500 | 02 Jan 2026 | Direct | |||
| Patrick K. Lucy | DYAI | Restricted Stock Unit | Options Exercise | -100% | -21,552 | 0 | 02 Jan 2026 | Direct | ||
| Jack Kaye | DYAI | Common Stock | Options Exercise | 36.1% | 21,552 | 81,201 | 02 Jan 2026 | Direct | ||
| Jack Kaye | DYAI | Restricted Stock Unit | Award | 39,894 | 39,894 | 02 Jan 2026 | Direct | |||
| Jack Kaye | DYAI | Stock Option | Award | 67,500 | 67,500 | 02 Jan 2026 | Direct | |||
| Jack Kaye | DYAI | Restricted Stock Unit | Options Exercise | -100% | -21,552 | 0 | 02 Jan 2026 | Direct | ||
| Seth Herbst | DYAI | Common Stock | Options Exercise | 11.9% | 21,552 | 202,311 | 02 Jan 2026 | Direct | ||
| Seth Herbst | DYAI | Restricted Stock Unit | Award | 39,894 | 39,894 | 02 Jan 2026 | Direct | |||
| Seth Herbst | DYAI | Stock Option | Award | 50,000 | 50,000 | 02 Jan 2026 | Direct | |||
| Seth Herbst | DYAI | Restricted Stock Unit | Options Exercise | -100% | -21,552 | 0 | 02 Jan 2026 | Direct | ||
| Joseph P. Hazelton | DYAI | Common Stock | Award | 23.4% | 36,418 | 191,758 | 02 Jan 2026 | Direct | ||
| Joseph P. Hazelton | DYAI | Stock Option | Award | 67,250 | 67,250 | 02 Jan 2026 | Direct | |||
| Mark A. Emalfarb | DYAI | Common Stock | Award | 2.17% | 102,609 | 4,832,667 | 02 Jan 2026 | Direct | ||
| Mark A. Emalfarb | DYAI | Stock Option | Award | 126,000 | 126,000 | 02 Jan 2026 | Direct | |||
| Mark A. Emalfarb | DYAI | Senior Secured Convertible Promissory Note due Dec 31, 2027 | Award | 0 | $1,000,000 | 23 Dec 2025 | Through Mark A Emalfarb Trust U/A/ DTD 10/1/1987 | |||
| Mark A. Emalfarb | DYAI | Senior Secured Convertible Promissory Note due March 8, 2027 | Disposed to Issuer | 0 | 0 | 23 Dec 2025 | Through Mark A Emalfarb Trust U/A/ DTD 10/1/1987 | |||
| Mark A. Emalfarb | DYAI | Senior Secured Convertible Promissory Note due March 8, 2027 | Purchase | 0 | $1,000,000 | 15 Sep 2025 | Through Mark A Emalfarb Trust U/A/ DTD 10/1/1987 | |||
| Joseph P. Hazelton | DYAI | Common Stock | Purchase | 20.1% | $24,700 | $0.9500 | 26,000 | 155,340 | 01 Aug 2025 | Direct |
| Michael P. Tarnok | DYAI | Common Stock | Options Exercise | 3.99% | 10,776 | 281,033 | 20 Jun 2025 | Direct | ||
| Michael P. Tarnok | DYAI | Restricted Stock Unit | Options Exercise | -100% | -10,776 | 0 | 20 Jun 2025 | Direct | ||
| Arindam Bose | DYAI | Common Stock | Options Exercise | 21.2% | 10,776 | 61,535 | 20 Jun 2025 | Direct | ||
| Arindam Bose | DYAI | Restricted Stock Unit | Disposed to Issuer | -100% | -10,776 | 0 | 20 Jun 2025 | Direct | ||
| Arindam Bose | DYAI | Restricted Stock Unit | Options Exercise | -100% | -10,776 | 0 | 20 Jun 2025 | Direct | ||
| Joseph P. Hazelton | DYAI | Stock Option | Award | 25,000 | 25,000 | 30 May 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.