Moleculin Biotech, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| PICKER DONALD H | Chief Science Officer | Option Exercise | 8,750 | — | — | 18,902 | Nov 4, 2025 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 7,001 | $0.50 | $3,501 | 765,356 | Nov 4, 2025 |
| Foster Jonathan P. | Chief Financial Officer | Option Exercise | 5,023 | $0.50 | $2,512 | 303,189 | Nov 4, 2025 |
| Foster Jonathan P. | Chief Financial Officer | Purchase | 270,270 | $0.37 | $100,000 | 287,587 | Jun 20, 2025 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 914 | $0.27 | $247 | 61,132 | Jun 20, 2025 |
| PICKER DONALD H | Chief Science Officer | Tax Withholding | 263 | $0.27 | $71 | 8,816 | Jun 20, 2025 |
| Foster Jonathan P. | Chief Financial Officer | Option Exercise | 833 | — | — | 12,196 | Jun 16, 2025 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 406 | $0.69 | $280 | 58,296 | Jun 16, 2025 |
| KLEMP WALTER V | CEO and President | Option Exercise | 982 | — | — | 57,275 | Jul 2, 2024 |
| PICKER DONALD H | Chief Science Officer | Tax Withholding | 524 | $3.74 | $1,960 | 8,001 | Jun 22, 2024 |
| Foster Jonathan P. | Chief Financial Officer | Option Exercise | 4,329 | — | — | 12,416 | Jun 22, 2024 |
| KLEMP WALTER V | CEO and President | Option Exercise | 8,990 | — | — | 58,483 | Jun 22, 2024 |
| PICKER DONALD H | Chief Science Officer | Tax Withholding | 320 | $3.78 | $1,210 | 6,759 | Jun 20, 2024 |
| Foster Jonathan P. | Chief Financial Officer | Tax Withholding | 636 | $3.78 | $2,404 | 8,087 | Jun 20, 2024 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 914 | $3.78 | $3,455 | 49,493 | Jun 20, 2024 |
| Foster Jonathan P. | Chief Financial Officer | Tax Withholding | 196 | $4.14 | $811 | 6,011 | Jun 16, 2024 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 406 | $4.14 | $1,681 | 46,657 | Jun 16, 2024 |
| Foster Jonathan P. | Chief Financial Officer | Purchase | 28,986 | $0.69 | $20,000 | 80,556 | Dec 26, 2023 |
| George Robert E. | — | Purchase | 14,493 | $0.69 | $10,000 | 14,660 | Dec 26, 2023 |
| KLEMP WALTER V | CEO and President | Purchase | 188,404 | $0.69 | $129,999 | 680,880 | Dec 26, 2023 |
| KLEMP WALTER V | CEO and President | Option Exercise | 13,204 | — | — | 495,692 | Jul 11, 2023 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 3,584 | $0.58 | $2,079 | 482,488 | Jul 2, 2023 |
| PICKER DONALD H | Chief Science Officer | Option Exercise | 16,167 | — | — | 94,273 | Jun 20, 2023 |
| Foster Jonathan P. | Chief Financial Officer | Tax Withholding | 9,676 | $0.57 | $5,515 | 51,570 | Jun 20, 2023 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 13,697 | $0.57 | $7,807 | 471,355 | Jun 20, 2023 |
| Foster Jonathan P. | Chief Financial Officer | Tax Withholding | 3,044 | $0.57 | $1,735 | 20,579 | Jun 16, 2023 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 6,088 | $0.57 | $3,470 | 428,802 | Jun 16, 2023 |
| KLEMP WALTER V | CEO and President | Purchase | 45,000 | $1.28 | $57,600 | 409,890 | Nov 25, 2022 |
| KLEMP WALTER V | CEO and President | Purchase | 22,500 | $1.15 | $25,875 | 364,890 | Nov 21, 2022 |
| KLEMP WALTER V | CEO and President | Purchase | 85,213 | $0.97 | $82,657 | 317,648 | Nov 17, 2022 |
| KLEMP WALTER V | CEO and President | Option Exercise | 13,204 | — | — | 235,650 | Jul 11, 2022 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 3,215 | $1.68 | $5,401 | 232,435 | Jul 11, 2022 |
| KLEMP WALTER V | CEO and President | Option Exercise | 14,717 | — | — | 226,030 | Jul 2, 2022 |
| KLEMP WALTER V | CEO and President | Option Exercise | 14,717 | — | — | 226,030 | Jul 2, 2022 |
| KLEMP WALTER V | CEO and President | Option Exercise | 25,000 | — | — | 217,401 | Jun 16, 2022 |
| Foster Jonathan P. | Chief Financial Officer | Option Exercise | 12,500 | — | — | 14,167 | Jun 16, 2022 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 3,215 | $3.56 | $11,445 | 192,401 | Jul 11, 2021 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 3,584 | $3.56 | $12,759 | 182,411 | Jul 2, 2021 |
| KLEMP WALTER V | CEO and President | Tax Withholding | 19,292 | $0.86 | $16,591 | 1,027,659 | Jul 13, 2020 |
| Priebe Waldemar | — | Sale | 100,000 | $1.70 | $170,000 | 2,781,573 | Aug 16, 2017 |
| KLEMP WALTER V | Chief Executive Officer | Sale | 100,000 | $1.70 | $170,000 | 967,724 | Aug 16, 2017 |
| KLEMP WALTER V | Chief Executive Officer | Purchase | 12,000 | $0.81 | $9,720 | 1,067,724 | May 11, 2017 |
| Northcut Jacqueline | — | Purchase | 1,000 | $0.82 | $820 | 1,000 | May 5, 2017 |
| George Robert E. | — | Purchase | 1,000 | $0.94 | $940 | 1,000 | Apr 28, 2017 |
| Foster Jonathan P. | Exec. Vice President & CFO | Purchase | 10,000 | $0.86 | $8,600 | 10,000 | Apr 25, 2017 |