Form 4 for MBRX Moleculin Biotech, Inc.
Accepted 2026-06-24 21:00:45 ET · period of report 2026-06-20 · accession 0001437749-26-021611 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DM | 2026-06-24 21:00 | 2026-06-20+ | MBRX | KLEMP WALTER V | CEO, Pres, Dir | M - OptEx | — | +510 | 31.1K | +2% | — |
| DM | 2026-06-24 21:00 | 2026-06-20+ | MBRX | KLEMP WALTER V | CEO, Pres, Dir | F - Tax | $3.05 | -125 | 31.0K | -0.4% | -$381.12 |
| DM | 2026-06-24 21:00 | 2026-06-20+ | MBRX | KLEMP WALTER V | CEO, Pres, Dir | M - OptEx | $0.00 | -510 | 326.3K | -0.2% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-06-20 | M | A | 150 | — | 30,765 | D | — | — | (F1) Restricted stock units convert into common stock on a one-for-one basis. |
| 2 | Common | Common Stock | 2026-06-20 | F | D | 37 | $2.88 | 30,728 | D | — | — | (F2) Shares withheld for payment of taxes upon vesting of restricted stock unit awards. |
| 3 | Common | Common Stock | 2026-06-22 | M | A | 360 | — | 31,088 | D | — | — | (F1) Restricted stock units convert into common stock on a one-for-one basis. |
| 4 | Common | Common Stock | 2026-06-22 | F | D | 88 | $3.12 | 31,007 | D | — | — | (F2) Shares withheld for payment of taxes upon vesting of restricted stock unit awards. |
| 5 | Derivative | Restricted Stock Units | 2026-06-20 | M | D | 150 | $0.00 | 326,696 | D | — · — to — | 150 Common Stock | (F1) Restricted stock units convert into common stock on a one-for-one basis. (F3) On June 20, 2022, the reporting person was granted 600 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date. (F3) On June 20, 2022, the reporting person was granted 600 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date. (F5) Includes 250,002 shares of common stock underlying Series E warrants to purchase common stock. |
| 6 | Derivative | Restricted Stock Units | 2026-06-22 | M | D | 360 | $0.00 | 326,336 | D | — · — to — | 360 Common Stock | (F1) Restricted stock units convert into common stock on a one-for-one basis. (F4) On June 22, 2023, the reporting person was granted 1,439 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date. (F4) On June 22, 2023, the reporting person was granted 1,439 restricted stock units, vesting in four equal annual installments beginning on the first anniversary of the grant date. (F5) Includes 250,002 shares of common stock underlying Series E warrants to purchase common stock. |