MBRXMoleculin Biotech, Inc.
- Market cap
- $6.63M
- as of 2026-10-23
- Latest close
- $6.50
- as of 2026-10-23
- Sector
- Healthcare
- as of 2026-10-24
- Industry
- Biotechnology
- as of 2026-10-24
Cluster
No cluster in the last 90 days under the default rule (14d · ≥2 insiders · all roles).
Form 4 historysince 2023-12-27
| Insider | Traded | Filed | Type | Shares | Price | Value | Owned after | 10b5-1 plan | Filing |
|---|---|---|---|---|---|---|---|---|---|
| Picker Donald HChief Science Officer | Oct 15 | Oct 16 | A · derivative | 250,000 | $0.37 | $92,525 | 789,595 | No | Form 4 |
| Klemp Walter VCEO and President | Oct 15 | Oct 16 | M | 207,500 | not reported | not reported | 771,840 | No | Form 4 |
| Klemp Walter VCEO and President | Oct 15 | Oct 16 | F | 48,659 | $0.37 | $18,009 | 723,181 | No | Form 4 |
| Klemp Walter VCEO and President | Oct 15 | Oct 16 | A · derivative | 415,000 | $0.37 | $153,592 | 2,341,335 | No | Form 4 |
| Klemp Walter VCEO and President | Oct 15 | Oct 16 | A · derivative | 415,000 | not reported | not reported | 2,756,335 | No | Form 4 |
| Klemp Walter VCEO and President | Oct 15 | Oct 16 | M · derivative | 207,500 | $0.00 | $0 | 2,548,335 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Oct 15 | Oct 16 | M | 130,000 | not reported | not reported | 435,673 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Oct 15 | Oct 16 | F | 30,485 | $0.37 | $11,283 | 405,188 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Oct 15 | Oct 16 | A · derivative | 260,000 | $0.37 | $96,226 | 1,287,717 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Oct 15 | Oct 16 | A · derivative | 260,000 | not reported | not reported | 1,547,717 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Oct 15 | Oct 16 | M · derivative | 130,000 | $0.00 | $0 | 1,417,717 | No | Form 4 |
| Picker Donald HChief Science Officer | Aug 3 | Aug 5 | P | 173,333 | not reported | Purchase not reported | 174,086 | No | Form 4 |
| Picker Donald HChief Science Officer | Aug 3 | Aug 5 | P · derivative | 519,999 | not reported | Purchase not reported | 539,595 | No | Form 4 |
| Klemp Walter VCEO and President | Aug 3 | Aug 5 | P | 533,333 | not reported | Purchase not reported | 564,340 | No | Form 4 |
| Klemp Walter VCEO and President | Aug 3 | Aug 5 | A · derivative | 1,599,999 | not reported | not reported | 1,926,335 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Aug 3 | Aug 5 | P | 293,333 | not reported | Purchase not reported | 305,673 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Aug 3 | Aug 5 | P · derivative | 879,999 | not reported | Purchase not reported | 1,027,717 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 22 | Jun 24 | M | 174 | not reported | not reported | 12,381 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 22 | Jun 24 | F | 41 | $3.12 | $128 | 12,340 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 22 | Jun 24 | M · derivative | 174 | $0.00 | $0 | 147,718 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 22 | Jun 24 | M | 360 | not reported | not reported | 31,088 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 22 | Jun 24 | F | 88 | $3.12 | $275 | 31,007 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 22 | Jun 24 | M · derivative | 360 | $0.00 | $0 | 326,336 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 22 | Jun 24 | M | 71 | not reported | not reported | 774 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 22 | Jun 24 | F | 21 | $3.12 | $66 | 753 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 22 | Jun 24 | M · derivative | 71 | $0.00 | $0 | 19,596 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 20 | Jun 24 | M | 109 | not reported | not reported | 12,238 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 20 | Jun 24 | F | 31 | $2.88 | $89 | 12,207 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 20 | Jun 24 | M · derivative | 109 | $0.00 | $0 | 147,892 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 20 | Jun 24 | M | 150 | not reported | not reported | 30,765 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 20 | Jun 24 | F | 37 | $2.88 | $107 | 30,728 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 20 | Jun 24 | M · derivative | 150 | $0.00 | $0 | 326,696 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 20 | Jun 24 | M | 44 | not reported | not reported | 716 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 20 | Jun 24 | F | 13 | $2.88 | $37 | 703 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 20 | Jun 24 | M · derivative | 44 | $0.00 | $0 | 19,667 | No | Form 4 |
| George Robert E. | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 150,000 | $0.49 | $73,500 | 165,336 | No | Form 4 |
| Climaco John M | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 150,000 | $0.49 | $73,500 | 165,169 | No | Form 4 |
| Cannon Michael D | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 150,000 | $0.49 | $73,500 | 165,336 | No | Form 4 |
| Cermak Elizabeth | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 150,000 | $0.49 | $73,500 | 164,668 | No | Form 4 |
| Yan Joy | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 150,000 | $0.49 | $73,500 | 164,001 | No | Form 4 |
| Klemp Walter VCEO and President | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 830,000 | $0.49 | $406,700 | 3,210,731 | No | Form 4 |
| Klemp Walter VCEO and President | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 750,000 | not reported | not reported | 3,960,731 | No | Form 4 |
| Foster Jonathan P.EVP & CFO | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 600,000 | $0.49 | $294,000 | 1,617,695 | No | Form 4 |
| Foster Jonathan P.EVP & CFO | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 400,000 | not reported | not reported | 2,017,695 | No | Form 4 |
| Picker Donald HCSO | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 200,000 | $0.49 | $98,000 | 295,508 | No | Form 4 |
| Picker Donald HCSO | Nov 12, 2025 | Nov 14, 2025 | A · derivative | 200,000 | not reported | not reported | 495,508 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Nov 4, 2025 | Nov 6, 2025 | M | 20,625 | not reported | not reported | 308,212 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Nov 4, 2025 | Nov 6, 2025 | M | 5,023 | $0.50 | $2,512 | 303,189 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Nov 4, 2025 | Nov 6, 2025 | M · derivative | 20,625 | $0.00 | $0 | 1,017,695 | No | Form 4 |
| Klemp Walter VCEO and President | Nov 4, 2025 | Nov 6, 2025 | M | 28,750 | not reported | not reported | 772,357 | No | Form 4 |
| Klemp Walter VCEO and President | Nov 4, 2025 | Nov 6, 2025 | F | 7,001 | $0.50 | $3,501 | 765,356 | No | Form 4 |
| Klemp Walter VCEO and President | Nov 4, 2025 | Nov 6, 2025 | M · derivative | 28,750 | $0.00 | $0 | 2,380,731 | No | Form 4 |
| Picker Donald HChief Science Officer | Nov 4, 2025 | Nov 6, 2025 | M | 8,750 | not reported | not reported | 18,902 | No | Form 4 |
| Picker Donald HChief Science Officer | Nov 4, 2025 | Nov 6, 2025 | F | 2,131 | $0.50 | $1,066 | 16,771 | No | Form 4 |
| Picker Donald HChief Science Officer | Nov 4, 2025 | Nov 6, 2025 | M · derivative | 8,750 | $0.00 | $0 | 95,508 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 23, 2025 | Jun 23, 2025 | P | 675,675 | $0.37 | Purchase +$250,000 | 743,607 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 23, 2025 | Jun 23, 2025 | P · derivative | 2,027,025 | $0.37 | Purchase +$749,999 | 2,409,481 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 23, 2025 | Jun 23, 2025 | P | 270,270 | $0.37 | Purchase +$100,000 | 287,587 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 23, 2025 | Jun 23, 2025 | P · derivative | 810,810 | $0.37 | Purchase +$300,000 | 1,038,320 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 22, 2025 | Jun 23, 2025 | M | 1,766 | not reported | not reported | 10,582 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 22, 2025 | Jun 23, 2025 | F | 430 | $0.27 | $116 | 10,152 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 22, 2025 | Jun 23, 2025 | M · derivative | 1,766 | $0.00 | $0 | 104,258 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 22, 2025 | Jun 23, 2025 | M | 8,990 | not reported | not reported | 70,122 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 22, 2025 | Jun 23, 2025 | F | 2,190 | $0.27 | $591 | 67,932 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 22, 2025 | Jun 23, 2025 | M · derivative | 8,990 | $0.00 | $0 | 382,456 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 22, 2025 | Jun 23, 2025 | M | 4,328 | not reported | not reported | 18,371 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 22, 2025 | Jun 23, 2025 | F | 1,054 | $0.27 | $285 | 17,317 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 22, 2025 | Jun 23, 2025 | M · derivative | 4,328 | $0.00 | $0 | 227,510 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 20, 2025 | Jun 23, 2025 | M | 1,078 | not reported | not reported | 9,079 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 20, 2025 | Jun 23, 2025 | F | 263 | $0.27 | $71 | 8,816 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 20, 2025 | Jun 23, 2025 | M · derivative | 1,078 | $0.00 | $0 | 106,024 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 20, 2025 | Jun 23, 2025 | M | 3,750 | not reported | not reported | 62,046 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 20, 2025 | Jun 23, 2025 | F | 914 | $0.27 | $247 | 61,132 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 20, 2025 | Jun 23, 2025 | M · derivative | 3,750 | $0.00 | $0 | 391,446 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 20, 2025 | Jun 23, 2025 | M | 2,711 | not reported | not reported | 14,704 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 20, 2025 | Jun 23, 2025 | F | 661 | $0.27 | $178 | 14,043 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 20, 2025 | Jun 23, 2025 | M · derivative | 2,711 | $0.00 | $0 | 231,838 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 16, 2025 | Jun 18, 2025 | M | 1,667 | not reported | not reported | 58,702 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 16, 2025 | Jun 18, 2025 | F | 406 | $0.69 | $280 | 58,296 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 16, 2025 | Jun 18, 2025 | M · derivative | 1,667 | $0.00 | $0 | 370,075 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 16, 2025 | Jun 18, 2025 | M | 833 | not reported | not reported | 12,196 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 16, 2025 | Jun 18, 2025 | F | 203 | $0.69 | $140 | 11,993 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 16, 2025 | Jun 18, 2025 | M · derivative | 833 | $0.00 | $0 | 230,684 | No | Form 4 |
| Klemp Walter VCEO and President | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 100,000 | $2.45 | $245,000 | 213,152 | No | Form 4 |
| Klemp Walter VCEO and President | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 115,000 | not reported | not reported | 328,152 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 65,000 | $2.45 | $159,250 | 129,837 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 82,500 | not reported | not reported | 212,337 | No | Form 4 |
| Picker Donald HChief Science Officer | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 40,000 | $2.45 | $98,000 | 66,358 | No | Form 4 |
| Picker Donald HChief Science Officer | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 35,000 | not reported | not reported | 101,358 | No | Form 4 |
| Cannon Michael D | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 10,000 | $2.45 | $24,500 | 15,336 | No | Form 4 |
| George Robert E. | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 10,000 | $2.45 | $24,500 | 15,336 | No | Form 4 |
| Climaco John M | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 10,000 | $2.45 | $24,500 | 15,169 | No | Form 4 |
| Cermak Elizabeth | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 10,000 | $2.45 | $24,500 | 14,668 | No | Form 4 |
| Yan Joy | Nov 4, 2024 | Nov 6, 2024 | A · derivative | 10,000 | $2.45 | $24,500 | 14,001 | No | Form 4 |
| Klemp Walter VCEO and President | Oct 25, 2024 | Nov 6, 2024 | A · derivative | 43,590 | not reported | not reported | 371,742 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Oct 25, 2024 | Nov 6, 2024 | A · derivative | 19,180 | not reported | not reported | 231,517 | No | Form 4 |
| Picker Donald HChief Science Officer | Oct 25, 2024 | Nov 6, 2024 | A · derivative | 5,744 | not reported | not reported | 107,102 | No | Form 4 |
| Klemp Walter VCEO and President | Jul 2, 2024 | Jul 5, 2024 | M | 982 | not reported | not reported | 57,275 | No | Form 4 |
| Klemp Walter VCEO and President | Jul 2, 2024 | Jul 5, 2024 | F | 240 | $3.57 | $857 | 57,035 | No | Form 4 |
| Klemp Walter VCEO and President | Jul 2, 2024 | Jul 5, 2024 | M · derivative | 982 | $0.00 | $0 | 113,152 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 22, 2024 | Jun 25, 2024 | M | 8,990 | not reported | not reported | 58,483 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 22, 2024 | Jun 25, 2024 | F | 2,190 | $3.74 | $8,191 | 56,293 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 22, 2024 | Jun 25, 2024 | M · derivative | 8,990 | $0.00 | $0 | 114,134 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 22, 2024 | Jun 25, 2024 | M | 4,329 | not reported | not reported | 12,416 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 22, 2024 | Jun 25, 2024 | F | 1,053 | $3.74 | $3,938 | 11,363 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 22, 2024 | Jun 25, 2024 | M · derivative | 4,329 | $0.00 | $0 | 64,837 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 22, 2024 | Jun 25, 2024 | M | 1,766 | not reported | not reported | 8,525 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 22, 2024 | Jun 25, 2024 | F | 524 | $3.74 | $1,960 | 8,001 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 22, 2024 | Jun 25, 2024 | M · derivative | 1,766 | $0.00 | $0 | 26,358 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 20, 2024 | Jun 21, 2024 | M | 3,750 | not reported | not reported | 50,407 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 20, 2024 | Jun 21, 2024 | F | 914 | $3.78 | $3,455 | 49,493 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 20, 2024 | Jun 21, 2024 | M · derivative | 3,750 | $0.00 | $0 | 123,124 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 20, 2024 | Jun 21, 2024 | M | 2,712 | not reported | not reported | 8,723 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 20, 2024 | Jun 21, 2024 | F | 636 | $3.78 | $2,404 | 8,087 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 20, 2024 | Jun 21, 2024 | M · derivative | 2,712 | $0.00 | $0 | 69,166 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 20, 2024 | Jun 21, 2024 | M | 1,078 | not reported | not reported | 7,079 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 20, 2024 | Jun 21, 2024 | F | 320 | $3.78 | $1,210 | 6,759 | No | Form 4 |
| Picker Donald HChief Science Officer | Jun 20, 2024 | Jun 21, 2024 | M · derivative | 1,078 | $0.00 | $0 | 28,124 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 16, 2024 | Jun 18, 2024 | M | 1,667 | not reported | not reported | 47,063 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 16, 2024 | Jun 18, 2024 | F | 406 | $4.14 | $1,681 | 46,657 | No | Form 4 |
| Klemp Walter VCEO and President | Jun 16, 2024 | Jun 18, 2024 | M · derivative | 1,667 | $0.00 | $0 | 126,874 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 16, 2024 | Jun 18, 2024 | M | 834 | not reported | not reported | 6,207 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 16, 2024 | Jun 18, 2024 | F | 196 | $4.14 | $811 | 6,011 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Jun 16, 2024 | Jun 18, 2024 | M · derivative | 834 | $0.00 | $0 | 71,878 | No | Form 4 |
| Klemp Walter VCEO and President | Dec 26, 2023 | Dec 27, 2023 | P | 188,404 | $0.69 | Purchase +$129,999 | 680,880 | No | Form 4 |
| George Robert E. | Dec 26, 2023 | Dec 27, 2023 | P | 14,493 | $0.69 | Purchase +$10,000 | 14,660 | No | Form 4 |
| Foster Jonathan P.Chief Financial Officer | Dec 26, 2023 | Dec 27, 2023 | P | 28,986 | $0.69 | Purchase +$20,000 | 80,556 | No | Form 4 |