Walter V. Klemp, CEO and President of Moleculin Biotech ($MBRX), bought shares on the open market once in the last year, totaling $250,000, with his most recent purchase on June 23, 2025. This ranks 1,344th among nearly 5,000 insiders by purchase value, below the average of $1.5 million across about 3.3 transactions. He reported no open market sales.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nov. 12, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | A | Performance Based Restricted Stock Units | 750000 | $0.00 | 3,960,731.0000 | 50,910,476 | 23.36% | 1.47% |
| Nov. 12, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | A | Stock option (right to buy) | 830000 | $0.00 | 3,210,731.0000 | 50,910,476 | 34.86% | 1.63% |
| Nov. 4, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Common Stock | 28750 | $0.00 | 772,357.0000 | 14,000,494 | 3.87% | 0.21% |
| Nov. 4, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Restricted Stock Units | 28750 | $0.00 | 2,380,731.0000 | 14,000,494 | 1.19% | 0.21% |
| Nov. 4, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | F | Common Stock | 7001 | $0.50 | 765,356.0000 | 14,000,494 | 0.91% | 0.05% |
| Aug. 11, 2025 | Autonomix Medical, Inc. | $AMIX | KLEMP WALTER V | Director | D | Option (Right to buy) | 8773 | $0.00 | 1,250.0000 | 1,766,425 | 87.53% | 0.50% |
| June 23, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | P | Common Stock | 675675 | $0.37 | 743,607.0000 | 14,000,494 | 994.63% | 4.83% |
| June 22, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Common Stock | 8990 | $0.00 | 70,122.0000 | 14,000,494 | 14.71% | 0.06% |
| June 22, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | F | Common Stock | 2190 | $0.27 | 67,932.0000 | 14,000,494 | 3.12% | 0.02% |
| June 23, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | P | Series E Warrants | 2027025 | $0.00 | 2,409,481.0000 | 14,000,494 | 45.69% | 14.48% |
| June 20, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Common Stock | 3750 | $0.00 | 62,046.0000 | 14,000,494 | 6.43% | 0.03% |
| June 20, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Restricted Stock Units | 3750 | $0.00 | 391,446.0000 | 14,000,494 | 0.95% | 0.03% |
| June 22, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Restricted Stock Units | 8990 | $0.00 | 382,456.0000 | 14,000,494 | 2.30% | 0.06% |
| June 20, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | F | Common Stock | 914 | $0.27 | 61,132.0000 | 14,000,494 | 1.47% | 0.01% |
| June 16, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Common Stock | 1667 | $0.00 | 58,702.0000 | 14,000,494 | 2.92% | 0.01% |
| June 16, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | F | Common Stock | 406 | $0.69 | 58,296.0000 | 14,000,494 | 0.69% | 0.00% |
| June 16, 2025 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Restricted Stock Units | 1667 | $0.00 | 370,075.0000 | 14,000,494 | 0.45% | 0.01% |
| Nov. 4, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | A | Stock option (right to buy) | 100000 | $0.00 | 213,152.0000 | 0 | 88.38% | 0.00% |
| Nov. 4, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | A | Restricted Stock Units | 115000 | $0.00 | 328,152.0000 | 0 | 53.95% | 0.00% |
| Oct. 25, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | A | Performance Based Restricted Stock Units | 43590 | $0.00 | 371,742.0000 | 0 | 13.28% | 0.00% |
| July 2, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Restricted Stock Units | 982 | $0.00 | 113,152.0000 | 0 | 0.86% | 0.00% |
| July 2, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Common Stock | 982 | $0.00 | 57,275.0000 | 0 | 1.74% | 0.00% |
| July 2, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | F | Common Stock | 240 | $3.57 | 57,035.0000 | 0 | 0.42% | 0.00% |
| June 22, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Restricted Stock Units | 8990 | $0.00 | 114,134.0000 | 0 | 7.30% | 0.00% |
| June 22, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Common Stock | 8990 | $0.00 | 58,483.0000 | 0 | 18.16% | 0.00% |
| June 22, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | F | Common Stock | 2190 | $3.74 | 56,293.0000 | 0 | 3.74% | 0.00% |
| June 21, 2024 | Autonomix Medical, Inc. | $AMIX | KLEMP WALTER V | Director | A | Option (Right to buy) | 175452 | $0.00 | 200,452.0000 | 14,626,282 | 701.81% | 1.20% |
| June 20, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Restricted Stock Units | 3750 | $0.00 | 123,124.0000 | 0 | 2.96% | 0.00% |
| June 20, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | F | Common Stock | 914 | $3.78 | 49,493.0000 | 0 | 1.81% | 0.00% |
| June 20, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Common Stock | 3750 | $0.00 | 50,407.0000 | 0 | 8.04% | 0.00% |
| June 16, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Restricted Stock Units | 1667 | $0.00 | 126,874.0000 | 0 | 1.30% | 0.00% |
| June 16, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | F | Common Stock | 406 | $4.14 | 46,657.0000 | 0 | 0.86% | 0.00% |
| June 16, 2024 | Moleculin Biotech, Inc. | $MBRX | KLEMP WALTER V | CEO and President | M | Common Stock | 1667 | $0.00 | 47,063.0000 | 0 | 3.67% | 0.00% |