Walter V Klemp
Insider
First SEC filing: Jan. 26, 2024 · Latest: Jan. 26, 2024
Insider at
Insider transactions
1 buys (P)
0 sells (S)
Net: $0
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Sept. 3, 2026 | AMIX | A | 13,000 | · | · | 20,118 Direct | +182.64% | Acquired | (price as of 2026-10-05) |
| Aug. 3, 2026 | MBRX | P | 533,333 | · | · | 564,340 Direct | +1720.04% | Acquired | (price as of 2026-10-05) |
| Aug. 3, 2026 | MBRX | A | 1,599,999 | · | · | 1,926,335 Direct | +490.29% | Acquired | (price as of 2026-10-05) |
| June 22, 2026 | MBRX | M | 360 | · | · | 326,336 Direct | -0.11% | Disposed | (price as of 2026-10-05) |
| June 22, 2026 | MBRX | F | 88 | $3.12 | $275 | 31,007 Direct | -0.28% | Disposed | -84.7% (price as of 2026-10-05) |
| June 22, 2026 | MBRX | M | 360 | · | · | 31,088 Direct | +1.17% | Acquired | (price as of 2026-10-05) |
| June 20, 2026 | MBRX | M | 150 | · | · | 326,696 Direct | -0.05% | Disposed | (price as of 2026-10-05) |
| June 20, 2026 | MBRX | F | 37 | $2.88 | $107 | 30,728 Direct | -0.12% | Disposed | -83.5% (price as of 2026-10-05) |
| June 20, 2026 | MBRX | M | 150 | · | · | 30,765 Direct | +0.49% | Acquired | (price as of 2026-10-05) |
| Nov. 12, 2025 | MBRX | A | 830,000 | · | · | 3,210,731 Direct | +34.86% | Acquired | (price as of 2026-10-05) |
| Nov. 12, 2025 | MBRX | A | 750,000 | · | · | 3,960,731 Direct | +23.36% | Acquired | (price as of 2026-10-05) |
| Nov. 4, 2025 | MBRX | M | 28,750 | · | · | 772,357 Direct | +3.87% | Acquired | (price as of 2026-10-05) |
| Nov. 4, 2025 | MBRX | F | 7,001 | $0.50 | $3,500 | 765,356 Direct | -0.91% | Disposed | -96.2% (price as of 2026-10-05) |
| Nov. 4, 2025 | MBRX | M | 28,750 | · | · | 2,380,731 Direct | -1.19% | Disposed | (price as of 2026-10-05) |
| Aug. 11, 2025 | AMIX | D | 8,773 | · | · | 1,250 Direct | -87.53% | Disposed | (price as of 2026-10-05) |
| June 23, 2025 | MBRX | P | 675,675 | $0.37 | $250,000 | 743,607 Direct | +994.63% | Acquired | -94.8% (price as of 2026-10-05) |
| June 23, 2025 | MBRX | P | 2,027,025 | · | · | 2,409,481 Direct | -45.69% | Disposed | (price as of 2026-10-05) |
| June 22, 2025 | MBRX | M | 8,990 | · | · | 70,122 Direct | +14.71% | Acquired | (price as of 2026-10-05) |
| June 22, 2025 | MBRX | F | 2,190 | $0.27 | $591 | 67,932 Direct | -3.12% | Disposed | -92.9% (price as of 2026-10-05) |
| June 22, 2025 | MBRX | M | 8,990 | · | · | 382,456 Direct | -2.30% | Disposed | (price as of 2026-10-05) |
| June 20, 2025 | MBRX | M | 3,750 | · | · | 62,046 Direct | +6.43% | Acquired | (price as of 2026-10-05) |
| June 20, 2025 | MBRX | F | 914 | $0.27 | $247 | 61,132 Direct | -1.47% | Disposed | -92.9% (price as of 2026-10-05) |
| June 20, 2025 | MBRX | M | 3,750 | · | · | 391,446 Direct | -0.95% | Disposed | (price as of 2026-10-05) |
| June 16, 2025 | MBRX | M | 1,667 | · | · | 58,702 Direct | +2.92% | Acquired | (price as of 2026-10-05) |
| June 16, 2025 | MBRX | F | 406 | $0.69 | $280 | 58,296 Direct | -0.69% | Disposed | -97.2% (price as of 2026-10-05) |
| June 16, 2025 | MBRX | M | 1,667 | · | · | 370,075 Direct | -0.45% | Disposed | (price as of 2026-10-05) |
| Nov. 4, 2024 | MBRX | A | 100,000 | · | · | 213,152 Direct | +88.38% | Acquired | (price as of 2026-10-05) |
| Nov. 4, 2024 | MBRX | A | 115,000 | · | · | 328,152 Direct | +53.95% | Acquired | (price as of 2026-10-05) |
| Oct. 25, 2024 | MBRX | A | 43,590 | · | · | 371,742 Direct | +13.28% | Acquired | (price as of 2026-10-05) |
| July 2, 2024 | MBRX | M | 982 | · | · | 57,275 Direct | +1.74% | Acquired | (price as of 2026-10-05) |
| July 2, 2024 | MBRX | F | 240 | $3.57 | $857 | 57,035 Direct | -0.42% | Disposed | -99.5% (price as of 2026-10-05) |
| July 2, 2024 | MBRX | M | 982 | · | · | 113,152 Direct | -0.86% | Disposed | (price as of 2026-10-05) |
| June 22, 2024 | MBRX | M | 8,990 | · | · | 58,483 Direct | +18.16% | Acquired | (price as of 2026-10-05) |
| June 22, 2024 | MBRX | F | 2,190 | $3.74 | $8,191 | 56,293 Direct | -3.74% | Disposed | -99.5% (price as of 2026-10-05) |
| June 22, 2024 | MBRX | M | 8,990 | · | · | 114,134 Direct | -7.30% | Disposed | (price as of 2026-10-05) |
| June 21, 2024 | AMIX | A | 175,452 | · | · | 200,452 Direct | +701.81% | Acquired | (price as of 2026-10-05) |
| June 20, 2024 | MBRX | M | 3,750 | · | · | 50,407 Direct | +8.04% | Acquired | (price as of 2026-10-05) |
| June 20, 2024 | MBRX | F | 914 | $3.78 | $3,455 | 49,493 Direct | -1.81% | Disposed | -99.5% (price as of 2026-10-05) |
| June 20, 2024 | MBRX | M | 3,750 | · | · | 123,124 Direct | -2.96% | Disposed | (price as of 2026-10-05) |
| June 16, 2024 | MBRX | M | 1,667 | · | · | 47,063 Direct | +3.67% | Acquired | (price as of 2026-10-05) |
| June 16, 2024 | MBRX | F | 406 | $4.14 | $1,681 | 46,657 Direct | -0.86% | Disposed | -99.5% (price as of 2026-10-05) |
| June 16, 2024 | MBRX | M | 1,667 | · | · | 126,874 Direct | -1.30% | Disposed | (price as of 2026-10-05) |
| Dec. 26, 2023 | MBRX | P | 188,404 | $0.69 | $129,999 | 680,880 Direct | +38.26% | Acquired | -99.8% (price as of 2026-10-05) |
| July 11, 2023 | MBRX | M | 13,204 | · | · | 495,692 Direct | +2.74% | Acquired | (price as of 2026-10-05) |
| July 11, 2023 | MBRX | F | 3,216 | $0.59 | $1,897 | 492,476 Direct | -0.65% | Disposed | -99.8% (price as of 2026-10-05) |
| July 11, 2023 | MBRX | M | 13,204 | · | · | 1,928,145 Direct | -0.68% | Disposed | (price as of 2026-10-05) |
| July 2, 2023 | MBRX | M | 14,717 | · | · | 486,072 Direct | +3.12% | Acquired | (price as of 2026-10-05) |
| July 2, 2023 | MBRX | F | 3,584 | $0.58 | $2,079 | 482,488 Direct | -0.74% | Disposed | -99.8% (price as of 2026-10-05) |
| July 2, 2023 | MBRX | M | 14,717 | · | · | 1,941,349 Direct | -0.75% | Disposed | (price as of 2026-10-05) |
| June 22, 2023 | MBRX | A | 400,000 | · | · | 1,416,691 Direct | +39.34% | Acquired | (price as of 2026-10-05) |
| June 22, 2023 | MBRX | A | 539,375 | · | · | 1,956,066 Direct | +38.07% | Acquired | (price as of 2026-10-05) |
| June 20, 2023 | MBRX | M | 56,250 | · | · | 485,052 Direct | +13.12% | Acquired | (price as of 2026-10-05) |
| June 20, 2023 | MBRX | F | 13,697 | $0.57 | $7,807 | 471,355 Direct | -2.82% | Disposed | -99.8% (price as of 2026-10-05) |
| June 20, 2023 | MBRX | M | 56,250 | · | · | 1,016,691 Direct | -5.24% | Disposed | (price as of 2026-10-05) |
| June 16, 2023 | MBRX | M | 25,000 | · | · | 434,890 Direct | +6.10% | Acquired | (price as of 2026-10-05) |
| June 16, 2023 | MBRX | F | 6,088 | $0.57 | $3,470 | 428,802 Direct | -1.40% | Disposed | -99.8% (price as of 2026-10-05) |
| June 16, 2023 | MBRX | M | 25,000 | · | · | 1,072,941 Direct | -2.28% | Disposed | (price as of 2026-10-05) |
| Nov. 25, 2022 | MBRX | P | 45,000 | $1.28 | $57,600 | 409,890 Direct | +12.33% | Acquired | -99.9% (price as of 2026-10-05) |
| Nov. 21, 2022 | MBRX | P | 22,500 | $1.15 | $25,875 | 364,890 Direct | +6.57% | Acquired | -99.9% (price as of 2026-10-05) |
| Nov. 17, 2022 | MBRX | P | 24,742 | $1.02 | $25,237 | 342,390 Direct | +7.79% | Acquired | -99.9% (price as of 2026-10-05) |
| Nov. 16, 2022 | MBRX | P | 85,213 | $0.97 | $82,657 | 317,648 Direct | +36.66% | Acquired | -99.9% (price as of 2026-10-05) |
| July 11, 2022 | MBRX | M | 13,204 | · | · | 235,650 Direct | +5.94% | Acquired | (price as of 2026-10-05) |
| July 11, 2022 | MBRX | F | 3,215 | $1.68 | $5,401 | 232,435 Direct | -1.36% | Disposed | -99.9% (price as of 2026-10-05) |
| July 11, 2022 | MBRX | M | 13,205 | · | · | 1,097,941 Direct | -1.19% | Disposed | (price as of 2026-10-05) |
| July 11, 2022 | MBRX | M | 13,204 | · | · | 235,650 Direct | +5.94% | Acquired | (price as of 2026-10-05) |
| July 11, 2022 | MBRX | F | 3,215 | $1.68 | $5,401 | 232,435 Direct | -1.36% | Disposed | -99.9% (price as of 2026-10-05) |
| July 11, 2022 | MBRX | M | 13,205 | · | · | 1,369,941 Direct | -0.95% | Disposed | (price as of 2026-10-05) |
| July 2, 2022 | MBRX | M | 14,717 | · | · | 226,030 Direct | +6.96% | Acquired | (price as of 2026-10-05) |
| July 2, 2022 | MBRX | F | 3,584 | $1.47 | $5,268 | 222,446 Direct | -1.59% | Disposed | -99.9% (price as of 2026-10-05) |
| July 2, 2022 | MBRX | M | 14,717 | · | · | 1,111,145 Direct | -1.31% | Disposed | (price as of 2026-10-05) |
| July 2, 2022 | MBRX | M | 14,717 | · | · | 226,030 Direct | +6.96% | Acquired | (price as of 2026-10-05) |
| July 2, 2022 | MBRX | F | 3,584 | $1.47 | $5,268 | 222,446 Direct | -1.59% | Disposed | -99.9% (price as of 2026-10-05) |
| July 2, 2022 | MBRX | M | 14,717 | · | · | 1,383,145 Direct | -1.05% | Disposed | (price as of 2026-10-05) |
| June 20, 2022 | MBRX | A | 225,000 | · | · | 900,862 Direct | +33.29% | Acquired | (price as of 2026-10-05) |
| June 20, 2022 | MBRX | A | 225,000 | · | · | 1,125,862 Direct | +24.98% | Acquired | (price as of 2026-10-05) |
| June 20, 2022 | MBRX | A | 360,000 | · | · | 1,035,862 Direct | +53.27% | Acquired | (price as of 2026-10-05) |
| June 20, 2022 | MBRX | A | 362,000 | · | · | 1,397,862 Direct | +34.95% | Acquired | (price as of 2026-10-05) |
| June 16, 2022 | MBRX | M | 25,000 | · | · | 217,401 Direct | +12.99% | Acquired | (price as of 2026-10-05) |
| June 16, 2022 | MBRX | F | 6,088 | $1.33 | $8,097 | 211,313 Direct | -2.80% | Disposed | -99.9% (price as of 2026-10-05) |
| June 16, 2022 | MBRX | M | 25,000 | · | · | 675,862 Direct | -3.57% | Disposed | (price as of 2026-10-05) |
| July 11, 2021 | MBRX | M | 13,205 | · | · | 195,616 Direct | +7.24% | Acquired | (price as of 2026-10-05) |
| July 11, 2021 | MBRX | F | 3,215 | $3.56 | $11,445 | 192,401 Direct | -1.64% | Disposed | -100.0% (price as of 2026-10-05) |
| July 11, 2021 | MBRX | M | 13,205 | · | · | 700,862 Direct | -1.85% | Disposed | (price as of 2026-10-05) |
| July 2, 2021 | MBRX | M | 14,718 | · | · | 185,995 Direct | +8.59% | Acquired | (price as of 2026-10-05) |
| July 2, 2021 | MBRX | F | 3,584 | $3.56 | $12,759 | 182,411 Direct | -1.93% | Disposed | -100.0% (price as of 2026-10-05) |
| July 2, 2021 | MBRX | M | 14,718 | · | · | 717,651 Direct | -2.01% | Disposed | (price as of 2026-10-05) |
| June 16, 2021 | MBRX | A | 223,635 | · | · | 628,785 Direct | +55.20% | Acquired | (price as of 2026-10-05) |
| June 16, 2021 | MBRX | A | 100,000 | · | · | 728,785 Direct | +15.90% | Acquired | (price as of 2026-10-05) |
| July 13, 2020 | MBRX | M | 79,227 | · | · | 1,046,951 Direct | +8.19% | Acquired | (price as of 2026-10-05) |
| July 13, 2020 | MBRX | F | 19,292 | $0.86 | $16,591 | 1,027,659 Direct | -1.84% | Disposed | -100.0% (price as of 2026-10-05) |
| July 13, 2020 | MBRX | M | 79,227 | · | · | 2,430,891 Direct | -3.16% | Disposed | (price as of 2026-10-05) |
| July 2, 2020 | MBRX | A | 500,000 | · | · | 2,156,907 Direct | +30.18% | Acquired | (price as of 2026-10-05) |
| July 2, 2020 | MBRX | A | 353,211 | · | · | 2,510,118 Direct | +16.38% | Acquired | (price as of 2026-10-05) |
| July 11, 2019 | MBRX | A | 500,000 | · | · | 1,340,000 Direct | +59.52% | Acquired | (price as of 2026-10-05) |
| July 11, 2019 | MBRX | A | 316,907 | · | · | 1,656,907 Direct | +23.65% | Acquired | (price as of 2026-10-05) |
| June 6, 2018 | MBRX | A | 500,000 | · | · | 840,000 Direct | +147.06% | Acquired | (price as of 2026-10-05) |
| June 6, 2018 | MBRX | A | 603,000 | · | · | 943,000 Direct | +177.35% | Acquired | (price as of 2026-10-05) |
| Oct. 3, 2017 | MBRX | A | 340,000 | · | · | 340,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 16, 2017 | MBRX | S | 100,000 | $1.70 | $170,000 | 967,724 Direct | -9.37% | Disposed | -100.0% (price as of 2026-10-05) |
| May 11, 2017 | MBRX | P | 12,000 | $0.81 | $9,720 | 1,067,724 Direct | +1.14% | Acquired | -100.0% (price as of 2026-10-05) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Aug. 3, 2026 | MBRX | Series I Warrants | Common Stock | · | Aug. 3, 2031 | 1,599,999 | Acquired |
| June 22, 2026 | MBRX | Restricted Stock Units | Common Stock | · | · | 360 | Disposed |
| June 20, 2026 | MBRX | Restricted Stock Units | Common Stock | · | · | 150 | Disposed |
| Nov. 12, 2025 | MBRX | Stock option (right to buy) | Common Stock | $0.49 | Nov. 12, 2035 | 830,000 | Acquired |
| Nov. 12, 2025 | MBRX | Performance Based Restricted Stock Units | Common Stock | · | Nov. 12, 2035 | 750,000 | Acquired |
| Nov. 4, 2025 | MBRX | Restricted Stock Units | Common Stock | · | · | 28,750 | Disposed |
| Aug. 11, 2025 | AMIX | Option (Right to buy) | Common Stock | · | June 21, 2034 | 8,773 | Disposed |
| June 23, 2025 | MBRX | Series E Warrants | Common Stock | $0.37 | · | 2,027,025 | Disposed |
| June 22, 2025 | MBRX | Restricted Stock Units | Common Stock | · | · | 8,990 | Disposed |
| June 20, 2025 | MBRX | Restricted Stock Units | Common Stock | · | · | 3,750 | Disposed |
| June 16, 2025 | MBRX | Restricted Stock Units | Common Stock | · | · | 1,667 | Disposed |
| Nov. 4, 2024 | MBRX | Stock option (right to buy) | Common Stock | $2.45 | Nov. 4, 2024 | 100,000 | Acquired |
| Nov. 4, 2024 | MBRX | Restricted Stock Units | Common Stock | · | · | 115,000 | Acquired |
| Oct. 25, 2024 | MBRX | Performance Based Restricted Stock Units | Common Stock | · | Dec. 29, 2033 | 43,590 | Acquired |
| July 2, 2024 | MBRX | Restricted Stock Units | Common Stock | · | · | 982 | Disposed |
| June 22, 2024 | MBRX | Restricted Stock Units | Common Stock | · | · | 8,990 | Disposed |
| June 21, 2024 | AMIX | Option (Right to buy) | Common Stock | $1.33 | June 21, 2034 | 175,452 | Acquired |
| June 20, 2024 | MBRX | Restricted Stock Units | Common Stock | · | · | 3,750 | Disposed |
| June 16, 2024 | MBRX | Restricted Stock Units | Common Stock | · | · | 1,667 | Disposed |
| July 11, 2023 | MBRX | Restricted Stock Units | Common Stock | · | · | 13,204 | Disposed |
| July 2, 2023 | MBRX | Restricted Stock Units | Common Stock | · | · | 14,717 | Disposed |
| June 22, 2023 | MBRX | Stock option (right to buy) | Common Stock | $0.60 | June 22, 2033 | 400,000 | Acquired |
| June 22, 2023 | MBRX | Restricted Stock Units | Common Stock | · | · | 539,375 | Acquired |
| June 20, 2023 | MBRX | Restricted Stock Units | Common Stock | · | · | 56,250 | Disposed |
| June 16, 2023 | MBRX | Restricted Stock Units | Common Stock | · | · | 25,000 | Disposed |
| July 11, 2022 | MBRX | Restricted Stock Units | Common Stock | · | · | 13,205 | Disposed |
| July 11, 2022 | MBRX | Restricted Stock Units | Common Stock | · | · | 13,205 | Disposed |
| July 2, 2022 | MBRX | Restricted Stock Units | Common Stock | · | · | 14,717 | Disposed |
| July 2, 2022 | MBRX | Restricted Stock Units | Common Stock | · | · | 14,717 | Disposed |
| June 20, 2022 | MBRX | Stock option (right to buy) | Common stock | $1.49 | June 20, 2032 | 225,000 | Acquired |
| June 20, 2022 | MBRX | Restricted Stock Units | Common stock | · | · | 225,000 | Acquired |
| June 20, 2022 | MBRX | Stock option (right to buy) | Common stock | $1.49 | June 20, 2032 | 360,000 | Acquired |
| June 20, 2022 | MBRX | Restricted Stock Units | Common stock | · | · | 362,000 | Acquired |
| June 16, 2022 | MBRX | Restricted Stock Units | Common Stock | · | · | 25,000 | Disposed |
| July 11, 2021 | MBRX | Restricted Stock Units | Common Stock | · | · | 13,205 | Disposed |
| July 2, 2021 | MBRX | Restricted Stock Units | Common Stock | · | · | 14,718 | Disposed |
| June 16, 2021 | MBRX | Stock option (right to buy) | Common Stock | $3.73 | June 16, 2031 | 223,635 | Acquired |
| June 16, 2021 | MBRX | Restricted Stock Units | Common Stock | · | · | 100,000 | Acquired |
| July 13, 2020 | MBRX | Restricted Stock Units | Common Stock | · | · | 79,227 | Disposed |
| July 2, 2020 | MBRX | Stock option (right to buy) | Common Stock | $0.93 | July 2, 2030 | 500,000 | Acquired |
| July 2, 2020 | MBRX | Restricted Stock Units | Common Stock | · | · | 353,211 | Acquired |
| July 11, 2019 | MBRX | Stock option (right to buy) | Common Stock | $1.31 | July 11, 2029 | 500,000 | Acquired |
| July 11, 2019 | MBRX | Restricted Stock Units | Common Stock | · | · | 316,907 | Acquired |
| June 6, 2018 | MBRX | Stock option (right to buy) | Common Stock | $1.82 | June 6, 2028 | 500,000 | Acquired |
| June 6, 2018 | MBRX | Stock option (right to buy) | Common stock | $1.82 | June 6, 2028 | 603,000 | Acquired |
| Oct. 3, 2017 | MBRX | Stock option (right to buy) | Common stock | $2.49 | Oct. 3, 2027 | 340,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 4 holdings
Securities held when first becoming an insider, per SEC Form 3.
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $160,417 | · | · | $165,241 | · | · | · | $325,658 |
| 2024 | $200,000 | · | · | · | · | · | · | $200,000 |
| 2023 | $200,000 | · | · | · | · | · | · | $200,000 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.