Inhibrx Biosciences Inc.
INBXHealthcare|Biotechnology|US
$84.52
+4.24 (+5.28%)
DCF Value
$0.74
Cash / Share
$8.51
Ownership Breakdown
74.4%
Float
14.7M
Shares Outstanding
11.0M
Float Shares
Major Holders (23)
Combined: 149.6%
Holders of 5%+ from their latest Schedule 13D/13G filing in the last two years. Percentages are as of each filing date.
| Holder | Type | % of Class | Shares | Filed | Filing |
|---|---|---|---|---|---|
| Perceptive Life Sciences Master Fund, Ltd. | Corporation | 9.99% | 1,489,443 | Aug 14, 2026 | 13D/G |
| Joseph Edelman | Individual | 9.99% | 1,489,443 | Aug 14, 2026 | 13D/G |
| Perceptive Advisors LLC | Investment adviser | 9.99% | 1,489,443 | Aug 14, 2026 | 13D/G |
| Ott David C. | Individual | 9.99% | 1,454,608 | Feb 17, 2026 | 13D/G |
| Viking Global Investors LP | Partnership | 9.30% | 1,383,621 | Aug 14, 2026 | 13D/G |
| Viking Global Opportunities Parent GP LLC | Other | 9.30% | 1,383,621 | Aug 14, 2026 | 13D/G |
| Halvorsen Ole Andreas | Individual | 9.30% | 1,383,621 | Aug 14, 2026 | 13D/G |
| Shabet Rose Sharon | Individual | 9.30% | 1,383,621 | Aug 14, 2026 | 13D/G |
| Viking Global Opportunities GP LLC | Other | 8.70% | 1,303,208 | Aug 14, 2026 | 13D/G |
| Viking Global Opportunities Portfolio GP LLC | Other | 8.40% | 1,250,816 | Aug 14, 2026 | 13D/G |
| Viking Global Opportunities Illiquid Investments Sub-Master LP | Partnership | 8.40% | 1,250,816 | Aug 14, 2026 | 13D/G |
| Morgan Stanley | HC, CO | 7.90% | 1,155,416 | Feb 11, 2026 | 13D/G |
| Jon Faiz Kayyem | Individual | 7.90% | 1,149,046 | Feb 26, 2025 | 13D/G |
| Mark Lappe | Individual | 6.40% | 925,413 | Feb 26, 2025 | 13D/G |
| Morgan Stanley Capital Services LLC | BD, CO | 6.30% | 918,011 | Feb 11, 2026 | 13D/G |
| Schonfeld Strategic Advisors LLC | Investment adviser | 5.33% | 781,678 | Aug 14, 2026 | 13D/G |
| BlackRock, Inc. | Holding company | 5.30% | 768,130 | Jan 21, 2026 | 13D/G |
| The Jon F. Kayyem and Paige Gates-Kayyem Family Trust | Other | 3.50% | 509,360 | Feb 26, 2025 | 13D/G |
| Bank of America Corp /De/ | Holding company | 2.40% | 357,318 | Oct 28, 2026 | 13D/G |
| Viking Global Opportunities Drawdown GP LLC | Other | 0.50% | 80,413 | Aug 14, 2026 | 13D/G |
| Viking Global Opportunities Drawdown Portfolio GP LLC | Other | 0.50% | 80,413 | Aug 14, 2026 | 13D/G |
| Viking Global Opportunities Drawdown (Aggregator) LP | Partnership | 0.50% | 80,413 | Aug 14, 2026 | 13D/G |
| Kavra 104 LLC | Other | 0.40% | 52,392 | Aug 14, 2026 | 13D/G |
Insider Trades (100)
Last 4 quarters: 212,540 acquired · 352,500 disposed
| Insider | Position | Date | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Lappe Mark | director, officer: Chief Executive Officer | Oct 14, 2026 | BUY | 100 | $85.76 | $8.6K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Oct 14, 2026 | BUY | 2,470 | $85.00 | $209.9K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Oct 14, 2026 | BUY | 2,470 | $84.07 | $207.7K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Oct 14, 2026 | BUY | 100 | $85.76 | $8.6K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Oct 14, 2026 | BUY | 2,451 | $85.00 | $208.3K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Oct 14, 2026 | BUY | 2,449 | $84.07 | $205.9K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 28, 2026 | BUY | 3,000 | $101.70 | $305.1K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 28, 2026 | BUY | 1,500 | $98.88 | $148.3K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 25, 2026 | BUY | 2,176 | $99.60 | $216.7K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 25, 2026 | BUY | 3,324 | $98.87 | $328.6K | Form 4 |
| Kayyem Jon Faiz | director | Sep 23, 2026 | BUY | 5,000 | $100.00 | $500.0K | Form 4 |
| FORSYTH DOUGLAS | director | Jun 3, 2026 | AWARD | 10,000 | $95.22 | $952.2K | Form 4 |
| Vuori Kristiina MD | director | Jun 3, 2026 | AWARD | 10,000 | $95.22 | $952.2K | Form 4 |
| MANHARD KIMBERLY | director | Jun 3, 2026 | AWARD | 10,000 | $95.22 | $952.2K | Form 4 |
| Kayyem Jon Faiz | director | Jun 3, 2026 | AWARD | 10,000 | $95.22 | $952.2K | Form 4 |
| Kayyem Jon Faiz | director | Sep 16, 2026 | BUY | 5,000 | $100.00 | $500.0K | Form 4 |
| MANHARD KIMBERLY | director | Sep 11, 2026 | SELL | 500 | $111.78 | $55.9K | Form 4 |
| MANHARD KIMBERLY | director | Sep 14, 2026 | SELL | 500 | $110.26 | $55.1K | Form 4 |
| MANHARD KIMBERLY | director | Sep 15, 2026 | SELL | 500 | $105.05 | $52.5K | Form 4 |
| MANHARD KIMBERLY | director | Sep 8, 2026 | SELL | 500 | $115.14 | $57.6K | Form 4 |
| MANHARD KIMBERLY | director | Sep 9, 2026 | SELL | 500 | $115.80 | $57.9K | Form 4 |
| Kayyem Jon Faiz | director | Sep 8, 2026 | BUY | 5,000 | $113.52 | $567.6K | Form 4 |
| FORSYTH DOUGLAS | director | Sep 8, 2026 | BUY | 2,500 | $114.65 | $286.6K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 8, 2026 | BUY | 9,681 | $112.28 | $1.1M | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 8, 2026 | BUY | 1,219 | $111.88 | $136.4K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 8, 2026 | BUY | 500 | $108.23 | $54.1K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 8, 2026 | BUY | 1,100 | $107.12 | $117.8K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 8, 2026 | BUY | 6,605 | $100.64 | $664.7K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 8, 2026 | BUY | 5,895 | $99.29 | $585.3K | Form 4 |
| Vuori Kristiina MD | director | Jun 3, 2026 | AWARD | 15,000 | $95.22 | $1.4M | Form 4 |
| Kayyem Jon Faiz | director | Jun 3, 2026 | AWARD | 15,000 | $95.22 | $1.4M | Form 4 |
| FORSYTH DOUGLAS | director | Jun 3, 2026 | AWARD | 15,000 | $95.22 | $1.4M | Form 4 |
| MANHARD KIMBERLY | director | Jun 3, 2026 | AWARD | 15,000 | $95.22 | $1.4M | Form 4 |
| Matly David | President | Apr 24, 2026 | AWARD | 50,000 | $129.06 | $6.5M | Form 4 |
| VIKING GLOBAL INVESTORS LP | 10 percent owner | Oct 7, 2025 | SELL | 308,643 | $32.25 | $10.0M | Form 4 |
| VIKING GLOBAL INVESTORS LP | 10 percent owner | Oct 7, 2025 | SELL | 25,042 | $32.25 | $807.6K | Form 4 |
| VIKING GLOBAL INVESTORS LP | 10 percent owner | Oct 7, 2025 | SELL | 16,315 | $32.25 | $526.2K | Form 4 |
| MANHARD KIMBERLY | director | May 28, 2025 | AWARD | 15,000 | $12.91 | $193.7K | Form 4 |
| Vuori Kristiina MD | director | May 28, 2025 | AWARD | 15,000 | $12.91 | $193.7K | Form 4 |
| Kayyem Jon Faiz | director | May 28, 2025 | AWARD | 15,000 | $12.91 | $193.7K | Form 4 |
| FORSYTH DOUGLAS | director | May 28, 2025 | AWARD | 15,000 | $12.91 | $193.7K | Form 4 |
| Deck Kelly | Chief Financial Officer | Apr 1, 2025 | AWARD | 15,000 | $14.05 | $210.8K | Form 4 |
| Matly David | President | Apr 1, 2025 | AWARD | 50,000 | $14.05 | $702.5K | Form 4 |
| Matly David | President | Apr 1, 2025 | OTHER | 175,000 | $15.86 | $2.8M | Form 4 |
| Kayyem Jon Faiz | director | Mar 27, 2025 | GIFT | 90,000 | — | — | Form 4 |
| Kayyem Jon Faiz | director | Dec 16, 2024 | GIFT | 500,000 | — | — | Form 4 |
| Kayyem Jon Faiz | director | Dec 16, 2024 | GIFT | 250,000 | — | — | Form 4 |
| Kayyem Jon Faiz | director | Dec 6, 2024 | GIFT | 52,000 | — | — | Form 4 |
| Kayyem Jon Faiz | director | Nov 20, 2024 | BUY | 18,750 | $14.19 | $266.1K | Form 4 |
| Kayyem Jon Faiz | director | Nov 19, 2024 | BUY | 34,843 | $14.23 | $495.7K | Form 4 |
| Vuori Kristiina MD | director | Oct 3, 2024 | BUY | 6,667 | $15.00 | $100.0K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 16, 2024 | BUY | 13,037 | $17.13 | $223.3K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 12, 2024 | BUY | 26,963 | $15.05 | $405.8K | Form 4 |
| Vuori Kristiina MD | director | Sep 11, 2024 | BUY | 6,457 | $15.07 | $97.3K | Form 4 |
| Vuori Kristiina MD | director | Sep 10, 2024 | BUY | 179 | $15.00 | $2.7K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 10, 2024 | BUY | 8,500 | $15.19 | $129.1K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 9, 2024 | BUY | 9,500 | $15.21 | $144.5K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Sep 6, 2024 | BUY | 26,000 | $15.29 | $397.5K | Form 4 |
| MANHARD KIMBERLY | director | Aug 28, 2024 | BUY | 10,000 | $13.98 | $139.8K | Form 4 |
| FORSYTH DOUGLAS | director | Aug 23, 2024 | BUY | 59,812 | $14.07 | $841.6K | Form 4 |
| FORSYTH DOUGLAS | director | Aug 22, 2024 | BUY | 15,188 | $12.89 | $195.8K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Aug 21, 2024 | BUY | 12,945 | $12.93 | $167.4K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | Aug 20, 2024 | BUY | 27,055 | $12.97 | $350.9K | Form 4 |
| Kayyem Jon Faiz | director | Jun 24, 2024 | GIFT | 89,050 | — | — | Form 4 |
| Kayyem Jon Faiz | director | Jun 24, 2024 | GIFT | 10,000 | — | — | Form 4 |
| Kayyem Jon Faiz | director | Jun 5, 2024 | BUY | 8,265 | $17.89 | $147.9K | Form 4 |
| Kayyem Jon Faiz | director | Jun 5, 2024 | BUY | 49,284 | $17.23 | $849.2K | Form 4 |
| Kayyem Jon Faiz | director | Jun 4, 2024 | BUY | 23,726 | $18.24 | $432.8K | Form 4 |
| Kayyem Jon Faiz | director | Jun 4, 2024 | BUY | 65,337 | $17.44 | $1.1M | Form 4 |
| Kayyem Jon Faiz | director | Jun 3, 2024 | BUY | 80,738 | $17.90 | $1.4M | Form 4 |
| Kayyem Jon Faiz | director | Jun 3, 2024 | BUY | 46,792 | $16.61 | $777.2K | Form 4 |
| Kayyem Jon Faiz | director | May 31, 2024 | BUY | 70,193 | $16.14 | $1.1M | Form 4 |
| VIKING GLOBAL INVESTORS LP | 10 percent owner | May 30, 2024 | DISPOSED | 1,038,765 | $0.00 | $103.88 | Form 4 |
| VIKING GLOBAL INVESTORS LP | 10 percent owner | May 30, 2024 | DISPOSED | 511,627 | $30.00 | $15.3M | Form 4 |
| Inhibrx, Inc. | 10 percent owner | May 29, 2024 | DISPOSED | 13,316,140 | — | — | Form 4 |
| Vuori Kristiina MD | director | May 30, 2024 | DISPOSED | 15,000 | $12.57 | $188.6K | Form 4 |
| Vuori Kristiina MD | director | May 30, 2024 | DISPOSED | 30,000 | $40.45 | $1.2M | Form 4 |
| Vuori Kristiina MD | director | May 30, 2024 | DISPOSED | 15,000 | $23.03 | $345.4K | Form 4 |
| MANHARD KIMBERLY | director | May 30, 2024 | DISPOSED | 3,500 | $17.44 | $61.0K | Form 4 |
| MANHARD KIMBERLY | director | May 30, 2024 | DISPOSED | 15,000 | $24.78 | $371.7K | Form 4 |
| MANHARD KIMBERLY | director | May 30, 2024 | DISPOSED | 15,000 | $23.03 | $345.4K | Form 4 |
| MANHARD KIMBERLY | director | May 30, 2024 | DISPOSED | 15,000 | $12.57 | $188.6K | Form 4 |
| MANHARD KIMBERLY | director | May 30, 2024 | DISPOSED | 17,259 | $20.43 | $352.6K | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | May 30, 2024 | DISPOSED | 100,000 | $23.30 | $2.3M | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | May 30, 2024 | DISPOSED | 59,462 | $30.00 | $1.8M | Form 4 |
| Lappe Mark | director, officer: Chief Executive Officer | May 30, 2024 | DISPOSED | 145,000 | $33.63 | $4.9M | Form 4 |
| Kayyem Jon Faiz | director | May 30, 2024 | DISPOSED | 17,259 | $10.52 | $181.6K | Form 4 |
| Kayyem Jon Faiz | director | May 30, 2024 | DISPOSED | 15,000 | $24.78 | $371.7K | Form 4 |
| Kayyem Jon Faiz | director | May 30, 2024 | DISPOSED | 25,000 | $30.00 | $750.0K | Form 4 |
| Kayyem Jon Faiz | director | May 30, 2024 | DISPOSED | 15,000 | $23.03 | $345.4K | Form 4 |
| Kayyem Jon Faiz | director | May 30, 2024 | DISPOSED | 15,000 | $12.57 | $188.6K | Form 4 |
| FORSYTH DOUGLAS | director | May 30, 2024 | DISPOSED | 15,000 | $12.57 | $188.6K | Form 4 |
| FORSYTH DOUGLAS | director | May 30, 2024 | DISPOSED | 598,257 | $30.00 | $17.9M | Form 4 |
| FORSYTH DOUGLAS | director | May 30, 2024 | DISPOSED | 17,259 | $10.52 | $181.6K | Form 4 |
| FORSYTH DOUGLAS | director | May 30, 2024 | DISPOSED | 15,000 | $23.03 | $345.4K | Form 4 |
| FORSYTH DOUGLAS | director | May 30, 2024 | DISPOSED | 15,000 | $24.78 | $371.7K | Form 4 |
| Eckelman Brendan P. | Chief Scientific Officer | May 28, 2024 | SELL | 300,000 | $34.30 | $10.3M | Form 4 |
| Eckelman Brendan P. | Chief Scientific Officer | May 30, 2024 | DISPOSED | 6,667 | $33.63 | $224.2K | Form 4 |
| Eckelman Brendan P. | Chief Scientific Officer | May 30, 2024 | DISPOSED | 160,000 | $30.00 | $4.8M | Form 4 |
| Eckelman Brendan P. | Chief Scientific Officer | May 30, 2024 | DISPOSED | 26,667 | $23.30 | $621.3K | Form 4 |