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United States Pharmaceuticals

Inhibrx Biosciences Inc (INBX)

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The most recent insider trading activity occurred on October 7, 2025, with significant sell transactions by VIKING GLOBAL INVESTORS LP totaling over $11 million. Prior to this, in November 2024, Kayyem Jon Faiz made several buy transactions. Earlier in September 2024, CEO Mark Lappe and Kristiina MD Vuori also engaged in multiple buy transactions.
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Ticker: INBX Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
VIKING GLOBAL INVESTORS LP
3 sales — total 11,287,500 USD
Sale 7 Oct 2025
Value US$3,634,987.62 | Price 377.09 | Shares 4,175
Sale 7 Oct 2025
Value US$1,828,320.57 | Price 202.56 | Shares 76,763
Sale 7 Oct 2025
Value US$9,953,736.75 | Price 32.25 | Shares 308,643
Buy 20 Nov 2024
Value US$1,952,862.56 | Price 256.58 | Shares 18,247
Buy 20 Nov 2024
Value US$281,901.52 | Price 166.76 | Shares 14,907
Buy 19 Nov 2024
Value US$495,707.88 | Price 14.23 | Shares 34,843
Buy 19 Nov 2024
Value US$495,707.88 | Price 14.23 | Shares 34,843
Buy 3 Oct 2024
Value US$100,005.00 | Price 15.00 | Shares 6,667
Buy 16 Sep 2024
Value US$223,323.81 | Price 17.13 | Shares 13,037
Buy 12 Sep 2024
Value US$405,793.15 | Price 15.05 | Shares 26,963
Buy 11 Sep 2024
Value US$97,306.99 | Price 15.07 | Shares 6,457
Buy 10 Sep 2024
Value US$2,685.00 | Price 15.00 | Shares 179
Buy 10 Sep 2024
Value US$129,115.00 | Price 15.19 | Shares 8,500
Buy 9 Sep 2024
Value US$144,495.00 | Price 15.21 | Shares 9,500
Buy 6 Sep 2024
Value US$397,540.00 | Price 15.29 | Shares 26,000
Buy 3 Sep 2024
Value US$76,852.72 | Price 16.31 | Shares 4,712
Buy 3 Sep 2024
Value US$239,410.08 | Price 15.66 | Shares 15,288
Buy 30 Aug 2024
Value US$140,200.00 | Price 14.02 | Shares 10,000
Buy 29 Aug 2024
Value US$140,300.00 | Price 14.03 | Shares 10,000
Buy 29 Aug 2024
Value US$99,960.00 | Price 14.00 | Shares 7,140
Buy 28 Aug 2024
Value US$139,800.00 | Price 13.98 | Shares 10,000
Buy 23 Aug 2024
Value US$841,554.84 | Price 14.07 | Shares 59,812
Buy 22 Aug 2024
Value US$195,773.32 | Price 12.89 | Shares 15,188
Buy 21 Aug 2024
Value US$167,378.85 | Price 12.93 | Shares 12,945
Buy 20 Aug 2024
Value US$350,903.35 | Price 12.97 | Shares 27,055
Buy 5 Jun 2024
Value US$147,860.85 | Price 17.89 | Shares 8,265
Buy 5 Jun 2024
Value US$849,163.32 | Price 17.23 | Shares 49,284
Buy 4 Jun 2024
Value US$432,762.24 | Price 18.24 | Shares 23,726
Buy 4 Jun 2024
Value US$1,139,477.28 | Price 17.44 | Shares 65,337
Buy 3 Jun 2024
Value US$1,445,210.20 | Price 17.90 | Shares 80,738
Buy 3 Jun 2024
Value US$777,215.12 | Price 16.61 | Shares 46,792
Buy 31 May 2024
Value US$1,132,915.02 | Price 16.14 | Shares 70,193
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2025-10-09 2025-10-07 S Sale
3.2
VIKING GLOBAL INVESTORS LP
Large shareholder
4,175 -4.1%
377.09
US$3,634,988 		4,175 -4.1% 377.09 US$3,634,988
2025-10-09 2025-10-07 S Sale
3.2
VIKING GLOBAL INVESTORS LP
Large shareholder
76,763 -39.5%
202.56
US$1,828,321 		76,763 -39.5% 202.56 US$1,828,321
2025-10-09 2025-10-07 S Sale
3.2
VIKING GLOBAL INVESTORS LP
Large shareholder
37,493 -30.9%
304.61
US$993,308 		37,493 -30.9% 304.61 US$993,308
2024-11-22 2024-11-20 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
18,750 +36.7%
14.19
US$266,102 		18,750 +36.7% 14.19 US$266,102
2024-11-22 2024-11-20 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
18,750 +36.7%
14.19
US$266,102 		18,750 +36.7% 14.19 US$266,102
2024-11-22 2024-11-19 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
34,843 +214.4%
14.23
US$495,708 		34,843 +214.4% 14.23 US$495,708
2024-11-22 2024-11-19 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
34,843 +214.4%
14.23
US$495,708 		34,843 +214.4% 14.23 US$495,708
2024-10-07 2024-10-03 B Purchase
2.7
Vuori Kristiina MD
Non-Executive Director
6,667 +48.4%
15.00
US$100,005 		6,667 +48.4% 15.00 US$100,005
2024-09-16 2024-09-16 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
13,037 +1.9%
17.13
US$223,324 		13,037 +1.9% 17.13 US$223,324
2024-09-16 2024-09-12 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
26,963 +4.1%
15.05
US$405,793 		26,963 +4.1% 15.05 US$405,793
2024-09-12 2024-09-11 B Purchase
2.7
Vuori Kristiina MD
Non-Executive Director
6,457 +88.2%
15.07
US$97,307 		6,457 +88.2% 15.07 US$97,307
2024-09-12 2024-09-10 B Purchase
2.7
Vuori Kristiina MD
Non-Executive Director
179 +2.5%
15.00
US$2,685 		179 +2.5% 15.00 US$2,685
2024-09-10 2024-09-10 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
8,500 +1.3%
15.19
US$129,115 		8,500 +1.3% 15.19 US$129,115
2024-09-10 2024-09-09 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
9,500 +1.5%
15.21
US$144,495 		9,500 +1.5% 15.21 US$144,495
2024-09-10 2024-09-06 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
26,000 +4.2%
15.29
US$397,540 		26,000 +4.2% 15.29 US$397,540
2024-09-03 2024-09-03 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
4,712 +2.9%
16.31
US$76,853 		4,712 +2.9% 16.31 US$76,853
2024-09-03 2024-09-03 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
15,288 +10.5%
15.66
US$239,410 		15,288 +10.5% 15.66 US$239,410
2024-09-03 2024-08-30 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
10,000 +7.4%
14.02
US$140,200 		10,000 +7.4% 14.02 US$140,200
2024-09-03 2024-08-29 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
10,000 +8.0%
14.03
US$140,300 		10,000 +8.0% 14.03 US$140,300
2024-09-03 2024-08-29 B Purchase
2.7
Vuori Kristiina MD
Non-Executive Director
7,140 +inf%
14.00
US$99,960 		7,140 +inf% 14.00 US$99,960
2024-08-30 2024-08-28 B Purchase
3.0
MANHARD KIMBERLY
Non-Executive Director
10,000 +inf%
13.98
US$139,800 		10,000 +inf% 13.98 US$139,800
2024-08-26 2024-08-23 B Purchase
2.8
FORSYTH DOUGLAS
Non-Executive Director
59,812 +36.3%
14.07
US$841,555 		59,812 +36.3% 14.07 US$841,555
2024-08-26 2024-08-22 B Purchase
2.8
FORSYTH DOUGLAS
Non-Executive Director
15,188 +10.2%
12.89
US$195,773 		15,188 +10.2% 12.89 US$195,773
2024-08-22 2024-08-21 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
12,945 +30.9%
12.93
US$167,379 		12,945 +30.9% 12.93 US$167,379
2024-08-22 2024-08-20 B Purchase
2.5
Lappe Mark

Chief Executive Officer

Executive Director
27,055 +182.0%
12.97
US$350,903 		27,055 +182.0% 12.97 US$350,903
2024-06-07 2024-06-05 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
8,265 +0.7%
17.89
US$147,861 		8,265 +0.7% 17.89 US$147,861
2024-06-07 2024-06-05 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
49,284 +4.5%
17.23
US$849,163 		49,284 +4.5% 17.23 US$849,163
2024-06-04 2024-06-04 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
23,726 +2.2%
18.24
US$432,762 		23,726 +2.2% 18.24 US$432,762
2024-06-04 2024-06-04 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
65,337 +6.5%
17.44
US$1,139,477 		65,337 +6.5% 17.44 US$1,139,477
2024-06-04 2024-06-03 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
80,738 +8.7%
17.90
US$1,445,210 		80,738 +8.7% 17.90 US$1,445,210
2024-06-04 2024-06-03 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
46,792 +5.3%
16.61
US$777,215 		46,792 +5.3% 16.61 US$777,215
2024-06-04 2024-05-31 B Purchase
1.5
Kayyem Jon Faiz
Non-Executive Director
70,193 +8.7%
16.14
US$1,132,915 		70,193 +8.7% 16.14 US$1,132,915
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