United States Pharmaceuticals

Inhibrx Biosciences Inc (INBX)

Inhibrx Biosciences witnessed significant insider trading activity recently, with executives accumulating over $6 million in net purchases. CEO Mark Lappe led these acquisitions, signaling confidence despite a 10.7% share price decline over ninety days. These moves follow August's positive earnings report, contrasting with minor divestments by other board members.
Ticker: INBX Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for Inhibrx Biosciences Inc. Upgrade to see score, net flow, insiders and the full signal context.

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Top insiders
Trades
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
422.04
Quantity 68,872 -21.7%
Value US$3,658,966
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
62.55
Quantity 10,223 -2.0%
Value US$2,134,303
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
296.38
Quantity 70,017 -34.8%
Value US$1,047,114
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
85.76
Quantity 100 +0.0%
Value US$8,576
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
85.00
Quantity 2,470 +0.3%
Value US$209,948
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
84.07
Quantity 2,470 +0.3%
Value US$207,655
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
101.70
Quantity 3,000 +0.4%
Value US$305,106
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
98.88
Quantity 1,500 +0.2%
Value US$148,320
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
99.60
Quantity 2,176 +0.3%
Value US$216,727
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
98.87
Quantity 3,324 +0.5%
Value US$328,630
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
100.00
Quantity 5,000 +1.2%
Value US$500,000
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
100.00
Quantity 5,000 +1.2%
Value US$500,000
3.7
MANHARD KIMBERLY Non-Executive Director
Transaction date
Sale
Price
105.05
Quantity 500 -6.2%
Value US$52,525
3.7
MANHARD KIMBERLY Director Non-Executive Director
Transaction date
Proposed sale
Price
105.05
Quantity 500
Value US$52,525
3.7
MANHARD KIMBERLY Non-Executive Director
Transaction date
Sale
Price
110.26
Quantity 500 -5.9%
Value US$55,130
3.7
MANHARD KIMBERLY Director Non-Executive Director
Transaction date
Proposed sale
Price
110.26
Quantity 500
Value US$55,130
3.7
MANHARD KIMBERLY Non-Executive Director
Transaction date
Sale
Price
111.78
Quantity 500 -5.6%
Value US$55,888
3.7
MANHARD KIMBERLY Director Non-Executive Director
Transaction date
Proposed sale
Price
111.78
Quantity 500
Value US$55,888
3.7
MANHARD KIMBERLY Non-Executive Director
Transaction date
Sale
Price
115.80
Quantity 500 -5.3%
Value US$57,898
3.7
MANHARD KIMBERLY Director Non-Executive Director
Transaction date
Proposed sale
Price
115.80
Quantity 500
Value US$57,898
3.7
MANHARD KIMBERLY Non-Executive Director
Transaction date
Sale
Price
115.14
Quantity 500 -5.0%
Value US$57,570
3.7
MANHARD KIMBERLY Director Non-Executive Director
Transaction date
Proposed sale
Price
115.14
Quantity 500
Value US$57,570
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
113.52
Quantity 5,000 +1.2%
Value US$567,580
2.7
FORSYTH DOUGLAS Non-Executive Director
Transaction date
Purchase
Price
114.65
Quantity 2,500 +1.1%
Value US$286,617
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
112.28
Quantity 9,681 +1.3%
Value US$1,087,001
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
111.88
Quantity 1,219 +0.2%
Value US$136,382
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
108.24
Quantity 500 +0.1%
Value US$54,118
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
107.12
Quantity 1,100 +0.2%
Value US$117,836
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
100.64
Quantity 6,605 +0.9%
Value US$664,719
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
99.29
Quantity 5,895 +0.8%
Value US$585,343
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
14.19
Quantity 18,750 +36.7%
Value US$266,102
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
14.19
Quantity 18,750 +36.7%
Value US$266,102
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
14.23
Quantity 34,843 +214.4%
Value US$495,708
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
14.23
Quantity 34,843 +214.4%
Value US$495,708
2.7
Vuori Kristiina MD Non-Executive Director
Transaction date
Purchase
Price
15.00
Quantity 6,667 +48.4%
Value US$100,005
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
17.13
Quantity 13,037 +1.9%
Value US$223,324
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
15.05
Quantity 26,963 +4.1%
Value US$405,793
2.7
Vuori Kristiina MD Non-Executive Director
Transaction date
Purchase
Price
15.07
Quantity 6,457 +88.2%
Value US$97,307
2.7
Vuori Kristiina MD Non-Executive Director
Transaction date
Purchase
Price
15.00
Quantity 179 +2.5%
Value US$2,685
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
15.19
Quantity 8,500 +1.3%
Value US$129,115
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
15.21
Quantity 9,500 +1.5%
Value US$144,495
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
15.29
Quantity 26,000 +4.2%
Value US$397,540
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
16.31
Quantity 4,712 +2.9%
Value US$76,853
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
15.66
Quantity 15,288 +10.5%
Value US$239,410
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
14.02
Quantity 10,000 +7.4%
Value US$140,200
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
14.03
Quantity 10,000 +8.0%
Value US$140,300
2.7
Vuori Kristiina MD Non-Executive Director
Transaction date
Purchase
Price
14.00
Quantity 7,140 New position
Value US$99,960
3.7
MANHARD KIMBERLY Non-Executive Director
Transaction date
Purchase
Price
13.98
Quantity 10,000 New position
Value US$139,800
2.7
FORSYTH DOUGLAS Non-Executive Director
Transaction date
Purchase
Price
14.07
Quantity 59,812 +36.3%
Value US$841,555
2.7
FORSYTH DOUGLAS Non-Executive Director
Transaction date
Purchase
Price
12.89
Quantity 15,188 +10.2%
Value US$195,773
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
12.93
Quantity 12,945 +30.9%
Value US$167,379
2.2
Lappe Mark Chief Executive Officer Executive Director
Transaction date
Purchase
Price
12.97
Quantity 27,055 +182.0%
Value US$350,903
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
17.89
Quantity 8,265 +0.7%
Value US$147,861
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
17.23
Quantity 49,284 +4.5%
Value US$849,163
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
18.24
Quantity 23,726 +2.2%
Value US$432,762
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
17.44
Quantity 65,337 +6.5%
Value US$1,139,477
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
17.90
Quantity 80,738 +8.7%
Value US$1,445,210
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
16.61
Quantity 46,792 +5.3%
Value US$777,215
1.6
Kayyem Jon Faiz Non-Executive Director
Transaction date
Purchase
Price
16.14
Quantity 70,193 +8.7%
Value US$1,132,915
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-10-14 2026-10-14 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
68,872 -21.7%
422.04
US$3,658,966 		68,872 -21.7% 422.04 US$3,658,966
2026-10-14 2026-10-14 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
10,223 -2.0%
62.55
US$2,134,303 		10,223 -2.0% 62.55 US$2,134,303
2026-10-14 2026-10-14 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
70,017 -34.8%
296.38
US$1,047,114 		70,017 -34.8% 296.38 US$1,047,114
2026-10-14 2026-10-14 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
100 +0.0%
85.76
US$8,576 		100 +0.0% 85.76 US$8,576
2026-10-14 2026-10-14 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
2,470 +0.3%
85.00
US$209,948 		2,470 +0.3% 85.00 US$209,948
2026-10-14 2026-10-14 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
2,470 +0.3%
84.07
US$207,655 		2,470 +0.3% 84.07 US$207,655
2026-09-28 2026-09-28 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
3,000 +0.4%
101.70
US$305,106 		3,000 +0.4% 101.70 US$305,106
2026-09-28 2026-09-28 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
1,500 +0.2%
98.88
US$148,320 		1,500 +0.2% 98.88 US$148,320
2026-09-28 2026-09-25 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
2,176 +0.3%
99.60
US$216,727 		2,176 +0.3% 99.60 US$216,727
2026-09-28 2026-09-25 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
3,324 +0.5%
98.87
US$328,630 		3,324 +0.5% 98.87 US$328,630
2026-09-23 2026-09-23 B Purchase
1.6
Kayyem Jon Faiz
Non-Executive Director
5,000 +1.2%
100.00
US$500,000 		5,000 +1.2% 100.00 US$500,000
2026-09-17 2026-09-16 B Purchase
1.6
Kayyem Jon Faiz
Non-Executive Director
5,000 +1.2%
100.00
US$500,000 		5,000 +1.2% 100.00 US$500,000
2026-09-15 2026-09-15 S Sale
3.7
MANHARD KIMBERLY
Non-Executive Director
500 -6.2%
105.05
US$52,525 		500 -6.2% 105.05 US$52,525
2026-09-15 2026-09-15 PrS Proposed sale
3.7
MANHARD KIMBERLY

Director

Non-Executive Director
500
105.05
US$52,525 		500 105.05 US$52,525
2026-09-15 2026-09-14 S Sale
3.7
MANHARD KIMBERLY
Non-Executive Director
500 -5.9%
110.26
US$55,130 		500 -5.9% 110.26 US$55,130
2026-09-14 2026-09-14 PrS Proposed sale
3.7
MANHARD KIMBERLY

Director

Non-Executive Director
500
110.26
US$55,130 		500 110.26 US$55,130
2026-09-15 2026-09-11 S Sale
3.7
MANHARD KIMBERLY
Non-Executive Director
500 -5.6%
111.78
US$55,888 		500 -5.6% 111.78 US$55,888
2026-09-11 2026-09-11 PrS Proposed sale
3.7
MANHARD KIMBERLY

Director

Non-Executive Director
500
111.78
US$55,888 		500 111.78 US$55,888
2026-09-10 2026-09-09 S Sale
3.7
MANHARD KIMBERLY
Non-Executive Director
500 -5.3%
115.80
US$57,898 		500 -5.3% 115.80 US$57,898
2026-09-09 2026-09-09 PrS Proposed sale
3.7
MANHARD KIMBERLY

Director

Non-Executive Director
500
115.80
US$57,898 		500 115.80 US$57,898
2026-09-10 2026-09-08 S Sale
3.7
MANHARD KIMBERLY
Non-Executive Director
500 -5.0%
115.14
US$57,570 		500 -5.0% 115.14 US$57,570
2026-09-08 2026-09-08 PrS Proposed sale
3.7
MANHARD KIMBERLY

Director

Non-Executive Director
500
115.14
US$57,570 		500 115.14 US$57,570
2026-09-08 2026-09-08 B Purchase
1.6
Kayyem Jon Faiz
Non-Executive Director
5,000 +1.2%
113.52
US$567,580 		5,000 +1.2% 113.52 US$567,580
2026-09-08 2026-09-08 B Purchase
2.7
FORSYTH DOUGLAS
Non-Executive Director
2,500 +1.1%
114.65
US$286,617 		2,500 +1.1% 114.65 US$286,617
2026-09-08 2026-09-08 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
9,681 +1.3%
112.28
US$1,087,001 		9,681 +1.3% 112.28 US$1,087,001
2026-09-08 2026-09-08 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
1,219 +0.2%
111.88
US$136,382 		1,219 +0.2% 111.88 US$136,382
2026-09-08 2026-09-08 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
500 +0.1%
108.24
US$54,118 		500 +0.1% 108.24 US$54,118
2026-09-08 2026-09-08 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
1,100 +0.2%
107.12
US$117,836 		1,100 +0.2% 107.12 US$117,836
2026-09-08 2026-09-08 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
6,605 +0.9%
100.64
US$664,719 		6,605 +0.9% 100.64 US$664,719
2026-09-08 2026-09-08 B Purchase
2.2
Lappe Mark

Chief Executive Officer

Executive Director
5,895 +0.8%
99.29
US$585,343 		5,895 +0.8% 99.29 US$585,343
2025-10-09 2025-10-07 S Sale
3.2
VIKING GLOBAL INVESTORS LP
Large shareholder
25,042 -19.6%
32.25
US$807,604 		25,042 -19.6% 32.25 US$807,604
2025-10-09 2025-10-07 S Sale
3.2
VIKING GLOBAL INVESTORS LP
Large shareholder
16,315 -19.6%
32.25
US$526,159 		16,315 -19.6% 32.25 US$526,159
2025-10-09 2025-10-07 S Sale
3.2
VIKING GLOBAL INVESTORS LP
Large shareholder
308,643 -19.6%
32.25
US$9,953,737 		308,643 -19.6% 32.25 US$9,953,737
2024-11-22 2024-11-20 B Purchase
1.6
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
1.6
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
1.6
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
1.6
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
2.2
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
2.2
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
2.2
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
2.2
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
2.2
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
2.2
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
2.2
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
2.2
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
2.2
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 New position
14.00
US$99,960 		7,140 New position 14.00 US$99,960
2024-08-30 2024-08-28 B Purchase
3.7
MANHARD KIMBERLY
Non-Executive Director
10,000 New position
13.98
US$139,800 		10,000 New position 13.98 US$139,800
2024-08-26 2024-08-23 B Purchase
2.7
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
2.7
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
2.2
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
2.2
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
1.6
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
1.6
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
1.6
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
1.6
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
1.6
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
1.6
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
1.6
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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