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Inhibrx Biosciences, Inc.

INBX Net buying
CIK 0002007919 #2266 in the set updated 17 Sep 2026
Bought (120 mo)
$14.84M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$11.57M
$0.00 on a plan · $0.00 straight out of an exercise
Sold at will
$11.57M
8 of 8 sales
Net
+$3.27M
+$3.27M against sales at will

By person

8 insiders · 45 transactions
250×

Mark P. Lappe holds 250 times base salary in stock. $173.96M of shares against $695.25K in salary for 2025.

Salary from the company's own proxy. The shares are what Mark P. Lappe last reported holding, valued at $105.05, the price Common Stock was last bought or sold at on the open market here, on 15 Sep 2026.

Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
VIKING GLOBAL INVESTORS LP entity
10% owner
—
$11.29M (3)
−$11.29M
102,864
0.6989%
$10.81M
−77.3%
Kayyem Jon Faiz
Director
$8.02M (12)
—
+$8.02M
1,483,406
10.08%
$155.83M
+253.7%
Lappe Mark
Chief Executive Officer
$5.06M (17)
—
+$5.06M
1,655,961
11.25%
$173.96M
+134.7%
FORSYTH DOUGLAS
Director
$1.32M (3)
—
+$1.32M
451,628
3.07%
$47.44M
+101.1%
Vuori Kristiina MD
Director
$299.96K (4)
—
+$299.96K
20,443
0.1389%
$2.15M
—
MANHARD KIMBERLY
Director
$139.80K (1)
$279.01K (5)
−$139.21K
17,500
0.1189%
$1.84M
+75.0%
Inhibrx, Inc. entity
10% owner
—
—
—
1,157,926
7.87%
$121.64M
−92.0%
Eckelman Brendan P.
Chief Scientific Officer
—
—
—
40,000
0.2718%
$4.20M
—

Individual transactions

37
Insider
Date
Role
Action
Shares
Price
Amount
Lappe Mark
8 Sep 2026
Chief Executive Officer
Buy indirect
9,681
$112.28
$1.09M
Lappe Mark
8 Sep 2026
Chief Executive Officer
Buy indirect
1,219
$111.88
$136.38K
Lappe Mark
8 Sep 2026
Chief Executive Officer
Buy indirect
500
$108.24
$54.12K
Lappe Mark
8 Sep 2026
Chief Executive Officer
Buy indirect
1,100
$107.12
$117.84K
Lappe Mark
8 Sep 2026
Chief Executive Officer
Buy indirect
6,605
$100.64
$664.72K
Lappe Mark
8 Sep 2026
Chief Executive Officer
Buy indirect
5,895
$99.29
$585.34K
FORSYTH DOUGLAS
8 Sep 2026
Director
Buy indirect
2,500
$114.65
$286.62K
Kayyem Jon Faiz
8 Sep 2026
Director
Buy indirect
5,000
$113.52
$567.58K
Kayyem Jon Faiz
20 Nov 2024
Director
Buy indirect
18,750
$14.19
$266.10K
Kayyem Jon Faiz
20 Nov 2024
Director
Buy indirect
18,750
$14.19
$266.10K
Kayyem Jon Faiz
19 Nov 2024
Director
Buy indirect
34,843
$14.23
$495.71K
Kayyem Jon Faiz
19 Nov 2024
Director
Buy indirect
34,843
$14.23
$495.71K
Vuori Kristiina MD
3 Oct 2024
Director
Buy
6,667
$15.00
$100.01K
Lappe Mark
16 Sep 2024
Chief Executive Officer
Buy indirect
13,037
$17.13
$223.32K
Lappe Mark
12 Sep 2024
Chief Executive Officer
Buy indirect
26,963
$15.05
$405.79K
Vuori Kristiina MD
11 Sep 2024
Director
Buy
6,457
$15.07
$97.31K
Lappe Mark
10 Sep 2024
Chief Executive Officer
Buy indirect
8,500
$15.19
$129.12K
Vuori Kristiina MD
10 Sep 2024
Director
Buy
179
$15.00
$2.69K
Lappe Mark
9 Sep 2024
Chief Executive Officer
Buy indirect
9,500
$15.21
$144.50K
Lappe Mark
6 Sep 2024
Chief Executive Officer
Buy indirect
26,000
$15.29
$397.54K
Lappe Mark
3 Sep 2024
Chief Executive Officer
Buy indirect
4,712
$16.31
$76.85K
Lappe Mark
3 Sep 2024
Chief Executive Officer
Buy indirect
15,288
$15.66
$239.41K
Lappe Mark
30 Aug 2024
Chief Executive Officer
Buy indirect
10,000
$14.02
$140.20K
Vuori Kristiina MD
29 Aug 2024
Director
Buy
7,140
$14.00
$99.96K
Lappe Mark
29 Aug 2024
Chief Executive Officer
Buy indirect
10,000
$14.03
$140.30K
MANHARD KIMBERLY
28 Aug 2024
Director
Buy indirect
10,000
$13.98
$139.80K
FORSYTH DOUGLAS
23 Aug 2024
Director
Buy indirect
59,812
$14.07
$841.55K
FORSYTH DOUGLAS
22 Aug 2024
Director
Buy indirect
15,188
$12.89
$195.77K
Lappe Mark
21 Aug 2024
Chief Executive Officer
Buy indirect
12,945
$12.93
$167.38K
Lappe Mark
20 Aug 2024
Chief Executive Officer
Buy indirect
27,055
$12.97
$350.90K
Kayyem Jon Faiz
5 Jun 2024
Director
Buy indirect
8,265
$17.89
$147.86K
Kayyem Jon Faiz
5 Jun 2024
Director
Buy indirect
49,284
$17.23
$849.16K
Kayyem Jon Faiz
4 Jun 2024
Director
Buy indirect
23,726
$18.24
$432.76K
Kayyem Jon Faiz
4 Jun 2024
Director
Buy indirect
65,337
$17.44
$1.14M
Kayyem Jon Faiz
3 Jun 2024
Director
Buy indirect
80,738
$17.90
$1.45M
Kayyem Jon Faiz
3 Jun 2024
Director
Buy indirect
46,792
$16.61
$777.22K
Kayyem Jon Faiz
31 May 2024
Director
Buy indirect
70,193
$16.14
$1.13M
Show all 45 transactions →

What was left out

Form 4 filings counted 41
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 1
Sales on a Rule 10b5-1 plan 0
Sales straight out of an exercise 0
Sales at will 8
Transactions with no price 0
Shares from compensation/vesting 16,810,630
History held since 30 May 2024