StockCIK 2007919

Inhibrx Biosciences, Inc. (INBX): Insider Trades and Fund Holdings

In the past 12 months, Inhibrx Biosciences, Inc. insiders reported 8 open-market purchases worth $6.35M and 5 sales worth $279K; 0 of the sales were reported as made under a 10b5-1 trading plan.

8Insider buys, 12 months

$6.35MBought by insiders, 12 months

$279KSold by insiders, 12 months

2Tracked funds holding

Recent insider trades

Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Oct 14, 2026.

Recent INBX insider trades
Filed	Traded	Insider	Role	Type	Shares	Price ($)	Value	Holding	Filing
Oct 14	Oct 14	Mark LappeCEO	CEO (ind.)	▲ BUY	10,040	84.56	$849K	+6.3%	Form 4 ↗
Sep 28	Sep 25	Mark LappeCEO	CEO (ind.)	▲ BUY	5,500	99.16	$545K	+0.8%	Form 4 ↗
Sep 28	Sep 28	Mark LappeCEO	CEO (ind.)	▲ BUY	4,500	100.76	$453K	+0.6%	Form 4 ↗
Sep 23	Sep 23	Jon Faiz KayyemDirector	Director (ind.)	▲ BUY	5,000	100.00	$500K	+1.2%	Form 4 ↗
Sep 17	Sep 16	Jon Faiz KayyemDirector	Director (ind.)	▲ BUY	5,000	100.00	$500K	+1.2%	Form 4 ↗
Sep 15	Sep 11	Kimberly ManhardDirector	Director (ind.)	▼ SELL	500	111.78	$56K	−5.6%	Form 4 ↗
Sep 15	Sep 14	Kimberly ManhardDirector	Director (ind.)	▼ SELL	500	110.26	$55K	−5.9%	Form 4 ↗
Sep 15	Sep 15	Kimberly ManhardDirector	Director (ind.)	▼ SELL	500	105.05	$53K	−6.3%	Form 4 ↗
Sep 10	Sep 9	Kimberly ManhardDirector	Director (ind.)	▼ SELL	500	115.80	$58K	−5.3%	Form 4 ↗
Sep 10	Sep 8	Kimberly ManhardDirector	Director (ind.)	▼ SELL	500	115.14	$58K	−5.0%	Form 4 ↗

Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings

All 13 INBX insider trades →

Insiders who traded in the past year

Insider	Role	Buys	Bought	Sells	Sold	Latest
Mark Lappe	CEO	4	$4.49M	0	$0	Oct 14, 2026
Jon Faiz Kayyem	Director	3	$1.57M	0	$0	Sep 23, 2026
Kimberly Manhard	Director	0	$0	5	$279K	Sep 15, 2026
Douglas Forsyth	Director	1	$287K	0	$0	Sep 8, 2026

Tracked funds that report INBX

From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.

Fund	Quarter	Shares	Value	% of portfolio	Change
Viking Global Investors	Q2 2026	1,123,929	$106.5M	0.30%	▼ −21.8%
Renaissance Technologies	Q2 2026	62,201	$5.89M	0.01%	▲ +23.9%

Source: SEC Form 13F-HR filings, retrieved Oct 28, 2026. How we read filings

Reading these numbers

Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →