INBX

Inhibrx Biosciences Inc.$71.78-3.40 (-4.62%)

Prev Close$73.65·MCap$1.06B·P/E—·Vol357.2K·Yield0.01%

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Buys (12M)

$6.13M

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Sells (12M)

$279.0K

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Net Activity

Net Buyer

$5.85M

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Active Insiders

last 12 mo

Over the past 12 months, insider activity at Inhibrx Biosciences Inc. (INBX) has been dominated by buying, with 7 insider purchases totaling $6.13M and 2 insider sales totaling $279.0K. The most recent insider transaction was by Lappe Mark (director, officer: Chief Executive Officer), who purchased $632.7K worth of shares on Oct 14, 2026. Inhibrx Biosciences Inc. operates in the Healthcare sector, within the Biotechnology industry, with a market cap of $1.06B.

INBX Insider Trading Activity

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Oct 14, 2026	Lappe Mark	director, officer: Chief Executive Officer	Buy	7,470	$84.70	$632.7K	745,488
Sep 28, 2026	Lappe Mark	director, officer: Chief Executive Officer	Buy	10,000	$99.88	$998.8K	740,548
Sep 23, 2026	Kayyem Jon Faiz	director	Buy	5,000	$100.00	$500.0K	434,360
Sep 17, 2026	Kayyem Jon Faiz	director	Buy	5,000	$100.00	$500.0K	429,360
Sep 15, 2026	MANHARD KIMBERLY	director	Sell	1,500	$109.03	$163.5K	8,500
Sep 10, 2026	MANHARD KIMBERLY	director	Sell	1,000	$115.47	$115.5K	9,500
Sep 8, 2026	FORSYTH DOUGLAS	director	Buy	2,500	$114.65	$286.6K	227,064
Sep 8, 2026	Kayyem Jon Faiz	director	Buy	5,000	$113.52	$567.6K	424,360
Sep 8, 2026	Lappe Mark	director, officer: Chief Executive Officer	Buy	25,000	$105.82	$2.65M	730,548
Nov 22, 2024	Kayyem Jon Faiz	Director	Buy	53,593	$14.21	$761.8K	69,843+330%
Oct 7, 2024	Vuori Kristiina MD	Director	Buy	6,667	$15.00	$100.0K	20,443+48%
Sep 16, 2024	Lappe Mark	Chief Executive Officer	Buy	40,000	$15.73	$629.1K	705,548
Sep 12, 2024	Vuori Kristiina MD	Director	Buy	6,636	$15.07	$100.0K	13,776+93%
Sep 10, 2024	Lappe Mark	Chief Executive Officer	Buy	44,000	$15.25	$671.1K	665,548
Sep 3, 2024	Lappe Mark	Chief Executive Officer	Buy	40,000	$14.92	$596.8K	165,000+32%
Sep 3, 2024	Vuori Kristiina MD	Director	Buy	7,140	$14.00	$100.0K	7,140
Aug 30, 2024	MANHARD KIMBERLY	Director	Buy	10,000	$13.98	$139.8K	10,000
Aug 26, 2024	FORSYTH DOUGLAS	Director	Buy	75,000	$13.83	$1.04M0.5% OS	224,564+50%
Aug 22, 2024	Lappe Mark	Chief Executive Officer	Buy	40,000	$12.96	$518.3K	54,865+269%
Jun 7, 2024	Kayyem Jon Faiz	Director	Buy	57,549	$17.32	$997.0K	1,150,410
Jun 4, 2024	Kayyem Jon Faiz	Director	Buy	286,786	$17.18	$4.93M2.0% OS	1,092,861+36%

INBX Insider Buying Activity

The following table shows recent insider purchases of Inhibrx Biosciences Inc. (INBX) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Oct 14, 2026	Lappe Mark	director, officer: Chief Executive Officer	Buy	7,470	$84.70	$632.7K	745,488
Sep 28, 2026	Lappe Mark	director, officer: Chief Executive Officer	Buy	10,000	$99.88	$998.8K	740,548
Sep 23, 2026	Kayyem Jon Faiz	director	Buy	5,000	$100.00	$500.0K	434,360
Sep 17, 2026	Kayyem Jon Faiz	director	Buy	5,000	$100.00	$500.0K	429,360
Sep 8, 2026	FORSYTH DOUGLAS	director	Buy	2,500	$114.65	$286.6K	227,064
Sep 8, 2026	Kayyem Jon Faiz	director	Buy	5,000	$113.52	$567.6K	424,360
Sep 8, 2026	Lappe Mark	director, officer: Chief Executive Officer	Buy	25,000	$105.82	$2.65M	730,548
Nov 22, 2024	Kayyem Jon Faiz	Director	Buy	53,593	$14.21	$761.8K	69,843+330%
Oct 7, 2024	Vuori Kristiina MD	Director	Buy	6,667	$15.00	$100.0K	20,443+48%
Sep 16, 2024	Lappe Mark	Chief Executive Officer	Buy	40,000	$15.73	$629.1K	705,548
Sep 12, 2024	Vuori Kristiina MD	Director	Buy	6,636	$15.07	$100.0K	13,776+93%
Sep 10, 2024	Lappe Mark	Chief Executive Officer	Buy	44,000	$15.25	$671.1K	665,548
Sep 3, 2024	Lappe Mark	Chief Executive Officer	Buy	40,000	$14.92	$596.8K	165,000+32%
Sep 3, 2024	Vuori Kristiina MD	Director	Buy	7,140	$14.00	$100.0K	7,140
Aug 30, 2024	MANHARD KIMBERLY	Director	Buy	10,000	$13.98	$139.8K	10,000
Aug 26, 2024	FORSYTH DOUGLAS	Director	Buy	75,000	$13.83	$1.04M0.5% OS	224,564+50%
Aug 22, 2024	Lappe Mark	Chief Executive Officer	Buy	40,000	$12.96	$518.3K	54,865+269%
Jun 7, 2024	Kayyem Jon Faiz	Director	Buy	57,549	$17.32	$997.0K	1,150,410
Jun 4, 2024	Kayyem Jon Faiz	Director	Buy	286,786	$17.18	$4.93M2.0% OS	1,092,861+36%