Inhibrx Biosciences ($INBX) Insider Trading & Smart Money Activity

Inhibrx Biosciences, Inc. · Biotechnology · Latest filing Oct 14, 2026

Inhibrx Biosciences, Inc. ($INBX) has 4 insider trades and 2 13F position changes on file. In the last 12 months on the open market, 2 insiders bought ($2.35M) and no insider sold, net +$2.35M.

Insider buyers (12 mo): 2
Insider sellers (12 mo): 0
Net insider $ (12 mo): +$2.35M
Congress trades (12 mo): 0
13F moves on file: 2
Analyst ratings on file: 0

INBX insider buying and selling by quarter

Quarter	Insider buys	Congress buys / sales	13F added / cut
Q1 2026	0	0 / 0	0 / 0
Q2 2026	0	0 / 0	0 / 2
Q3 2026	3 · $1.50M	0 / 0	0 / 0
Q4 2026	1 · $848.98K	0 / 0	0 / 0

Insider buys and sales count open-market trades only (Form 4 codes P and S). Grants, option exercises and tax withholding are left out.

All INBX insider, congress, 13F and analyst activity

Date	Source	Who	Action	Shares	Value / amount	1W	1M	Story
Oct 14, 2026	Insider	Lappe MarkChief Executive Officer	Buy (Open-market buy)	10.04K sh	$848.98K			Read
Sep 28, 2026	Insider	Lappe MarkChief Executive Officer	Buy (Open-market buy)	4.50K sh	$453.43K	-7.0%		—
Sep 25, 2026	Insider	Lappe MarkChief Executive Officer	Buy (Open-market buy)	5.50K sh	$545.36K	-2.6%		—
Sep 23, 2026	Insider	Kayyem Jon FaizDirector	Buy (Open-market buy)	5K sh	$500K	-0.2%		—
May 12, 2026	13F	Belvedere Trading	Sold out	-7.40K sh		+0.8%	-13.9%	—
May 12, 2026	13F	Belvedere Trading	Sold out	-7.40K sh		+0.8%	-13.9%	—

1W / 1M / 6M = how INBX moved from the trade or filing date.

Insider trading in INBX: who is buying and selling

Insider	Role	Trades	Open-market net	Shares held	Last trade
Lappe Mark	Chief Executive Officer	3	+$1.85M		Oct 14, 2026
Kayyem Jon Faiz	Director	1	+$500K		Sep 23, 2026

Institutions moving INBX (13F)

Belvedere Trading2

Frequently asked questions

Are INBX insiders buying or selling?

Over the last 12 months 2 insiders made 4 open-market purchases worth $2.35M and 0 insiders made 0 open-market sales worth $0, a net +$2.35M.

What is the latest insider trade in INBX?

Lappe Mark, Chief Executive Officer filed a buy (open-market buy) of 10.04K sh worth $848.98K on Oct 14, 2026.

Which institutions changed their INBX positions?

Recent 13F filers moving the stock include Belvedere Trading.

Other biotechnology stocks

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Data comes from public SEC Form 4 and 13F filings and STOCK Act disclosures. Dates are the trade or filing date reported. This page is for research only and is not investment advice.

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