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INBX — Inhibrx Biosciences, Inc.

Materials · Biological Products, (No Diagnostic Substances) · Nasdaq

CIK 0002007919 · FYE 1231 · All Form 4 filings on EDGAR ↗

3Insiders filing

8Transactions

+$3.5MReported buys

−$0Reported sells

1Cluster events

Window in data: 2026-09-08 → 2026-09-08 · Data as of 2026-09-09

Cluster membership

Week	Window	Tier	Dir	Insiders	Total value
2026-W37	2026-09-08 → 2026-09-08	WATCH	+ buy	3	$3.5M

Insiders

Insider	Role	Txns	Reported value
Lappe Mark	Chief Executive Officer	6	$2.6M
Kayyem Jon Faiz	Director	1	$568k
FORSYTH DOUGLAS	Director	1	$287k

Transaction history

Filing date	Trade date	Ticker	Insider	Type	Shares	Price	Value	Cluster
2026-09-08	2026-09-08	INBX	Kayyem Jon Faiz Director	P	5,000	$113.52	+$568k	✓ Cluster clu-69cd512dc4cf
2026-09-08	2026-09-08	INBX	Lappe Mark Chief Executive Officer	P	5,895	$99.29	+$585k	✓ Cluster clu-69cd512dc4cf
2026-09-08	2026-09-08	INBX	Lappe Mark Chief Executive Officer	P	6,605	$100.64	+$665k	✓ Cluster clu-69cd512dc4cf
2026-09-08	2026-09-08	INBX	Lappe Mark Chief Executive Officer	P	1,100	$107.12	+$118k	✓ Cluster clu-69cd512dc4cf
2026-09-08	2026-09-08	INBX	Lappe Mark Chief Executive Officer	P	500	$108.23	+$54k	✓ Cluster clu-69cd512dc4cf
2026-09-08	2026-09-08	INBX	Lappe Mark Chief Executive Officer	P	1,219	$111.88	+$136k	✓ Cluster clu-69cd512dc4cf
2026-09-08	2026-09-08	INBX	Lappe Mark Chief Executive Officer	P	9,681	$112.28	+$1.1M	✓ Cluster clu-69cd512dc4cf
2026-09-08	2026-09-08	INBX	FORSYTH DOUGLAS Director	P	2,500	$114.65	+$287k	✓ Cluster clu-69cd512dc4cf

Known data limitations

Form 4 lag: insiders have 2 business days to file after a trade (weekends and holidays extend this), and this site re-ingests once daily — a transaction can appear here roughly three business days after it happened.
13F lag: quarterly 13F-HR holdings cover the prior quarter-end and are due 45 days after it — every institutional position shown here is at least 45 days old by construction, often more.
CUSIP→ticker gaps: 13F positions are reported by CUSIP; some holdings cannot be matched to a current ticker (delistings, corporate actions, thin metadata) and appear without one or are omitted from ticker-level views.
EDGAR timing variability: institutions file at different hours and days within their windows; amended filings (4/A, 13F-HR/A) can restate earlier periods, so historical aggregates may change between batches.

Insider Atlas is a descriptive research site, not investment advice — see the methodology for the full provenance chain.