Mark P. Lappe owns 6.59% of Inhibrx Biosciences
970,453 shares as of the October 14, 2026 filing, worth $87.2M at the latest close.
INBX · $1.3B market cap · Founder-ledGet an email when Mark P. Lappe’s stake moves.
Free.
The stake
6.59%
worth $87.2M at the latest close
Stake rank
#478
by dollar value of the stake
Last sale
None
no sales since 2024
Last buy
5 days ago
Oct 14, 2026 · $848,977
Mark P. Lappe owns 6.59% of Inhibrx Biosciences, Inc.: 970,453 of 14,717,660 shares, worth about $87.2M at the 2026-10-16 close. The stake has moved from 0.00% in 2024 to 6.59% on 2026-10-14, across 0 sales and 7 purchases that moved it since 2016. The last trade that moved it was a discretionary purchase of $848,977 on 2026-10-14.
How the stake is held
as of the Oct 14, 2026 filing
SHARES
OF THE STAKE
COMMON STOCK · stated Oct 14, 2026 · Form 4 ↗
HELD INDIRECTLY · 3 VEHICLES
970,453
100.0%
By the Lappe Family Trust
745,588
76.8%
By Lappe Descendants' Trust
170,000
17.5%
The Mark Paul Lappe Roth IRA
54,865
5.7%
THE STAKE
970,453
6.59%