Marshall Wace’s OS Therapies Inc OSTX Stock Holding History

Marshall Wace’s Portfolio OSTX Stock Details OSTX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	–	Sell	-109,949	Closed	-$154K	–	3747
2025 Q4	$154K	Sell	109,949 -88,603	-45%	-$160K	﹤0.01%	2646
2025 Q3	$389K	Buy	+198,552	New	+$393K	﹤0.01%	2324

Other funds holding OSTX

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Susquehanna International Group Bala Cynwyd, Pennsylvania $893B AUM 36.07% 1-Year Est. Return

CM Management Gulf Breeze, Florida $120M AUM 37.12% 1-Year Est. Return

UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

HFS

Howard Financial Services Dallas, Texas $1B AUM 20.02% 1-Year Est. Return

VFT

Vanguard Fiduciary Trust Malvern, Pennsylvania $396B AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Marshall Wace's OSTX Position: Q1 2026 in Review

Marshall Wace sold out of OS Therapies Inc (OSTX) in Q1 2026, closing a stake of 109,949 shares — an estimated $154K sold.

Marshall Wace first reported a position in OSTX in Q3 2025 and held it in 2 quarters. The position peaked at $389K in Q3 2025. 29 funds tracked by Wall St. Rank hold OSTX as of Q1 2026.

Marshall Wace reported no remaining OS Therapies Inc position as of Q1 2026 after selling out during the quarter.
Marshall Wace sold 109,949 OS Therapies Inc shares in Q1 2026, an estimated $154K.
Marshall Wace first reported a position in OS Therapies Inc in Q3 2025 and held it in 2 quarters.
Marshall Wace's OS Therapies Inc position peaked at $389K in Q3 2025.
29 funds tracked by Wall St. Rank held OS Therapies Inc as of Q1 2026.

Based on Marshall Wace's 13F filing for Q1 2026, filed 15 May 2026.