Marshall Wace
OSTX

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
Q2 		$191K Buy
+100,640
New +$169K ﹤0.01% 2845
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

Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
CM
CM Management Gulf Breeze, Florida $157M AUM 60.08% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
HFS
Howard Financial Services Dallas, Texas $1B AUM 20.02% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Fiduciary Trust
Vanguard Fiduciary Trust Malvern, Pennsylvania $454B AUM
State Street
State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return
HighTower Advisors
HighTower Advisors Chicago, Illinois $104B AUM 28.3% 1-Year Est. Return
Northern Trust
Northern Trust Chicago, Illinois $860B AUM 41.15% 1-Year Est. Return
BPA
Beacon Pointe Advisors Newport Beach, California $21.5B AUM 23.65% 1-Year Est. Return

Marshall Wace's OSTX Position: Q2 2026 in Review

Marshall Wace opened a new position in OS Therapies Inc (OSTX) in Q2 2026: 100,640 shares worth $191K. The stake represents ﹤0.01% of the portfolio and ranks #2845 among its holdings. This is a return to the name: Marshall Wace previously reported a position in OSTX as recently as Q4 2025.

Marshall Wace first reported a position in OSTX in Q3 2025 and has held it in 3 quarters since. The position peaked at $389K in Q3 2025. 29 funds tracked by Wall St. Rank hold OSTX as of Q2 2026.

  • Marshall Wace held 100,640 shares of OS Therapies Inc worth $191K as of Q2 2026.
  • OS Therapies Inc was a new Marshall Wace position in Q2 2026.
  • OS Therapies Inc made up ﹤0.01% of Marshall Wace's portfolio in Q2 2026, its #2845 holding.
  • Marshall Wace first reported a position in OS Therapies Inc in Q3 2025 and has held it in 3 quarters since.
  • 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 Q2 2026.

Based on Marshall Wace's 13F filing for Q2 2026, filed 13 Aug 2026.