LA
QUMSU

Linden Advisors’s Quantumsphere Acquisition Corp Units QUMSU Stock Holding History

Linden Advisors’s Portfolio QUMSU Stock Details QUMSU Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-400,000
Closed -$4.05M – 500
2025
Q3 		$4.05M Buy
+400,000
New +$4.02M 0.03% 227

Other funds holding QUMSU

RCM
Rivernorth Capital Management West Palm Beach, Florida $2B AUM 0.66% 1-Year Est. Return
PAMP
Polar Asset Management Partners Toronto, Ontario, Canada $5.01B AUM 35.27% 1-Year Est. Return
WCMNY
Westchester Capital Management (New York) Valhalla, New York $2.21B AUM 26.02% 1-Year Est. Return
GCIA
Gabelli & Co Investment Advisers Rye, New York $674M AUM 64.52% 1-Year Est. Return
GF
Gabelli Funds Rye, New York $14.8B AUM 32.24% 1-Year Est. Return
HF
HRT Financial New York $40.1B AUM 58.22% 1-Year Est. Return
CS
Clear Street New York $24.6B AUM 56.26% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Linden Advisors's QUMSU Position: Q4 2025 in Review

Linden Advisors sold out of Quantumsphere Acquisition Corp Units (QUMSU) in Q4 2025, closing a stake of 400,000 shares — an estimated $4.05M sold.

Linden Advisors first reported a position in QUMSU in Q3 2025 and held it in 1 quarter. The position peaked at $4.05M in Q3 2025. 9 funds tracked by Wall St. Rank hold QUMSU as of Q4 2025.

  • Linden Advisors reported no remaining Quantumsphere Acquisition Corp Units position as of Q4 2025 after selling out during the quarter.
  • Linden Advisors sold 400,000 Quantumsphere Acquisition Corp Units shares in Q4 2025, an estimated $4.05M.
  • Linden Advisors first reported a position in Quantumsphere Acquisition Corp Units in Q3 2025 and held it in 1 quarter.
  • Linden Advisors's Quantumsphere Acquisition Corp Units position peaked at $4.05M in Q3 2025.
  • 9 funds tracked by Wall St. Rank held Quantumsphere Acquisition Corp Units as of Q4 2025.

Based on Linden Advisors's 13F filing for Q4 2025, filed 17 Feb 2026.