JO
QUMSU

John Overdeck’s Quantumsphere Acquisition Corp Units QUMSU Stock Holding History

John Overdeck’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
-222,490
Closed -$2.25M – 4527
2025
Q3 		$2.25M Buy
+222,490
New +$2.24M ﹤0.01% 2044

Other funds holding QUMSU

RCM
Rivernorth Capital Management West Palm Beach, Florida $2.1B AUM 2.15% 1-Year Est. Return
PAMP
Polar Asset Management Partners Toronto, Ontario, Canada $6.07B AUM 34.81% 1-Year Est. Return
WCMNY
Westchester Capital Management (New York) Valhalla, New York $2.04B AUM 31.03% 1-Year Est. Return
GCIA
Gabelli & Co Investment Advisers Rye, New York $688M AUM 63.39% 1-Year Est. Return
GF
Gabelli Funds Rye, New York $15.7B AUM 36.4% 1-Year Est. Return
HF
HRT Financial New York $54.8B AUM 81.03% 1-Year Est. Return
CS
Clear Street New York $39.5B AUM 124.03% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

John Overdeck's QUMSU Position: Q4 2025 in Review

John Overdeck sold out of Quantumsphere Acquisition Corp Units (QUMSU) in Q4 2025, closing a stake of 222,490 shares — an estimated $2.25M sold.

John Overdeck first reported a position in QUMSU in Q3 2025 and held it in 1 quarter. The position peaked at $2.25M in Q3 2025. 9 funds tracked by Wall St. Rank hold QUMSU as of Q4 2025.

  • John Overdeck reported no remaining Quantumsphere Acquisition Corp Units position as of Q4 2025 after selling out during the quarter.
  • John Overdeck sold 222,490 Quantumsphere Acquisition Corp Units shares in Q4 2025, an estimated $2.25M.
  • John Overdeck first reported a position in Quantumsphere Acquisition Corp Units in Q3 2025 and held it in 1 quarter.
  • John Overdeck's Quantumsphere Acquisition Corp Units position peaked at $2.25M in Q3 2025.
  • 9 funds tracked by Wall St. Rank held Quantumsphere Acquisition Corp Units as of Q4 2025.

Based on Two Sigma Investments's 13F filing for Q4 2025, filed 17 Feb 2026.