Gabelli & Co Investment Advisers’s Quantumsphere Acquisition Corp Units QUMSU Stock Holding History

Gabelli & Co Investment Advisers’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
2026 Q2	$699K	Hold	67,700	–	–	0.1%	157
2026 Q1	$699K	Hold	67,700	–	–	0.1%	148
2025 Q4	$689K	Hold	67,700	–	–	0.1%	139
2025 Q3	$686K	Buy	+67,700	New	+$680K	0.11%	137

Other funds holding QUMSU

Gabelli Funds Rye, New York $15.7B AUM 36.4% 1-Year Est. Return

HRT Financial New York $54.8B AUM 81.03% 1-Year Est. Return

Clear Street New York $39.5B AUM 124.03% 1-Year Est. Return

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

Gabelli & Co Investment Advisers's QUMSU Position: Q2 2026 in Review

Gabelli & Co Investment Advisers held its Quantumsphere Acquisition Corp Units (QUMSU) position steady in Q2 2026 at 67,700 shares worth $699K. The position accounts for 0.1% of the portfolio, ranked #157.

Gabelli & Co Investment Advisers first reported a position in QUMSU in Q3 2025 and has held it in 4 quarters since. 6 funds tracked by Wall St. Rank hold QUMSU as of Q2 2026.

Gabelli & Co Investment Advisers held 67,700 shares of Quantumsphere Acquisition Corp Units worth $699K as of Q2 2026.
Gabelli & Co Investment Advisers left its Quantumsphere Acquisition Corp Units share count unchanged in Q2 2026.
Quantumsphere Acquisition Corp Units made up 0.1% of Gabelli & Co Investment Advisers's portfolio in Q2 2026, its #157 holding.
Gabelli & Co Investment Advisers first reported a position in Quantumsphere Acquisition Corp Units in Q3 2025 and has held it in 4 quarters since.
6 funds tracked by Wall St. Rank held Quantumsphere Acquisition Corp Units as of Q2 2026.

Based on Gabelli & Co Investment Advisers's 13F filing for Q2 2026, filed 12 Aug 2026.