Quantum Corp (QMCO)

CUSIP: 747906600 | NYSE | Technology · Computer Hardware | Micro Cap | 122 institutional holders

Compare Detailed Historical Funds Options 13D/13G Peers Targeting Trading Summary Profile

Beneficial Ownership — 13D / 13G

5%+ stakes reported outside the quarterly cycle. A 13D is due within five business days of the event below, so these figures lead the holders table until the filer's next 13F catches up to them.

Holder	Shares	% of Class	Change	Event Date	vs 13F
13GAlyeska Investment Group, L.P.	2,653,928	6.7%	New 5%+ stake	Jun 30, 2026	No 13F filer matched
13GTwo Seas Capital LP	2,488,535	6.3%	New 5%+ stake	Jun 30, 2026

Institutional Holders — Q3 2026

Sort by

Two Seas Capital LP1,490,992

0.5% of portfolio$47.3M

Geode Capital Management, LLC305,156

0.0% of portfolio$9.7M

Barclays PLC31,257

0.0% of portfolio$991.5K

Y-Intercept (Hong Kong) Ltd21,886

0.0% of portfolio$694.2K

Cambridge Investment Research Advisors, Inc.14,126

0.0% of portfolio$448

Flagship Harbor Advisors, LLC11,004

0.0% of portfolio$349.0K

Jefferies Financial Group Inc.7,700

0.0% of portfolio$244.2K

LPL Financial LLC7,273

0.0% of portfolio$230.7K

Calamos Advisors LLC6,770

0.0% of portfolio$214.7K

True Private Wealth Advisors6,645

0.0% of portfolio$210.8K

Bank of New York Mellon Corp6,539

0.0% of portfolio$207.4K

State of Alaska, Department of Revenue1,936

0.0% of portfolio$61

SBI Securities Co., Ltd.1,324

0.0% of portfolio$42.0K

Signaturefd, LLC696

0.0% of portfolio$22.1K

Carolina Wealth Advisors, LLC416

0.0% of portfolio$13.2K

Fifth Third Bancorp273

0.0% of portfolio$8.7K

Citigroup Inc208

0.0% of portfolio$6.6K

Caitong International Asset Management Co., Ltd121

0.0% of portfolio$3.8K

Blue Bell Private Wealth Management, LLC34

0.0% of portfolio$1.1K

GK Wealth Management LLC13

0.0% of portfolio$412

Cassaday & Co Wealth Management LLC7

0.0% of portfolio$223

Farther Finance Advisors, LLC4

0.0% of portfolio$127

				Style	Turnover	Location	Filed
Two Seas Capital LP	1,490,992	$47.3M	0.5%	Momentum	Medium	Rye, NY	2026-10-06
Geode Capital Management, LLC	305,156	$9.7M	0.0%	Index	Very Low	Boston, MA	2026-11-06
Barclays PLC	31,257	$991.5K	0.0%	Core	Medium	London, United Kingdom	2026-11-06
Y-Intercept (Hong Kong) Ltd	21,886	$694.2K	0.0%	Value	Very High	Hong Kong, South Korea	2026-10-16
Cambridge Investment Research Advisors, Inc.	14,126	$448	0.0%	ETF	Low	Fairfield, IA	2026-11-02
Flagship Harbor Advisors, LLC	11,004	$349.0K	0.0%	ETF	Medium	Boston, MA	2026-10-26
Jefferies Financial Group Inc.	7,700	$244.2K	0.0%	Core	Very High	New York, NY	2026-11-05
LPL Financial LLC	7,273	$230.7K	0.0%	Index	Very Low	Fort Mill, SC	2026-11-06
Calamos Advisors LLC	6,770	$214.7K	0.0%	Growth	Medium	Naperville, IL	2026-11-02
True Private Wealth Advisors	6,645	$210.8K	0.0%	ETF	Medium	Salem, OR	2026-10-19
Bank of New York Mellon Corp	6,539	$207.4K	0.0%	Core	Low	New York, NY	2026-11-05
State of Alaska, Department of Revenue	1,936	$61	0.0%	Core	Very Low	Juneau, AK	2026-10-15
SBI Securities Co., Ltd.	1,324	$42.0K	0.0%	Agg Growth	Low	Tokyo, Mexico	2026-10-22
Signaturefd, LLC	696	$22.1K	0.0%	Index	Low	Atlanta, GA	2026-10-23
Carolina Wealth Advisors, LLC	416	$13.2K	0.0%	Yield	High	Myrtle Beach, SC	2026-10-23
Fifth Third Bancorp	273	$8.7K	0.0%	Index	Very Low	Cincinnati, OH	2026-11-05
Citigroup Inc	208	$6.6K	0.0%	Core	Medium	New York, NY	2026-11-04
Caitong International Asset Management Co., Ltd	121	$3.8K	0.0%	Growth	Very High	Hong Kong, South Korea	2026-10-29
Blue Bell Private Wealth Management, LLC	34	$1.1K	0.0%	Yield	Very Low	Blue Bell, PA	2026-10-29
GK Wealth Management LLC	13	$412	0.0%	GARP	Very High	Reno, NV	2026-10-09
Cassaday & Co Wealth Management LLC	7	$223	0.0%	ETF	Very Low	Mclean, VA	2026-10-27
Farther Finance Advisors, LLC	4	$127	0.0%	Index	Low	San Francisco, CA	2026-10-08