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QMCO · NASDAQ · Computer Hardware

Quantum (QMCO)

Builds storage, archive, protection, and workflow systems for unstructured data.

$22.57

Pre-market−0.19 (−0.84%)

At close$22.76(−5.83%)

Watchlist

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Breakdown13F · 13D/G · Form 4

Institutions37 holders · as of Mar 31, 2026	4.09%	1.61M shares
Insiders16 holders · as of Aug 5, 2026	37.57%	14.81M shares
Strategic holders2 holders · as of Feb 7, 2020	0.96%	378.6K shares
Otherremainder	57.38%	22.61M shares

39.41M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
John FichthornInsiderdirector, 10 percent owner	35.86%	14.13M	Form 4filed Jun 8, 2026 ↗
Alyeska Investment Group, L.P.Institution	6.73%	2.65M	13Gfiled Aug 14, 2026 ↗
Two Seas Capital LPInstitution	6.31%	2.49M	13Gfiled Aug 14, 2026 ↗
Vanguard Capital Management LLCInstitution	1.37%	539,275	13Fas of Mar 31, 2026
BlackRock, Inc.Institution	0.55%	217,532	13Fas of Mar 31, 2026
Management Company LLCStrategic	0.55%	215,473	13Gfiled Jan 10, 2019 ↗
The TCW Group, Inc., on behalf of the TCW Business UnitStrategic	0.41%	163,115	13G/Afiled Feb 7, 2020 ↗
Eric Singer¹Insider10 percent owner	0.41%	160,757	13D/Afiled Jan 9, 2020 ↗
Geode Capital Management, LLCInstitution	0.40%	159,179	13Fas of Mar 31, 2026
Institution	0.31%	124,086	13Fas of Mar 31, 2026
Hugues MeyrathInsiderdirector, officer: President & CEO	0.30%	118,468	Form 4filed Jul 7, 2026 ↗
180 Degree Capital Corp.Institution	0.28%	112,298	13Gfiled Jan 29, 2021 ↗
James J. LernerInsiderdirector, officer: President & CEO	0.28%	110,848	Form 4filed Apr 23, 2025 ↗
UBS Group AGInstitution	0.25%	99,068	13Fas of Mar 31, 2026
Vanguard Fiduciary Trust CoInstitution	0.20%	80,263	13Fas of Mar 31, 2026
State Street CorpInstitution	0.18%	72,814	13Fas of Mar 31, 2026
Sona Asset Management (US) LLCInstitution	0.18%	70,092	13Fas of Mar 31, 2026
Yue Zhou WhiteInsiderdirector	0.10%	41,139	Form 4filed Jan 5, 2026 ↗
Don JaworksiInsiderdirector	0.10%	39,675	Form 4filed Jan 5, 2026 ↗
Marshall Wace, LLPInstitution	0.10%	37,528	13Fas of Mar 31, 2026
Kenneth P. GianellaInsiderofficer: Chief Financial Officer	0.08%	32,402	Form 4filed Feb 5, 2025 ↗
Northern Trust CorpInstitution	0.07%	28,762	13Fas of Mar 31, 2026
Brian E. CabreraInsiderofficer: SVP Chief Admin Ofcr & Secy	0.07%	28,736	Form 4filed Apr 23, 2025 ↗
John R. TracyInsiderdirector	0.07%	27,000	Form 4filed Jan 5, 2026 ↗
William Hillis WhiteInsiderofficer: Chief Financial Officer	0.06%	25,000	Form 4filed Mar 4, 2026 ↗

Eric Singer's transaction reports restate only vehicles that traded; the 2020 ownership statement (160.8K) is used instead.

13F — a manager's quarterly holdings · 13D/13G — an ownership statement filed at 5% or more · Form 4 — an insider's transaction report

Institutions13F, as of Mar 31, 2026

37 holders · 1.61M shares · 10 new positions · 19 increased · 11 reduced · 12 closed

Holder	Shares	% outstanding	Chg q/q	Filed
Vanguard Capital Management LLC	539.3K	1.37%	+539.3Knew	May 15, 2026
BlackRock, Inc.	217.5K	0.55%	−3.2K	May 13, 2026
Geode Capital Management, LLC	159.2K	0.40%	+2.3K	May 15, 2026
	124.1K	0.31%	+54.7K	May 13, 2026
UBS Group AG	99.1K	0.25%	−66.8K	May 5, 2026
Vanguard Fiduciary Trust Co	80.3K	0.20%	+80.3Knew	May 8, 2026
State Street Corp	72.8K	0.18%	−17.9K	May 15, 2026
Sona Asset Management (US) LLC	70.1K	0.18%	+70.1Knew	May 15, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
John Fichthornincl. Dialectic Technology SPV LLC, Dialectic Technology Manager LLC	40.00%	16.89M	13D	Jun 8, 2026 ↗
Alyeska Investment Group, L.P.	6.74%	2.65M	13G	Aug 14, 2026 ↗
Two Seas Capital LP	6.30%	2.49M	13G	Aug 14, 2026 ↗

Insider tradesForm 4

Latest trades

Date	Insider	Type	Shares	Avg price	Owned after
Aug 3, 2026	Anthony Craythorneofficer: Chief Revenue Officer	Sale	1,478	$10.73	13,522
Jul 2, 2026	Hugues Meyrathdirector, officer: President & CEO	Sale	6,232	$10.51	118,468
Jul 2, 2026	Laura A. Nashofficer: Chief Accounting Officer	Sale	260	$10.51	10,770
Apr 2, 2026	Laura A. Nashofficer: Chief Accounting Officer	Sale	109	$5.44	11,030
Oct 2, 2025	Laura A. Nashofficer: Chief Accounting Officer	Sale	611	$10.86	11,139
Oct 1, 2025	Laura A. Nashofficer: Chief Accounting Officer	Sale	118	$9.91	11,750
Oct 2, 2025	Hugues Meyrathdirector, officer: President & CEO	Sale	2,975	$10.86	24,700
Sep 12, 2025	Laura A. Nashofficer: Chief Accounting Officer	Sale	284	$7.40	11,368

CongressHouse and Senate disclosures

Not reported.