Quantum Corporation (QMCO)
Nasdaq: QMCO · Computer Storage Devices · San Jose, CA · filing with the SEC since 1994
Who owns Quantum Corporation
As filed with the SECHolders of 5% or more
4
Dialectic Technology SPV LLC holds 40% of Common Stock, as its SCHEDULE 13D/A filed Jun 8, 2026 says.
Directors and officers
11
report now, of 46 people on the record since 2006. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 4 named at left.
Holders of 5% or moreshare of the class, as filed
Dialectic Technology SPV LLC
SCHEDULE 13D/A · filed Jun 8, 2026 · Common Stock · 41.4% in Jan 12, 2026
Alyeska Investment Group, L.P.
SCHEDULE 13G · filed Aug 14, 2026 · Common Stock, $0.01 par value per share
Two Seas Capital LP
SCHEDULE 13G · filed Aug 14, 2026 · Common Stock, $0.01 par value per share
Oaktree Capital Management LP
SCHEDULE 13G · filed Aug 10, 2026 · Common Stock, $0.01 par value per share
The Vanguard Group
SCHEDULE 13G/A · filed Jan 31, 2025 · Common Stock · reported falling below 5%
Blue Torch Capital LP
SCHEDULE 13D/A · filed Feb 21, 2025 · Common stock, $0.01 par value per share · reported falling below 5%, from 7.7% in Jan 6, 2025
Long Focus Capital Management, LLC
SCHEDULE 13G/A · filed May 15, 2025 · Common Stock · reported falling below 5%
ADK Soho Fund LP
SCHEDULE 13G/A · filed May 8, 2025 · Common Stock, par value $0.01 per share · reported falling below 5%
Pacific Investment Management Company LLC
SCHEDULE 13D/A · filed Apr 17, 2025 · Common Stock, par value $0.01 per share · reported falling below 5%, from 14.7% in Mar 31, 2025
What QMCO reports owning in othersstakes of 5% or more, and other ties
31 subsidiaries in 17 countries, from the list filed with the 10-K filed Aug 26, 2025.
Insider tradesForm 4
4sales
0purchases
0sales on a scheduled plan
3people selling
$100,000sold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Oct 5, 2025 to Oct 5, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Oct 5, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window3 of 66 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Meyrath Hugues | President & CEO | 1 | $100,000 | 0 | 0 | $0 |
| Craythorne Anthony | Chief Revenue Officer | 1 | $0 | 0 | 0 | $0 |
| Nash Laura A. | Chief Accounting Officer | 2 | $0 | 0 | 0 | $0 |