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$QMCO
$18.69 +$1.07 (6.07%) Close

Ownership

13F as of Q2 2026 · 39.4M shares outstanding

Who owns QMCO?

By type of holder
Institutions 36.4% Insiders 63.6% Everyone else 0.0%
Concentration Top 10 holders own 156.6%
John Fichthorn 42.9% · Dialectic Technology SPV LLC 42.8%
Institutional ownership
36.4%
+32.3 pts vs last qtr
Institutional holders
58
+21 vs last qtr
Net shares bought
+12.7M
by institutions in Q2 2026
New / sold out
29 / 8
positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026
  • Alyeska Investment Group, L.P. NEW +2.7M
  • Two Seas Capital LP NEW +2.5M

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Biggest sellers in Q2 2026
  • UBS Group AG −53.0K
  • Cygnus Capital Advisors, LLC −49.8K

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Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Quantum Corp in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2015–FY2026
+679.9%
+25.64% a year
Each share's claim on the business
−87.2%
shrank without buying or selling a share
Spent on buybacks vs paid in stock
— vs $76.5M
over 10 fiscal years
Diluted shares, split-adjusted
1.6M7.2M12.8M2015: 1.6M shares'152016: 1.6M shares'162017: 1.7M shares'172020: 1.9M shares'202021: 2.1M shares'212022: 3.3M shares'222023: 4.6M shares'232024: 4.8M shares'242025: 5.2M shares'252026: 12.7M shares'26
Buybacks Stock-based comp
$0$6.9M$13.8M2015 buybacks: $02015 stock comp: $11.6M'152016 buybacks: $02016 stock comp: $8.9M'162017 buybacks: $02017 stock comp: $6.7M'172020 buybacks: $02020 stock comp: $6.7M'202021 buybacks: $02021 stock comp: $9.6M'212022 buybacks: $02022 stock comp: $13.8M'222023 buybacks: $02023 stock comp: $10.8M'232024 buybacks: $02024 stock comp: $4.7M'242025 buybacks: $02025 stock comp: $2.8M'252026 buybacks: $02026 stock comp: $849.0K'26

How patient are the owners?

Institutional shares by how long they've been held
5+ years10% 3–5 years0% 1–3 years0% Under 1 year90%
Quarterly turnover
406.1%
of institutional shares changed hands
Top 10 managers, median time held
0 quarters

Super Investors

Investment managers reporting QMCO on Form 13F
AI
Alyeska Investment Group, L.P.
Shares
2.7M
% of company
6.73%
Change vs last qtr
NEW
Held since
Q2 '26
TS
Two Seas Capital LP
Shares
2.5M
% of company
6.31%
Change vs last qtr
NEW
Held since
Q2 '26

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Institutional Funds

Mutual funds and ETFs reporting QMCO on Form N-PORT; together they hold 3.1% of the company
VT
Vanguard Total Stock Market Index Fund
Vanguard Index Funds
Position value
$4.63M
% of company
1.07%
% of the fund
0.00%
As of
June 30, 2026
VE
Vanguard Extended Market Index Fund
Vanguard Index Funds
Position value
$1.88M
% of company
0.43%
% of the fund
0.00%
As of
June 30, 2026

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Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G
JF
John Fichthorn
5%+ holder13D · 40.0%
Shares
16.9M
% of company
42.86%
Change vs last qtr
—
Held since
—
DT
Dialectic Technology SPV LLC
5%+ holder13D · 40.0%
Shares
16.9M
% of company
42.79%
Change vs last qtr
—
Held since
—

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