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ISSUER PROFILE · CIK 0000709283 · CUSIP 747906600

QUANTUM CORP /DE/QMCO

11 13D/G filings 5 distinct filers 4 insider transactions (365d)

Post-Filing Returns · across 3 activist filings on this issuer

Median 30d
avg —
Median 60d
avg —
Median 90d
avg —
Median 180d
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Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
11
1 SCHEDULE 13D/A · 3 SCHEDULE · 7 SC
Distinct filers
5
multi-activist cluster
Insiders (365d)
4
1 buys · 0 sales
Latest short DTC
1.96
as of 2026-05-29

13D/G Filings Timeline · 11 total

FiledFormFilerStakeSharesIntent
2026-06-08 SCHEDULE 13D/A Dialectic Technology SPV LLC 40.00% 16,863,839 view →
2026-01-12 SCHEDULE Dialectic Technology SPV LLC 41.40% 9,691,228 view →
2025-02-21 SCHEDULE Blue Torch Capital LP 2.30% 135,763 view →
2025-01-07 SCHEDULE PACIFIC INVESTMENT MANAGEMENT CO LLC 16.70% 962,127 view →
2023-07-14 SC PACIFIC INVESTMENT MANAGEMENT CO LLC view →
2022-08-12 SC PACIFIC INVESTMENT MANAGEMENT CO LLC view →
2022-06-10 SC B. Riley Financial, Inc. view →
2021-04-28 SC B. Riley Financial, Inc. view →
2021-02-08 SC B. Riley Financial, Inc. view →
2020-04-29 SC B. Riley Financial, Inc. view →
2020-03-11 SC VIEX Capital Advisors, LLC view →

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-06-04 FICHTHORN JOHN director, 10%+ C 11,020,645 $5.19 $57.24M
2026-06-04 FICHTHORN JOHN director, 10%+ Award 3,083,975 $5.19 $16.02M
2026-06-04 FICHTHORN JOHN director, 10%+ C 57,241,228 $5.19 $297.31M
2026-06-01 FICHTHORN JOHN director, 10%+ J 105,911 $5.19 $550K

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-05-29 1,392,155 1.96 -9.3%
2026-05-15 1,535,366 2.14 -13.7%
2026-04-30 1,778,340 5.22 -10.0%
2026-04-15 1,976,798 3.77 +10.1%
2026-03-31 1,796,279 5.12 -11.2%
2026-03-13 2,022,035 4.31 -12.7%
2026-02-27 2,316,565 3.68 +10.3%
2026-02-13 2,100,850 4.01 +23.4%
2026-01-30 1,702,614 3.03 +4.5%
2026-01-15 1,629,950 2.87 +3.5%
2025-12-31 1,574,033 2.97 -7.7%
2025-12-15 1,705,424 3.58 +11.8%

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