SCHEDULE Filed 2025-02-21 Event 2025-02-13 SEC 0000902664-25-001166 →

QMCO

Stake: 2.30% Shares: 135,763 CUSIP: 747906600 Class: Common stock, $0.01 par value per share

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

4 transactions

1 buys · 0 sales · 0 awards/exercises

Issuer Cluster

11 13D/G filings on this issuer

10 other filings besides this one

Filer Track Record

1 filings by this filer

0 other filings in the data moat

Short Interest · settle 2026-07-15

DTC 2.86

2,288,430 shares short · +6.6% vs prior

Post-Filing Returns · since 2025-02-13 on QMCO

+1 day

0.0%

+5 days

0.0%

+30 days

0.0%

+60 days

0.0%

+90 days

0.0%

+180 days

0.0%

Anchor price 10.13 on closest trading day on/after 2025-02-13. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-06-04	FICHTHORN JOHN	director, 10%+ owner	C	11,020,645	$5.19	$57.24M
2026-06-04	FICHTHORN JOHN	director, 10%+ owner	Award	3,083,975	$5.19	$16.02M
2026-06-04	FICHTHORN JOHN	director, 10%+ owner	C	57,241,228	$5.19	$297.31M
2026-06-01	FICHTHORN JOHN	director, 10%+ owner	J	105,911	$5.19	$550K

Other 13D/G Filings on QUANTUM CORP /DE/

Filed	Form	Filer	Stake	Shares
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 →
2025-01-07	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 →

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