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Quantum Corp /DE/(QMCO US)

$17.62+0.643.77%Ext:$17.54-0.080.47%(Market Closed · 23:55:48 UTC)

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QMCO US​

SEC Filings

Financials(147)

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  • 10-QQ1ended 30 Jun 202610 Aug
  • 10-KFY 2026ended 31 Mar 202625 Jun
  • NT 10-KFY 2026ended 31 Mar 202615 Jun
  • 10-QQ3ended 31 Dec 202517 Feb
  • 10-QQ2ended 30 Sept 202513 Nov 2025
  • 10-Q/AQ1ended 30 Jun 202523 Sep 2025
  • 10-QQ1ended 30 Jun 202511 Sep 2025
  • 10-KFY 2025ended 31 Mar 202526 Aug 2025
  • NT 10-QQ1ended 30 Jun 202515 Aug 2025
  • NT 10-KFY 2025ended 31 Mar 202530 Jun 2025
  • 10-QQ3ended 31 Dec 202412 Feb 2025
  • 10-QQ2ended 30 Sept 202414 Nov 2024
  • 10-QQ3ended 31 Dec 20236 Sep 2024
  • 10-QQ2ended 30 Sept 20236 Sep 2024
  • 10-QQ1ended 30 Jun 202414 Aug 2024

Events(358)

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  • 8-KDeparture of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers9 Oct
  • 8-KDeparture of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers28 Sep
  • 8-KSubmission of Matters to a Vote of Security Holders17 Sep
  • 8-KDeparture of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers1 Sep
  • 8-KDeparture of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers14 Aug
  • 8-KResults of Operations and Financial Condition10 Aug
  • 8-KResults of Operations and Financial Condition25 Jun
  • 8-KTermination of a Material Definitive Agreement5 Jun
  • 8-KQuantum Announces Preliminary Fiscal Fourth Quarter 2026 Financial Results2 Jun
  • 8-KResults of Operations and Financial Condition17 Feb
  • 8-KDeparture of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers2 Feb
  • 8-KResults of Operations and Financial Condition15 Jan
  • 8-KEntry into a Material Definitive Agreement18 Dec 2025
  • 8-KResults of Operations and Financial Condition13 Nov 2025
  • 8-KResults of Operations and Financial Condition28 Oct 2025

Insider Ownership(889)

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  • 4Statement of changes in beneficial ownership5 Oct
  • 4Statement of changes in beneficial ownership5 Oct
  • 4Statement of changes in beneficial ownership5 Oct
  • 4Statement of changes in beneficial ownership5 Oct
  • 4Statement of changes in beneficial ownership5 Oct
  • 4Statement of changes in beneficial ownership5 Oct
  • 4Statement of changes in beneficial ownership5 Oct
  • 4Statement of changes in beneficial ownership5 Oct
  • 4Statement of changes in beneficial ownership5 Oct
  • 3Initial statement of beneficial ownership8 Sep
  • 4Statement of changes in beneficial ownership5 Aug
  • 4Statement of changes in beneficial ownership7 Jul
  • 4Statement of changes in beneficial ownership7 Jul
  • 4Statement of changes in beneficial ownership8 Jun
  • 4Statement of changes in beneficial ownership8 Jun

Beneficial Ownership(252)

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  • SC 13GQUANTUM CORP /DE/14 Aug
  • SC 13GQUANTUM CORP /DE/14 Aug
  • SC 13GQUANTUM CORP /DE/10 Aug
  • SC 13D/AQUANTUM CORP /DE/8 Jun
  • SC 13D/AQUANTUM CORP /DE/12 Jan
  • SC 13D/AQUANTUM CORP /DE/22 Dec 2025
  • SC 13DQUANTUM CORP /DE/10 Oct 2025
  • SC 13G/AQUANTUM CORP /DE/15 May 2025
  • SC 13G/AQUANTUM CORP /DE/8 May 2025
  • SC 13D/AQUANTUM CORP /DE/17 Apr 2025
  • SC 13D/AQUANTUM CORP /DE/31 Mar 2025
  • SC 13D/AQUANTUM CORP /DE/21 Mar 2025
  • SC 13D/AQUANTUM CORP /DE/21 Feb 2025
  • SC 13G/AQUANTUM CORP /DE/31 Jan 2025
  • SC 13D/AQUANTUM CORP /DE/7 Jan 2025

Other Ownership(11)

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  • 144PACIFIC INVESTMENT MANAGEMENT CO LLC15 Apr 2025
  • 144Cabrera Brian E3 Nov 2023
  • 144Lerner James J11 Oct 2023
  • 144Nash Laura A.6 Oct 2023
  • 144Cabrera Brian E6 Oct 2023
  • 144Hurley John6 Sep 2023
  • 144Lerner James J12 Jul 2023
  • 144Nash Laura A.12 Jul 2023
  • 144Hurley John12 Jul 2023
  • 144Cabrera Brian E12 Jul 2023
  • 144Cabrera Brian E4 May 2023

Proxies(104)

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  • ARSAnnual report to security holders29 Jul
  • DEFA14ADefinitive additional materials29 Jul
  • DEF 14ADefinitive proxy statement29 Jul
  • DEFA14ADefinitive additional materials2 Dec 2025
  • ARSAnnual report to security holders31 Oct 2025
  • DEF 14ADefinitive proxy statement31 Oct 2025
  • DEFA14ADefinitive additional materials31 Oct 2025
  • PRE 14APreliminary proxy statement21 Oct 2025
  • DEFA14ADefinitive additional materials23 Sep 2025
  • DEF 14ADefinitive proxy statement27 Mar 2025
  • PRE 14APreliminary proxy statement17 Mar 2025
  • DEFA14ADefinitive additional materials2 Aug 2024
  • DEFA14ADefinitive additional materials2 Jul 2024
  • DEF 14ADefinitive proxy statement2 Jul 2024
  • ARSAnnual report to security holders2 Jul 2024

Registrations(143)

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  • S-8Registration statement (employee benefit plan)24 Sep
  • 424B3Prospectus filing (Rule 424(b)(3))27 Jul
  • S-1Registration statement (general form)13 Jul
  • 424B3Prospectus filing (Rule 424(b)(3))24 Feb
  • S-8Registration statement (employee benefit plan)18 Feb
  • S-1Registration statement (general form)18 Feb
  • 424B3Prospectus filing (Rule 424(b)(3))24 Nov 2025
  • S-1Registration statement (general form)14 Nov 2025
  • 424B3Prospectus filing (Rule 424(b)(3))1 Oct 2025
  • POS AMPost-effective amendment (unspecified)26 Sep 2025
  • 424B3Prospectus filing (Rule 424(b)(3))29 Apr 2025
  • S-3Registration statement (primary offering)18 Apr 2025
  • 424B3Prospectus filing (Rule 424(b)(3))11 Feb 2025
  • S-1/ARegistration statement (general form, amendment)6 Feb 2025
  • S-1Registration statement (general form)27 Jan 2025

Filing Review Correspondence(20)

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  • CORRESPFiling review correspondence19 Feb
  • CORRESPFiling review correspondence19 Nov 2025
  • CORRESPFiling review correspondence24 Apr 2025
  • CORRESPFiling review correspondence7 Feb 2025
  • CORRESPFiling review correspondence18 Nov 2024
  • CORRESPFiling review correspondence3 Oct 2024
  • CORRESPFiling review correspondence26 Sep 2024
  • CORRESPFiling review correspondence11 Jan 2023
  • CORRESPFiling review correspondence27 Dec 2021
  • CORRESPFiling review correspondence20 Aug 2021
  • CORRESPFiling review correspondence9 Feb 2021
  • CORRESPFiling review correspondence7 Dec 2020
  • CORRESPFiling review correspondence16 Feb 2017
  • CORRESPFiling review correspondence14 Feb 2017
  • CORRESPFiling review correspondence15 Jul 2014

SEC Orders And Notices(12)

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  • EFFECTNotice of effectiveness27 Jul
  • EFFECTNotice of effectiveness24 Feb
  • EFFECTNotice of effectiveness24 Nov 2025
  • EFFECTNotice of effectiveness30 Sep 2025
  • EFFECTNotice of effectiveness28 Apr 2025
  • EFFECTNotice of effectiveness11 Feb 2025
  • EFFECTNotice of effectiveness13 Jan 2023
  • EFFECTNotice of effectiveness29 Dec 2021
  • EFFECTNotice of effectiveness24 Aug 2021
  • EFFECTNotice of effectiveness11 Feb 2021
  • EFFECTNotice of effectiveness9 Dec 2020
  • EFFECTNotice of effectiveness21 Jul 2006

Tender Offers And Going Private(11)

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  • SC TO-I/AAMENDMENT NO. 6 TO ISSUER TENDER OFFER4 Jun 2009
  • SC TO-I/AAMENDMENT NO. 5 TO ISSUER TENDER OFFER1 Jun 2009
  • SC TO-I/AAMENDMENT NO. 4 TO ISSUER TENDER OFFER28 May 2009
  • SC TO-I/AAMENDMENT NO. 3 TO ISSUER TENDER OFFER13 May 2009
  • SC TO-I/AAMENDMENT NO. 2 TO ISSUER TENDER OFFER28 Apr 2009
  • SC TO-I/AAMENDMENT NO. 1 TO ISSUER TENDER OFFER17 Apr 2009
  • SC TO-ISCHEDULE TO27 Mar 2009
  • SC TO-I/ATender offer statement (issuer, amendment)6 Aug 2001
  • SC TO-I/AAMENDMENT NO. 2 TO THE SCHEDULE TO12 Jul 2001
  • SC TO-I/AAMENDMENT NO. 1 TO SC TO-I22 Jun 2001
  • SC TO-IISSUER TENDER OFFER4 Jun 2001

Exempt Offerings(1)

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  • DNotice of exempt offering of securities (Reg D)29 Jun 2011

Other(19)

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  • SDSD29 May
  • SDSD28 May 2025
  • SDSD30 May 2024
  • SDSD31 May 2023
  • SDSD31 May 2022
  • SD/ASD/A1 Jun 2021
  • SDSD28 May 2021
  • SDSD28 May 2020
  • CERTCERT30 Jan 2020
  • SD/ASD/A7 Jun 2019
  • SDSD3 Jun 2019
  • SDSD24 May 2018
  • SDSPECIALIZED DISCLOSURE REPORT4 May 2017
  • SDSPECIALIZED DISCLOSURE REPORT19 May 2016
  • SDSPECIALIZED DISCLOSURE REPORT14 May 2015