MASON CAPITAL MANAGEMENT LLC SEC EDGAR Filings (CIK 0001218735)

SEC EDGAR filings, ownership reports, and insider transactions for MASON CAPITAL MANAGEMENT LLC.

Business address
110 East 59 Th Street, 30 Th Floor, New York, NY, 10022
Top holdings (ownership)
LEGO
Top securities (13F)
ATS, KVUE, BKD, CCO, MLAB, and SBNY
State of incorporation
DE
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MASON CAPITAL MANAGEMENT LLC has filed 218 SEC EDGAR filings since 14 Feb 2003

Latest Filings

Recent SEC filings for MASON CAPITAL MANAGEMENT LLC including 13F-HR, N-PX, DFAN14A and more.

Form type Document Filing Description Filing date Reporting date File number(s)
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2025 30 Sep 2025 028-10413
N-PX Open N-PX document View SEC filing for N-PX 26 Aug 2025 30 Jun 2025 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2025 30 Jun 2025 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2025 31 Mar 2025 028-10413
DFAN14A Open DFAN14A document View SEC filing for DFAN14A DFAN14A 15 May 2025
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2025 31 Dec 2024 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2024 30 Sep 2024 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A ATS CORPORATION 13 Nov 2024
N-PX Open N-PX document View SEC filing for N-PX 28 Aug 2024 30 Jun 2024 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2024 30 Jun 2024 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2024 31 Mar 2024 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Feb 2024 31 Dec 2023 028-10413
SC 13G Open SC 13G document View SEC filing for SC 13G ATS CORPORATION 14 Feb 2024
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2023 30 Sep 2023 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2023 30 Jun 2023 028-10413
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A PSQ HOLDINGS, INC. 21 Jul 2023
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A COLOMBIER ACQUISITION CORP. 19 Jul 2023
SC 13D Open SC 13D document View SEC filing for SC 13D COLOMBIER ACQUISITION CORP. 26 Jun 2023
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2023 31 Mar 2023 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2023 31 Dec 2022 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2022 30 Sep 2022 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Aug 2022 30 Jun 2022 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 May 2022 31 Mar 2022 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2022 31 Dec 2021 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 14 Feb 2022
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A CORECIVIC, INC. 05 Jan 2022
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Nov 2021 30 Sep 2021 028-10413
SC 13D Open SC 13D document View SEC filing for SC 13D CORECIVIC, INC. 12 Nov 2021
4 Open 4 document View SEC filing for 4 16 Aug 2021 12 Aug 2021 001-39906
3 Open 3 document View SEC filing for 3 16 Aug 2021 12 Aug 2021 001-39906
SC 13G Open SC 13G document View SEC filing for SC 13G LEGATO MERGER CORP. 16 Aug 2021
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Aug 2021 30 Jun 2021 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 17 May 2021 31 Mar 2021 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Feb 2021 31 Dec 2020 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A CLEAR CHANNEL OUTDOOR HOLDINGS, INC. 09 Feb 2021
4/A Open 4/A document View SEC filing for 4/A FORM 4/A 08 Feb 2021 29 Jan 2021 001-39955
3/A Open 3/A document View SEC filing for 3/A FORM 3/A 08 Feb 2021 28 Jan 2021 001-39955
4 Open 4 document View SEC filing for 4 FORM 4 02 Feb 2021 29 Jan 2021 001-39955
3/A Open 3/A document View SEC filing for 3/A FORM 3/A 01 Feb 2021 28 Jan 2021 001-39955
13F-HR/A Open 13F-HR/A document View SEC filing for 13F-HR/A 01 Dec 2020 30 Sep 2020 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13 Nov 2020 30 Sep 2020 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2020 30 Jun 2020 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2020 31 Mar 2020 028-10413
SC 13G Open SC 13G document View SEC filing for SC 13G CLEAR CHANNEL OUTDOOR HOLDINGS, INC. 12 Mar 2020
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2020 31 Dec 2019 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2019 30 Sep 2019 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2019 30 Jun 2019 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2019 31 Mar 2019 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2019 31 Dec 2018 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Nov 2018 30 Sep 2018 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2018 30 Jun 2018 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2018 31 Mar 2018 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2018 31 Dec 2017 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2017 30 Sep 2017 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2017 30 Jun 2017 028-10413
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 23 Jun 2017
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2017 31 Mar 2017 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2017 31 Dec 2016 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2016 30 Sep 2016 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Aug 2016 30 Jun 2016 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 May 2016 31 Mar 2016 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Feb 2016 31 Dec 2015 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Nov 2015 30 Sep 2015 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2015 30 Jun 2015 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2015 31 Mar 2015 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 17 Feb 2015 31 Dec 2014 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SCHEDULE 13G/A 17 Feb 2015
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SCHEDULE 13G/A 17 Feb 2015
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SCHEDULE 13G/A 17 Feb 2015
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SCHEDULE 13G/A 17 Feb 2015
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2014 30 Sep 2014 028-10413
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 02 Oct 2014
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2014 30 Jun 2014 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 May 2014 31 Mar 2014 028-10413
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 21 Mar 2014 21 Mar 2014 001-34658
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 28 Feb 2014
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2014 31 Dec 2013 028-10413
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 14 Feb 2014 27 Feb 2013 001-34658
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SC 13G/A 14 Feb 2014
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SC 13G/A 14 Feb 2014
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SC 13G/A 14 Feb 2014
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A SC 13D/A 16 Jan 2014
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2013 30 Sep 2013 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Aug 2013 30 Jun 2013 028-10413
SC 13G Open SC 13G document View SEC filing for SC 13G SC 13G 05 Jul 2013
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13F-HR 15 May 2013 31 Mar 2013 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13F-HR 14 Feb 2013 31 Dec 2012 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SC 13G/A 14 Feb 2013
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SC 13G/A 14 Feb 2013
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 22 Jan 2013 17 Jan 2013 001-32663
4/A Open 4/A document View SEC filing for 4/A OWNERSHIP DOCUMENT 14 Jan 2013 09 Jan 2013 001-34658
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 11 Jan 2013 09 Jan 2013 001-34658
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13F-HR 14 Nov 2012 30 Sep 2012 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13F-HR 14 Aug 2012 30 Jun 2012 028-10413
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 20 Jul 2012 18 Jul 2012 001-34658
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 06 Jun 2012 04 Jun 2012 001-34658
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13F-HR 15 May 2012 31 Mar 2012 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A AMENDMENT TO SCHEDULE 13G 14 Feb 2012
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A AMENDMENT TO SCHEDULE 13G 14 Feb 2012
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A AMENDMENT TO SCHEDULE 13G 14 Feb 2012
13F-HR Open 13F-HR document View SEC filing for 13F-HR HOLDINGS REPORT 14 Feb 2012 31 Dec 2011 028-10413
13F-HR/A Open 13F-HR/A document View SEC filing for 13F-HR/A 19 Jan 2012 30 Sep 2010 028-10413
4 Open 4 document View SEC filing for 4 OWNERSHIP DOCUMENT 19 Dec 2011 15 Dec 2011 001-34658
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Nov 2011 30 Sep 2011 028-10413
SC 13G Open SC 13G document View SEC filing for SC 13G 14 Oct 2011
3 Open 3 document View SEC filing for 3 OWNERSHIP DOCUMENT 26 Sep 2011 23 Sep 2011 001-34658
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 26 Sep 2011
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Aug 2011 30 Jun 2011 028-10413
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 May 2011 31 Mar 2011 028-10413
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A 04 Apr 2011
SC 13D Open SC 13D document View SEC filing for SC 13D 01 Apr 2011
SC 13G Open SC 13G document View SEC filing for SC 13G 18 Mar 2011
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A 07 Mar 2011
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A 25 Feb 2011
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 14 Feb 2011
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 14 Feb 2011
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Feb 2011 31 Dec 2010 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 14 Feb 2011
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 14 Feb 2011
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A 11 Feb 2011
SC 13D/A Open SC 13D/A document View SEC filing for SC 13D/A 25 Jan 2011
SC 13D Open SC 13D document View SEC filing for SC 13D 18 Jan 2011
SC 13G Open SC 13G document View SEC filing for SC 13G 14 Dec 2010
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Nov 2010 30 Sep 2010 028-10413
SC 13D Open SC 13D document View SEC filing for SC 13D 18 Oct 2010
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Aug 2010 30 Jun 2010 028-10413
SC 13G Open SC 13G document View SEC filing for SC 13G 10 Aug 2010
13F-HR Open 13F-HR document View SEC filing for 13F-HR 17 May 2010 31 Mar 2010 028-10413
SC 13G Open SC 13G document View SEC filing for SC 13G 22 Mar 2010
SC 13G Open SC 13G document View SEC filing for SC 13G 15 Mar 2010
13FCONP Open 13FCONP document View SEC filing for 13FCONP AUTO-GENERATED PAPER DOCUMENT 16 Feb 2010 30 Sep 2009 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 16 Feb 2010
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Feb 2010 31 Dec 2009 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 16 Feb 2010
13F-HR/A Open 13F-HR/A document View SEC filing for 13F-HR/A 16 Feb 2010 30 Sep 2009 028-10413
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 16 Feb 2010
4 Open 4 document View SEC filing for 4 04 Feb 2010 02 Feb 2010 001-32663
3 Open 3 document View SEC filing for 3 19 Jan 2010 08 Jan 2010 001-32663
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 19 Jan 2010
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 11 Jan 2010

About this filer

MASON CAPITAL MANAGEMENT LLC files with the SEC under CIK 0001218735. This page aggregates EDGAR filings and related ownership activity.

See reporting owner transactions.

FAQ

What is a CIK?
A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?
New filings appear as the SEC updates EDGAR, and older records can vary by availability.
How often is this page updated?
Updates follow new EDGAR submissions and periodic data refreshes.

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