Mason Capital Management Llc

Business address
110 East 59 Th Street, 30 Th Floor, 10022 New York, NY
State of incorporation
DE
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Mason Capital Management Llc has filed 218 SEC EDGAR filings since 2/14/2003

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
13F-HR Open Document Open Filing Nov 14, 2025 Sep 30, 2025 028-10413
N-PX Open Document Open Filing Aug 26, 2025 Jun 30, 2025 028-10413
13F-HR Open Document Open Filing Aug 14, 2025 Jun 30, 2025 028-10413
13F-HR Open Document Open Filing May 15, 2025 Mar 31, 2025 028-10413
DFAN14A Open Document Open Filing DFAN14A May 15, 2025
13F-HR Open Document Open Filing Feb 14, 2025 Dec 31, 2024 028-10413
13F-HR Open Document Open Filing Nov 14, 2024 Sep 30, 2024 028-10413
SC 13G/A Open Document Open Filing ATS CORPORATION Nov 13, 2024
N-PX Open Document Open Filing Aug 28, 2024 Jun 30, 2024 028-10413
13F-HR Open Document Open Filing Aug 14, 2024 Jun 30, 2024 028-10413
13F-HR Open Document Open Filing May 15, 2024 Mar 31, 2024 028-10413
13F-HR Open Document Open Filing Feb 15, 2024 Dec 31, 2023 028-10413
SC 13G Open Document Open Filing ATS CORPORATION Feb 14, 2024
13F-HR Open Document Open Filing Nov 14, 2023 Sep 30, 2023 028-10413
13F-HR Open Document Open Filing Aug 14, 2023 Jun 30, 2023 028-10413
SC 13D/A Open Document Open Filing PSQ HOLDINGS, INC. Jul 21, 2023
SC 13D/A Open Document Open Filing COLOMBIER ACQUISITION CORP. Jul 19, 2023
SC 13D Open Document Open Filing COLOMBIER ACQUISITION CORP. Jun 26, 2023
13F-HR Open Document Open Filing May 15, 2023 Mar 31, 2023 028-10413
13F-HR Open Document Open Filing Feb 14, 2023 Dec 31, 2022 028-10413
13F-HR Open Document Open Filing Nov 14, 2022 Sep 30, 2022 028-10413
13F-HR Open Document Open Filing Aug 15, 2022 Jun 30, 2022 028-10413
13F-HR Open Document Open Filing May 16, 2022 Mar 31, 2022 028-10413
13F-HR Open Document Open Filing Feb 14, 2022 Dec 31, 2021 028-10413
SC 13G/A Open Document Open Filing Feb 14, 2022
SC 13D/A Open Document Open Filing CORECIVIC, INC. Jan 5, 2022
13F-HR Open Document Open Filing Nov 15, 2021 Sep 30, 2021 028-10413
SC 13D Open Document Open Filing CORECIVIC, INC. Nov 12, 2021
4 Open Document Open Filing Aug 16, 2021 Aug 12, 2021 001-39906
3 Open Document Open Filing Aug 16, 2021 Aug 12, 2021 001-39906
SC 13G Open Document Open Filing LEGATO MERGER CORP. Aug 16, 2021
13F-HR Open Document Open Filing Aug 16, 2021 Jun 30, 2021 028-10413
13F-HR Open Document Open Filing May 17, 2021 Mar 31, 2021 028-10413
13F-HR Open Document Open Filing Feb 16, 2021 Dec 31, 2020 028-10413
SC 13G/A Open Document Open Filing CLEAR CHANNEL OUTDOOR HOLDINGS, INC. Feb 9, 2021
4/A Open Document Open Filing FORM 4/A Feb 8, 2021 Jan 29, 2021 001-39955
3/A Open Document Open Filing FORM 3/A Feb 8, 2021 Jan 28, 2021 001-39955
4 Open Document Open Filing FORM 4 Feb 2, 2021 Jan 29, 2021 001-39955
3/A Open Document Open Filing FORM 3/A Feb 1, 2021 Jan 28, 2021 001-39955
13F-HR/A Open Document Open Filing Dec 1, 2020 Sep 30, 2020 028-10413
13F-HR Open Document Open Filing Nov 13, 2020 Sep 30, 2020 028-10413
13F-HR Open Document Open Filing Aug 14, 2020 Jun 30, 2020 028-10413
13F-HR Open Document Open Filing May 15, 2020 Mar 31, 2020 028-10413
SC 13G Open Document Open Filing CLEAR CHANNEL OUTDOOR HOLDINGS, INC. Mar 12, 2020
13F-HR Open Document Open Filing Feb 14, 2020 Dec 31, 2019 028-10413
13F-HR Open Document Open Filing Nov 14, 2019 Sep 30, 2019 028-10413
13F-HR Open Document Open Filing Aug 14, 2019 Jun 30, 2019 028-10413
13F-HR Open Document Open Filing May 15, 2019 Mar 31, 2019 028-10413
13F-HR Open Document Open Filing Feb 14, 2019 Dec 31, 2018 028-10413
13F-HR Open Document Open Filing Nov 15, 2018 Sep 30, 2018 028-10413
13F-HR Open Document Open Filing Aug 14, 2018 Jun 30, 2018 028-10413
13F-HR Open Document Open Filing May 15, 2018 Mar 31, 2018 028-10413
13F-HR Open Document Open Filing Feb 14, 2018 Dec 31, 2017 028-10413
13F-HR Open Document Open Filing Nov 14, 2017 Sep 30, 2017 028-10413
13F-HR Open Document Open Filing Aug 14, 2017 Jun 30, 2017 028-10413
SC 13G Open Document Open Filing SC 13G Jun 23, 2017
13F-HR Open Document Open Filing May 15, 2017 Mar 31, 2017 028-10413
13F-HR Open Document Open Filing Feb 14, 2017 Dec 31, 2016 028-10413
13F-HR Open Document Open Filing Nov 14, 2016 Sep 30, 2016 028-10413
13F-HR Open Document Open Filing Aug 15, 2016 Jun 30, 2016 028-10413
13F-HR Open Document Open Filing May 16, 2016 Mar 31, 2016 028-10413
13F-HR Open Document Open Filing Feb 16, 2016 Dec 31, 2015 028-10413
13F-HR Open Document Open Filing Nov 16, 2015 Sep 30, 2015 028-10413
13F-HR Open Document Open Filing Aug 14, 2015 Jun 30, 2015 028-10413
13F-HR Open Document Open Filing May 15, 2015 Mar 31, 2015 028-10413
13F-HR Open Document Open Filing Feb 17, 2015 Dec 31, 2014 028-10413
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 17, 2015
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 17, 2015
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 17, 2015
SC 13G/A Open Document Open Filing SCHEDULE 13G/A Feb 17, 2015
13F-HR Open Document Open Filing Nov 14, 2014 Sep 30, 2014 028-10413
SC 13G Open Document Open Filing SC 13G Oct 2, 2014
13F-HR Open Document Open Filing Aug 14, 2014 Jun 30, 2014 028-10413
13F-HR Open Document Open Filing May 15, 2014 Mar 31, 2014 028-10413
4 Open Document Open Filing OWNERSHIP DOCUMENT Mar 21, 2014 Mar 21, 2014 001-34658
SC 13G Open Document Open Filing SC 13G Feb 28, 2014
13F-HR Open Document Open Filing Feb 14, 2014 Dec 31, 2013 028-10413
3 Open Document Open Filing OWNERSHIP DOCUMENT Feb 14, 2014 Feb 27, 2013 001-34658
SC 13G/A Open Document Open Filing SC 13G/A Feb 14, 2014
SC 13G/A Open Document Open Filing SC 13G/A Feb 14, 2014
SC 13G/A Open Document Open Filing SC 13G/A Feb 14, 2014
SC 13D/A Open Document Open Filing SC 13D/A Jan 16, 2014