| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 13F-HR | Open Document | Open Filing | 14 Nov 2025 | 30 Sep 2025 | 028-11711 | |
| N-PX | Open Document | Open Filing | 02 Sep 2025 | 30 Jun 2025 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Aug 2025 | 30 Jun 2025 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 15 May 2025 | 31 Mar 2025 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Feb 2025 | 31 Dec 2024 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Nov 2024 | 30 Sep 2024 | 028-11711 | |
| N-PX | Open Document | Open Filing | 03 Sep 2024 | 30 Jun 2024 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Aug 2024 | 30 Jun 2024 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 15 May 2024 | 31 Mar 2024 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Feb 2024 | 31 Dec 2023 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Nov 2023 | 30 Sep 2023 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Aug 2023 | 30 Jun 2023 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 15 May 2023 | 31 Mar 2023 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Feb 2023 | 31 Dec 2022 | 028-11711 | |
| SC 13G/A | Open Document | Open Filing | SC 13G/A | 14 Feb 2023 | ||
| SC 13G/A | Open Document | Open Filing | SC 13G/A | 14 Feb 2023 | ||
| SC 13G/A | Open Document | Open Filing | SC 13G/A | 14 Feb 2023 | ||
| 13F-HR | Open Document | Open Filing | 14 Nov 2022 | 30 Sep 2022 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 15 Aug 2022 | 30 Jun 2022 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 16 May 2022 | 31 Mar 2022 | 028-11711 | |
| SC 13G | Open Document | Open Filing | 14 Feb 2022 | |||
| SC 13G | Open Document | Open Filing | 14 Feb 2022 | |||
| SC 13G | Open Document | Open Filing | 14 Feb 2022 | |||
| 13F-HR | Open Document | Open Filing | 14 Feb 2022 | 31 Dec 2021 | 028-11711 | |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 27 Dec 2021 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 23 Nov 2021 | ||
| 13F-HR | Open Document | Open Filing | 15 Nov 2021 | 30 Sep 2021 | 028-11711 | |
| 4 | Open Document | Open Filing | FORM 4 | 06 Oct 2021 | 04 Oct 2021 | 001-12719 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 06 Oct 2021 | ||
| 4 | Open Document | Open Filing | FORM 4 | 24 Sep 2021 | 22 Sep 2021 | 001-12719 |
| SC 13D/A | Open Document | Open Filing | 24 Sep 2021 | |||
| 4 | Open Document | Open Filing | FORM 4 | 10 Sep 2021 | 08 Sep 2021 | 001-12719 |
| 13F-HR | Open Document | Open Filing | 16 Aug 2021 | 30 Jun 2021 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 May 2021 | 31 Mar 2021 | 028-11711 | |
| 4 | Open Document | Open Filing | FORM 4 | 11 Mar 2021 | 09 Mar 2021 | 001-12719 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 11 Mar 2021 | ||
| 13F-HR | Open Document | Open Filing | 16 Feb 2021 | 31 Dec 2020 | 028-11711 | |
| 4 | Open Document | Open Filing | 10 Dec 2020 | 08 Dec 2020 | 001-36166 | |
| SC 13D/A | Open Document | Open Filing | HOUGHTON MIFFLIN HARCOURT COMPANY | 10 Dec 2020 | ||
| 13F-HR | Open Document | Open Filing | 16 Nov 2020 | 30 Sep 2020 | 028-11711 | |
| SC 13D/A | Open Document | Open Filing | HOUGHTON MIFFLIN HARCOURT CO | 05 Nov 2020 | ||
| 13F-HR | Open Document | Open Filing | 14 Aug 2020 | 30 Jun 2020 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 15 May 2020 | 31 Mar 2020 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Feb 2020 | 31 Dec 2019 | 028-11711 | |
| SC 13G/A | Open Document | Open Filing | 13 Feb 2020 | |||
| SC 13G/A | Open Document | Open Filing | 13 Feb 2020 | |||
| SC 13G/A | Open Document | Open Filing | 13 Feb 2020 | |||
| 13F-HR | Open Document | Open Filing | 14 Nov 2019 | 30 Sep 2019 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Aug 2019 | 30 Jun 2019 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 15 May 2019 | 31 Mar 2019 | 028-11711 | |
| 4 | Open Document | Open Filing | 13 May 2019 | 09 May 2019 | 001-38088 | |
| 4 | Open Document | Open Filing | 08 Mar 2019 | 07 Mar 2019 | 001-36166 | |
| SC 13D/A | Open Document | Open Filing | 08 Mar 2019 | |||
| SC 13G | Open Document | Open Filing | 14 Feb 2019 | |||
| SC 13G | Open Document | Open Filing | 14 Feb 2019 | |||
| SC 13G/A | Open Document | Open Filing | 14 Feb 2019 | |||
| 13F-HR | Open Document | Open Filing | 14 Feb 2019 | 31 Dec 2018 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Nov 2018 | 30 Sep 2018 | 028-11711 | |
| SC 13D/A | Open Document | Open Filing | 03 Oct 2018 | |||
| 13F-HR | Open Document | Open Filing | 14 Aug 2018 | 30 Jun 2018 | 028-11711 | |
| SC 13D | Open Document | Open Filing | 24 May 2018 | |||
| 13F-HR | Open Document | Open Filing | 15 May 2018 | 31 Mar 2018 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Feb 2018 | 31 Dec 2017 | 028-11711 | |
| SC 13G/A | Open Document | Open Filing | 14 Feb 2018 | |||
| SC 13G/A | Open Document | Open Filing | 14 Feb 2018 | |||
| SC 13G/A | Open Document | Open Filing | 14 Feb 2018 | |||
| SC 13G | Open Document | Open Filing | 14 Feb 2018 | |||
| SC 13G/A | Open Document | Open Filing | SC 13G/A | 26 Jan 2018 | ||
| SC 13G | Open Document | Open Filing | SC 13G | 24 Jan 2018 | ||
| 4 | Open Document | Open Filing | 20 Dec 2017 | 18 Dec 2017 | 001-34956 | |
| SC 13G/A | Open Document | Open Filing | 20 Dec 2017 | |||
| 13F-HR | Open Document | Open Filing | 14 Nov 2017 | 30 Sep 2017 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Aug 2017 | 30 Jun 2017 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 15 May 2017 | 31 Mar 2017 | 028-11711 | |
| 3 | Open Document | Open Filing | 09 May 2017 | 09 May 2017 | 001-38088 | |
| 3 | Open Document | Open Filing | 08 May 2017 | 27 Apr 2017 | 001-37712 | |
| SC 13D | Open Document | Open Filing | 08 May 2017 | |||
| 13F-HR | Open Document | Open Filing | 14 Feb 2017 | 31 Dec 2016 | 028-11711 | |
| SC 13G/A | Open Document | Open Filing | 14 Feb 2017 | |||
| SC 13G | Open Document | Open Filing | 14 Feb 2017 | |||
| SC 13G/A | Open Document | Open Filing | 14 Feb 2017 | |||
| SC 13G/A | Open Document | Open Filing | 08 Feb 2017 | |||
| SC 13G/A | Open Document | Open Filing | 07 Feb 2017 | |||
| SC 13G/A | Open Document | Open Filing | 07 Feb 2017 | |||
| SC 13G | Open Document | Open Filing | 03 Jan 2017 | |||
| 3 | Open Document | Open Filing | 03 Jan 2017 | 22 Dec 2016 | 001-12719 | |
| SC 13D/A | Open Document | Open Filing | ANCHORAGE CAPITAL GROUP, LLC SC 13DA 12-21-2016 (HOUGHTON MIFFLIN HARCOURT COMPA | 22 Dec 2016 | ||
| 13F-HR | Open Document | Open Filing | 14 Nov 2016 | 30 Sep 2016 | 028-11711 | |
| SC 13G | Open Document | Open Filing | 11 Oct 2016 | |||
| 13F-HR | Open Document | Open Filing | 15 Aug 2016 | 30 Jun 2016 | 028-11711 | |
| SC 13G/A | Open Document | Open Filing | 09 Jun 2016 | |||
| 13F-HR | Open Document | Open Filing | 16 May 2016 | 31 Mar 2016 | 028-11711 | |
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 4 TO SCHEDULE 13D | 01 Mar 2016 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 26 Feb 2016 | ||
| SC 13G | Open Document | Open Filing | 16 Feb 2016 | |||
| SC 13G/A | Open Document | Open Filing | 16 Feb 2016 | |||
| SC 13G/A | Open Document | Open Filing | 16 Feb 2016 | |||
| SC 13G/A | Open Document | Open Filing | 16 Feb 2016 | |||
| SC 13G/A | Open Document | Open Filing | 16 Feb 2016 | |||
| SC 13G/A | Open Document | Open Filing | 16 Feb 2016 | |||
| 13F-HR | Open Document | Open Filing | 16 Feb 2016 | 31 Dec 2015 | 028-11711 | |
| 4 | Open Document | Open Filing | FORM 4 | 10 Feb 2016 | 08 Feb 2016 | 001-34956 |
| 4 | Open Document | Open Filing | FORM 4 | 05 Feb 2016 | 03 Feb 2016 | 001-34956 |
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 3 TO SCHEDULE 13D | 22 Jan 2016 | ||
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 2 TO SCHEDULE 13D | 14 Dec 2015 | ||
| SC 13D | Open Document | Open Filing | 24 Nov 2015 | |||
| 13F-HR | Open Document | Open Filing | 16 Nov 2015 | 30 Sep 2015 | 028-11711 | |
| 3 | Open Document | Open Filing | FORM 3 | 25 Sep 2015 | 15 Sep 2015 | 001-34956 |
| SC 13G/A | Open Document | Open Filing | 17 Sep 2015 | |||
| 13F-HR | Open Document | Open Filing | 14 Aug 2015 | 30 Jun 2015 | 028-11711 | |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 10 Aug 2015 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 05 Aug 2015 | ||
| 4 | Open Document | Open Filing | FORM 4 | 30 Jun 2015 | 26 Jun 2015 | 001-36166 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 11 Jun 2015 | ||
| 4 | Open Document | Open Filing | 4 | 08 Jun 2015 | 04 Jun 2015 | 001-31567 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 08 Jun 2015 | ||
| 13F-HR | Open Document | Open Filing | 15 May 2015 | 31 Mar 2015 | 028-11711 | |
| SC 13G/A | Open Document | Open Filing | 07 Apr 2015 | |||
| SC 13D/A | Open Document | Open Filing | AMENDMENT NO. 1 TO SCHEDULE 13D | 02 Apr 2015 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 02 Apr 2015 | ||
| 4 | Open Document | Open Filing | 4 | 30 Mar 2015 | 26 Mar 2015 | 001-31567 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 27 Mar 2015 | ||
| SC 13G | Open Document | Open Filing | 13 Mar 2015 | |||
| 4 | Open Document | Open Filing | FORM 4 | 10 Mar 2015 | 06 Mar 2015 | 001-34956 |
| 3 | Open Document | Open Filing | FORM 3 | 10 Mar 2015 | 05 Mar 2015 | 001-34956 |
| SC 13G | Open Document | Open Filing | 17 Feb 2015 | |||
| SC 13G/A | Open Document | Open Filing | 17 Feb 2015 | |||
| SC 13G/A | Open Document | Open Filing | 17 Feb 2015 | |||
| SC 13G/A | Open Document | Open Filing | 17 Feb 2015 | |||
| SC 13G/A | Open Document | Open Filing | 17 Feb 2015 | |||
| SC 13G/A | Open Document | Open Filing | 17 Feb 2015 | |||
| SC 13G/A | Open Document | Open Filing | 17 Feb 2015 | |||
| 13F-HR | Open Document | Open Filing | 17 Feb 2015 | 31 Dec 2014 | 028-11711 | |
| SC 13D/A | Open Document | Open Filing | 09 Jan 2015 | |||
| 13F-HR | Open Document | Open Filing | 14 Nov 2014 | 30 Sep 2014 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 14 Aug 2014 | 30 Jun 2014 | 028-11711 | |
| 13F-HR | Open Document | Open Filing | 15 May 2014 | 31 Mar 2014 | 028-11711 | |
| 4 | Open Document | Open Filing | 4 | 09 Apr 2014 | 07 Apr 2014 | 001-31567 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 09 Apr 2014 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 21 Mar 2014 | ||
| SC 13D/A | Open Document | Open Filing | SC 13D/A | 24 Feb 2014 | ||
| SC 13G | Open Document | Open Filing | 14 Feb 2014 | |||
| SC 13G | Open Document | Open Filing | 14 Feb 2014 | |||
| SC 13G/A | Open Document | Open Filing | 14 Feb 2014 | |||
| SC 13G/A | Open Document | Open Filing | 14 Feb 2014 | |||
| 13F-HR | Open Document | Open Filing | 14 Feb 2014 | 31 Dec 2013 | 028-11711 | |
| SC 13D/A | Open Document | Open Filing | 24 Jan 2014 |