| Date Filed | Type | Description |
| 02/10/2023 |
SC 13G
| Form SC 13G - Statement of acquisition of beneficial ownership by individuals: |
| 04/21/2022 |
15-12B
| Form 15-12B - Securities registration termination [Section 12(b)]: |
| 04/18/2022 |
SC 13G
| GLAZER CAPITAL, LLC reports a 0% stake in Houghton Mifflin Harcourt Co. |
| 04/15/2022 |
EFFECT
| Form EFFECT - Notice of Effectiveness: |
| 04/12/2022 |
POS AM
| Form POS AM - Post-Effective amendments for registration statement: |
| 04/12/2022 |
S-8 POS
| Form S-8 POS - Securities to be offered to employees in employee benefit plans, post-effective amendments: |
| 04/12/2022 |
S-8 POS
| Form S-8 POS - Securities to be offered to employees in employee benefit plans, post-effective amendments: |
| 04/12/2022 |
S-8 POS
| Form S-8 POS - Securities to be offered to employees in employee benefit plans, post-effective amendments: |
| 04/11/2022 |
SC 13G/A
| WELLINGTON MANAGEMENT GROUP LLP reports a 3.2% stake in Houghton Mifflin Harcourt Company |
| 04/07/2022 |
8-K
| Termination of a Material Definitive Agreement, Completion of Acquisition or Disposition of Assets, Notice of Delisting or Fa... |
| 04/07/2022 |
25-NSE
| Form 25-NSE - Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities: |
| 04/07/2022 |
SC 14D9/A
| Form SC 14D9/A - Solicitation, recommendation statements: [Amend] |
| 04/07/2022 |
SC TO-T/A
| Form SC TO-T/A - Tender offer statement by Third Party: [Amend] |
| 03/29/2022 |
SC 14D9/A
| Form SC 14D9/A - Solicitation, recommendation statements: [Amend] |
| 03/29/2022 |
SC TO-T/A
| Form SC TO-T/A - Tender offer statement by Third Party: [Amend] |
| 03/22/2022 |
SC TO-T/A
| Form SC TO-T/A - Tender offer statement by Third Party: [Amend] |
| 03/07/2022 |
SC 14D9
| Form SC 14D9 - Solicitation, recommendation statements: |
| 03/07/2022 |
SC TO-T
| Form SC TO-T - Tender offer statement by Third Party: |
| 03/07/2022 |
8-K
| Quarterly results |
| 02/24/2022 |
SC14D9C
| Form SC14D9C - Written communication relating to third party tender offer: |
| 02/24/2022 |
10-K
| Annual Report for the period ended December 31, 2021 |
| 02/24/2022 |
8-K
| Quarterly results |
| 02/22/2022 |
SC14D9C
| Form SC14D9C - Written communication relating to third party tender offer: |
| 02/22/2022 |
SC TO-C
| Form SC TO-C - Written communication relating to an issuer or third party: |
| 02/22/2022 |
8-K
| Entry into a Material Definitive Agreement, Regulation FD Disclosure, Financial Statements and Exhibits Inte... |
| 02/14/2022 |
SC 13G/A
| ALLIANCEBERNSTEIN L.P. reports a 5.6% stake in Houghton Mifflin Harcourt Co |
| 02/14/2022 |
SC 13G
| Burgundy Asset Management reports a 8.6% stake in Houghton Mifflin Harcourt Co. |
| 02/10/2022 |
SC 13G
| VANGUARD GROUP INC reports a 5.2% stake in Houghton Mifflin Harcourt Co. |
| 02/04/2022 |
SC 13G/A
| Form SC 13G/A - Statement of acquisition of beneficial ownership by individuals: [Amend] |
| 02/03/2022 |
SC 13G/A
| Form SC 13G/A - Statement of acquisition of beneficial ownership by individuals: [Amend] |
| 11/04/2021 |
10-Q
| Quarterly Report for the period ended September 30, 2021 |
| 11/04/2021 |
8-K
| Quarterly results |
| 08/05/2021 |
10-Q
| Quarterly Report for the period ended June 30, 2021 |
| 08/05/2021 |
8-K
| Quarterly results |
|