As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

 4/21/22  Houghton Mifflin Harcourt Co.     15-12B      4/21/22    1:11K                                    Donnelley … Solutions/FA 
 4/12/22  Houghton Mifflin Harcourt Co.     POS AM                 1:20K                                    Donnelley … Solutions/FA 
 4/12/22  Houghton Mifflin Harcourt Co.     S-8 POS     4/12/22    1:21K                                    Donnelley … Solutions/FA 
 4/12/22  Houghton Mifflin Harcourt Co.     S-8 POS     4/12/22    1:21K                                    Donnelley … Solutions/FA 
 4/12/22  Houghton Mifflin Harcourt Co.     S-8 POS     4/12/22    1:21K                                    Donnelley … Solutions/FA 
  4/7/22  Houghton Mifflin Harcourt Co.     8-K:1,2,3,5  4/7/22   13:268K                                   Donnelley … Solutions/FA 
  4/7/22  Houghton Mifflin Harcourt Co.     SC 14D9/A              1:18K  Houghton Mifflin Harcourt Co.     Donnelley … Solutions/FA 
 3/29/22  Houghton Mifflin Harcourt Co.     SC 14D9/A              1:17K  Houghton Mifflin Harcourt Co.     Donnelley … Solutions/FA 
 3/23/22‡ Houghton Mifflin Harcourt Co.     8-K:1,9     3/21/22   11:156K                                   Donnelley … Solutions/FA 
 3/23/22‡ Houghton Mifflin Harcourt Co.     SC 14D9/A              5:155K Houghton Mifflin Harcourt Co.     Donnelley … Solutions/FA 
 3/17/22‡ Houghton Mifflin Harcourt Co.     SC 14D9/A              2:70K  Houghton Mifflin Harcourt Co.     Donnelley … Solutions/FA 
  3/7/22  Houghton Mifflin Harcourt Co.     SC 14D9                2:605K Houghton Mifflin Harcourt Co.     Donnelley … Solutions/FA 
 2/22/22  Houghton Mifflin Harcourt Co.     8-K:1,7,9   2/21/22   12:814K                                   Donnelley … Solutions/FA 
 5/28/21  Houghton Mifflin Harcourt Co.     SD         12/31/20    1:43K                                    ActiveDisclosure/FA      
 5/19/21  Houghton Mifflin Harcourt Co.     8-K:5,9     5/14/21   11:291K                                   ActiveDisclosure/FA      
11/23/20  Houghton Mifflin Harcourt Co.     CORRESP¶   12/28/20    1:6K                                     Donnelley … Solutions/FA 
 11/5/20  Houghton Mifflin Harcourt Co.     10-Q        9/30/20   80:12M                                    ActiveDisclosure/FA      
 10/6/20  Houghton Mifflin Harcourt Co.     8-K:5,9     9/30/20   11:333K                                   ActiveDisclosure/FA      
 10/1/20  Houghton Mifflin Harcourt Co.     8-K:2,9     9/30/20   11:201K                                   ActiveDisclosure/FA      
  9/8/20  Houghton Mifflin Harcourt Co.     8-K:2        9/4/20   10:153K                                   ActiveDisclosure/FA      

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‡	A non-Insider-Ownership Filing that was accepted after the SEC “closed” at 5:30:00pm ET.  The legal “Filed As Of” date may be the next, or another, day.
¹	Filing/Form Types:  -K
	8-K	Current Report — Form 8-K { Item 1: Business & Operations;  2: Financial Info;  3: Securities & Trading;  4: Accountants & Accounting;  5: Governance & Management;  6: Asset-Backed Securities;  7: Disclosures;  8: Events;  9: Financials }.
	10-Q	Quarterly Report — Form 10-Q.
	15-12B	Certification of a Termination of Registration of a Class of Securities — Form 15.
	CORRESP	Comment-Response or Other Letter to the SEC.
	POS AM	Post-Effective Amendment of a Registration Statement.
	S-8 POS	Post-Effective Amendment of a Form S-8 Registration.
	SC 14D9	Tender-Offer Solicitation/Recommendation Statement — Schedule 14D-9.
	SD	Specialized Disclosure Report re: the Use of Conflict Minerals — Form SD.
	/A	Amendment to, or Amended version of, a previous Filing of this Type.
	¶	This Filing contains a delayed-release Document.