Houghton Mifflin Harcourt Company — Ransomware Incident Claimed by ShinyHunters
- Victim: Houghton Mifflin Harcourt Company
- Claimed by ShinyHunters
- Date claimed: 2026-05-09
- Country: US
- Sector: Education
ShinyHunters listed Houghton Mifflin Harcourt Company, an Education organization, as a victim on its data-leak site (2026-05-09).