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Houghton Mifflin Harcourt Company
hmhco.comHoughton Mifflin Harcourt Company was listed on the ShinyHunters leak site on Jul 8, 2025. Brandefense has recorded 2 separate claims against it. Information as of Oct 19, 2026.
Country: United StatesIndustry: Education and Research
Updated continuously · figures as of Oct 19, 2026- Claimed by
- ShinyHunters
- First listed
- Jul 8, 2025
- Claims recorded
- 2
2 Leak-Site Claims.
ShinyHuntersConfirmed claim
- Posted on the leak site
- May 9, 2026
- Collected by Brandefense
- May 9, 2026
- Data claimed
- Not stated
Your data was compromised in several of our campaigns throughout the past few months. We urge you to engage with us, it is in your best interests. This is a final warning to reach out by 12 May 2026 before we leak along with several annoying (digital) problems that'll come your way. Make the right decision, don't be the next headline.
ShinyHuntersConfirmed claim
- Posted on the leak site
- Jul 8, 2025
- Collected by Brandefense
- Oct 3, 2025
- Data claimed
- Not stated
HMH, or Houghton Mifflin Harcourt, is a long-established publishing company specializing in educational content. They provide a variety of instructional technology, assessments, and other learning materials to schools in over 150 countries. The company also publishes a number of well-known trade and reference works, alongside children's books. Their goal is to foster a lifelong love of learning in every individual they serve.
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Other Victims In The Same Industry.
| Victim | Claimed by | Country | Industry | Data claimed | Posted |
|---|---|---|---|---|---|
| The Akeeli Group theakeeligroup.com | N0n | USUnited States | Education and Research | Not stated | |
| Llano Independent School District llanoisd.org | Qilin | USUnited States | Education and Research | Not stated | |
| Solid Trading B.V. solid-fx.com | N0n | NLNetherlands | Education and Research | Not stated | |
| First Brothers Co., Ltd firstbrothers.com | Qilin | JPJapan | Education and Research | Not stated | |
| Wellington College International School Bangkok wellingtoncollege.ac.th | The Gentlemen | THThailand | Education and Research | Not stated | |
| nowaszkola.com nowaszkola.com | INC Ransom | PLPoland | Education and Research | Not stated |
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