In 2025, the most significant registered case of a data compromise in the United States, based on the number of affected individuals, was the PowerSchool data breach. As a result of this cyberattack, it is estimated that 71.9 million victim notices were made regarding this case.
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Identity Theft Resource Center. (January 23, 2026). Most significant cases of personal data violations in the United States in 2025, by number of victims (in millions) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 28, 2026, from /statistics/1367174/us-biggest-data-leakage-by-number-of-victims/
Identity Theft Resource Center. "Most significant cases of personal data violations in the United States in 2025, by number of victims (in millions)." Chart. January 23, 2026. ÌÇÐÄÆƽâ°æ. Accessed July 28, 2026. /statistics/1367174/us-biggest-data-leakage-by-number-of-victims/
Identity Theft Resource Center. (2026). Most significant cases of personal data violations in the United States in 2025, by number of victims (in millions). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 28, 2026. /statistics/1367174/us-biggest-data-leakage-by-number-of-victims/
Identity Theft Resource Center. "Most Significant Cases of Personal Data Violations in The United States in 2025, by Number of Victims (in Millions)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 23 Jan 2026, /statistics/1367174/us-biggest-data-leakage-by-number-of-victims/
Identity Theft Resource Center, Most significant cases of personal data violations in the United States in 2025, by number of victims (in millions) ÌÇÐÄÆƽâ°æ, /statistics/1367174/us-biggest-data-leakage-by-number-of-victims/ (last visited July 28, 2026)
Most significant cases of personal data violations in the United States in 2025, by number of victims (in millions) [Graph], Identity Theft Resource Center, January 23, 2026. [Online]. Available: /statistics/1367174/us-biggest-data-leakage-by-number-of-victims/
