🏎️Indiana State AGlinked via multistate filing link · 100%
Clustered 4 filings across 4 jurisdictions · filing window Jun 6, 2025 → Jun 12, 2025. View entity profile → Other incidents for this victim →
incident inc_dd8b18b081d442da · merge_method deterministic · confidence 100%
Discovered → first regulatory filing
Range of discovered_at dates across filings
PII · Identity (basic)
Time between earliest and latest filing
Not recorded for this incident
Leak precedence · Materiality delta · SEC filing delay — no leak-site claim in this cluster; no SEC 8-K in this cluster.
IN ME NH VT
all State AG
per-filing reported counts
State AGs report only their own residents; bars show per-filing counts.
Earliest sighting first · deep chronology in Litigation Timeline
Sep 14, 2024
When the intrusion reportedly occurred, per the linked filings
Sep 15, 2024
Reported by VERMONT AG, MAINE AG, NEW HAMPSHIRE AG filings
About this clustering
DisclosureLens links filings into incidents through layered matchers: deterministic rules (same source document, multistate filings of one breach, tight-window same-victim pairs), a weighted-similarity scorer for cross-source candidates, and an operator review queue for everything uncertain. Each link records its own method and confidence — shown per filing in the timeline below. The system defaults to NOT merging when uncertain, because a false merge (collapsing two unrelated breaches) is more harmful than a false split (showing related filings separately); uncertain pairs route to human review instead of auto-merging. Filing summaries shown in the timeline are AI-generated extracts — verify each against its linked source.
Mastery Charter High School reported a data breach to the Indiana Attorney General. The breach occurred on 2024-09-14 and was reported on 2025-06-06. 1 Indiana residents were affected. 37,031 individuals affected in total.
Affected (this filing): 37,031
Mastery Charter High School experienced a cybersecurity incident in September 2024 involving malicious encryption attributed to an unauthorized actor. The incident resulted in data exfiltration and affected personal information including names. The school shut down systems, engaged cybersecurity professionals, reported to federal law enforcement, and offered credit monitoring to affected individuals.
Mastery Charter High School, an education entity based in Philadelphia, PA, reported an external system breach (hacking) occurring between September 14 and 16, 2025. The incident affected a total of 37,031 individuals, including 4 Maine residents. The breach was discovered on September 15, 2024. The entity provided written notification to affected individuals on June 6, 2025, and offered 12 months of Experian IdentityWorks identity monitoring and restoration services.
Affected (this filing): 37,031
Mastery Charter High School notified the NH AG of a September 15, 2024 ransomware incident affecting 5 NH residents. Malicious encryption and data downloads occurred. Response included system shutdown, law enforcement notification, and MFA expansion. Affected data: names. Free credit monitoring offered.
Affected (this filing): 5