Clustered 4 filings across 4 jurisdictions · filing window Apr 17, 2026 → Apr 18, 2026. View entity profile → Other incidents for this victim →
incident inc_33ada32bd7264cbc · merge_method deterministic · confidence 100%
Discovered → first regulatory filing
Range of discovered_at dates across filings
IN ME NH VT
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.
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 28, 2025
When the intrusion reportedly occurred, per the linked filings
Oct 21, 2025
Reported by NEW HAMPSHIRE AG, MAINE AG filings
Hallisey & D'Agostino LLP reported a data breach to the Indiana Attorney General. The breach occurred on 2025-09-28 and was reported on 2026-04-17. 10 Indiana residents were affected. 16,683 individuals affected in total.
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.
Affected (this filing): 16,683
Hallisey & D’Agostino, LLP, a tax and accounting firm, reported a cybersecurity incident to the New Hampshire Attorney General on April 17, 2026. Unauthorized access occurred between September 28 and October 22, 2025. The breach potentially exposed names, Social Security numbers, driver's license numbers, and financial account information of 981 New Hampshire residents. The firm engaged forensic experts, notified the FBI, and offered 12 months of credit monitoring and identity theft protection services to affected individuals.
Affected (this filing): 981
Hallisey & D'Agostino, LLP, a Connecticut-based tax and accounting firm, experienced an external network breach between September 28 and October 22, 2025. Unusual activity was identified on October 21, 2025. An unknown actor gained unauthorized access and potentially acquired files containing personal information. A comprehensive data review concluded March 19, 2026. 74 Maine residents and 16,683 total individuals were affected. IDX identity protection services (12 months) were offered.
Affected (this filing): 74
Hallisey & D'Agostino, LLP reported a data breach to the Vermont Attorney General. The breach was reported to the AGO on 2026-04-18. The reporting organization type is Other Commercial. 182 Vermont residents were affected. Categories of data breached: Social Security Numbers.