THE MEDICAL COLLEGE OF WISCONSIN, INC. — May 2023 breach

Clustered 5 filings across 5 jurisdictions · filing window Nov 14, 2023 → Nov 20, 2023. View entity profile → Other incidents for this victim →

⚠ 1 cross-filing discrepancy →Merge100%

Determination

Confirmed

Members

5 filings

States

Affected · reported

240,667

First → last filing

Nov 14, 2023 → Nov 20, 2023

Merge confidence

100%

incident inc_b47a7b2d4434416b · merged by deterministic · confidence 100%

Part of the Progress Software Corporation supply-chain incident (2023) — at least 96 organizations filed notifications naming this third party.

Confirmed breach. Merged as one breach: 5 regulatory filings. The filings describe a third-party compromise. Intrusion May 27, 2023, discovered Sep 21, 2023 — the first regulatory filing landed 54 days later. 240,667 individuals reported across the linked filings. Data reported: Government ID, PII, Identity (basic), and 3 more. Notifications rolled out on a 6-day schedule across 5 filings beginning Nov 14, 2023. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Notification delay

54days

Discovered → first regulatory filing

Discovery variance

0days

Range of discovered_at dates across filings

Filing span

6days

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.

Regulatory clocksVermont⏱ VT AG >14 bdayHIPAA✓ HHS notifiedMassachusetts✓ MA credit monitoring dueFull clock table in Litigation Timeline

No cross-filing comparison data available for this incident.

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