Stockman Bank of Montana — May 2023 breach

Clustered 5 filings across 5 jurisdictions · filing window Aug 7, 2023 → Aug 8, 2023. View entity profile → Other incidents for this victim →

⚠ 2 cross-filing discrepancies →Merge100%

Determination

Confirmed

Members

5 filings

States

Affected · reported

5,115

First → last filing

Aug 7, 2023 → Aug 8, 2023

Merge confidence

100%

incident inc_0063d4cc20de4d69 · merged by deterministic · confidence 100%

Part of the Progress Software Corporation supply-chain incident (2023) — at least 97 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 28, 2023–May 31, 2023, discovered May 31, 2023 — the first regulatory filing landed 68 days later. 5,115 individuals reported across the linked filings. Data reported: Government ID, PII, Identity (basic), and 1 more. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Notification delay

68days

Discovered → first regulatory filing

Discovery variance

65days

Range of discovered_at dates across filings

Filing span

1days

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 clocksMaine✓ ME AG ≤30d · 4dMassachusetts✓ MA credit monitoring dueFull clock table in Litigation Timeline

No cross-filing comparison data available for this incident.

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