FEDERALItem 1.05 · mandatoryMalwareFinancial ServicesFinanceRansomwareData EncryptedMulti-Stage ChainPIILowActive

River Financial Corporation

bd_b49f2a1e760cb3ea · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 19, 2026

Filed

Jun 25, 2026

To disclose

6 days

Affected

Not disclosed

Linked

5 filings

Confidence

68%

Full breach record for River Financial Corporation →

River Financial Corporation (including River Bank & Trust) filed an 8-K disclosing a material cybersecurity incident. On or about June 16, 2026, an unauthorized threat actor gained access to the network, deploying ransomware across portions of the server environment. River identified the activity on June 19, 2026, and took containment measures, including disabling accounts and taking systems offline. The investigation into the scope and whether PII was exfiltrated is ongoing.

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SEC clockMateriality determined Jun 19, 2026 → Filed Jun 25, 20266d ✓ SEC 4-day OK6 days discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 3 days

discovery → filing · 7 days

Jun 16, 2026

Begins

Jun 19, 2026

Discovered

Jun 25, 2026

Filed

vs. sector median

8 wks faster

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

SEC 8-Kbd_712200f8a5f0b33a2026-07-06 · +11dVerified by operator
SEC 8-Kbd_5003c9d941db0a9c2026-07-10 · +15dVerified by operator
SEC 8-Kbd_994819586d228b3b2026-07-17 · +22dVerified by operator
SEC 8-Kbd_a605d6d2312874f32026-07-30 · +35dVerified

Name: River Financial Corporation
norm: river financial
SEC CIK: 0001641601

Name: River Financial Corporation
norm: river financial
Industry: Financial Servicesllm

Discovered: Jun 19, 2026
Breach occurred: Jun 16, 2026
Undetected for: 3 daysoccurrence → discovery
Materiality determined: Jun 19, 2026
Notification sent: Jun 25, 2026
Affected individuals: Not disclosed
Data types: PII
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial

During the incident: Disabled affected administrative accounts
Taking impacted systems offline
River, with the assistance of a third-party forensic firm, is investigating the nature and scope of the incident
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 days(6 days from discovery to filing)
Compliance flags: SEC 4-day OK · 6d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
Clock breakdown: Statute Window Elapsed Threshold Status
SEC
Materiality determined: Jun 19, 2026
→ Filed: Jun 25, 2026
6d cal. 4 business days SEC 4-day OK

Statute	Window	Elapsed	Threshold	Status
SEC	Materiality determined: Jun 19, 2026 → Filed: Jun 25, 2026	6d cal.	4 business days	SEC 4-day OK

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings

View merged incident ↗

SEC 8-KJun 25 · first · this page

SEC 8-K+11d

SEC 8-K+15d

SEC 8-K+22d

SEC 8-K+35d

Pattern: first filing Jun 25, last Jul 30 — a 35-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statementThis record

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.sec.gov/Archives/edgar/data/1641601/000119312526282946/ck0001641601-20260619.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Jun 25, 2026
Raw hash: 3de75579c2afd254cade8609beedc876f77c087c9a7560862af8aa3ac2157e95

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Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityRiver Financial Corporation

Victim entityRiver Financial Corporation

Incidentdiscovered Jun 19, 2026

Stated responseDisabled affected administrative accounts

ComplianceSEC 4-day OK

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing