DisclosureLens
HackingFinancial ServicesFinanceDoSCustomer Data InvolvedPIIIdentity (basic)LowContained

Topstep LLC

bd_716ada46a8c7b0a2 · schema v1 · pii pii-v2

Severity

Low

Discovered

Sep 8, 2025

Filed

Dec 30, 2025

To disclose

—

Affected

Not disclosed

Linked

5 filings

Confidence

65%
Full breach record for Topstep LLC →2 incidents on file

Topstep LLC notified Nebraska residents of a data security incident detected on September 8, 2025, involving a DDoS attack that may have led to unauthorized access to customer accounts. The company discovered on December 3, 2025, that PII was potentially accessed between September 8 and October 16, 2025. Topstep engaged external cybersecurity professionals and is offering complimentary credit monitoring and fraud assistance via Cyberscout (TransUnion).

Incident timeline

Sep 8, 2025

Begins

Sep 8, 2025

Discovered

Dec 30, 2025

Filed

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

Filing propagation · 5 filings · 3 states

View merged incident ↗
Texas State AGDec 22 · first
Nebraska State AGDec 22 · first
Massachusetts State AGDec 22 · first
Massachusetts State AG+8d
Nebraska State AG+8d · this page

Pattern: first filing Dec 22 (TX), last Dec 30 (NE) — a 8-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 filingThis record

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

SEC 8-K / victim statement

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