Topstep LLC — September 2025 breach

Clustered 5 filings across 3 jurisdictions · filing window Dec 22, 2025 → Dec 30, 2025. View entity profile → Other incidents for this victim →

⚠ 2 cross-filing discrepancies →Merge100%

Determination

Confirmed

Members

5 filings

States

Affected · reported

1,920

First → last filing

Dec 22, 2025 → Dec 30, 2025

Merge confidence

100%

incident inc_7baa0c5060b74cd2 · merged by deterministic · confidence 100%

Confirmed breach. Merged as one breach: 5 regulatory filings. The filing describes unauthorized access. Intrusion Sep 8, 2025–Nov 28, 2025, discovered Sep 8, 2025 — the first regulatory filing landed 105 days later. 1,920 individuals reported across the linked filings. Data reported: Government ID, Identity (basic), and PII. Notifications rolled out on a 8-day schedule across 5 filings beginning Dec 22, 2025. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Supplemental

Notification delay

105days

Discovered → first regulatory filing

Discovery variance

88days

Range of discovered_at dates across filings

Filing span

8days

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 clocksMassachusetts✓ MA credit monitoring dueFull clock table in Litigation Timeline

No cross-filing comparison data available for this incident.

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