Topstep Brokerage — September 2025 breach

Clustered 10 filings across 5 jurisdictions · filing window Dec 20, 2025 → Jan 20, 2026. View entity profile → Other incidents for this victim →

⚠ 2 cross-filing discrepancies →Merge100%

Determination

Confirmed

Members

10 filings

States

Affected · reported

1,922

First → last filing

Dec 20, 2025 → Jan 20, 2026

Merge confidence

100%

incident inc_25d81c2f34ae43af · merged by deterministic · confidence 100%

Confirmed breach. Merged as one breach: 10 regulatory filings. The filings describe hacking. Intrusion Sep 8, 2025–Dec 14, 2025, discovered Sep 8, 2025 — the first regulatory filing landed 103 days later. 1,922 individuals reported across the linked filings. Data reported: Government ID, Identity (basic), Financial, and 2 more. Notifications rolled out on a 31-day schedule across 10 filings beginning Dec 20, 2025. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Supplemental

Notification delay

103days

Discovered → first regulatory filing

Discovery variance

98days

Range of discovered_at dates across filings

Filing span

31days

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 bdayMaine✓ ME AG ≤30d · 17dFull clock table in Litigation Timeline

No cross-filing comparison data available for this incident.

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