Topstep Brokerage
ent_a67da6a4365cfce9610f8a65
Disclosures
9
State AG · 4 jurisdictions
Incidents
1
filings grouped by incident
Max affected reported
1,920
nationwide · State AG IN
Leak-site claims
0
none in sample
Identity resolution
- Canonical name
- Topstep Brokerage
- Normalized
- topstep brokerage— dedupe via name-norm; Microsoft / MSFT collapse to one row
- GLEIF LEI
- No match
- SEC EDGAR CIK
- None — not an SEC registrant
- Domain
- topstepbrokerage.com
Disclosure history (9)newest first
- 🏎️Indiana State AGas victim2026-01-20
Topstep LLC reported a data breach to the Indiana Attorney General. The breach occurred on 2025-12-14 and was reported on 2026-01-20. 11 Indiana residents were affected. 938 individuals affected in total.
- 🏎️Indiana State AGas victim2026-01-20
Topstep LLC reported a data breach to the Indiana Attorney General. The breach occurred on 2025-12-14 and was reported on 2026-01-20. 11 Indiana residents were affected. 938 individuals affected in total.
- 🍁Vermont State AGas victim2026-01-16
Topstep LLC reported a cybersecurity incident on December 14, 2025, involving credential stuffing attacks using stolen credentials from external sources. The attack may have granted unauthorized access to user accounts containing PII, including names, DOBs, government IDs, and SSNs. Topstep blocked malicious IPs, forced password resets, and is offering credit monitoring. The incident is currently contained.
- ⛰️New Hampshire State AGas victim2026-01-05
Topstep LLC notified the New Hampshire Attorney General of a security incident involving password stuffing. Between September 8 and October 16, 2025, unauthorized access occurred, potentially exposing names and Social Security numbers of one New Hampshire resident. Topstep discovered the breach on December 3, 2025, engaged cybersecurity experts, and began notifying affected individuals on December 30, 2025, offering credit monitoring services.
- 🏎️Indiana State AGas victim2025-12-30
Topstep LLC reported a data breach to the Indiana Attorney General. The breach occurred on 2025-09-08 and was reported on 2025-12-30. 4 Indiana residents were affected. 520 individuals affected in total.
- 🏎️Indiana State AGas victim2025-12-22
Topstep LLC reported a data breach to the Indiana Attorney General. The breach occurred on 2025-11-26 and was reported on 2025-12-22. 14 Indiana residents were affected. 1,920 individuals affected in total.
- ⛰️New Hampshire State AGas victim2025-12-22
Topstep LLC notified the New Hampshire Attorney General of a cybersecurity incident occurring on November 26, 2025. Cyber threat actors used credential-stuffing to gain unauthorized access to user accounts. The breach potentially exposed names, contact info, screen names, dates of birth, phone numbers, tax IDs, and Social Security Numbers for 1,920 individuals, including 2 New Hampshire residents. Topstep blocked IPs, forced password resets, and offered 24 months of Experian credit monitoring. Notices were mailed on December 22, 2025.
- 🦞Maine State AGas victim2025-12-22
Topstep LLC experienced a data breach due to an external system breach (hacking), affecting 1920 individuals, including 1 Maine resident.
- 🏎️Indiana State AGas victim2025-12-20
Topstep LLC reported a data breach to the Indiana Attorney General. The breach occurred on 2025-11-21 and was reported on 2025-12-20. 1 Indiana residents were affected. 37 individuals affected in total.