HackingStolen CredentialsData ExfiltratedCustomer Data InvolvedDelayed DiscoveryIDENTITY_BASICIDENTITY_GOVERNMENTFINANCIAL_ACCOUNTHighContained
Topstep Brokerage
bd_204febfe40a8a423 · schema v1 · pii pii-v1
Full breach record for Topstep Brokerage →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.
This filing is one of 9 about the same incident.View merged incident
Linked disclosures
Why this link?Regulatory filings (8) · sorted by filing gap
- bd_0a892e5fb23ecfefIndiana State AGfiled 2025-12-22Verified
- bd_ac7762ff013459daMaine State AGfiled 2025-12-22Candidate
- bd_f926e2f8532bba86Indiana State AGfiled 2025-12-20(2d gap)Verified
- bd_865cfabcd1482f64Indiana State AGfiled 2025-12-30(8d gap)Verified
Show 4 more filings ↓Show fewer ↑up to 29d gap
- bd_1ba3a5d6f8186b38New Hampshire State AGfiled 2026-01-05(14d gap)Verified
- bd_feda97c361d06998Vermont State AGfiled 2026-01-16(25d gap)Verified
- bd_d103e7440b81fd37Indiana State AGfiled 2026-01-20(29d gap)Verified
- bd_e1bd3f7d6444d49fIndiana State AGfiled 2026-01-20(29d gap)Verified
Source provenance
- Source URL
- https://mm.nh.gov/files/uploads/doj/remote-docs/topstep-20251222.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
- Filed at
- Dec 22, 2025
- Raw hash
- be150cf038b91c2e207faaa7b30544e1d4ab961b44162a83c5ddf34dab07e16e
Reporting entity
- Name
- Topstep Brokeragenorm: topstep brokerage
- Domain
- topstepbrokerage.com
Victim entity
- Name
- Topstep Brokeragenorm: topstep brokerage
- Domain
- topstepbrokerage.com
Incident
- Discovered
- Nov 26, 2025
- Materiality determined
- —
- Notification sent
- Dec 22, 2025
- Affected individuals
- 1,920
- Data types
- IDENTITY_BASICIDENTITY_GOVERNMENTFINANCIAL_ACCOUNT
- Attack vector
- Unauthorized Access
- MITRE ATT&CK
- T1110 Brute ForceT1078 Valid Accounts
- Threat actor
- ExternalFinancial
- Regulator citations
- Notified New Hampshire Office of Consumer Protection
- Initial access
- valid_credentials
Compliance
- Time to disclose
- 26 days(26 days from discovery to filing)
- Compliance flags
- — (clock not assessable for this source)
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.