HackingFinancial ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedDelayed DiscoveryGovernment IDFinancial accountPIIHighContained

Prosper Marketplace, Inc.

bd_d6c1820c7624a9c4 · schema v1 · pii pii-v1

Severity

High

Discovered

Sep 1, 2025

Filed

Dec 9, 2025

To disclose

14 weeks

Affected

1,008state residents only

Linked

14 filings

Confidence

66%

Full breach record for Prosper Marketplace, Inc. →3 incidents on file

Prosper Marketplace, Inc. notified the Iowa AG of a security incident discovered on September 1, 2025. Unauthorized actors accessed data of approximately 1,008 Iowa residents between June and August 2025. Compromised data included SSNs, dates of birth, and bank account numbers. Prosper engaged Mandiant, notified law enforcement, and is offering two years of credit monitoring.

J jump to incidentP pin to compareR raw source

Iowa clock✓ IA AG ≤5 bday14 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 92 days

discovery → filing · 14 weeks / 99 days

Jun 1, 2025

Begins

Sep 1, 2025

Discovered

Dec 9, 2025

Filed

vs. sector median

+6 wks slower

This filing is one of 14 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Indiana State AGbd_064375e1021db3242025-12-09Verified
Delaware State AGbd_0e596803e4bc415f2025-12-09Verified
California State AGbd_1d8dc2966340fc3f2025-12-09Verified
Washington State AGbd_371b15508a6d2c9c2025-12-09Verified

Show 6 more filings ↓up to 2d gap

Montana State AGbd_9747b8377985ec6c2025-12-09Verified
Nebraska State AGbd_d38f45326410ee322025-12-09Verified
Nebraska State AGbd_d7d33fc3f88c47e62025-12-09Verified
Massachusetts State AGbd_e27f6e5b922dd85d2025-12-09Verified
Texas State AGbd_a95dd486a1b3cf8d2025-12-10 · +1dVerified
South Carolina State AGbd_7e60fb558f4916482025-12-11 · +2dVerified

Showing first 10 of 13 linked disclosures.

Name: Orrick, Herrington & Sutcliffe LLP
norm: orrick herrington sutcliffe
Domain: orrick.com

Name: Prosper Marketplace, Inc.
norm: prosper marketplace
Domain: prosper.com
Industry: Financial Servicesllm

Discovered: Sep 1, 2025
Breach occurred: Jun 1, 2025 – Aug 31, 2025
Undetected for: 92 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 9, 2025
Affected individuals: 1,008state-resident count only
Data types: Government IDFinancial accountPII
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1119 Automated CollectionT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Notified Iowa Attorney General
Initial access: valid_credentials

During the incident: Activated its incident response process
Took prompt steps to stop the activity and strengthen its security measures
Engaged Mandiant, a leading cybersecurity firm, and other outside advisors to investigate
Notified law enforcement
Changes made: Implemented enhanced security and monitoring controls
Offered two years of complimentary credit monitoring and identity restoration services from Experian
Established a dedicated call center to address questions related to this event
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(99 days from discovery to filing)
Compliance flags: IA AG ≤5 bday
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 10 states

View merged incident ↗

Indiana State AGDec 9 · first

Delaware State AGDec 9 · first

California State AGDec 9 · first

Washington State AGDec 9 · first

Montana State AGDec 9 · first

Nebraska State AGDec 9 · first

Massachusetts State AGDec 9 · first

Iowa State AGDec 9 · first · this page

Texas State AG+1d

South Carolina State AG+2d

Cascade drawn from the first 10 linked disclosures of 13 — the full spread may be wider.

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.

Source URL: https://www.iowaattorneygeneral.gov/media/cms/1292025_Prosper_Marketplace_Inc_7CC4AE3E67C30.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 9, 2025
Raw hash: 42a379f1bb6b6e3d3a01ddf7c6eb0117e2e082fb618091b85c86e4769f939789

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityOrrick, Herrington & Sutcliffe LLP

Victim entityProsper Marketplace, Inc.

Incidentdiscovered Sep 1, 2025

Stated responseActivated its incident response process

ComplianceIA AG ≤5 bday

Extraction provenanceno artifact recorded

Source provenancewww.iowaattorneygeneral.gov