# Prosper Marketplace Inc.: data breach notice filed with the Delaware Attorney General (2025-12-09)

**Score:** 40/100

| Field | Value |
|---|---|
| Organization | Prosper Marketplace Inc. |
| Attorney General notified | DE |
| Notice date | 2025-12-09 |
| Breach dates | 2025-04-29 |
| State residents affected | 48,397 |
| Total affected (all states) | 13,076,476 |
| Data exposed | Social Security number, Federal identification card number, Account number, credit card account number, or debit card number, in combination with any required security code, access code, or password that would permit access to a financial account |
| Notice letter | https://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2026/01/Prosper_Sample-Individual-Notice-12-09-25.pdf |
| Days from discovery to notice | 99 |

## Why this score
- 10,000+ residents affected.

Source: Washington State Attorney General data breach notifications (data.wa.gov) and California Attorney General data security breach list (oag.ca.gov) (https://data.delaware.gov/d/dir6-wx8v). Last refreshed: 2026-11-04T06:06:58.316Z.
From the Washington, California and Delaware Attorney General breach notification lists, as posted. A notice is the organization's own report under state breach-notification law; it is not a finding of wrongdoing or of harm. California does not publish cause or counts in its list; Delaware lists data types and counts but not cause. Read the notice on the AG site before relying on it.