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BreachRecord

Prosper Marketplace, Inc Data Breach (December 2025): What Was Exposed and What To Do

Last updated Oct 20, 2026 · Based on 3 official filings · See sources

According to the notice filed with the Washington State Attorney General on Dec 9, 2025, Prosper Marketplace, Inc reported a data breach. It was also reported to the California Attorney General and the Texas Attorney General. People affected: 13,076,476 people (official total in the Texas Attorney General filing, filed Dec 10, 2025).

Key facts

From 3 official filings
Organization
Prosper Marketplace, Inc
Also filed as: Prosper Marketplace, Inc.
Source: Washington State Attorney General, filed Dec 9, 2025
People affected
13,076,476
Official total in the Texas Attorney General filing, filed Dec 10, 2025
Source: Texas Attorney General, filed Dec 10, 2025
Incident dates
Apr 29, 2025 – Sep 2, 2025
Source: Washington State Attorney General, filed Dec 9, 2025
Discovered Sep 1, 2025
Source: Washington State Attorney General, filed Dec 9, 2025
Notice dates
First filed Dec 9, 2025; latest filing Dec 10, 2025
Source: Washington State Attorney General, filed Dec 9, 2025
Information exposed
  • Social Security number
  • Government ID number
  • Financial account number
  • Date of birth
  • Name
  • Other information
Sources: Washington AG, Dec 9, 2025; Texas AG, Dec 10, 2025
Filed with
Free credit monitoring
No offer is stated in the filings we have. Check your letter.

What to do now

Steps chosen from the information listed in the official filings. Your own letter may list more.

  1. A credit freeze stops new credit accounts being opened in your name. It is free by law and you can lift it when you need credit: Equifax, Experian and TransUnion.

  2. An IP PIN stops someone else filing a tax return with your Social Security number. Get one from the IRS at irs.gov.

  3. Review recent transactions, ask about account alerts, and ask whether a new account number is recommended.

  4. Scammers often contact people after a breach, pretending to be the organization, a bank or a government agency. Do not give your Social Security number, passwords or codes to anyone who contacts you first.

  5. You can get free credit reports from all three bureaus at AnnualCreditReport.com, the official site.

  6. The Federal Trade Commission's IdentityTheft.gov gives you a personal recovery plan.

Is the letter real?

The agency published an official copy of the notice. Compare your letter with it:

Letters usually list a phone number for questions. Before calling, check that it matches the number in the official copy linked above.

Never give your Social Security number, bank details or passwords to someone who contacts you first.

Timeline

  1. Incident began (earliest date reported) source
  2. Organization discovered the incident source
  3. Incident ended (latest date reported) source
  4. Reported to Washington AG and California AG source
  5. Reported to Texas AG source

Sources

  1. Washington State Attorney General Notice filed Dec 9, 2025
    Filed as “Prosper Marketplace, Inc” · 249,848 Washington residents · Official copy of the letter
    The link opens the Attorney General's list of notices.
  2. California Attorney General Notice filed Dec 9, 2025
    Filed as “Prosper Marketplace, Inc.”
  3. Texas Attorney General Notice filed Dec 10, 2025
    Filed as “Prosper Marketplace, Inc” · 1,161,581 Texas residents · total 13,076,476
    The link opens the agency's list; search it for the organization name.

Last updated Oct 20, 2026. Our summaries are written in our own words from the official filings above. Spotted an error? Report a correction.