YC F25 Startup Multifactor Raises $15M Seed Round to Make Online Accounts Safe for AI Agents
Summary
Multifactor raised a $15 million seed round led by Nexus Venture Partners, with participation from Y Combinator and several other investors. The company builds a security platform that lets people and AI agents access online accounts without exposing passwords or credentials. Its product uses post-quantum cryptography, revocable access links, and audit trails to support safe, shareable account access. The company says the platform addresses growing agentic AI security risks such as prompt injection, password theft, and cross-agent hijacking. Multifactor says its free account manager is now available to the public.
Funding
Amount
$15.0M
Total raised
Date
December 4, 2025
Announcement date
Investors
Pioneer Fund, Taurus Ventures, Y Combinator, Flex Capital
Lead investors
Company
multifactor.com
Funded company
Classifications
industries
Fintech & Banking
applications
Security
AskAI Classifications
Labels
Cybersecurity Software
Identity and Access Management
Password Manager Software
Linked Companies
Multifactor, Inc.
$1M to $5M