Multifactor YC Application

Fall 2025Active

Multifactor went through Y Combinator in the Fall 2025 batch as a B2B company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.

YC batch: Fall 2025
Industry: B2BSecurity
Team size: 6
Status: Active
Launched: 2025

Founders

Vivek NairFounder & CEO

What Multifactor does

The agentic era is here, but its foundation is dangerously insecure. A growing number of high-profile "AI agent gone rogue" security incidents make headlines each week. As enterprise adoption of agentic software has far outpaced the development of applicable cybersecurity solutions, CISOs have loudly voiced a growing need for verifiable, fine-grained security controls on complex multi-agent systems. That's why we built Multifactor. Multifactor offers best-in-class authentication, authorization, and auditing technologies for agentic systems, allowing users to securely and revocably share online accounts with agents while maintaining fine-grained permissions and a detailed event history. We are doing for AI security what Cloudflare did for web security, Okta did for identity security, and Wiz did for cloud security: defining the category. A world-class "account manager" that allows agents to securely use online accounts on your behalf is just the start - our early enterprise partners include companies using AI agents to manage $7.5+ billion manufacturing supply chains, where the consequences for lapses in security are severe. Our patented AI security technology seamlessly integrates with existing agentic software to thwart attacks like prompt injection, so CISOs and end users alike can breathe a sigh of relief, without slowing the pace of AI adoption.

Multifactor's YC application, reconstructed

Y Combinator application

Multifactor, Fall 2025 batch. The real form questions, answered from public data.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

Multifactor

Describe what your company does in 50 characters or less.

Zero-trust AI agent security

What is your company going to make? Please describe your product and what it does or will do.

We are building authentication, authorization, and auditing tools designed specifically for AI agents acting on behalf of users. Our product lets enterprises securely share online accounts with AI agents, enforce fine-grained permissions, and get detailed logging of agent actions. We protect against breaches like rogue agents or prompt injection attacks.

Where do you live now, and where would the company be based after YC?

We are currently based in San Francisco and would remain headquartered here after YC.

Explain your decision regarding location.

San Francisco is our home and the hub for enterprise security and AI startups. It gives us access to customers, talent, and investors who understand the complexities of AI security.

21 more answers in the full application

Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.

See full application

Frequently Asked Questions

Is this the real Multifactor YC application?

No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Multifactor's public data (launch notes, founder backgrounds, product description). It shows how a company like Multifactor would present itself to YC, not the text they submitted.