# Duo Security

> Cloud multi-factor authentication and zero-trust access platform — acquired by Cisco.

## Why it is interesting

Ann Arbor’s defining security exit: Cisco completed Duo acquisition for $2.35B cash (Oct 1, 2018); company was HQ’d in Ann Arbor at deal.

## Profile

- **Latest funding:** Not publicly disclosed
- **Latest known valuation:** Not publicly disclosed
- **Total disclosed equity funding:** Not publicly disclosed
- **Stage:** acquired
- **Status:** acquired
- **Industries:** cybersecurity, enterprise-saas
- **Coverage:** full
- **Last updated:** 2026-07-26

## Key facts

- Acquired by Cisco for $2.35B cash (completed Oct 1, 2018)
- HQ at acquisition: Ann Arbor, MI
- Founders: Dug Song, Jonathan Oberheide (2010)
- Product: MFA + zero-trust access (Duo Beyond)

## Funding history

- Acquisition · $2.35B · October 2018
  Source: https://investor.cisco.com/news/news-details/2018/Cisco-Completes-Acquisition-of-Duo-Security/default.aspx

**By:** [Venture Capital Tracker](https://venturecapitaltracker.com/editorial-policy)
**Last updated:** July 26, 2026

**Editorial note:** AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.

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Source: https://venturecapitaltracker.com/startup/duo-security