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Draft:Duo Security


Duo Security, Inc.
FormerlyDuo Security LLC (2010–2018)
TypeSubsidiary
IndustryCybersecurity, Software
Founded2010
FoundersDug Song, Jon Oberheide
Headquarters
Ann Arbor, Michigan
,
United States
Area served
Worldwide
ParentCisco Systems
Websitewww.duo.com

Duo Security, Inc. (often shortened to Duo) is an American computer security company that develops cloud-based access security products, including multi-factor authentication (MFA) and device trust / device posture-based access controls. The company was founded in 2010 in Ann Arbor, Michigan by Dug Song and Jon Oberheide.

In 2018, Cisco announced plans to acquire Duo Security for $2.35 billion; the acquisition was completed on October 1, 2018.[1][2][3][4] After the acquisition, Duo’s business joined Cisco’s networking and security organization, with Song continuing as general manager.[5]

History

Duo Security was founded in 2010 by Dug Song and Jon Oberheide in Ann Arbor, Michigan.[6] In February 2012, Duo secured a $5 million funding round with contributions from Google Ventures, True Ventures, and Resonant Venture Partners.[7]

By 2016, Duo expanded beyond two-factor authentication (2FA), adding device-trust features and adaptive access policies within the emerging field of Zero Trust security. In February 2017, Duo released “Duo Beyond,” a commercial implementation of Google’s BeyondCorp security framework intended to extend its access security offerings beyond traditional two-factor authentication.[8]

In October 2017, Duo raised $70 million in a Series D funding round led by Meritech Capital Partners and Lead Edge Capital at a post-money valuation of approximately $1.17 billion, bringing the company’s total capital raised to about $119 million.[9]

In August 2018, Cisco announced its intent to acquire Duo Security for US $2.35 billion;[10] the acquisition closed on October 1, 2018, integrating Duo into Cisco’s Security Business Group as part of its broader Secure Access Service Edge (SASE) and Zero Trust strategy. [11] At the time of the Cisco transaction, TechCrunch reported Duo had about 700 employees and offices in the U.S. and London, while remaining headquartered in Ann Arbor.

In early 2021, Duo Security introduced infrastructure-agnostic passwordless authentication capabilities to enable users to log in without passwords using security keys or platform biometrics as part of its broader zero-trust security offerings.[12]

In October 2022, Dug Song, co-founder of Duo Security and then Cisco Security Chief Strategy Officer, left Cisco after four years with the company following its 2018 acquisition of Duo.[13]

In August 2023, Cisco’s Duo Security experienced a major authentication outage that lasted several hours and temporarily prevented some customers from accessing systems protected by Duo multi-factor authentication.[14]

In May 2025, Cisco expanded the Duo product line with the introduction of Duo Identity and Access Management (IAM), a broader identity and access management solution designed to address persistent identity-based security threats alongside existing authentication capabilities.[15]

See also

References

  1. ^ Burns, Matt (August 2, 2018). "Cisco is buying Duo Security for $2.35B in cash". TechCrunch. Retrieved February 27, 2026.
  2. ^ "Cisco to buy cybersecurity company Duo for $2.35B". Fox Business. Reuters. August 2, 2018. Retrieved February 27, 2026.
  3. ^ Hackett, Robert (August 2, 2018). "Cisco Buys Duo Security for $2.35 Billion". Fortune. Retrieved February 27, 2026.
  4. ^ "Cisco Completes Acquisition of Duo Security". Light Reading. October 1, 2018. Retrieved February 27, 2026.
  5. ^ "Cisco Completes Acquisition of Duo Security" (Press release). Cisco Newsroom. October 1, 2018. Retrieved February 27, 2026.
  6. ^ "Change or be changed: An interview with Duo Security co-founders". Michigan Engineering News. University of Michigan. April 16, 2019. Archived from the original on 5 December 2022. Retrieved October 30, 2025.
  7. ^ "Ann Arbor startup Duo Security lands $5 million from investment group including Google". The Ann Arbor News. February 28, 2012. Retrieved December 13, 2025.
  8. ^ "After more than doubling revenue, Duo Security looks 'Beyond' the firewall". TechCrunch. February 8, 2017. Retrieved December 13, 2025.
  9. ^ "Duo Security raises $70 million at a valuation north of $1 billion". TechCrunch. October 18, 2017. Retrieved December 13, 2025.
  10. ^ "Cisco is buying Duo Security for $2.35B in cash". TechCrunch. August 2, 2018. Retrieved October 30, 2025.
  11. ^ "Cisco Announces Completion of Acquisition of Duo Security" (Press release). Cisco Newsroom. October 1, 2018. Retrieved October 30, 2025.
  12. ^ "Cisco introduces infrastructure agnostic, passwordless authentication by Duo". Help Net Security. April 1, 2021. Retrieved December 13, 2025.
  13. ^ "Cisco Security Exec Exits". SDX Central. October 21, 2022. Retrieved December 13, 2025.
  14. ^ "Cisco's Duo Security suffers major authentication outage". The Register. August 21, 2023. Retrieved December 13, 2025.
  15. ^ "Cisco launches new identity access management products, services". SCWorld. May 28, 2025. Retrieved December 13, 2025.


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