# Duo Security funding: rounds and investors > Duo Security has raised $120M across 7 rounds since 2010. Investors include Google Ventures, Radar Partners and Redpoint. Every round with its source. Source: https://millionrounds.com/company/duo-security (Millionrounds; every figure on the page links to its filing or article) United States · [Venture startup](https://millionrounds.com/companies) # Who invested in *Duo Security* 7 rounds we have observed, with the 12 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it. Cybersecurity Funding summary Updated 26 Oct 2026 **$120M** raised across 7 rounds since 2010, from 7 sources **$1.0M** Seed **$6.0M** Series A **$1000K** Series A **$12M** Series B **$30M** Series C **$70M** Series D - **Latest round:** Venture Jan 2020 - **Biggest round:** $70M Series D · Oct 2017 - **Investors:** 12 See who backed them ## The funding story Each circle is a round, placed by date and sized by amount. The line above is the running total. 2010 2012 2014 2016 2018 2020 **$1.0M** Seed **$6.0M** Series A **$1000K** Series A **$12M** Series B **$30M** Series C **$70M** Series D **?** Venture - **First round:** Seed, $1.0M - **Biggest round:** $70M - **Usual gap between rounds:** 2.1 years ## The rounds - **Jan 2020** Venture **Amount undisclosed** *5 returning* [Index Ventures](https://millionrounds.com/fund/index-ventures) [Google Ventures](https://millionrounds.com/fund/gv) [Redpoint](https://millionrounds.com/fund/redpoint) [Benchmark](https://millionrounds.com/fund/benchmark) [Geodesic Capital](https://millionrounds.com/fund/geodesic-capital) Source recorded - **Oct 2017** Series D **$70M** *5 new* *1 returning* [Index Ventures](https://millionrounds.com/fund/index-ventures) [Redpoint](https://millionrounds.com/fund/redpoint) [Meritech Capital Partners](https://millionrounds.com/fund/meritech-capital-partners) [Geodesic Capital](https://millionrounds.com/fund/geodesic-capital) [True.](https://millionrounds.com/fund/true) Lead Edge Capital/ Workday Reported by FinSMEs - **Apr 2015** Series C **$30M** *1 new* *4 returning* [Google Ventures](https://millionrounds.com/fund/gv) [Redpoint](https://millionrounds.com/fund/redpoint) [Benchmark](https://millionrounds.com/fund/benchmark) [True Ventures](https://millionrounds.com/fund/true-ventures-2) [Radar Partners](https://millionrounds.com/fund/radar-partners) From a historical funding record - **Sept 2014** Series B **$12M** *1 new* *3 returning* [Google Ventures](https://millionrounds.com/fund/gv) [Benchmark](https://millionrounds.com/fund/benchmark) [True Ventures](https://millionrounds.com/fund/true-ventures-2) [Radar Partners](https://millionrounds.com/fund/radar-partners) From a historical funding record - **Aug 2012** Series A **$1000K** *1 returning* [Radar Partners](https://millionrounds.com/fund/radar-partners) Reported by sec.gov SEC filing: $1000K sold, first sale Aug 2012 - **Feb 2012** Series A **$6.0M** *3 new* *1 returning* [Google Ventures](https://millionrounds.com/fund/gv) [True Ventures](https://millionrounds.com/fund/true-ventures-2) [Radar Partners](https://millionrounds.com/fund/radar-partners) [Resonant Venture Partners](https://millionrounds.com/fund/resonant-venture-partners) Reported by techcrunch.com SEC filing: $5.0M sold, first sale Feb 2012 - **Aug 2010** Seed **$1.0M** *2 new* [True Ventures](https://millionrounds.com/fund/true-ventures) [Resonant Venture Partners](https://millionrounds.com/fund/resonant-venture-partners) Reported by trueventures.com ## Founders and team From the SEC filings it signed: 1 on the team. - **Douglas Joon Song** Executive Officer, Director i ## Who was in which round The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led. **Seed** 2010 **Series A** 2012 **Series A** 2012 **Series B** 2014 **Series C** 2015 **Series D** 2017 **Venture** 2020 [Google Ventures](https://millionrounds.com/fund/gv) [Radar Partners](https://millionrounds.com/fund/radar-partners) [Redpoint](https://millionrounds.com/fund/redpoint) [Benchmark](https://millionrounds.com/fund/benchmark) [True Ventures](https://millionrounds.com/fund/true-ventures-2) [Index Ventures](https://millionrounds.com/fund/index-ventures) [Geodesic Capital](https://millionrounds.com/fund/geodesic-capital) [Resonant Venture Partners](https://millionrounds.com/fund/resonant-venture-partners) [True Ventures](https://millionrounds.com/fund/true-ventures) [Meritech Capital Partners](https://millionrounds.com/fund/meritech-capital-partners) ## Everyone who backed them [Google Ventures](https://millionrounds.com/fund/gv) Corporate VC **4** rounds [Radar Partners](https://millionrounds.com/fund/radar-partners) VC firm **4** rounds [Redpoint](https://millionrounds.com/fund/redpoint) VC firm **3** rounds [Benchmark](https://millionrounds.com/fund/benchmark) VC firm **3** rounds [True Ventures](https://millionrounds.com/fund/true-ventures-2) VC firm **3** rounds [Index Ventures](https://millionrounds.com/fund/index-ventures) VC firm **2** rounds [Geodesic Capital](https://millionrounds.com/fund/geodesic-capital) VC firm **2** rounds [Resonant Venture Partners](https://millionrounds.com/fund/resonant-venture-partners) VC firm **2** rounds [True Ventures](https://millionrounds.com/fund/true-ventures) VC firm **1** round [Meritech Capital Partners](https://millionrounds.com/fund/meritech-capital-partners) VC firm **1** round [True.](https://millionrounds.com/fund/true) VC firm **1** round Lead Edge Capital/ Workday no record of our own yet **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=duo-security). ## Also claim to have backed them This firm lists Duo Security as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above. [Sourcefire](https://millionrounds.com/fund/sourcefire) Growth equity Per its own site ## Quick answers about Duo Security ### Who invested in Duo Security? Duo Security's investors include Google Ventures, Radar Partners, Redpoint, Benchmark and True Ventures, and 7 more on record. ### How much has Duo Security raised? Duo Security has raised $120M across 7 rounds since 2010. One round did not disclose an amount, so the total is a floor. ### When did Duo Security last raise? Duo Security's most recent round was a Venture in Jan 2020. ### What was Duo Security's biggest round? Duo Security's largest round on record is $70M (Series D), in Oct 2017. ### Who backed Duo Security first? Duo Security's first round on record, in Aug 2010, was backed by True Ventures and Resonant Venture Partners. ### What stage is Duo Security at? Duo Security's latest named round is a Venture, in Jan 2020. ### Where is Duo Security based? Duo Security is based in the United States. ## Companies like Duo Security In the same sector, and raised in the last eighteen months. [**FORT Robotics** $39M · Oct 2026](https://millionrounds.com/company/fort-robotics)[**Opsin** $21M · Oct 2026](https://millionrounds.com/company/opsin)[**Harmonic Security** $68M · Oct 2026](https://millionrounds.com/company/harmonic-security)[**Reach Security** $60M · Oct 2026](https://millionrounds.com/company/reach-security)[**Persona** $210M · Oct 2026](https://millionrounds.com/company/persona)[**Hilt** $4.7M · Oct 2026](https://millionrounds.com/company/hilt) ## Find investors like these Search every investor by what they have actually funded, then narrow to your stage and market. Free. 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