# Threat Stack funding: rounds and investors > Threat Stack has raised $57M across 5 rounds since 2013. Investors include 406 Ventures, Atlas Venture and Techstars. Every round with its source. Source: https://millionrounds.com/company/threat-stack (Millionrounds; every figure on the page links to its filing or article) United States · [Series C startup](https://millionrounds.com/companies) # Who invested in *Threat Stack* 5 rounds we have observed, with the 5 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 **$57M** raised across 5 rounds since 2013, from 5 sources **$118K** Seed **$1.2M** Seed **$2.7M** Series A **$7.9M** Series A **$45M** Series C - **Latest round:** Series C, $45M Sept 2017 - **Step-up i:** 5.7× - **Investors:** 5 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. 2013 2014 2015 2016 2017 **$118K** Seed **$1.2M** Seed **$2.7M** Series A **$7.9M** Series A **$45M** Series C - **First round:** Seed, $118K - **Biggest round:** $45M - **Usual gap between rounds:** 16 months ## The rounds - **Sept 2017** Series C **$45M** *2 new* *2 returning* [Techstars](https://millionrounds.com/fund/techstars) [Right Side Capital Management](https://millionrounds.com/fund/right-side-capital-management) [Eight Roads Ventures](https://millionrounds.com/fund/eight-roads) [406 Ventures](https://millionrounds.com/fund/406-ventures) Source recorded SEC filing: $33M sold, first sale Sept 2017 - **Aug 2015** Series A **$7.9M** *2 returning* [Atlas Venture](https://millionrounds.com/fund/atlas-venture) [406 Ventures](https://millionrounds.com/fund/406-ventures) From a historical funding record SEC filing: $7.9M sold, first sale Nov 2014 - **Apr 2014** Series A **$2.7M** *2 returning* [Atlas Venture](https://millionrounds.com/fund/atlas-venture) [406 Ventures](https://millionrounds.com/fund/406-ventures) From a historical funding record SEC filing: $2.7M sold, first sale Apr 2014 - **Oct 2013** Seed **$1.2M** *2 new* [Atlas Venture](https://millionrounds.com/fund/atlas-venture) [406 Ventures](https://millionrounds.com/fund/406-ventures) Reported by bostinno.streetwise.co SEC filing: $1.3M sold, first sale Aug 2013 - **Jan 2013** Seed **$118K** *1 new* [Techstars](https://millionrounds.com/fund/techstars) Reported by rackspace.com ## 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** 2013 **Seed** 2013 **Series A** 2014 **Series A** 2015 **Series C** 2017 [406 Ventures](https://millionrounds.com/fund/406-ventures) [Atlas Venture](https://millionrounds.com/fund/atlas-venture) [Techstars](https://millionrounds.com/fund/techstars) [Right Side Capital Management](https://millionrounds.com/fund/right-side-capital-management) [Eight Roads Ventures](https://millionrounds.com/fund/eight-roads) ## Everyone who backed them [406 Ventures](https://millionrounds.com/fund/406-ventures) VC firm **4** rounds [Atlas Venture](https://millionrounds.com/fund/atlas-venture) VC firm **3** rounds [Techstars](https://millionrounds.com/fund/techstars) VC firm **2** rounds [Right Side Capital Management](https://millionrounds.com/fund/right-side-capital-management) VC firm **1** round [Eight Roads Ventures](https://millionrounds.com/fund/eight-roads) VC firm **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=threat-stack). ## Also claim to have backed them This firm lists Threat Stack 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. [fama Ventures, LLC](https://millionrounds.com/fund/fama-ventures) VC firm Per its own site ## Quick answers about Threat Stack ### Who invested in Threat Stack? Threat Stack's investors include 406 Ventures, Atlas Venture, Techstars, Right Side Capital Management and Eight Roads Ventures. ### How much has Threat Stack raised? Threat Stack has raised $57M across 5 rounds since 2013. ### When did Threat Stack last raise? Threat Stack's most recent round was a Series C of $45M in Sept 2017. ### What was Threat Stack's biggest round? Its most recent round, $45M in Sept 2017, is also its largest on record. ### Who backed Threat Stack first? Threat Stack's first round on record, in Jan 2013, was backed by Techstars. ### What stage is Threat Stack at? Threat Stack's latest named round is a Series C, in Sept 2017. ### Where is Threat Stack based? Threat Stack is based in the United States. ## Companies like Threat Stack 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. Open the investor searchOr these rounds in the app