# Turnstone Biologics funding: rounds and investors > Turnstone Biologics has raised $133M across 3 rounds since 2015. Investors include OrbiMed and Versant Ventures. Every round with its source. Source: https://millionrounds.com/company/turnstone-biologics (Millionrounds; every figure on the page links to its filing or article) United States · [Series D startup](https://millionrounds.com/companies) # Who invested in *Turnstone Biologics* 3 rounds we have observed, with the 2 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. Biotech Healthcare Funding summary Updated 26 Oct 2026 **$133M** raised across 3 rounds since 2015, from 3 sources **$11M** Series A **$41M** Series B **$80M** Series D - **Latest round:** Series D, $80M Jul 2021 - **Step-up i:** 1.9× - **Investors:** 2 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. 2016 2017 2018 2019 2020 2021 **$11M** Series A **$41M** Series B **$80M** Series D - **First round:** Series A, $11M - **Biggest round:** $80M - **Usual gap between rounds:** 4.7 years ## The rounds - **Jul 2021** Series D **$80M** *2 returning* [OrbiMed](https://millionrounds.com/fund/orbimed) [Versant Ventures](https://millionrounds.com/fund/versant-ventures) Source recorded SEC filing: $80M sold, first sale Jun 2021 - **Nov 2016** Series B **$41M** *1 new* [OrbiMed](https://millionrounds.com/fund/orbimed) Reported by FinSMEs - **Oct 2015** Series A **$11M** *1 new* [Versant Ventures](https://millionrounds.com/fund/versant-ventures) From a historical funding record ## 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. **Series A** 2015 **Series B** 2016 **Series D** 2021 [OrbiMed](https://millionrounds.com/fund/orbimed) [Versant Ventures](https://millionrounds.com/fund/versant-ventures) ## Everyone who backed them [OrbiMed](https://millionrounds.com/fund/orbimed) Private equity **2** rounds [Versant Ventures](https://millionrounds.com/fund/versant-ventures) VC firm **2** rounds Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=turnstone-biologics). ## Also claim to have backed them This firm lists Turnstone Biologics 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. [Brace Pharma](https://millionrounds.com/fund/brace-pharma-capital) VC firm Per its own site ## Quick answers about Turnstone Biologics ### Who invested in Turnstone Biologics? Turnstone Biologics's investors include OrbiMed and Versant Ventures. ### How much has Turnstone Biologics raised? Turnstone Biologics has raised $133M across 3 rounds since 2015. ### When did Turnstone Biologics last raise? Turnstone Biologics's most recent round was a Series D of $80M in Jul 2021. ### What was Turnstone Biologics's biggest round? Its most recent round, $80M in Jul 2021, is also its largest on record. ### Who backed Turnstone Biologics first? Turnstone Biologics's first round on record, in Oct 2015, was backed by Versant Ventures. ### What stage is Turnstone Biologics at? Turnstone Biologics's latest named round is a Series D, in Jul 2021. ### Where is Turnstone Biologics based? Turnstone Biologics is based in the United States. ## Companies like Turnstone Biologics In the same sector, and raised in the last eighteen months. [**Star Therapeutics** $325M · Oct 2026](https://millionrounds.com/company/star-therapeutics)[**Promaxo** $106M · Oct 2026](https://millionrounds.com/company/promaxo)[**Prolific Machines** $105M · Oct 2026](https://millionrounds.com/company/prolific-machines)[**AI** $18M · Oct 2026](https://millionrounds.com/company/ai)[**Baba** $40M · Oct 2026](https://millionrounds.com/company/baba)[**IMIO** $19M · Oct 2026](https://millionrounds.com/company/imio) ## 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