# Mersana Therapeutics funding: rounds and investors > Mersana Therapeutics has raised $148M across 8 rounds since 2005. Investors include New Enterprise Associates, F-Prime Capital and Fidelity Biosciences. Source: https://millionrounds.com/company/mersana-therapeutics (Millionrounds; every figure on the page links to its filing or article) United States · [Series C startup](https://millionrounds.com/companies) # Who invested in *Mersana Therapeutics* 8 rounds we have observed, with the 13 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 **$148M** raised across 8 rounds since 2005, from 8 sources **$21M** Venture **$2.5M** Debt **$10M** Debt **$27M** Series A **$5.0M** Series A **$15M** Series A **$35M** Series B **$33M** Series C - **Latest round:** Series C, $33M Jun 2016 - **Biggest round:** $35M Series B · Mar 2015 - **Investors:** 13 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. 2007 2009 2011 2013 2015 **$21M** Venture **$2.5M** Debt **$10M** Debt **$27M** Series A **$5.0M** Series A **$15M** Series A **$35M** Series B **$33M** Series C - **First round:** Venture, $21M - **Biggest round:** $35M - **Usual gap between rounds:** 14 months ## The rounds - **Jun 2016** Series C **$33M** *1 new* [Wellington Management](https://millionrounds.com/fund/wellington-management) Reported by Fiercebiotech SEC filing: $33M sold, first sale Jun 2016 - **Mar 2015** Series B **$35M** *2 new* *3 returning* [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) [F-Prime Capital](https://millionrounds.com/fund/f-prime) [Pfizer](https://millionrounds.com/fund/pfizer) [Rock Springs Capital](https://millionrounds.com/fund/rock-springs-capital) Elliott Sigal From a historical funding record SEC filing: $10M sold, first sale Feb 2015 - **Apr 2014** Series A **$15M** *3 returning* [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) [F-Prime Capital](https://millionrounds.com/fund/f-prime) [Fidelity Biosciences](https://millionrounds.com/fund/fidelity-biosciences) From a historical funding record SEC filing: $15M sold, first sale Sept 2013 - **Oct 2013** Series A **$5.0M** *2 returning* [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) [Fidelity Biosciences](https://millionrounds.com/fund/fidelity-biosciences) Reported by boston.citybizlist.com SEC filing: $5.0M sold, first sale Sept 2013 - **Jul 2012** Series A **$27M** *2 new* *3 returning* [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) [F-Prime Capital](https://millionrounds.com/fund/f-prime) [Pfizer](https://millionrounds.com/fund/pfizer) [Fidelity Biosciences](https://millionrounds.com/fund/fidelity-biosciences) [ProQuest Investments](https://millionrounds.com/fund/proquest-investments) Reported by finsmes.com SEC filing: $13M sold, first sale Jul 2012 - **Apr 2012** Debt **$10M** No investor was named in the report. Reported by sec.gov SEC filing: $10M sold, first sale Apr 2011 - **Feb 2010** Debt **$2.5M** No investor was named in the report. From a historical funding record SEC filing: $2.5M sold, first sale Jan 2010 - **Nov 2005** Venture **$21M** *8 new* [F-Prime Capital](https://millionrounds.com/fund/f-prime) [Rho Capital Partners](https://millionrounds.com/fund/rho-capital-partners) [Harris & Harris Group](https://millionrounds.com/fund/harris-and-harris-group) [Fidelity Biosciences](https://millionrounds.com/fund/fidelity-biosciences) [ProQuest Investments](https://millionrounds.com/fund/proquest-investments) [PureTech Health](https://millionrounds.com/fund/puretech-health) [Lansing Brown Investments](https://millionrounds.com/fund/lansing-brown-investments) Cape Family Fund Reported by mersana.com ## Founders and team From the SEC filings it signed: 6 on the team. - **Anna Protopapas** Executive Officer, Director i - **Donald Bergstrom** Executive Officer i - **Eva Jack** Executive Officer i - **Michael J. Kaufman** Executive Officer i - **Timothy Lowinger** Executive Officer i - **Wayne J. Foster** Executive Officer i On the board, as filed i *David Mott* *Elaine J. Jones* *Sara J. Nayeem* *Thomas J. Beck* ## 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. **Venture** 2005 **Debt** 2010 **Debt** 2012 **Series A** 2012 **Series A** 2013 **Series A** 2014 **Series B** 2015 **Series C** 2016 [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) [F-Prime Capital](https://millionrounds.com/fund/f-prime) [Fidelity Biosciences](https://millionrounds.com/fund/fidelity-biosciences) [Pfizer](https://millionrounds.com/fund/pfizer) [ProQuest Investments](https://millionrounds.com/fund/proquest-investments) [Wellington Management](https://millionrounds.com/fund/wellington-management) [Rho Capital Partners](https://millionrounds.com/fund/rho-capital-partners) [Harris & Harris Group](https://millionrounds.com/fund/harris-and-harris-group) [Rock Springs Capital](https://millionrounds.com/fund/rock-springs-capital) [PureTech Health](https://millionrounds.com/fund/puretech-health) ## Everyone who backed them [New Enterprise Associates](https://millionrounds.com/fund/new-enterprise-associates) VC firm **4** rounds [F-Prime Capital](https://millionrounds.com/fund/f-prime) VC firm **4** rounds [Fidelity Biosciences](https://millionrounds.com/fund/fidelity-biosciences) Investment firm **4** rounds [Pfizer](https://millionrounds.com/fund/pfizer) Corporate VC **2** rounds [ProQuest Investments](https://millionrounds.com/fund/proquest-investments) VC firm **2** rounds [Wellington Management](https://millionrounds.com/fund/wellington-management) VC firm **1** round [Rho Capital Partners](https://millionrounds.com/fund/rho-capital-partners) Private equity **1** round [Harris & Harris Group](https://millionrounds.com/fund/harris-and-harris-group) Growth equity **1** round [Rock Springs Capital](https://millionrounds.com/fund/rock-springs-capital) Hedge fund **1** round [PureTech Health](https://millionrounds.com/fund/puretech-health) VC firm **1** round [Lansing Brown Investments](https://millionrounds.com/fund/lansing-brown-investments) VC firm **1** round Cape Family Fund no record of our own yet **1** round Elliott Sigal 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=mersana-therapeutics). ## Also claim to have backed them These 2 firms list Mersana Therapeutics as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above. [Lightstone Ventures](https://millionrounds.com/fund/lightstone-ventures) VC firm Per its own site [Nextech Invest](https://millionrounds.com/fund/nextech-invest) Private equity Per its own site ## Quick answers about Mersana Therapeutics ### Who invested in Mersana Therapeutics? Mersana Therapeutics's investors include New Enterprise Associates, F-Prime Capital, Fidelity Biosciences, Pfizer and ProQuest Investments, and 8 more on record. ### How much has Mersana Therapeutics raised? Mersana Therapeutics has raised $148M across 8 rounds since 2005. ### When did Mersana Therapeutics last raise? Mersana Therapeutics's most recent round was a Series C of $33M in Jun 2016. ### What was Mersana Therapeutics's biggest round? Mersana Therapeutics's largest round on record is $35M (Series B), in Mar 2015. ### Who backed Mersana Therapeutics first? Mersana Therapeutics's first round on record, in Nov 2005, was backed by F-Prime Capital, Rho Capital Partners and Harris & Harris Group and 5 others. ### What stage is Mersana Therapeutics at? Mersana Therapeutics's latest named round is a Series C, in Jun 2016. ### Where is Mersana Therapeutics based? Mersana Therapeutics is based in the United States. ## Companies like Mersana Therapeutics In the same sector, and raised in the last eighteen months. 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