# Alector funding: rounds and investors > Alector has raised $215M across 4 rounds since 2013. Investors include Polaris Partners, Google Ventures and OrbiMed. Every round with its source. Source: https://millionrounds.com/company/alector (Millionrounds; every figure on the page links to its filing or article) United States · [Funded startup](https://millionrounds.com/companies) # Who invested in *Alector* 4 rounds we have observed, with the 11 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 **$215M** raised across 4 rounds since 2013, from 4 sources **$32M** Series C **$133M** Series E **$50M** Debt - **Latest round:** Debt, $50M Nov 2024 - **Biggest round:** $133M Series E · Jul 2018 - **Investors:** 11 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. 2015 2017 2019 2021 2023 **?** Series A **$32M** Series C **$133M** Series E **$50M** Debt - **First round:** Series A - **Biggest round:** $133M - **Usual gap between rounds:** 2.8 years ## The rounds - **Nov 2024** Debt **$50M** *5 new* *1 returning* [Polaris Partners](https://millionrounds.com/fund/polaris-partners) [Perceptive Advisors](https://millionrounds.com/fund/perceptive-advisors) [Foresite Capital](https://millionrounds.com/fund/forsite-capital) [Lilly Asia Ventures](https://millionrounds.com/fund/lilly-asia-ventures) [S32](https://millionrounds.com/fund/s32) [AbbVie](https://millionrounds.com/fund/abbvie) Source recorded - **Jul 2018** Series E **$133M** *1 returning* [Google Ventures](https://millionrounds.com/fund/gv) Reported by Xconomy - **Sept 2015** Series C **$32M** *4 new* *2 returning* [Google Ventures](https://millionrounds.com/fund/gv) [Polaris Partners](https://millionrounds.com/fund/polaris-partners) [OrbiMed](https://millionrounds.com/fund/orbimed) [Topspin Partners](https://millionrounds.com/fund/topspin-partners) [Mission Bay Capital](https://millionrounds.com/fund/mission-bay-capital) [MRL Ventures](https://millionrounds.com/fund/mrl-ventures) From a historical funding record SEC filing: $32M sold, first sale Sept 2015 - **Oct 2013** Series A **Amount undisclosed** *2 new* [Polaris Partners](https://millionrounds.com/fund/polaris-partners) [OrbiMed](https://millionrounds.com/fund/orbimed) Reported by businesswire.com ## Founders and team From the SEC filings it signed: 1 on the team. - **Arnon Rosenthal** President, Chief Executive Officer and Director of Issuer i On the board, as filed i *Carl Gordon* *Terry McGuire* *Tillman Gerngross* ## 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** 2013 **Series C** 2015 **Series E** 2018 **Debt** 2024 [Polaris Partners](https://millionrounds.com/fund/polaris-partners) [Google Ventures](https://millionrounds.com/fund/gv) [OrbiMed](https://millionrounds.com/fund/orbimed) [Perceptive Advisors](https://millionrounds.com/fund/perceptive-advisors) [Foresite Capital](https://millionrounds.com/fund/forsite-capital) [Lilly Asia Ventures](https://millionrounds.com/fund/lilly-asia-ventures) [S32](https://millionrounds.com/fund/s32) [AbbVie](https://millionrounds.com/fund/abbvie) [Topspin Partners](https://millionrounds.com/fund/topspin-partners) [Mission Bay Capital](https://millionrounds.com/fund/mission-bay-capital) ## Everyone who backed them [Polaris Partners](https://millionrounds.com/fund/polaris-partners) VC firm **3** rounds [Google Ventures](https://millionrounds.com/fund/gv) Corporate VC **2** rounds [OrbiMed](https://millionrounds.com/fund/orbimed) Private equity **2** rounds [Perceptive Advisors](https://millionrounds.com/fund/perceptive-advisors) Asset manager **1** round [Foresite Capital](https://millionrounds.com/fund/forsite-capital) Private equity **1** round [Lilly Asia Ventures](https://millionrounds.com/fund/lilly-asia-ventures) VC firm **1** round [S32](https://millionrounds.com/fund/s32) VC firm **1** round [AbbVie](https://millionrounds.com/fund/abbvie) Corporate VC **1** round [Topspin Partners](https://millionrounds.com/fund/topspin-partners) VC firm **1** round [Mission Bay Capital](https://millionrounds.com/fund/mission-bay-capital) VC firm **1** round [MRL Ventures](https://millionrounds.com/fund/mrl-ventures) VC firm **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=alector). ## Also claim to have backed them This firm lists Alector 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. [Mission BioCapital](https://millionrounds.com/fund/mission-biocapital) VC firm Per its own site ## Quick answers about Alector ### Who invested in Alector? Alector's investors include Polaris Partners, Google Ventures, OrbiMed, Perceptive Advisors and Foresite Capital, and 6 more on record. ### How much has Alector raised? Alector has raised $215M across 4 rounds since 2013. One round did not disclose an amount, so the total is a floor. ### When did Alector last raise? Alector's most recent round was a Debt of $50M in Nov 2024. ### What was Alector's biggest round? Alector's largest round on record is $133M (Series E), in Jul 2018. ### Who backed Alector first? Alector's first round on record, in Oct 2013, was backed by Polaris Partners and OrbiMed. ### What stage is Alector at? Alector's latest named round is a Debt, in Nov 2024. ### Where is Alector based? Alector is based in the United States. ## Companies like Alector 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