United States · 
Who invested in Alector?
Alector's investors include Polaris Partners, Google Ventures, OrbiMed, Perceptive Advisors and Foresite Capital, and 6 more on record.
20152017201920212023
?Series A$32MSeries C$133MSeries E$50MDebt
United States · Funded startup
Who invested in Alector
Funding summaryUpdated 26 Oct 2026
$215Mraised across 4 rounds since 2013, from 4 sources
$32MSeries C$133MSeries E$50MDebt
- Latest round
- Debt, $50MNov 2024
- Biggest round
- $133MSeries E · Jul 2018
- Investors
- 11
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Series A Oct 2013
- Biggest round
- $133M Series E · Jul 2018
- Usual gap between rounds
- 2.8 years the median of 3
The rounds
- Nov 2024Debt$50M5 new1 returning
Source recorded
- Jul 2018
- Sept 2015Series C$32M4 new2 returning
From a historical funding recordSEC filing: $32M sold, first sale Sept 2015
- Oct 2013
Founders and team
From the SEC filings it signed: 1 on the team.
- Arnon RosenthalPresident, Chief Executive Officer and Director of Issueri
On the board, as filediCarl GordonTerry McGuireTillman 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 A2013Series C2015Series E2018Debt2024
Polaris Partners
Google Ventures
OrbiMed
Perceptive Advisors
Foresite CapitalLilly Asia Ventures
S32
AbbVie
Topspin Partners
Mission Bay Capital
Polaris PartnersGoogle VenturesOrbiMedPerceptive AdvisorsForesite CapitalLilly Asia VenturesS32AbbVieTopspin PartnersMission Bay CapitalEveryone who backed them
Lilly Asia VenturesVC firm1round
MRL VenturesVC firm1round
Missing a round, or an investor who was in one? Tell us.
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.
Quick answers about Alector
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.
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