Index Ventures

Index Ventures is a venture capital firm headquartered in London with offices in San Francisco and Geneva, focused on backing technology-driven startups across Europe, North America, and beyond. The firm specializes in high technology and life sciences, and invests across early and growth stages in sectors such as artificial intelligence, software, data, fintech, healthcare, media, mobility, open source, and security. Since its founding in 1996, Index Ventures has partnered with ambitious entrepreneurs to turn bold ideas into global businesses, providing strategic guidance and capital to help companies scale. Notable portfolio companies include Adyen, Deliveroo, Dropbox, Farfetch, King, Slack, and Supercell, reflecting the firm’s track record of supporting market-changing technology companies.

Nina Achadjian

Partner

Chris Ahn

Principal

Julia Andre

Partner and Investor

Damir Becirovic

Partner

Bernard Dalle

Partner

Sofia Dolfe

Partner and Investor

Zabie Elmgren

Partner

Mark Fiorentino

Principal

Paula Garcia Domingo

Partner and Investor

Giacomo Genzini

Partner and Investor

Mark Goldberg

Partner

Carlos Gonzalez-Cadenas

Partner and Investor

Jan Hammer

General Partner

Paris Heymann

Partner and Investor

Jacob Jofe

Associate

Jack Kleeman

Partner

Adrianna Ma

Investor

Martin Mignot

Partner

Bryan Offut

Principal / Partner

Bryan Offutt

Principal

Shimin Ooi

Partner

Cyriac Parisot

VC Investor and Head of Data

Danny Rimer

Partner

Neil Rimer

General Partner

Jahanvi Sardana

Partner and Investor

Hannah Seal

Partner and Investor

Shardul Shah

Partner

Kimihiko Shindo

General Partner

Georgia Stevenson

Partner and Investor

Ishani Thakur

Partner and investor

Kelly Toole

Principal

Dominique Vidal

Venture Partner

Katharina Wilhelm

Partner and Investor

Catherine Wu

Partner and Investor

Cat Wu

Partner

Giuseppe Zocco

Co-Founder

Past deals in Fraud Detection

Persona

Series D in 2025
Persona specializes in identity verification solutions for businesses. It offers an automated suite of tools to verify customer identities globally, enhancing trust and security online while preventing fraud.

Upollo

Pre Seed Round in 2022
Upollo enhances subscription business growth by predicting customer behavior such as churn, conversion, and expansion. It analyzes vast amounts of data to provide actionable insights for customer success, sales, and marketing teams.

Vesta

Series A in 2022
Vesta Corporation is a provider of electronic payment solutions, specializing in client-branded services that enhance payment processing for merchants. The company offers a range of merchant solutions, including vSafe for Small to Midsize Businesses, which focuses on payment and fraud protection for smaller digital goods merchants, and vSafe for Enterprise, designed for comprehensive payments management and enterprise-level fraud prevention. Additionally, Vesta provides vGuaranteed, a payment solution tailored for online retailers, and DelayPay, a retail installment program that allows prepaid wireless customers to pay for services in installments. Founded in 1995 and headquartered in Lake Oswego, Oregon, Vesta operates globally, with centers in the United States, Ireland, China, and an office in Singapore. The company serves diverse industries, including e-commerce, telecommunications, and financial services, processing hundreds of millions of secure payments across various channels while prioritizing data security and fraud loss elimination.

Resistant AI

Series A in 2021
Resistant AI is a technology company that provides risk management software for machine learning systems and digital financial services. Its offerings focus on protecting automated financial platforms from adversarial manipulation and fraud, including document fraud detection and transaction monitoring. The company helps banks, insurance companies, payment platforms, and lenders secure digital transactions and perform identity forensics to guard against manipulation by organized fraudsters. By combining ML risk detection with ongoing monitoring, Resistant AI aims to enable responsible deployment of AI and machine learning while identifying, managing, and resolving risks associated with AI adoption and automated finance.

Persona

Series C in 2021
Persona specializes in identity verification solutions for businesses. It offers an automated suite of tools to verify customer identities globally, enhancing trust and security online while preventing fraud.

Persona

Series B in 2021
Persona specializes in identity verification solutions for businesses. It offers an automated suite of tools to verify customer identities globally, enhancing trust and security online while preventing fraud.

Resistant AI

Seed Round in 2020
Resistant AI is a technology company that provides risk management software for machine learning systems and digital financial services. Its offerings focus on protecting automated financial platforms from adversarial manipulation and fraud, including document fraud detection and transaction monitoring. The company helps banks, insurance companies, payment platforms, and lenders secure digital transactions and perform identity forensics to guard against manipulation by organized fraudsters. By combining ML risk detection with ongoing monitoring, Resistant AI aims to enable responsible deployment of AI and machine learning while identifying, managing, and resolving risks associated with AI adoption and automated finance.

Castle

Series A in 2019
Castle is a technology company that specializes in online fraud prevention. It offers an API-based solution that enables businesses of all sizes to detect and mitigate user account fraud, a capability previously accessible only to large financial institutions. Castle's platform tracks and analyzes user behavior in real-time, using a wide range of signals such as device fingerprints, keystroke dynamics, and browsing history. When suspicious activity is detected, both the business administrator and the affected user are alerted, allowing for swift and appropriate action. This service is designed to protect a broad spectrum of online businesses, including e-commerce platforms, mobile applications, and cryptocurrency services.
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