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The Venture Codex

Addition

43 W 23rd Street, New York, NY, 10010, United States

Overview

Addition is a venture capital firm that invests in early and growth-stage tech companies. The firm was founded in 2020 by Lee Fixel with a mission to support visionary entrepreneurs on their journey to build impactful and enduring businesses.

Total investments
131
Lead investments
72
Investments · 12mo
17
Active investors
9

Sector focus

  • Business Development
  • Financial Services
  • Venture Capital
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Investment portfolio

  • Lumilens

    Participated · Series C · Aug 2026

    Lumilens develops photonic connectivity solutions intended to connect thousands or hundreds of thousands of GPUs so they can operate as a single system, addressing the limits of copper-based scale-out networks. The team moved from founding to defining, qualifying and shipping its first product within about two years, and that product is deployed in a hyperscaler’s production AI data centers under a multi-billion-dollar agreement. Lumilens emerged from stealth concurrent with its announced raise of more than $900 million from a syndicate of venture and institutional investors. Management says the funding will support building out infrastructure and developing additional products on its roadmap. The company positions itself at the intersection of optics and AI infrastructure to overcome physical constraints on GPU-scale networking.

  • Airwallex

    Led · Series H · Jun 2026

    Airwallex offers an AI-native financial operating system and a suite of regulated financial infrastructure products, including payment acceptance, billing, global accounts, corporate cards, and spend management. The company holds 85+ licenses across North America, Europe, the Middle East, and Asia-Pacific and serves more than 676,000 businesses worldwide, directly or through platform partners. Airwallex reported $1.3 billion in annualized revenue and $287 billion in annualized transaction volume as of March 2026, with more than 90% of revenue coming from customers using multiple products. It is rolling out two new initiatives—T:0, an end-to-end AI-native finance platform currently in private beta, and Airi, a consumer wallet and agentic commerce infrastructure. The company plans to use recent funding to accelerate product development, expand its regulatory and infrastructure footprint, and scale teams to build next-generation AI-native financial software. Airwallex was founded in Melbourne in 2015 and is co-headquartered in San Francisco and Singapore, with over 2,300 employees across 27 offices.

  • Chapter

    Participated · Series E · Apr 2026

    Chapter offers an AI-native platform that powers licensed advisors to deliver personalized, impartial Medicare plan recommendations and help seniors maximize benefits. The company reviews every Medicare plan nationwide and has deployed products such as the most accurate provider directory and a prescription cost calculator for Medicare. Chapter reported rapid commercial traction in 2025, growing revenue threefold and surpassing $100 million in annual recurring revenue while maintaining flat corporate headcount. It is expanding its product set to launch additional financial products and to help members save across more of their spending. The business positions itself as the leading Medicare navigation option nationwide and partners with organizations to assist seniors with retirement healthcare decisions.

  • Stedi

    Led · Series C · Mar 2026

    Stedi builds an API-first, cloud-native healthcare clearinghouse that handles essential transactions between providers and payers, including eligibility checks, claims and electronic payments. The company is led by founder and CEO Zack Kanter and is based in Denver. Stedi has reported rapid commercial growth, increasing its paying customer base 6x and transaction volume 7x year-over-year and now processes over one billion transactions annually. The company has raised a total of $142M to date. Following the Series C, Stedi plans to use new capital to expand its product presence and scale its infrastructure.

  • Frore Systems

    Participated · Series D · Mar 2026

    Frore Systems develops liquid-cooling systems for semiconductor chips and boards and was founded by two former Qualcomm engineers. The company began by creating air-cooling technology for phones and other small fanless electronics before pivoting toward liquid cooling for high-performance chips. That shift was inspired after a demonstration to Nvidia CEO Jensen Huang about two years ago, and Frore has since released products compatible with various Nvidia chips and boards. Frore has also developed cooling products for Qualcomm and AMD. Financially, the company has raised $340 million in total and completed a $143 million Series D that values it at $1.64 billion. The company is described as eight years old in the reporting.

Team