Addition

New York multi-stage firm founded by Lee Fixel (ex-Tiger Global), managing ~$6.3B+ and writing concentrated seed-to-growth checks into founder-led category leaders across enterprise, fintech, and AI infrastructure.

Typical check size

$1M-$10M (stage-based estimate)

Founded

2019

Headquarters

New York, NY

AUM

$6.3B+

Rounds they lead

Series A Series B+

Rounds they invest

Seed Series A Series B+

Portfolio companies we track

Startups in our directory that list Addition as an investor (6 total).

Alchemy Blockchain developer platform (node/API infrastructure) for web3 builders.
Anyscale Commercial platform for Ray distributed computing — scale AI/ML workloads on any cloud.
Applied Intuition Simulation and validation software for autonomous vehicles, defense, and robotics.
Base Power U.S.-made residential batteries and energy plans that aggregate into a virtual power plant — grid flexibility at the edge of the home.
Lumilens Optical interconnect platform connecting AI GPUs at hyperscaler scale.
XBuild AI-native construction estimating and proposal platform for contractors and insurers.

FAQs about Addition

Stage fit, check size, thesis, and how founders typically approach this firm — based on public sources and our directory.

Addition invests from seed through growth equity. The firm leads and co-leads Series A and B rounds and writes very large growth checks into breakout companies. Lee Fixel is the sole senior decision-maker, enabling fast processes.

Public deal history suggests roughly $5M–$20M for early-stage rounds and $30M–$200M+ for growth-stage investments. The firm manages about $6.3B–$7B in assets and can scale check size with conviction.

Addition is headquartered in New York City and invests globally in technology companies, with significant activity in the U.S., Europe, and India among other markets.

Addition is generalist within technology with concentrations in enterprise SaaS, fintech, AI infrastructure, developer tools, and consumer internet. The firm favors founder-led businesses with potential to become category leaders.

Addition frequently leads or co-leads rounds at both early and growth stages. Its concentrated, high-conviction model means fewer bets with larger checks rather than spray-and-pray seed investing.

In our directory, Addition is linked to Applied Intuition (/startup/applied-intuition), Anyscale (/startup/anyscale), Alchemy (/startup/alchemy), Base Power (/startup/base-power), and Xbuild (/startup/xbuild).

Addition does not publish a cold-application funnel. Founders typically need warm introductions from trusted investors, founders, or operators who can vouch for execution. Come with strong traction and a clear path to scale.

We do not yet have dedicated fund news articles tagged to Addition. Browse linked startup profiles from /fund/addition — including Applied Intuition and Anyscale — for portfolio context.

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