February’s 15 biggest U.S. startup rounds topped $53B, led by a $30B deal spanning AI and frontier tech

A single $30 billion transaction helped propel February’s largest U.S. startup financings to more than $53 billion in total, according to data compiled from Crunchbase. The top 15 rounds ranged from $200 million to $30 billion and cut across AI semiconductors, humanoid robotics, fusion energy, and space infrastructure.

Artificial intelligence and enterprise infrastructure featured prominently among named recipients. Emeryville-based Oxide Computer Company, founded in 2019 by Bryan Cantrill, Jessie Frazelle, and Steve Tuck, raised a Series C to expand its on‑premises server rack systems.

Investors in the round included Eclipse Ventures, Jane Street Capital, Riot Ventures, and the US Innovative Technology Fund. Oxide has raised $394.0M in total equity funding and is backed by Eclipse Ventures, Friends & Family Capital, US Innovative Technology Fund, Rally Ventures, and Riot Ventures.

Reno-based Positron, an AI infrastructure company designing hardware and software for transformer‑based models, closed a Series B. The company, founded in 2023 by Barrett Woodside and Thomas Sohmers, has raised $305.1M in total equity funding. Investors in the round included 1517 Fund, ARENA Private Wealth, Arm Holdings, and Atreides Management.

Positron is backed by Valor Equity Partners, DFJ Growth, Unless, Qatar Investment Authority, and 1517 Fund. Early-stage AI also drew substantial backing. San Francisco-based Fundamental, an AI research company focused on addressing foundational machine‑learning challenges, completed a Series A.

Founded in 2024 by Gabriel Suissa and Jeremy Fraenkel, Fundamental has raised $255.0M in total equity funding. Investors in the round included Aravind Srinivas, Assaf Rappaport, Battery Ventures, Drysdale Ventures, Headline, Henrique Dubugras, Hetz Ventures, Oak HC/FT, Olivier Pomel, QP Ventures, Quadrille Capital, RRE Ventures, Salesforce Ventures, and Valor Equity Partners.

Healthcare saw continued investment at scale. New York-based Talkiatry, which provides virtual mental healthcare services covered by insurance and connects patients with licensed psychiatrists, raised a Series D. Founded in 2019 by Georgia Gaveras and Robert Krayn, the company has secured $452.0M in total equity funding.

Investors in the round included Andreessen Horowitz, Blisce, Left Lane Capital, Perceptive Advisors, and Sofina. Talkiatry is backed by Andreessen Horowitz, Left Lane Capital, Perceptive Advisors, Blisce, and GreyMatter. Digital marketplaces were also represented.

Brooklyn-based Whop, a marketplace for entrepreneurs to buy and sell communities, courses, and software, closed a venture round with participation from Tether Ventures. Founded in 2021 by Cameron Zoub, Jack Sharkey, and Steven Schwartz, Whop has raised $273.0M in total equity funding and is backed by Insight Partners, Bain Capital Ventures, A*, SignalFire, and Motley Fool Ventures.

The breadth of February’s mega-rounds—spanning AI semiconductors, humanoid robotics, fusion energy, and space infrastructure—highlights where sizable late-stage capital flowed during the month, with deal sizes stretching from $200 million to the $30 billion outlier.