The 16 Largest Global Startup Funding Rounds of March 2026

March 2026’s largest startup financings were led by a wave of deals in AI infrastructure, robotics and advanced mobility, with dozens of transactions but a handful registering headline-grabbing sums. According to a roundup by Reza Chowdhury using CrunchBase data, the “top two rounds alone exceeded $3.8B,” underscoring continued investor appetite for both foundational AI companies and capital-intensive hardware plays.

"Looking at the largest global startup funding rounds from March 2026, leveraging data from CrunchBase, we've identified the most significant venture capital deals of the month — a cohort dominated by AI infrastructure, defense autonomy, and robotics, with the top two rounds alone exceeding $3.8B," Chowdhury wrote.

Selected largest rounds and company details

• Also — $200.0M, Series C: Palo Alto-based Also, founded by Chris Yu in 2025, raised $200 million to scale small electric vehicles and modular electric bikes. The company has now raised $505 million in total equity and counts DoorDash, Greenoaks and Prysm Capital among backers.
• Axiom — $200.0M, Series A: Also in Palo Alto, Axiom — founded by Carina Hong in 2025 — develops AI tools for verifying proofs and mathematical reasoning. The round brings Axiom’s total equity to $264 million with investors including Menlo Ventures, Madrona, B Capital and Toyota Ventures.
• eMed — $200.0M, Series A: Miami-based eMed, founded by Dr. Patrice A. Harris in 2020, raised $200 million to expand employer-sponsored population health programs that pair GLP-1 treatment with clinical support. Investors named in the round include Aon, Joe Lonsdale, Tom Brady and Jeff Aronin.
• Eridu — $200.0M, Series A: Saratoga startup Eridu, founded in 2024 by Drew Perkins, Mike Capuano and Omar Hassen, secured $200 million to build AI networking infrastructure for large-scale AI systems. Backers include Bosch Ventures, MediaTek and Hudson River Trading.
• Harvey — $200.0M, Series G: San Francisco-based legal AI provider Harvey, founded by Gabe Pereyra and Winston Weinberg in 2022, raised $200 million in a round that follows $1.2 billion in total equity funding. The company lists OpenAI, Andreessen Horowitz, Sequoia Capital and Kleiner Perkins among its supporters.
• HT Aero — $200.0M, Venture round: Tianhe’s HT Aero, founded by Zhao Deli in 2013 and focused on electric flying vehicles, added $200 million, pushing its total equity raised to $950 million with investors including Gaorong Capital and Shenzhen Capital Group.
• Halter — $220.0M, Series E: Auckland-based Halter, which develops smart collars and virtual fencing for livestock, raised $220 million. Founded by Craig Piggott and Max Olson in 2016, Halter has now raised roughly $418.4 million and is backed by Bessemer, Founders Fund and Bond.
• Kandou AI — $225.0M, Series A: Swiss chip and interconnect specialist Kandou AI, founded by Amin Shokrollah in 2011, raised $225 million, bringing total equity to about $504.7 million with participation from SoftBank Group, Synopsys and Bessemer.
• Grafana Labs — $250.0M, Series E: New York-based Grafana Labs, the open observability platform founded in 2014 by Anthony Woods, Raj Dutt and Torkel Odegaard, closed a $250 million round and has raised $1.1 billion to date with investors such as Lightspeed, Sequoia and Coatue.

Context: the March list compiled by Chowdhury reflects broader allocation trends within venture markets — large cheques flowing to compute-heavy AI infrastructure and capital-intensive hardware firms alongside continued bets on vertical enterprise AI such as legal and health tech. Several companies on the list report prior totals that place them well into late-stage territory, while others are younger firms taking early-but-substantial Series A or B financings.

Outlook: with the month’s two largest rounds alone topping $3.8 billion, investors appear focused on backing companies that can deliver both software differentiation and hardware or systems integration at scale. For founders and limited partners, the March data suggest sustained conviction in AI-enabling stacks, advanced mobility and sector-specific AI applications as durable investment themes into 2026.