The March 2026 US Venture Capital Funding Report

US Startup Funding — March 2026

March’s figures must be contextualized against the extraordinary mega-rounds that defined the prior two months. February 2026’s $62.54B was lifted almost entirely by Anthropic’s $30B and Waymo’s $16B — the two largest venture rounds ever recorded. March 2025’s $53.5B included OpenAI’s $40B, which alone exceeded March 2026’s entire total. Strip those outliers from comparison and the market appears stable: the $19.06B raised in March 2026 sits comfortably within the $15B–$25B monthly range that characterized most of 2024 and 2025.

The month’s capital was concentrated at the extremes. Shield AI’s $2 billion late-stage round for autonomous defense systems and Saronic’s $1.75 billion raise for AI-powered maritime platforms together accounted for nearly 20% of the month’s total. These mega-rounds reflect a specific investor thesis: AI-enabled national security and defense applications command premium valuations in an era of geopolitical tension. Beyond defense, WHOOP ($575M), Sierra Space ($550M), and consumer brands like Quince ($500M) demonstrated that non-AI categories can still command significant late-stage capital when business models are proven and scaling trajectories are clear.

US Funding by Round Type — March 2026

The stage distribution reveals a market driven by late-stage concentration. Late-stage rounds captured 46.7% of capital despite representing just 8.7% of deal count, with an average deal size of $197.9M. This reflects investor preference for companies with demonstrated traction and clear paths to profitability or exit. Series A and Series B rounds combined for $8.71B (45.7% of total capital), signaling healthy mid-funnel activity as companies progress from product-market fit into scaling mode.

Early-stage activity, while accounting for 61.6% of deal count (317 deals), captured just 7.5% of capital ($1.43B). The median early-stage deal of $2.0M and average of $4.5M indicate a seed market that remains active but capital-constrained relative to growth stages. This pattern is consistent with a venture environment where later-stage capital abundance has not trickled down uniformly to the earliest stages.

Top 10 US Venture Capital Deals — March 2026

AI Sector Dominance

AI companies raised $11.46B across 316 deals in March 2026, representing 60.1% of total capital and 50.2% of deal count. This marks a sustained majority even without the frontier model mega-rounds (Anthropic, OpenAI) that characterized prior months. The capital is flowing to applied AI infrastructure, autonomous systems, and vertical AI solutions rather than foundational model development.

Defense and autonomous systems commanded the largest checks: Shield AI ($2.0B) for defense autonomy, Saronic ($1.75B) for maritime AI, and Mind Robotics ($500M Series A) for robotics. Enterprise AI infrastructure also attracted significant capital, with Nexthop AI ($500M Series B), Rhoda AI ($450M Series A), Replit ($400M), and Genspark ($385M) all closing nine-figure rounds. The pattern is clear: AI remains the dominant investment theme, but the capital is shifting from foundational models to application layers and deployment infrastructure.

Geographic Distribution

The standout geographic story is San Diego’s 11.3% share ($2.15B across just 8 deals), driven almost entirely by Saronic’s $1.75B raise for maritime autonomous systems. This single deal demonstrates how mega-rounds can temporarily reshape geographic rankings. Austin’s 10.4% ($1.98B across 17 deals) reflects broader ecosystem momentum in Texas as companies increasingly choose the city for its talent, cost structure, and regulatory environment.

Palo Alto (10.5%) and San Francisco (10.1%) — the traditional Bay Area hubs — captured a combined 20.6% of national capital, a notably smaller share than historical norms where Silicon Valley routinely commanded 35–40% of venture deployment. New York’s 20.7% ($3.94B across 97 deals) continues the city’s pattern of securing an outsized share of national capital, particularly in financial services, healthcare, and enterprise infrastructure — as detailed in AlleyWatch’s separate NYC-specific March 2026 funding report.

Methodology

All data sourced from Crunchbase. Deal counts and funding totals reflect announced and disclosed venture capital transactions with a last funding date in March 2026. Round type classifications follow a standardized four-category taxonomy: Early-Stage (pre-seed through seed), Series A, Series B, and Late-Stage (Series C and beyond, including growth and corporate rounds). AI company identification was applied using pattern matching across company descriptions, industry tags, and organization names. Year-over-year comparisons reference March 2025 figures of $53.5B. Month-over-month comparisons reference February 2026 figures of $62.54B across 462 deals. Classified totals exclude 177 deals categorized as “Unclassified” due to insufficient round type data. Geographic analysis based on headquarters location as reported in Crunchbase.