Top Startup and Tech Funding News – March 31, 2025

It’s Tuesday, March 31, 2026, and we’re back with today’s top startup and tech funding news. Today’s rounds highlight a surge in capital flowing into AI infrastructure, autonomous defense systems, fintech rails, and next-generation healthcare. From massive late-stage bets to early-stage data platforms, investors are doubling down on technologies that sit at the core of how intelligence, capital, and global systems will operate in the years ahead.

Large growth rounds underscore continued conviction in AI platforms, maritime autonomy, and wearable health ecosystems, while mid-stage financings point to rising demand for cloud automation, identity security, and cross-border payments. At the same time, early-stage startups are attracting capital by tackling foundational data challenges in robotics and enterprise IT. Today’s deals span AI, defense, fintech, biotech, and infrastructure—and reflect a market prioritizing scale, efficiency, and control over critical systems.

Tech Funding News

Funding Highlights

• OpenAI raises $122B mega-round to scale AI infrastructure and research
• Saronic raises $1.75B Series D to expand autonomous ship production
• Whoop raises $575M Series G to grow wearable health platform
• 9fin raises $170M Series C for AI-powered credit analytics
• ScaleOps raises $130M Series C to automate cloud and AI infrastructure
• Ambrosia Biosciences raises $100M Series B for oral obesity therapeutics
• OpenFX raises $94M to modernize cross-border payments with stablecoins
• Linx Security raises $50M Series B for AI-native identity governance
• Treeline raises $25M Series A to build AI-driven IT platform
• Nomadic raises $8.4M seed to structure autonomous vehicle data

Investor Activity

Today’s funding wave saw strong participation from both venture firms and institutional capital targeting core infrastructure across AI, defense, and financial systems. Andreessen Horowitz, Insight Partners, and Kleiner Perkins backed platforms building the operational backbone for enterprise AI and automation, while global investors, including sovereign funds and healthcare-focused firms, leaned into wearables and biotech. Across stages, capital continues to cluster around companies solving hard infrastructure problems—where control over data, compute, and real-world systems creates long-term strategic advantage.

OpenAI Raises $122B in Record-Breaking Round to Fuel AI Expansion

OpenAI, the maker of ChatGPT, announced a $122 billion funding round at an $852 billion valuation. The deal was co-led by SoftBank and Andreessen Horowitz, with participation from Amazon, Microsoft, Nvidia, and others. About $3 billion of the capital came from individual investors via ARK Invest–managed funds. The massive infusion will bankroll OpenAI’s AI research, cloud infrastructure, and talent acquisition as the company scales up its services.

OpenAI is already generating roughly $2 billion in monthly revenue and is rapidly expanding its consumer and enterprise user base. The round also sets the stage for OpenAI’s expected public offering, anchoring investor expectations and supporting long-term growth in AI compute and products.

• Startup: OpenAI (AI research and applications)
• Investors: SoftBank (lead), Andreessen Horowitz, Amazon, Microsoft, Nvidia, and others; plus ~$3B from retail investors
• Amount Raised: $122.0 billion
• Total Raised: $122.0 billion
• Funding Stage: Private mega-round (pre-IPO)
• Funding Date: March 31, 2026

Saronic Raises $1.75B in Series D Funding to Scale Autonomous Ship Production

Saronic, a maritime autonomy startup building uncrewed surface vessels, secured a $1.75 billion Series D funding round. The round was led by Kleiner Perkins and included existing investor 8VC and newcomer Advent International. This capital will significantly expand Saronic’s production capacity: CEO Dino Mavrookas said the funds will help launch new autonomous vessels, scale up shipyards (including a new “Port Alpha” facility), and accelerate deliveries of its unmanned cargo and patrol ships.

The raise comes amid growing demand for automated maritime logistics, especially for defense and commercial applications. Kleiner Perkins partner Schuster Tanger noted that Saronic’s technology and team are “building out a whole new shipbuilding industry,” as the funding will help turn this vision into reality.

• Startup: Saronic (autonomous maritime vessels)
• Investors: Kleiner Perkins (lead); existing investor 8VC; new investor Advent International
• Amount Raised: $1.75 billion
• Total Raised: $1.75 billion
• Funding Stage: Series D
• Funding Date: March 31, 2026

Whoop Raises $575M in Series G Funding to Boost Global Wearable Health Platform

Whoop, the wearable fitness-tracking company, announced a $575 million Series G round led by Collaborative Fund. The round valued the Boston-based startup at about $10.1 billion and brings its total funding to roughly $900 million. Investors included Mubadala (Abu Dhabi’s sovereign fund), Qatar Investment Authority, 2PointZero Capital, Abbott Laboratories, and Mayo Clinic, alongside celebrity backers Cristiano Ronaldo and LeBron James. Whoop’s platform uses wearable sensors and AI analytics to monitor athletes’ health and recovery. The new funding will fuel international expansion and product development: the company plans to add more wellness features, support a growing global customer base (including professional sports teams), and deepen its analytics capabilities. This comes as demand for advanced health-monitoring devices surges, and Whoop aims to solidify its position in the fast-growing wearable health market.

• Startup: Whoop (wearable health analytics)
• Investors: Collaborative Fund (lead); Mubadala, Qatar Investment Authority, 2PointZero, Abbott Laboratories, Mayo Clinic; plus Cristiano Ronaldo and LeBron James
• Amount Raised: $575 million
• Total Raised: ~$900 million
• Funding Stage: Series G
• Funding Date: March 31, 2026

9fin Raises $170M in Series C Funding for AI-Powered Credit Data Analytics

9fin, a London-based fintech providing AI-driven credit research, closed a $170 million Series C round led by HarbourVest Partners. The round valued the company at about $1.3 billion, making it one of Europe’s newest fintech unicorns. Other participants included Canada Pension Plan Investment Board, Highland Europe, Spark Capital, Redalpine, and Seedcamp. 9fin’s platform uses AI to deliver real-time credit market analytics and data for bonds and loans.

The startup will use the proceeds to further embed AI in its tools, expand its credit dataset, and accelerate U.S. growth. 9fin also plans to boost its presence in the U.S. market as part of a wider strategy to modernize debt capital markets, leveraging the round to enhance its technology and analytics offerings.

• Startup: 9fin (credit market analytics)
• Investors: HarbourVest Partners (lead); Canada Pension Plan Investment Board, Highland Europe, Spark Capital, Redalpine, Seedcamp
• Amount Raised: $170 million
• Total Raised: >$250 million
• Funding Stage: Series C
• Funding Date: March 31, 2026

ScaleOps Raises $130M in Series C Funding to Automate Cloud and AI Infrastructure

ScaleOps, a New York-based autonomous cloud infrastructure startup, announced a $130 million Series C round led by Insight Partners. Existing investors Lightspeed Venture Partners, NFX, Glilot Capital, and Picture Capital also participated. This round values ScaleOps at over $800 million and brings its total funding to more than $210 million. ScaleOps’s software continuously manages cloud resources (CPU, memory, GPUs) in real time, automatically scaling capacity to match demand for AI and other workloads.

The company said demand for its platform has spiked as businesses struggle with the rapid growth of AI applications. The new funds will accelerate product development, help ScaleOps expand its enterprise customer base, and allow it to triple its headcount – especially engineering – to keep pace with growth.

• Startup: ScaleOps (AI/cloud infrastructure automation)
• Investors: Insight Partners (lead); Lightspeed, NFX, Glilot Capital, Picture Capital
• Amount Raised: $130 million
• Total Raised: $210 million
• Funding Stage: Series C
• Funding Date: March 31, 2026

Ambrosia Biosciences Raises $100M in Series B Funding for Oral GLP-1 Obesity Drug Development

Ambrosia Biosciences, an obesity drugmaker, closed a $100 million Series B round to advance its pipeline of small-molecule treatments. The financing was co-led by Blue Owl Healthcare Opportunities, Redmile, and Deep Track Capital, with participation from existing investors BVF Partners and Boulder Ventures, as well as new backers Janus Henderson and Samsara BioCapital. Ambrosia’s lead candidate is an oral, small-molecule GLP-1 receptor agonist designed to treat obesity and metabolic disease.

Unlike current injectable GLP-1 drugs, Ambrosia’s pill could offer a more convenient option. The funding will support the company’s plans to begin a first-in-human study of its oral GLP-1 drug. In statements, Ambrosia noted the round was oversubscribed and is intended to move its lead program toward clinic entry, positioning the company in the high-demand obesity treatment market.

• Startup: Ambrosia Biosciences (obesity/metabolic therapeutics)
• Investors: Blue Owl Healthcare, Redmile, Deep Track (co-leads); BVF Partners, Boulder Ventures, Janus Henderson, Samsara BioCapital
• Amount Raised: $100 million
• Total Raised: $100 million
• Funding Stage: Series B
• Funding Date: March 31, 2026

OpenFX Raises $94M to Modernize Cross-Border FX Payments with Stablecoins

OpenFX, a fintech startup specializing in foreign exchange markets, today raised $94 million in an equity round. The round was led by venture firms including Accel, Atomico, and Lightspeed Faction, with additional participation from M13, Northzone, and Pantera Capital. The new funding values OpenFX at roughly $500 million and will support its expansion into Southeast Asia and Latin America, where demand for fast, efficient FX services is rising.

OpenFX uses blockchain-based stablecoins to enable near-instant settlement of large FX transactions (often within an hour, compared to days in legacy markets). The company reported that its annualized payment volume surged to $45 billion in early 2026 (up from $4 billion the previous year). The capital will accelerate its global growth by tapping into the rising trend in blockchain-enabled remittances and cross-border payments.

• Startup: OpenFX (FX payments platform)
• Investors: Accel, Atomico, Lightspeed Faction (lead); M13, Northzone, Pantera Capital
• Amount Raised: $94 million
• Total Raised: ~$117 million
• Funding Stage: Growth equity round
• Funding Date: March 31, 2026

Linx Security Raises $50M in Series B Funding for AI-Native Identity Governance

Linx Security, a New York-based identity security startup, announced a $50 million Series B financing led by Insight Partners. Existing investors Cyberstarts and Index Ventures also participated, bringing Linx’s total funding to $83 million. Linx delivers an AI-first platform that continuously maps and monitors every digital identity (human or machine) across an enterprise, automating remediation of access risks.

Linx Security noted that non-human identities now outnumber human users by roughly 80 to 1, creating acute governance challenges. The new funds will help Linx expand its product (including its new “Autopilot” AI agent for real-time identity checks), grow its sales organization, and deepen integrations with large enterprises. Linx’s founders said the round will enable the company to meet surging demand for autonomous identity governance as organizations adopt more cloud and AI services.

• Startup: Linx Security (AI-based identity governance)
• Investors: Insight Partners (lead); Cyberstarts, Index Ventures
• Amount Raised: $50 million
• Total Raised: $83 million
• Funding Stage: Series B
• Funding Date: March 31, 2026

Treeline Raises $25M in Series A Funding to Build a Modern AI-Powered IT Platform

Treeline, a San Francisco startup aiming to modernize corporate IT services, secured a $25 million Series A round led by Andreessen Horowitz. Treeline is developing an AI-driven “operating system” for IT management, automating tasks such as employee onboarding, device provisioning, and help desk support. The company’s platform layers intelligent agents and unified software on top of traditional managed service providers; these agents reportedly handle 98% of routine support requests instantly.

Treeline plans to use the funding to accelerate product development, hire engineers, and expand its sales and marketing teams. Existing backers Lightspeed Venture Partners and Info Edge Ventures also participated. The raise comes as global IT spending tops $6 trillion and companies increasingly seek AI-driven efficiencies in managing their tech infrastructure.

• Startup: Treeline (AI-powered IT services)
• Investors: Andreessen Horowitz (lead); Lightspeed Venture Partners, Info Edge Ventures
• Amount Raised: $25 million
• Total Raised: $25 million
• Funding Stage: Series A
• Funding Date: March 31, 2026

Nomadic Raises $8.4M in Seed Funding to Structure Autonomous Vehicle and Robotics Data

Nomadic, an AI startup founded by former Lyft and Snowflake engineers, announced an $8.4 million seed round. The funding was led by TQ Ventures, with participation from Pear VC and Google AI veteran Jeff Dean. Nomadic’s platform ingests raw video from autonomous vehicles and robots and uses vision-language models to extract structured insights and annotations. This allows companies like Zoox, Mitsubishi Electric, and others to quickly search and label critical events in their sensor data (for example, identifying every instance of an AV encountering a stop sign or unusual obstacle).

Nomadic will use the seed capital to refine its vision analytics toolset and onboard more customers, effectively turning unwieldy AV/robotic footage into high-quality datasets for training and testing AI systems. The team won NVIDIA’s GTC pitch contest last month, underscoring industry interest in its approach to automating what was once a manual data-labeling process.

• Startup: Nomadic (autonomous vehicle/robotics data AI)
• Investors: TQ Ventures (lead); Pear VC; Jeff Dean
• Amount Raised: $8.4 million
• Total Raised: $8.4 million
• Funding Stage: Seed
• Funding Date: March 31, 2026

Tech Funding Summary Table