Top Startup and Tech Funding News – December 2, 2025

Eon Raises $300M Series D, Valuation Triples to $4B

Eon, a cloud data-management startup, announced it has raised $300 million in a Series D round led by Gil Capital. The new funding pushes Eon’s valuation to roughly $4 billion, nearly triple its value a year ago. The round also included existing backers Sequoia Capital, Lightspeed Venture Partners, and Greenoaks, bringing Eon’s total financing since its January 2024 founding to $500 million.

Eon’s software helps enterprises back up and migrate data across AWS, Google Cloud, and Azure. The company plans to use the capital to expand its engineering team and product development, and remain opportunistic about acquisitions as it grows its data backup and continuity platform.

Funding Details:

• Startup: Eon

• Investors: Gil Capital (lead), Sequoia Capital, Lightspeed Venture Partners, Greenoaks

• Amount Raised: $300 million

• Total Raised: $500 million

• Funding Stage: Series D

• Funding Date: December 2, 2025

Yoodli Raises $40M in Series B Funding for AI Conversation Coaching

Seattle-based Yoodli, an AI-powered roleplay platform for communication training, today announced a $40 million Series B funding round led by WestBridge Capital. The company’s software lets users simulate sales calls, interviews, and presentations with customizable AI personas.

The round was backed by WestBridge — a global investment firm — and other venture firms, including Neotribe and Madrona Venture Group. With this influx, Yoodli’s total funding is now about $60 million. The startup says its revenue grew roughly 900% over the past year, and it will use the new capital to scale its product and team as demand for conversational AI training grows.

Founded in 2021 in Seattle, Yoodli started with a straightforward belief: every conversation is an opportunity to get better. The platform uses AI to recreate real-world situations — sales calls, leadership coaching, interviews, and feedback discussions — and offers immediate, individualized guidance. Users can rehearse in private, refine their delivery, and build confidence through repetition.

Funding Details:

• Startup: Yoodli

• Investors: WestBridge Capital (lead), Neotribe Ventures, Madrona Venture Group

• Amount Raised: $40 million

• Total Raised: ~$60 million

• Funding Stage: Series B

• Funding Date: December 2, 2025

Raindrop Raises $15M in Seed Funding for AI-Agent Monitoring

Raindrop, a San Francisco startup building “Sentry-like” observability tools for AI agents, announced a $15 million seed round led by Lightspeed Venture Partners. This backing will help Raindrop expand its monitoring platform that detects and alerts on AI agent failures in production.

Other investors in the round include Figma Ventures, Vercel Ventures, and the founders of Replit, Framer, Speak, and Notion. The founders describe Raindrop as “the default monitoring solution for AI agents,” addressing growing enterprise needs to track the behavior of AI systems. The seed funding will go toward scaling Raindrop’s product and sales efforts as more companies deploy AI agents in critical applications.

Funding Details:

• Startup: Raindrop

• Investors: Lightspeed Venture Partners (lead), Figma Ventures, Vercel Ventures, Amjad Masad & Michele Castata (Replit founders), Walden Yan (Cognition), Koen Bok & Joen van Dijk (Framer), Andrew Hsu (Speak), Akshay Kothari (Notion), plus Y Combinator angels

• Amount Raised: $15 million

• Total Raised: $15 million

• Funding Stage: Seed

• Funding Date: December 1, 2025

Vinci Raises $36M Series A for Chip Simulation Software

Palo Alto-based Vinci has secured $36 million in Series A funding to accelerate its AI-driven chip and hardware simulation platform. The round was led by Xora Innovation (backed by Temasek), with participation from Khosla Ventures and Eclipse. Vinci’s platform uses neural models to speed up tasks like thermal simulation in advanced processor design.

The fresh capital brings Vinci’s total raised to $46 million to date. The team will use the funding to grow its engineering and research teams and expand the simulation capabilities of its platform, aiming to reduce development time for next-generation semiconductor chips dramatically.

Funding Details:

• Startup: Vinci

• Investors: Xora Innovation (lead), Khosla Ventures, Eclipse Group

• Amount Raised: $36 million

• Total Raised: $46 million

• Funding Stage: Series A

• Funding Date: December 2, 2025

Gradium Raises $70M in Seed Funding for AI Voice Technology

Paris-based Gradium announced a massive $70 million seed round co-led by FirstMark Capital and Eurazeo. The startup, spun out of French AI lab Kyutai, is building ultra-low-latency, high-fidelity AI speech models for real-time voice applications. Notable backers joining the round include French telecom magnate Xavier Niel, DST Global Partners, and former Google CEO Eric Schmidt.

Gradium’s founder, Neil Zeghidour, who previously worked at Google DeepMind, says the startup aims to give developers fast, natural-sounding AI voices for games, metaverse experiences, and global voice assistants.

Funding Details:

• Startup: Gradium

• Investors: FirstMark Capital (co-lead), Eurazeo (co-lead), with Xavier Niel, DST Global Partners, and Eric Schmidt

• Amount Raised: $70 million

• Total Raised: $70 million

• Funding Stage: Seed

• Funding Date: December 2, 2025

Kalshi Raises $1B in Series E Funding for Prediction Market Expansion

Kalshi, a New York fintech startup operating a regulated prediction market, has closed a $1 billion Series E round at an $11 billion valuation. The round was led by crypto-focused firm Paradigm, with participation from top-tier VCs including Sequoia, Andreessen Horowitz, Meritech, IVP, ARK Invest, Anthos, CapitalG, and Y Combinator.

This raise comes just weeks after Kalshi’s previous $300 million round and reflects explosive growth: the company says weekly trading volumes now exceed $1 billion, up over 1,000% year-over-year. The new capital will further scale its platform. The company has now raised roughly $1.6 billion since its inception.

Founded in 2018 by MIT classmates Tarek Mansour and Luana Lopes Lara, Kalshi has had its share of legal battles. Last year, it successfully challenged the Commodity Futures Trading Commission in court and won the right to offer contracts tied to the presidential election.

Funding Details:

• Startup: Kalshi

• Investors: Paradigm (lead), Sequoia Capital, Andreessen Horowitz, Meritech Capital, IVP, ARK Invest, Anthos Capital, CapitalG, Y Combinator

• Amount Raised: $1.0 billion

• Total Raised: ~$1.6 billion

• Funding Stage: Series E

• Funding Date: December 2, 2025

Mirror Security Raises €2.1M in Pre-Seed Funding for Encrypted AI Security

Mirror Security, a research-driven startup spun out of University College Dublin, announced a €2.1 million (about $2.5M) pre-seed round to advance its AI security platform. The funding was co-led by Sure Valley Ventures and Atlantic Bridge, with support from strategic angel investors. Mirror Security is developing a suite of cryptographic tools, including a fully homomorphic encryption engine (VectaX), to protect sensitive data during AI computation.

The founders say the technology will allow companies to keep data encrypted even while running AI models.

Funding Details:

• Startup: Mirror Security

• Investors: Sure Valley Ventures (lead), Atlantic Bridge (lead), strategic angel investors

• Amount Raised: €2.1 million ($2.5 million)

• Total Raised: €2.1 million

• Funding Stage: Pre-Seed

• Funding Date: December 2, 2025

Zafran Security Raises $60M in Series C Funding for AI Cybersecurity

Zafran Security, a New York-based cybersecurity startup, announced a $60 million Series C round led by Menlo Ventures. The company, founded in 2022, has built an AI-native exposure management platform that uses autonomous agents to identify and fix security vulnerabilities across large networks.

Other investors in the round include CyberStarts, Knollwood Investment, PSP Growth, Sequoia Capital, and Vintage Investment Partners. This financing brings Zafran’s total funding to $130 million. The company will use the proceeds to accelerate product innovation and global expansion.

Funding Details:

• Startup: Zafran Security

• Investors: Menlo Ventures (lead), CyberStarts, Knollwood Investment, PSP Growth, Sequoia Capital, Vintage Investment Partners

• Amount Raised: $60 million

• Total Raised: $130 million

• Funding Stage: Series C

• Funding Date: December 2, 2025

Antares Raises $96M in Series B Funding for Nuclear Microreactors

Antares Industries, a California-based advanced nuclear energy startup, closed a $96 million Series B round led by Shine Capital. The round included $71 million in new equity and $25 million in equipment financing, with participation from Alt Capital, Caffeinated Capital, FiftyThree Stations, Industrious Ventures, and others.

Antares is developing compact microreactors to deliver resilient power for defense, space, and critical infrastructure. The funding will fuel Antares’ upcoming reactor demonstrations and facility build-out.

Funding Details:

• Startup: Antares

• Investors: Shine Capital (lead), Alt Capital, Caffeinated Capital, FiftyThree Stations, Industrious Ventures

• Amount Raised: $96 million

• Total Raised: $130+ million

• Funding Stage: Series B

• Funding Date: December 2, 2025

Curative Raises $150M in Series B Funding to Reinvent Health Insurance

Austin-based Curative Health Insurance announced it has raised over $150 million in a Series B round, valuing the company at $1.275 billion. The round was led by Chris Anderson’s Upside Vision Fund, with significant participation from early investor Justin Mateen’s JAM Fund and other backers including Galaxy Digital’s Mike Novogratz, Stanley Druckenmiller’s Duquesne Family Office, DCVC, and Martin Varsavsky.

Curative offers an employer-focused health plan with zero out-of-pocket costs and an AI-driven member platform. The new funding will support Curative’s nationwide expansion and further development of its technology.

Funding Details:

• Startup: Curative Health Insurance

• Investors: Upside Vision Fund (lead), JAM Fund, Mike Novogratz (Galaxy Digital), Stanley Druckenmiller (Duquesne Family Office), DCVC, Martin Varsavsky

• Amount Raised: $150 million

• Total Raised: $150 million

• Funding Stage: Series B

• Funding Date: December 2, 2025