December 19, 2025 | 8 min read

AI Funding Frenzy: $6B+ Raised in December 2025 Mega Rounds

December 2025 is shattering funding records as AI startups secure unprecedented valuations. From Databricks' $134B mega-round to record-breaking seed investments, here's everything you need to know.

December 2025 Mega Deals

  • Databricks: $4B+ Series L at $134B valuation
  • Unconventional AI: $475M seed at $4.5B valuation
  • Lovable: $330M Series B at $6.6B valuation
  • Cyera: $400M Series E for AI security
  • Fal: $140M Series D at $4.5B valuation
  • Adaptive Security: $81M Series B (OpenAI + Nvidia backed)

The Mega Deals: Top Funding Rounds

1. Databricks - $4B+ Series L

$134B Valuation

The data lakehouse giant closes one of the largest private funding rounds ever, tripling its valuation from $43B in September 2023.

  • ARR: $4.8B annual revenue run rate
  • Growth: 55%+ year-over-year
  • Investors: Thrive Capital, a16z, Andreessen Horowitz
  • Next: Positioned for potential 2026 IPO

2. Unconventional AI - $475M Seed

$4.5B Valuation

Former Databricks AI head Naveen Rao raises the largest seed round ever for brain-inspired AI hardware.

  • Focus: Energy-efficient AI chips inspired by the human brain
  • Lead: Andreessen Horowitz, Lightspeed Ventures
  • Also: Lux Capital, DCVC
  • Vision: Run advanced AI on dramatically less energy

3. Lovable - $330M Series B

$6.6B Valuation

Swedish "vibe-coding" startup enables users to build entire software applications using natural language prompts.

  • Concept: Build apps with natural language, no coding required
  • Lead: CapitalG (Alphabet), Menlo Ventures
  • Location: Stockholm, Sweden
  • Trend: Pioneering the "vibe coding" movement

4. Cyera - $400M Series E

AI Security

AI-native data security platform continues aggressive expansion with third major round in 18 months.

  • Total Raised: ~$1.7B across recent rounds
  • Focus: AI-powered data protection and security
  • Use of Funds: Global expansion, product development

5. Fal - $140M Series D

$4.5B Valuation

AI model hosting platform for image, video, and audio generation triples valuation from Series C.

  • Lead: Sequoia
  • Also: Kleiner Perkins, Nvidia
  • Product: Host and serve AI models for developers

6. Adaptive Security - $81M Series B

Deepfake Defense

AI-powered deepfake attack simulations for enterprise cybersecurity with notable strategic investors.

  • Lead: Bain Capital Ventures
  • Strategic: NVentures (Nvidia), OpenAI Startup Fund, a16z
  • Product: Simulate deepfake attacks to train enterprise defenses

2025 AI Funding Trends

78%
Top 10 companies captured of total AI funding
49+
US AI startups raised $100M+ in 2025
$13B
Anthropic's September 2025 raise (largest of year)
$183B
Anthropic's valuation (highest private AI company)

Flight to Quality: 2025 shows investors concentrating capital in proven revenue-generating companies rather than speculative bets. The era of "spray and pray" AI investing appears to be over.

Hot Sectors Attracting Capital

🔐

AI Security

Cyera, Adaptive Security leading the charge as enterprises prioritize AI-specific security solutions.

AI Infrastructure

Databricks, Fal, Unconventional AI - the picks and shovels of the AI gold rush.

💻

AI-Native Development

Lovable's "vibe coding" represents a new paradigm where natural language replaces traditional coding.

🧠

Novel AI Hardware

Unconventional AI's brain-inspired chips aim to solve AI's energy problem.

What This Means for Developers

  • Job Market: Well-funded AI companies = aggressive hiring. Look for opportunities at these funded startups.
  • Tools: Expect new AI development tools from Lovable, Fal, and others to mature rapidly with this capital.
  • Security: AI security is becoming a must-have skill as companies invest heavily in this space.
  • Vibe Coding: Natural language programming is real and funded - learn prompt engineering for code generation.

Sources

Dillip Chowdary

Dillip Chowdary

Tech Entrepreneur & Innovator