Series C funding is a milestone in the development of a company. The company has pushed past early uncertainties and has demonstrated that its product works in the market. Now it’s ready to scale, whether that’s moving into new areas, making acquisitions or preparing for an IPO (the first time a company sells shares to the public). Series A and B are focused on discovering a working model and proving that it can develop. With Series C, they want to speed up that growth to the point where they need institutional-scale capital.
What makes a Series C round particularly noteworthy is not just the dollar amount, but what it signals: that institutional investors, sovereign wealth funds, private equity firms, large asset managers are confident enough to write billion-dollar checks. The rounds in this article are the largest Series C rounds ever completed, and together they tell the story of which technologies and industries attracted the most conviction capital in the last decade.
This article covers each round in detail, what drove the investment, who the key backers were, and what the 2025-2026 funding environment looks like for companies approaching this stage.
Key Takeaways
- Ant Group’s $14B round (2018) remains the largest Series C ever closed, more than double the next-largest.
- AI now dominates the list: five of the top 10 rounds since 2024 went to AI companies, from large language model (LLM) developers to robotics platforms.
- Autonomous vehicles still attract mega-rounds: Waymo’s $5.6B Series C in 2024 ranks third all time.
- The median Series C is far smaller than the average: in 2025, the median US round was roughly $52M while the average hit $140M, a gap driven by a handful of AI outliers.
- 2026 rounds are already appearing: DayOne ($2.5B), Nscale ($2.0B), and Skild AI ($1.4B) have all closed Series C rounds this year.
What is a Series C Funding Round?
A Series C round is a late-stage venture financing event that typically occurs after a company has already raised Series A and Series B capital. At this point, the company is expected to have a proven product, recurring revenue, and a demonstrated ability to grow. The purpose of a Series C is usually one or more of the following: expanding into new markets, funding an acquisition, building out enterprise sales infrastructure, or preparing for an IPO or strategic acquisition exit.
Series C investors are a different breed from early-stage backers. Rather than taking a bet on an unproven idea, they are making a calculated decision based on existing financial data, unit economics (the revenue and cost per unit of the business), and comparable public-market valuations. This is why Series C rounds often include participants that don’t appear in earlier rounds: hedge funds, sovereign wealth funds (government-managed investment pools), large pension funds, and corporate strategics.
How Series C Differs from Series A and Series B
Series A rounds typically raise between $5M and $30M to hire a core team and build out the initial product. Series B rounds (usually $30M to $150M) are about proving the business can scale: growing the customer base, expanding the sales team, and achieving consistent revenue growth. By Series C, those questions are largely answered. The capital raised often $100M to $1B or more in today’s environment is deployed for execution at scale. Due diligence at Series C focuses heavily on unit economics, total addressable market size, path to profitability, and the company’s readiness for public markets or a strategic exit.
The composition of investors also shifts. Series C syndicates frequently include crossover investors funds that invest in both public and private companies, like T. Rowe Price, Fidelity, and BlackRock because these investors are effectively making an early bet on a company they expect to hold through an IPO.
What Makes a Series C Round ‘Large’?
Most Series C rounds raise between $50 million and $150 million. A round earns the label ‘large’ when it clears three thresholds at once. The raise size typically exceeds $500 million. The post-money valuation the company’s total implied worth after the investment pushes past $1 billion. And the investor lineup shifts from traditional venture capital firms to sovereign wealth funds (government-owned investment vehicles), global private equity houses, and corporate strategics. When all three conditions align, it signals that the company is preparing for a public offering or aggressive global expansion, not just a new product line.
Top 10 Largest Series C Rounds in History
| Rank | Company | Amount Raised | Year | Sector | Notable Investors |
|---|---|---|---|---|---|
| 1 | Ant Group | $14.0B | 2018 | Fintech | GIC, Warburg Pincus, Temasek, CPPIB, Silver Lake, General Atlantic, The Carlyle Group |
| 2 | xAI | $6.0B | 2024 | AI / LLM | A16Z, BlackRock, Sequoia Capital, Lightspeed, NVIDIA, AMD, Kingdom Holdings |
| 3 | Waymo | $5.6B | 2024 | Autonomous Vehicles | Alphabet, A16Z, Fidelity, Perry Creek, Silver Lake, Tiger Global, T. Rowe Price |
| 4 | Meituan | $4.0B | 2017 | E-commerce / Food Tech | Tencent, DST Global, Sequoia China |
| 5 | DayOne | $2.5B | 2026 | Data Centers | Institutional investors (undisclosed) |
| 6 | Nscale | $2.0B | 2026 | AI Infrastructure | Undisclosed |
| 7 | Mistral AI | $2.0B | 2025 | AI / LLM | ASML (lead, EUR 1.3B), DST Global, A16Z, General Catalyst, Lightspeed, NVIDIA |
| 8 | Avatr | $1.52B | 2024 | EV / Automotive | CATL, Changan Automobile |
| 9 | JD.com | $1.5B | 2011 | E-commerce | DST Global, Kingdom Holdings, Tiger Global |
| 10 | Skild AI | $1.4B | 2026 | AI Robotics | General Atlantic, SoftBank, Jeff Bezos |
Company Spotlights: Inside the Top Rounds
1. Ant Group – $14 Billion (2018)
Ant Group (then Ant Financial) closed its Series C on June 8, 2018, raising $14 billion in what remains the single largest Series C round ever recorded. The raise was structured across two tranches: a Chinese yuan (RMB) portion subscribed by existing domestic shareholders and a US dollar portion backed by a global consortium of institutional investors that included GIC, Temasek, Warburg Pincus, Canada Pension Plan Investment Board (CPPIB), Silver Lake, General Atlantic, The Carlyle Group, and Khazanah Nasional. The round valued Ant at approximately $150 billion, more than double its $60 billion Series B valuation from 2016 making it the most valuable private company in the world at the time.
The capital was earmarked to accelerate Alipay’s international expansion across Southeast Asia and South Asia, invest in blockchain infrastructure, and develop AI capabilities for credit scoring and risk management. Ant’s planned dual IPO on the Hong Kong Stock Exchange and Shanghai STAR Market was expected to raise up to $34.5 billion which would have been the world’s largest IPO ever.
Chinese financial regulators suspended the offering in November 2020 just two days before it was set to launch, citing new regulations on online lending. As a result, the 2018 Series C remains the high-water mark of Ant’s private-market history.
2. xAI- $6 Billion (December 2024)
Elon Musk’s AI company xAI closed a $6 billion Series C on December 23, 2024, with participation from Andreessen Horowitz (A16Z), BlackRock, Sequoia Capital, Fidelity Management and Research, Lightspeed Venture Partners, Kingdom Holdings, MGX, Morgan Stanley, QIA, Valor Equity Partners, and Vy Capital, alongside strategic investors NVIDIA and AMD.
The funds were designated to expand xAI’s Colossus supercomputer at the time of the round, the world’s largest AI training cluster with 100,000 NVIDIA Hopper GPUs and to develop its Grok large language model and Aurora image generation model. The round followed a $6B Series B just six months earlier, bringing xAI’s total capital raised to $12 billion. At a reported valuation of approximately $40-50 billion, xAI positioned itself as the most-funded private AI lab outside of OpenAI and Anthropic.
3. Waymo – $5.6 Billion (October 2024)
Alphabet’s autonomous driving unit Waymo announced the close of a $5.6 billion oversubscribed Series C on October 25, 2024 the company’s largest single funding round ever, bringing its cumulative capital raised to $11.1 billion. The round was led by Alphabet and included Andreessen Horowitz, Fidelity Investments, Perry Creek Capital, Silver Lake, Tiger Global, and T. Rowe Price. Alphabet had pledged a multi-year $5 billion commitment to Waymo in July 2024, and this round formalized a significant portion of that commitment.
The capital is being used to deepen Waymo’s robotaxi footprint across San Francisco, Phoenix, Los Angeles, Austin, and Atlanta the latter through its Uber partnership and to advance its sixth-generation Waymo Driver system integrated into Geely’s all-electric Zeekr vehicles. In February 2026, Waymo completed a follow-on round of $16 billion at a $126 billion valuation, confirming the commercial momentum built on the Series C foundation.
4. Meituan – $4 Billion (2017)
Meituan (formerly Meituan-Dianping), China’s dominant food delivery and local services super-app, raised $4 billion in its 2017 Series C, led by Tencent with participation from DST Global and Sequoia China. At the time, this was the largest venture round ever completed in China.
The capital funded Meituan’s expansion from restaurant reviews and food delivery into hotel booking, movie ticketing, and bike-sharing effectively building out the ‘everything’ layer for Chinese local commerce. Meituan listed on the Hong Kong Stock Exchange in September 2018 at an $11 billion valuation and has since grown into one of the world’s largest internet companies by market capitalization.
The 2025-2026 AI Infrastructure Cluster
Three rounds in the $2-2.5 billion range reflect a distinctive 2025-2026 theme: capital flowing not just into AI applications but into the computer and infrastructure layer that powers them.
DayOne (the international data center arm of GDS Holdings) closed a $2.5 billion Series C in 2026, backed by institutional investors to fund hyperscale data center capacity across Asia and the Middle East. Nscale, a European AI compute provider, raised $2 billion in a 2026 Series C to expand its GPU cloud infrastructure for enterprise AI workloads.
And Mistral AI, the French AI lab founded by former DeepMind and Meta researchers, closed a $2 billion (EUR 1.7 billion) Series C in September 2025 led by ASML, the Dutch semiconductor equipment company, which invested EUR 1.3 billion for an approximately 11% stake making ASML Mistral’s single largest shareholder.
The round valued Mistral at $13.8 billion and was the largest VC round ever completed by a European AI company. Other investors included DST Global, Andreessen Horowitz, Bpifrance, General Catalyst, Lightspeed, and NVIDIA.
Sector Breakdown: Which Industries Attract the Largest Series C Rounds?
Looking across the top 10 rounds, a clear sector pattern emerges. Capital has not been spread evenly; it has concentrated in three areas that share a common characteristic: they each require massive upfront infrastructure investment before the unit economics begin to look attractive.
Fintech (32% of total capital)
Ant Group’s $14B round alone accounts for the majority of this category. Fintech rounds of this size tend to reflect the global ambition of payment and lending platforms. These businesses need capital to secure regulatory licenses, build local partnerships, and subsidize user acquisition across dozens of markets simultaneously. The infrastructure cost of becoming a global payments network is genuinely comparable to building a physical bank network, which justifies the scale.
AI and AI Infrastructure (26% of total capital)
This is the fastest-growing category on the list, with all four entries (xAI, Mistral AI, Nscale, Skild AI) appearing between late 2024 and mid-2026. The common thread is compute: training large AI models and running inference at scale requires clusters of thousands of GPUs costing hundreds of millions of dollars per year to operate. Both model developers (xAI, Mistral AI) and infrastructure providers (Nscale) are rising at a scale that mirrors the early build-out of cloud computing in the 2010s.
Autonomous Vehicles and EV (16% of total capital)
Waymo ($5.6B) and Avatr ($1.52B, the premium EV brand backed by CATL and Changan Automobile) represent this category. Autonomous vehicle companies are structurally similar to AI infrastructure companies: they need capital to accumulate miles of real-world training data, manufacture or lease a large vehicle fleet, and build city-by-city regulatory relationships. This makes them naturally suited to very large rounds with patient institutional capital.
Series C Fundraising in 2025-2026: What Has Changed
The Post-Peak Correction and Recovery
The 2021-2022 venture market peak produced an environment where Series C rounds were inflated across nearly every sector, driven by near-zero interest rates and intense investor competition. The sharp rate rises of 2022 triggered a significant correction. According to the PitchBook-NVCA Venture Monitor, the total value of Series C and Series D deals fell from $146 billion in 2021 to $93.7 billion in 2022 a 36% single-year drop and late-stage deal value declined for seven consecutive quarters through Q1 2023. Series C valuations dropped by approximately 50% between Q4 2021 and Q4 2022 alone, as investors pulled back, re-underwrote their assumptions, and demanded clearer paths to profitability before writing large checks.
The recovery that began in late 2023 and accelerated through 2024-2025 has been sharply bifurcated. Companies in AI and adjacent infrastructure have been able to raise at 2021-era or larger sizes. Everything else consumer tech, edtech, most SaaS has seen a more modest normalization rather than a full recovery. According to Osler’s 2025 Deal Points Report, the median US Series C in 2025 was approximately $52 million while the mean was $140 million. This gap nearly three times the median is almost entirely explained by a small number of AI mega-rounds pulling the average up.
What the 2026 Data Tells Us
As of September 2026, the Series C market continues to bifurcate along the same lines. The largest rounds are going to AI compute infrastructure (Nscale, $2B), data centers serving AI workloads (DayOne, $2.5B), and companies building general-purpose physical AI (Skild AI, $1.4B building robotics foundation models backed by General Atlantic, SoftBank, and Jeff Bezos). Autonomous vehicles continue to attract large capital: Waabi, the Toronto-based self-driving trucking company, closed a $750M Series C in January 2026.
The broader pattern is significant: investors are no longer funding primarily AI applications software products built on top of existing AI models. The capital is increasingly going into the foundational layer: the GPUs, the data centers, the training infrastructure, and the robotics systems that form the physical backbone of the AI economy. This mirrors the investment pattern seen in cloud infrastructure a decade ago, where the largest rounds went to companies building the servers and networking that AWS, Azure, and Google Cloud would eventually operate at scale.
Valuation Trends
One notable feature of 2025-2026 Series C rounds is the prevalence of ‘up rounds’ rounds completed at a higher valuation than the company’s previous raise. Osler’s data shows that 80% of all Series C rounds completed in 2025 were up rounds, the highest share since 2021. This contrasts sharply with 2023, when down rounds (rounds completed below the prior valuation) were common even for well-performing companies, simply because prior valuations had been set during the 2021 froth. The return of up rounds signals that valuations have re-anchored to fundamentals at least for companies able to raise at all.
FAQs
Questions below cover the most common ones from what a typical round looks like in size and structure, to what happens to the cap table once the round closes.
Most Series C rounds raise between $50 million and $100 million, with the US median at roughly $52 million in 2025 according to Osler’s 2025 Deal Points Report. The mean is substantially higher ($140 million) because a small number of AI and deep-tech companies raise $1 billion or more, pulling the average up.
By Series C, the investor mix expands well beyond venture capital. Sovereign wealth funds (government investment vehicles like Singapore’s GIC or Abu Dhabi’s MGX), large asset managers (BlackRock, Fidelity, T. Rowe Price), global private equity firms, and corporate strategics (NVIDIA, ASML) all appear regularly in the largest rounds. These investors bring market access and distribution relationships that are valuable as a company prepares for a public offering.
Series B is about proving the business can scale beyond its initial market. Series C assumes that question is answered and focuses on aggressive expansion, new geographies, acquisitions, or IPO preparation. IPO stands for initial public offering, when a company sells shares to the public for the first time. Round sizes at Series C are typically three to five times larger than at Series B, and investor diligence focuses more on unit economics and public-market comparables than on product-market fit.
Every new funding round dilutes the ownership percentage of existing shareholders, including founders and early employees. By Series C, a founding team may hold 20% to 35% of the company, down from nearly 100% at founding. Cap table management becomes critical at this stage because the ownership structure directly affects liquidation preferences, the rules that determine who gets paid first and how much if the company is sold or goes public.
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