Series C
Also known as Series C Round, Series C Financing
Series C is a growth-stage equity round for companies approaching profitability or an IPO window, typically used to fund category leadership, international expansion, or acquisitions. Cooley's Q4 2025 report shows median Series C pre-money valuations jumped from $175M in Q3 to $367M in Q4 2025.
In depth
Series C is the round where a company stops looking like a startup and starts looking like a business. The IPO window is in view (3-5 years out), the burn is large but rationalizable against gross margin trajectory, and the cap table is institutional all the way down. The lead investor at Series C is rarely a traditional venture firm. It is usually a crossover fund, a growth-equity firm, or a sovereign-affiliated capital pool.
The economic content has shifted in the past two years. The 2021-vintage Series C, with median pre-money at $300M+, gave way to a 2023-2024 reset where many Series C rounds were down or flat. Cooley's data shows the recovery was sharp: median Series C pre-money valuation more than doubled from $175M in Q3 2025 to $367M in Q4 2025, driven almost entirely by AI deals.
Round size at Series C scales with revenue. A SaaS company at $30M ARR raising Series C typically lands in the $50-75M range. An AI-native infrastructure company at $50M ARR might raise $200M at a $2B valuation in the same quarter.
Why it matters
Series C is the last stage where venture-style dilution applies. From Series D onward, dilution typically compresses to 5-10% per round and the rounds look more like late-stage growth capital. For founders, the cumulative dilution path matters: a company that raises every two years from pre-seed to Series C usually exits Series C with founders holding 15-25%.
For LPs, Series C markups are the cleanest signal that a venture position is converging on a real exit. A Series A position that holds through Series C without being marked down has cleared most of the survivorship risk. Cambridge Associates benchmark data shows that Series A vintages with strong Series C markup rates produce top-quartile fund-level returns.
Worked example
A SaaS company at $40M ARR with 50% YoY growth raises a $75M Series C at $725M pre-money, $800M post-money. The existing option pool is sufficient.
Series C dilution: $75M / $800M = 9.4%
Founder ownership before: 28% (post-Series B)
Founder ownership after: 28% × (1 - 0.094) = 25.4%
Founders hold roughly 25% on a fully diluted basis after Series C, the Series C lead holds 9.4%, and earlier investors plus the option pool absorb the rest. Forward modeling at $800M post: a $5B exit returns Series C investors 6.25x and crystallizes a meaningful DPI distribution if the fund holds through to liquidity.
Frequently asked
What milestones do I need for a Series C?
Series C companies typically show $25-75M ARR, gross margins above 70% for software, and either profitability in sight or a clear path to it. Investors care about Rule of 40, payback period, and net retention. Pure growth at any cost stopped clearing Series C in 2023 and has not come back.
How big is a Series C in 2025?
Round sizes range widely. Carta data shows typical Series C raises of $50-100M, with median pre-money valuation of $367M in Q4 2025 per Cooley. Series C captured roughly 20% of all VC capital deployed in Q3 2025. AI-driven Series C rounds skew far higher, often $200M+ at $1B+ valuations.
How much dilution at Series C?
Median dilution across seed through Series C compressed from about 18% to 16% in 2025 per Carta, with Series C specifically running at 10-13%. Round sizes grew but valuations grew faster, so each dollar bought less. Founders typically hold 15-25% on a fully diluted basis after Series C.
Series C vs growth equity: what is the difference?
The line is fuzzy. A Series C led by a traditional venture firm with a board seat looks like venture. A Series C led by a growth-stage fund with minimal governance and a focus on secondary purchases looks like growth equity. The same company may take either structure depending on which lead clears the round.
Why are Series C valuations rising so fast?
AI concentration. Cooley reported that median Series C pre-money valuations rose from $175M to $367M between Q3 and Q4 2025, with much of the jump driven by a small number of high-priced AI deals. Non-AI Series C valuations rose modestly in the same period; the median masks a bimodal distribution.