2026's Biggest Startup Funding Rounds So Far: OpenAI's $122B Leads 9 Tracked Deals

OpenAI's $122 billion round, announced March 31, 2026 and valuing the company at roughly $852 billion, was the biggest US startup funding round Value Add VC had tracked for 2026 as of October 14, 2026 — leading a group of 585 tracked rounds worth $381.5 billion combined.

These are rounds tracked by Value Add VC for US and unconfirmed-HQ private companies, as of October 14, 2026; rumored rounds, public-company raises, and known non-US companies are excluded. This is not a US market total — it's a slice of the market from the sources Value Add VC follows, meant to be compared against other periods in this series rather than against PitchBook, Crunchbase, or other trackers' totals. Below are the 9 biggest rounds tracked from January through September 2026, ranked, each linked to its own source.

Biggest Startup Funding Rounds 2026: The Full List, Ranked by Size

Tracked as of October 14, 2026, OpenAI's $122 billion round tops the list, followed by two separate Anthropic rounds eight months apart — a $30 billion Series G in February and a $65 billion Series H in May — and xAI's $20 billion Series E. Seven of the 9 biggest rounds are tagged AI & Infrastructure in Value Add VC's store, continuing the AI-infrastructure concentration tracked across 2026's biggest AI funding rounds, a companion list drawn from the same store that ranks AI-specific deals beyond just this top 9.

Computed from the Value Add VC intelligence store on 2026-10-14: funding rounds of US and unconfirmed-HQ private companies announced January-September 2026; rumored rounds, public-company raises, and known non-US companies excluded; one record per deal. Not a market total; each company name links its own source. A 10th row the store tracked for this period, a reported $3 billion SPAC-merger valuation for EigenQ, is left out here because that transaction is a public-company deal, not a private funding round, under this list's own definition. How we counted: rounds Value Add VC's intelligence store had on file for January-September 2026; ranked by disclosed round size; 9 of 585 tracked deals; as of October 14, 2026.

What Was 2026's Biggest Startup Funding Round?

OpenAI's $122 billion round, announced March 31, 2026, was co-led by SoftBank Group and Andreessen Horowitz, and valued the company at roughly $852 billion. About $3 billion of the round came from individual investors through retail bank channels, according to the same report. It's the largest round Value Add VC tracked for the period, nearly double the second-place round.

That second-place round, Anthropic's $65 billion Series H announced May 28, 2026, valued the company at $965 billion and came just over three months after Anthropic's own $30 billion Series G at a $380 billion valuation — meaning Anthropic's valuation moved roughly 2.5x in under four months, entirely through rounds disclosed by the company itself.

Which Sectors Took the Biggest Checks in 2026?

Seven of the 9 biggest rounds Value Add VC tracked for 2026 through September are tagged AI & Infrastructure: OpenAI, both Anthropic rounds, xAI, Prometheus, Databricks, and Crusoe. The two exceptions are Waymo's $16 billion round (Robotics & Mobility) and Anduril Industries' $5 billion Series H (Defense & Space), co-led by Thrive Capital and Andreessen Horowitz at a $61 billion valuation.

Databricks' $5 billion Strategic Growth round, reported by Bloomberg on August 13, 2026 at a $190 billion valuation and led by Coatue Management, ties Anduril for 7th place by round size, underscoring that AI-infrastructure capital in 2026 wasn't limited to frontier model labs — data and analytics platforms raised at similar scale.

How We Built This List

This ranking covers US and unconfirmed-HQ-private-company funding rounds in the Value Add VC intelligence store that were announced between January and September 2026, with one record kept per deal. It excludes rumored rounds, public-company capital raises, and companies with a confirmed non-US headquarters. The store tracked 585 such rounds worth $381.5 billion combined as of October 14, 2026 — a slice of the market from the sources Value Add VC follows, not a claim to cover every round that closed in the period. Coverage in January through May 2026 is thinner than later months (fewer than 50 tracked rounds in each of those five months), which reflects the store tracking fewer rounds early in the year, not fewer rounds happening.

Every row above is checked against its own linked source, with one exception: Databricks' source, a Bloomberg report, returned an access error on re-check, so that row's figures are kept as tracked and attributed to Bloomberg rather than independently re-verified here. A 10th deal the store had flagged for this period, a roughly $3 billion valuation reported for EigenQ, was dropped from this list entirely: on re-check, that deal is a SPAC merger with a blank-check company, not a private funding round, so it falls outside this list's own definition.

The full round-level log this list draws from is public at Value Add VC's funding tracker.

What the headline misses

A ranked list by round size compresses very different kinds of rounds into one table. xAI's $20 billion raise is confirmed by the company, but the roughly $230 billion valuation attached to it in press reports has never been confirmed by xAI itself, and some early reporting put the figure closer to $200 billion before settling near $230 billion — treat that specific number as reported, not official. OpenAI's $852 billion figure is also not explicitly labeled pre- or post-money in the source report. And because this list ranks by headline round size alone, it says nothing about capital efficiency, revenue, or burn — a $122 billion round and a $3.9 billion round aren't on the same risk curve just because they're both "big."