Q3 2026's Biggest Semiconductor & Hardware Funding Rounds: SambaNova's $1B Leads 9 Tracked Deals

SambaNova's $1 billion Series F first close, announced July 8, 2026 at an $11 billion valuation, was the biggest semiconductor or hardware funding round Value Add VC had tracked for Q3 2026 as of October 18, 2026 — leading a group of 9 tracked rounds worth roughly $3.75 billion combined.

These are rounds tracked by Value Add VC for US and unconfirmed-HQ private companies, as of October 18, 2026; rumored rounds, public-company raises, and known non-US companies are excluded. This is not a semiconductor market total — it's a slice of the market from the sources Value Add VC follows, meant to be compared quarter to quarter within this series rather than against PitchBook, Crunchbase, or other trackers' totals. Below are the 9 biggest rounds, ranked, each linked to its own source.

Biggest Semiconductor & Hardware Funding Rounds Q3 2026: The Full List, Ranked by Size

Tracked as of October 18, 2026, SambaNova's $1 billion Series F tops the list, followed by Positron AI's $875 million Series C/C-1 tranche at a $5 billion valuation and Fab2's $500 million Series A for compact chip fabs. AI inference and chip-fabrication infrastructure dominated the quarter's biggest hardware checks, a sign of how much capital is still chasing the physical layer underneath AI compute.

Computed from the Value Add VC intelligence store on 2026-10-18: Semiconductors & Hardware funding rounds of US and unconfirmed-HQ private companies announced in Q3 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. How we counted: rounds Value Add VC's intelligence store had on file for Q3 2026; ranked by disclosed round size; 9 rounds shown of 19 tracked deals; as of October 18, 2026.

What Was the Biggest Semiconductor Funding Round in Q3 2026?

SambaNova's $1 billion Series F first close, reported by TechCrunch on July 8, 2026, was the largest semiconductor or hardware round Value Add VC tracked for the quarter. The round, led by General Atlantic, valued the AI chip and inference-systems company at $11 billion, with a second close still expected.

Close behind, Positron AI raised $875 million across a Series C and a Series C-1 tranche, per a company press release dated September 10, 2026, with the Series C-1 lifting the company to a $5 billion post-money valuation — the second-highest mark set by any semiconductor or hardware company Value Add VC tracked this quarter.

How Did Groq's Valuation Change in Q3 2026?

Groq raised a new $350 million round, reported by TechCrunch on August 17, 2026, led by Disruptive with planned participation from Nvidia. The round valued Groq at $3.5 billion, down from the $6.9 billion valuation the company held in September 2025 — a drop TechCrunch says reflects a new Nvidia licensing deal and Groq's pivot from selling AI chips toward operating "neocloud" infrastructure, rather than a traditional down round.

Fab2, formerly known as Atomic Semi, raised $500 million in a Series A led by Fundomo at a $3.7 billion valuation to build compact, lower-cost chip-fabrication facilities, reported September 9, 2026 — a jump from the roughly $100 million valuation of its 2023 seed round.

How We Built This List

This ranking covers US and unconfirmed-HQ private-company semiconductor and hardware funding rounds in the Value Add VC intelligence store that were announced in Q3 2026 (July–September), 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 19 such rounds as of October 18, 2026 — a slice of the market from the sources Value Add VC follows, not a claim to cover every semiconductor or hardware round that closed in the quarter.

One $891 million row the store had on file for the quarter, for Nexchip Semiconductor, was left out of this ranked list after checking its linked source: it was a public Hong Kong share offering rather than a private venture or growth round, which this list's own criteria excludes. Fab2's and Celero Communications' sources on file returned access blocks when checked directly for this list, so both rows are instead cited to outlets that independently confirmed the same figures, FundraiseInsider and the Orange County Business Journal respectively. Ayar Labs' $150 million Series E extension did not disclose a new lead investor in its linked source; the original $500 million Series E it extends was led by Neuberger Berman.

Value Add VC also publishes hand-reconciled Q3 2026 venture-funding figures, where dates and lead investors are corrected after additional review; those figures can differ slightly from this list's as-tracked totals. The full round-level log this list draws from is public at Value Add VC's funding tracker. The same quarter's fintech and crypto funding rounds, defense and space funding rounds, and cybersecurity funding rounds Value Add VC tracked are ranked separately.

What the headline misses

A ranked list by round size blends very different kinds of hardware bets into one table: SambaNova and Positron AI are selling AI inference chips and systems, Fab2 is building the fabs that make chips, Oratomic is building a quantum computer, and Ayar Labs and Eliyan sell chip-to-chip optical and electrical interconnects. Treat "9 biggest rounds" as a size ranking of disclosed amounts across a broad hardware category, not a signal that these companies compete with each other or face the same technical risk.