Nvidia-Backed Mercor Leads $3.58B of AI Rounds in 3 Days

AI start-ups announced 23 funding rounds from 9 to 11 November that FourWeekMBA covered, and together they total $3.58 billion, by our arithmetic. The largest was Mercor’s $750 million Series D at a $20 billion valuation, with NVIDIA among 13 investors named in its release.

Three infrastructure rounds took $1.25 billion, about 35% of the money, while 15 application and service rounds took $1.64 billion, about 46%. The median round was $50 million, also by our arithmetic.

Business Pill · Power Law Explained

An evergreen Business Engineer explainer on power laws, why a few outcomes take most of the total. It teaches the general idea only and does not discuss these funding rounds.

The key insight: By our count, AI start-ups announced 23 funding rounds worth $3.58 billion from 9 to 11 November in our coverage, led by Mercor’s $750 million Series D. The five largest took about 72% of the money; three infrastructure rounds took about 35%, and 15 application and service rounds about 46%, by our arithmetic.

The Five Largest Rounds

Mercor, which supplies human experts to train and test AI models, said it raised a $750 million Series D at a $20 billion valuation. London chip start-up Fractile raised $720 million at a $7 billion valuation, the Financial Times reported, citing people familiar with the matter; the UK government said the Series C was worth over £500 million.

Energy-storage start-up Torus raised a $500 million Series C led by Magnetar, Bloomberg reported, citing a Torus statement. Dutch defence start-up Onodrim raised $300 million at a $1.3 billion valuation, according to the FT as relayed by IPO Newsroom, and Path Robotics raised a $300 million Series E at a $2.45 billion post-money valuation, led by Georgian.

Together the five come to $2.57 billion, about 72% of the total, by our arithmetic.

The 23 AI funding rounds announced 9 to 11 November 2026 that FourWeekMBA covered, $3.58 billion in total: sha
The 23 AI funding rounds announced 9 to 11 November 2026 that FourWeekMBA covered, $3.58 billion in total: share of dollars and share of rounds by category. Amounts are from company releases and outlet reports in our pieces; categories and shares are our arithmetic.

Infrastructure Against Applications

The infrastructure money went to two chip companies and one energy company: Fractile, Torus and Tendrils, a Cambridge chip start-up that raised $30 million in a round led by Benchmark. Fractile and Torus alone are $1.22 billion.

Applications and services had the most rounds. Nominal announced a $240 million Series C at a $3 billion valuation; Blue J raised US$176 million, of which nearly US$100 million will buy shares from employees and early investors, The Globe and Mail reported; and Rox announced a $100 million Series B at a $1.3 billion valuation.

Robotics and physical AI took about 10%, through Path Robotics, Mosaic Intelligence Labs ($47 million seed) and Akara ($5.5 million). Graphon Labs’ $35 million Series A was the only AI-lab round in the set.

Three Days Against Last Week

Eight of the 23 rounds were $100 million or more, and they total $3.09 billion, by our arithmetic. In our count for 1 to 7 November, eight rounds of that size totalled $3.32 billion. Three days have matched last week’s count and reached about 93% of its dollars.

Last week infrastructure took about 42% of the $100 million-plus total. This week Fractile and Torus are about 40% of it, by our arithmetic.

The Structural Read

As we read the count, the money is concentrated while the deal flow is spread: five rounds took about 72% of the dollars, and the median round was $50 million.

As we read the split, a few large cheques went to the bottom of the stack, chips and power, while most rounds went to applications; Fractile and Torus alone raised $1.22 billion.

Mercor, company release, 10 November 2026, as quoted in our piece

“raised a $750 million Series D at a $20 billion valuation”

Three Implications

FOR FOUNDERS The median round in the set was $50 million, and 15 of the 23 rounds went to applications and services, by our count.

FOR INVESTORS Eight rounds of $100 million or more total $3.09 billion, about 93% of the $3.32 billion we counted for all of 1 to 7 November, by our arithmetic.

FOR INFRASTRUCTURE Three infrastructure rounds, Fractile, Torus and Tendrils, raised $1.25 billion, about 35% of the total, by our arithmetic.

The Business Engineer Lens

This story maps onto the Business Engineer framework The Nine Layers of AI.

The analysis says: “This entire ecosystem has been shaped by constraints, bottlenecks, chokepoints, and scarcity at every layer.”

As we read it, this week’s largest infrastructure cheques went to a chip maker and a power-and-compute product, two of those constrained layers. The analysis does not discuss these funding rounds.

What Is Not Established

The count covers only rounds we reported, so it is not a census of AI funding. Several amounts are reported rather than announced: Fractile’s $720 million and Onodrim’s $300 million come from the FT, Blue J’s from The Globe and Mail. We counted Clara’s $65 million Series C equity without its $40 million facility renewal, Bay’s $50 million raised at emergence, and Alta’s $47.5 million Series A rather than its $80 million total.

We left out Mavria, which says it has raised $130 million to date while its Form D shows $75 million sold, Nvidia’s investment in Point2, which had no amount, and Anthropic’s $26 billion placement, which is tied to its IPO. The week is not over.

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Business Engineer Framework

The Nine Layers of AI

The Business Engineer map of the AI stack, layer by layer, and where the constraints sit.

Read the Map of AI →

The Bottom Line

From 9 to 11 November, AI start-ups in our coverage announced 23 rounds worth $3.58 billion, led by Mercor’s $750 million. Five rounds took about 72% of the money, three infrastructure rounds took about 35%, and the eight $100 million-plus rounds already total about 93% of last week’s, by our arithmetic.

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A note on sourcing. This count is built from FourWeekMBA’s own published pieces on each round from 9 to 11 November 2026 and our AI landscape dataset, which record the company release or outlet report behind each figure; each round links to its piece. Totals, the median, category shares and the comparison with our 1-7 November count are our arithmetic, and the categories are our own grouping. The companies were not contacted for this piece.

Sources: Mercor round (our piece) · Fractile round (our piece) · Torus round (our piece) · Onodrim round (our piece) · Path Robotics round (our piece) · 1-7 Nov $100M+ rounds (our piece)

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