- Tendrils has raised $30m, led by Benchmark, to build a general-purpose processor with thousands of parallel cores.
- The UK Sovereign AI Fund and the Visionaries Club have both joined the round, and Jack Altman of Benchmark now sits on the board.
- Tendrils is also working on Vine, an open-source programming language for parallel-first chips.
Modern CPUs still rely on design decisions from the 1970s. Tendrils, a Cambridge-based startup founded in 2026, wants to move beyond that and has raised $30 million, led by Benchmark, to build a general-purpose processor with thousands of parallel cores.
Jack Altman, Benchmark’s general partner and former CEO of Lattice, is joining the board.
Other investors in the round are the UK Sovereign AI Fund, Visionaries Club, FR8, Antimatter, Cloudberry, Conviction, Embassy Ventures, SV Angels and a number of private investors.
Why Tendrils wants to start over
Tendrils argues that current CPUs are constrained by backwards compatibility with the sequential, single-core architecture. The company points to cache coherency protocols, which keep data state consistent across multiple cores, and reorder buffers, which allow instructions to execute out of order, as the key constraints.
As they put it, the question is “what if we redo the CPU?”
The company want to build a chip from the ground up as a parallel processor. In essence, it is getting rid of shared mutable memory and linear instruction streams.
Tendrils is also working on Vine, an open source programming language for these parallel-first chips. Vine is still very much in the experimental stage and is based on interaction nets, a model in which local rules run in parallel without locking.
The company website lists four team members — Nils Cremer, Hugo McNally, Enrico Borba, and T6t6 — but gives no indication of their roles. Tendrils has not disclosed its founders, headcount, or any funding history.
Who is backing it, and who else is in the race
Tendrils isn’t the only player in this space. AheadComputing, founded in 2024 by four former Intel architects, raised $30 million in January, bringing its total to $53 million, to build CPU cores on the open RISC-V platform. Tech Funding News reported in October that Sequoia-backed Nuvacore is seeking a $2.5 billion valuation without a product.
Benchmark’s prior investments have included Uber and eBay, as well as its 2016 Series A investment in Cerebras. The Sovereign AI Fund, a £500 million government vehicle, received a £120 million top-up in October. The Fund normally invests between £1m and £10m in equity, though the amount of the Fund’s investment in this round is not known.
A small round in a big market
Market estimates vary considerably. Coherent Market Insights see the data centre CPU market growing from $14 billion in 2026 to $26 billion in 2033. AMD and Bank of America Securities are much more optimistic, seeing the server CPU market potentially exceed $120 billion by 2030.
Investors are throwing far more money into other companies. TFN has covered Fractile’s £577 million Series C and Flapping Airplanes’ $1 billion raise at a $6 billion valuation.
The real challenge is getting developers to stop using shared memory and start using a new language. If Tendrils succeeds, then $30 million looks like a very good deal. If it doesn’t, it could be suffering from the same problem as many previous many-core projects: the software simply doesn’t exist.
