Majestic Labs

The problem: the memory wall

Large AI models are limited not only by computing power but mainly by the fast memory available to the chip, a phenomenon known as the memory wall. To run a huge model today, dozens of chips must be connected to each other, mostly to gather enough memory and not because of a real need for more computing power.

Majestic Labs was founded in 2023 by Ofer Shacham (CEO), Sha Rabii (President) and Masumi Reynders (COO). All three previously led Meta Reality Labs' FAST chip team and Google's GChips, and together they hold more than 120 patents. The company came out of stealth in November 2025 to attack this problem at its root.

The solution: a server with about 100 times more memory

According to the company's announcement, a single Majestic server provides fast-memory capacity equal to about 10 of today's advanced server racks: up to 128 terabytes of high-bandwidth memory per server, about 100 times what leading GPU servers offer. This makes it possible to run, on a single machine, workloads that currently require many chips. According to the company, the architecture uses significantly less power and physical space than existing GPU-based solutions. In a 2026 interview with Globes, CEO Ofer Shacham said the server produces 10 to 50 times more tokens per megawatt than is standard in the market.

In 2026 Majestic Labs unveiled the first product built on the architecture, a server called Prometheus, which the company says was designed specifically to break through the memory wall.

Funding and investors

The company came out of stealth with more than $100 million, in two rounds: a seed round led by Lux Capital, and a Series A led by Bow Wave Capital, with participation from other investors such as SBI, Upfront, Grove Ventures, Hetz Ventures and TAL Ventures. The company is headquartered in San Francisco and Tel Aviv.

Reliable sources disagree on the exact split between the two rounds. According to CNBC and SiliconANGLE, two outlets that reported directly from the founders, the Series A was $71 million. According to Calcalist (CTech), however, the split was $10 million in the seed round (2024) and $90 million in the Series A. The company's official Business Wire release gives only the total (more than $100 million) without breaking down the two rounds, so the official source cannot settle which of the two reports is more accurate.

In the months after coming out of stealth, Majestic Labs received wide media recognition, including a place on CB Insights' AI 100 list and Primary Venture Partners' Compute 100 list, and coverage in the Wall Street Journal, Fortune and CNBC. This reflects the high level of interest in the field, even if the company's business claims have not yet faced a full market test.