According to a Feb press release, they're fabbed by TSMC:

> For FUJITSU-MONAKA, the 2nm semiconductors will tape out next year. Due to this, Rapidus would be unable to meet the deadline, so TSMC is handling the manufacturing.

Source: https://global.fujitsu/en-global/pr/news/2026/02/12-01?utm_s...

According to Rapidus webpage, they are explicitly starting mass production of their 2nm in 2027.

Source: https://www.rapidus.inc/en/iim/?utm_source=chatgpt.com