FGS Global handles Arm Holdings, the British semiconductor design company, that filed for an IPO on Aug. 21.

The filing values Arm at $64B, which would be the biggest IPO since Rivian electric vehicle maker’s $70B listing two years ago.

Nvidia offered to buy Cambridge-based Arm 18 months ago for $40B but the Federal Trade Commission sued to thwart the deal. Japan’s Softbank Group bought Arm for $32B in 2016.

Arm reported $2.7B in revenues and $524M profit for the fiscal year ended March. China accounts for about 25 percent of the company’s revenues.

Arm’s designs are used in 99 percent of the world’s smartphones, according to the prospectus.

The company’s stock will trade on the NASDAQ.