Rigaku, a Japanese manufacturer of X-ray testing tools, made its market debut on the Tokyo Stock Exchange on Friday following an initial public offering (IPO) that raised $863 million. Despite the successful fundraising, Rigaku's shares experienced a significant decline, falling 11% shortly after trading began. This downturn was noted in multiple reports, with early trading reflecting a drop of 4% to 10%. The IPO was priced at the top of the expected range, indicating strong initial interest from investors, although the subsequent trading performance suggests a challenging start for the company in the primary market.