In what would be Japan's biggest IPO this year, PHC will offer up to 53.4 million shares, including an overallotment in the event of exceptional demand, a filing with the Ministry of Finance showed on Tuesday.

At PHC's indicative price of 3,700 yen per share, the company will have a market value of 452 billion yen ($4.1 billion), Reuters calculations showed.

U.S. private equity firm KKR & Co bought the former Panasonic Corp healthcare unit in a $1.67 billion carve-out deal in 2014, when the Japanese electronics conglomerate overhauled its business.

KKR currently owns 45.77% of PHC, Japanese trading house Mitsui & Co Ltd owns 20.17% and Panasonic 10.79%.

PHC, with a global workforce of over 9,700, reported revenue of $2.8 billion in the year ended in March.

The company last year ramped up production of ultra-low temperature (ULT) freezers to meet an estimated 50% surge in demand globally as health authorities prepared to handle storage of delicate mRNA vaccines for COVID-19.

($1 = 110.3000 yen)

(Reporting by Makiko Yamazaki and Rocky Swift; Editing by Susan Fenton and Christopher Cushing)