Sumitomo and wholly owned unit Sumitovant Biopharma hold about 52% of Myovant's outstanding stock and agreed to buy the rest for $27 per share, valuing the U.S drugmaker at about $2.59 billion, the companies said in a statement.

Myovant had rejected Sumitomo's previous proposal to acquire the remaining shares for $22.75 each, saying the bid significantly undervalued the company.

The new offer of $27 per share represents a premium of over 11% to Myovant's last close.

Sumitomo Pharma in 2019 agreed to pay $3 billion for a 10% stake in Swiss drugmaker Roivant Sciences Ltd and controlling interest in Myovant. The deal gave the Japanese company a drug pipeline for treatments of prostate cancer, urinary diseases, pediatric illnesses, and respiratory ailments.

Sumitomo's shares were up 0.2% during Monday trading in Tokyo, versus a 0.6% advance in the benchmark Nikkei average.

(Reporting by Ann Maria Shibu in Bengaluru, Rocky Swift in Tokyo; Editing by Shailesh Kuber)