The notes carry a 0.25% interest rate and mature on Nov. 1, 2031, according to a filing Friday with the Securities and Exchange Commission.

About $541.4 million of the new notes were issued in exchange for approximately $456.8 million of Repligen’s existing 1% notes due in 2028. The remaining notes were issued for about $458.6 million in cash.

Repligen said it has about $143.2 million of the 2028 notes outstanding after the transaction.