Miram Pharmaceuticals to offer, subject to market conditions and other factors, $600.0 million aggregate principal amount of convertible senior notes due 2032 (the "notes") in a private placement (the "offering") to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the "Securities Act"). Mirum also expects to grant the initial purchasers of the notes an option to purchase, for settlement within a period of 13 days from, and including, the date the notes are first issued, up to an additional $90.0 million aggregate principal amount of notes.

The notes will be senior, unsecured obligations of Mirum and will accrue interest payable semi-annually in arrears. The notes will mature on June 1, 2032, unless earlier converted, redeemed or repurchased. Noteholders will have the right to convert their notes in certain circumstances and during specified periods. Mirum will settle conversions by paying or delivering, as applicable, cash, shares of its common stock or a combination of cash and shares of its common stock, at Mirum's election. The interest rate, initial conversion rate, repurchase or redemption rights and other terms of the notes will be determined at the time of pricing of the offering.