Upstart Holdings Inc. UPST stock is trading lower on Monday.Over the last month, the stock has been down almost 13% as per data from Benzinga Pro.Check the latest UPST price here.On Monday, Upstart said it will offer $500 million of convertible senior notes due 2032 in a private offering.Upstart also expects to grant the initial purchasers of the notes an option to purchase up to an additional $75 million of notes.The notes will be senior, unsecured obligations of Upstart and will bear interest payable semi ...