UnitedHealth Group Inc. has filed a preliminary prospectus related to the sale of an undisclosed amount of floating-rate notes and four series of fixed-rate notes.

The company plans to use the net proceeds from any offering for general corporate purposes, which may include redeeming or repurchasing outstanding securities or refinancing commercial paper or other debt.

As of March 31, UnitedHealth Group had about $4.4 billion of commercial paper outstanding, with a weighted average annual interest rate of 2.0%.

Bank of America Merrill Lynch, Barclays, Goldman Sachs & Co. LLC, Morgan Stanley and RBC Capital Markets are serving as joint book-running managers for the offering.