AtriCure Inc. (NSDQ:ATRC) filed a mixed shelf offering with the U.S. Securities and Exchange Commission to sell up to $50 million through a combination of debt securities, common stock, preferred stock, warrants, depositary shares and units.

The Cincinnati-area cardiac surgical device maker has also filed rights to sell up to an additional 3,184,535 shares of common stock from time to time.

ATRC stock was trading at $12.91 in the afternoon today, nearly flat with yesterday’s close at $12.90.

The aggregate market value of the company’s outstanding voting commons tock held by non-affiliates was at $142.5 million, based on a June 27 closing value, the company said in the SEC filing.