Martha Stewart, who completed a five-month prison sentence a year ago for lying about her sale of ImClone stock, has decided to fight rather than settle civil insider trading charges brought by the U.S. Securities and Exchange Commission.

In an 11-page response to the SEC complaint filed late Thursday with the U.S. District Court for the Southern District of New York, Stewart denied allegations that she used nonpublic information when she sold 3,928 shares of ImClone Systems Inc. stock in December 2001. Instead, she said she “acted in good faith.”