Calamos Advisors LLC lowered its stake in Marathon Petroleum Corporation (NYSE:MPC – Free Report) by 6.8% during the 4th quarter, according to the company in its most recent disclosure with the Securities and Exchange Commission. The firm owned 313,204 shares of the oil and gas company's stock after selling 23,002 shares during the period. Calamos Advisors LLC owned approximately 0.10% of Marathon Petroleum worth $50,936,000 as of its most recent SEC filing. Get Marathon Petroleum alerts: Other hedge funds ...