Calamos Advisors LLC cut its stake in shares of Valero Energy Co. (NYSE:VLO – Free Report) by 30.6% in the 2nd quarter, Holdings Channel reports. The institutional investor owned 75,908 shares of the oil and gas company’s stock after selling 33,540 shares during the quarter. Calamos Advisors LLC’s holdings in Valero Energy were worth $8,904,000 […]