William R Klesse has bought OXY on 10 days since Nov 2016

William R. Klesse (born 1947) is an independent director at Occidental Petroleum Corporation (OXY) since 2013, where he chairs the Environmental, Health & Safety Committee and serves on the Executive Compensation Committee.( As of late 2025, he owns approximately 218,913 shares of OXY stock valued over $9 million and has engaged in recent insider trading activities.(

Klesse had a distinguished 45-year career in the energy sector, starting as a trainee at Diamond Shamrock in 1969 and rising through roles at its successors, Ultramar Diamond Shamrock and Valero Energy.( At Valero, he served as Executive Vice President and COO (2003–2005), President (2008–2013), CEO (2006–2014), and Chairman (2007–2014).( He holds a B.S. in Chemical Engineering from the University of Dayton and an MBA in Finance from West Texas A&M University.( Klesse also serves on boards of non-profits including the University of Dayton and Texas Biomedical Research Institute.(

Written by Perplexity from public sources.