Decker Retirement Planning Inc. grew its holdings in shares of Marathon Petroleum by 1,621.4% in the first quarter. Decker Retirement Planning Inc. now owns 241 shares of the oil and gas company's stock valued at $35,000 after acquiring an additional 227 shares in the last quarter. Finally, Barnes Dennig Private Wealth Management LLC bought a new position in shares of Marathon Petroleum in the first quarter valued at approximately $35,000. 76.77% of the stock is owned by institutional investors.