Shares of Occidental Petroleum (NYSE:OXY) are up 45% year to date (YTD) heading into Tuesday’s open, an impressive performer among large U.S. oil producers in 2026. The question is whether OXY stock is genuinely running away from peers, or simply leading a tight pack. For context, ConocoPhillips (NYSE:COP) stock is up 33% YTD, while Diamondback ... Occidental Petroleum Stock Is Up 45% This Year. Is It Outperforming Other Oil Stocks Like ConocoPhillips and Diamondback Energy?