Astronomical profits of American oil giants in the shadow of the war with Iran NBC news reported that two companies, ExxonMobil and Chevron, the largest oil companies in the United States, reported profits beyond analysts' forecasts. According to this report, the sharp rise in global oil prices following the US-Iran war resulted in significant growth in the profitability of these two oil giants. While the war with Iran kept oil prices at high levels, the major American oil companies benefited from the increase in revenues caused by these conditions.