Why ExxonMobil, Occidental Petroleum, and Phillips 66 Stocks Just Dropped

It's Friday morning -- two days after the Federal Reserve raised interest rates 0.75%, and one day after seemingly every other central bank in the world followed suit, according to The Wall Street Journal -- and oil stocks are tanking. As of 9:50 a.m. ET, shares of oil company Occidental Petroleum (NYSE: OXY) are down 5.6%, while industry bellwether ExxonMobil (NYSE: XOM) is down a solid 6%, and refiner Phillips 66 (NYSE: PSX) is leading the pack lower with a 6.7% loss.