Warren Buffett acquired 265M Occidental Petroleum shares worth $15.8B. That's 4.38% of their equity portfolio (8th largest holding). The investor owns 25.99% of the outstanding Occidental Petroleum stock. The first Occidental Petroleum trade was made in Q3 2019. Since then Warren Buffett bought shares 35 more times and sold shares on two occasions. The stake costed the investor $14.4B, netting the investor a gain of 10% so far.