Key PointsBerkshire Hathaway bought back $4.5 billion in shares in the second quarter. Berkshire is only allowed to buy back shares when its top leaders agree the stock is cheap.This is Berkshire's first notable buyback activity since early 2024. 10 stocks we like better than Berkshire Hathaway › Berkshire Hathaway (NYSE: BRKA)(NYSE: BRKB) bought back $4.5 billion in stock in the second quarter, its first major buyback activity since early 2024.…