Apple; Getty Images; Chelsea Jia Feng/BI
- Apple stock plunged as much as 11% on Monday on news that Berkshire Hathaway sold about 50% of its stake.
- Warren Buffett's conglomerate sold about 390 million Apple shares in the second quarter.
- Berkshire's cash pile hit a record $277 billion, raising concerns about Buffett's market outlook.
Apple stock plunged as much as 11% on Monday, leading the tech rout lower amid a global stock market panic.
The decline in Apple shares...