Shares of Apple rose 3.7 percent Monday after Warren Buffett's Berkshire Hathaway revealed a more than 1 billion dollar investment into the tech giant.

The investment was made in the first quarter, before Apple reported its first quarterly revenue decline in 13 years. The investment was announced amid bearish views from investors. But Berkshire seems to like Apple's strong balance sheet and management.

Berkshire held 1.07 billion dollar worth of Apple shares as of March 31, but the value has since fallen to about 921 million USD even with Monday's gain. Berkshire's largest technology bet has been Buffett's 12 billion dollar investment in IBM, which is now sitting in the red.