Unsurprisingly, the options pits are seeing ample activity. So far 377,000 calls and 121,000 puts have been exchanged so far, 6 times the average daily pace. Most popular are the expiring August 300, 305, and 310 calls, where new positions are being opened.

Beaten-down UNH is set to challenge its 50-day moving average after a major vote of confidence from the Oracle of Omaha.

This investment signifies Buffett's re-entry into UNH after liquidating his entire position back in 2010, indicating that he perceives significant value at