Rick Wilking/Reuters
- Warren Buffett doesn't seem rattled by recent bank failures and mounting fears of a market meltdown.
- Buffett's company invested about $467 million in Occidental this week, raising its stake to 23.1%.
- Berkshire Hathaway has piled more than $11 billion into the energy giant in just over 12 months.
A trio of bank failures last week may be fanning fears of market meltdowns and financial crises, but that hasn't stopped Warren Buffett from buying stocks.