"Warren Buffett must REALLY, really like Bank of_America stock because he needs to promptly disclose any new purchases by (BRKA) Usually, Buffett, Berkshire's CEO, prefers to keep the company's buying and selling as quiet as possible so as not to tip off other investors about what he's doing. But as a holder of more than 10% of (BAC) (ticker: BAC), Berkshire is required under Securities and Exchange Commission rules to disclose transactions within two business days. Normally, Berkshire's stock purchases and sales—and those of other institutional investors -- are disclosed 45 days after the quarter ends."
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