Berkshire Hathaway Inc (BRK.A)

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If you were Buffett/Munger running one of the world's most efficient businesses -- with only 25 employees in the HQ office -- would you want the office phone ringing all day with small time day traders asking about splits and trivial press events to pop the stock a few pennies????

99.9% of SH questions can be answered in minutes by skimming the 10K and other filings. Same thing about the famous SHM held every year around May 1.