Berkshire Shares Run Into Resistance

(Berkshire Hathaway story updated with closing price and volume of Berkshire Hathaway shares)

OMAHA, Neb. (TheStreet) -- At least for a day, the run-up in shares of Berkshire Hathaway(BRK.B) has run into resistance.

The Warren Buffett investment company B shares were down 1.3% at the close on Monday, after closing at a new high last Friday. What's more, in marked contrast to last week, when Berkshire Hathaway stock was trading up on several days when the broad markets were down, on Monday Berkshire Hathaway's shares declined by more than 1% on a day when the DJIA, S&P 500 and financial sector were all up more than 1%.

More retail investors than ever before are paying mind to Warren Buffett's Berkshire Hathaway stock. This big news of January was the 50-to-1 stock split in the B shares, bringing the Berkshire Hathaway price to the range of $70 -- as well as leading to inclusion in the S&P 500 Index. Both of these events compounded the trading frenzy in Berkshire Hathaway shares, and led to an increase in share price of just over $5 last week.

Last Friday, Berkshire Hathaway closed at $76.43, a new 52-week high. Of course, Berkshire Hathaway set a new 52-week high three times in January, and one of the questions for the masses of retail investors now is whether the Warren Buffett stock is already fairly valued, or still has room to move up.

It is really a brand new world of trading in Berkshire Hathaway, with its post-stock split level of liquidity -- more than 13 million shares of Berkshire Hathaway were traded on Monday, eclipsing its 4.5 million share average daily volume. Though to be honest, Berkshire Hathaway has achieved a ever-higher average daily volume of shares traded almost every day so far since the stock split.