I sold a few BRK-B shares and used the proceeds to buy a few IBM shares. These were BRK-B shares picked up when BRK bought BNSF. According to my (current) estimation, IBM presents a greater value over BRK (at this time). Buys and sells in tax advantaged accounts.
BRK now is only 6.7% of my stock portfolio. IBM is now 20.3% of my stock portfolio. I hope this goes the way I think it is going to go over the next 5 to 10 years.
As of close (April 19, 2013):
IBM: $190.00/Share, Dividend = $3.40/Share, 20.3 % of Portfolio
BRK-B: $105.28, Dividend = $0.00/Share, 6.7 % of Portfolio