[rdancer]

If AAPL were interested in selling more shares (their cash reserves growth indicates they don't), they would usually sell the whole bunch of them at once, either to one investment bank, or a consortium (who then resell it on the open market). So yes, Berkshire is buying a lot, so instead of selling to Goldman Sachs, Apple may sell to them.

It all comes down to whether both Apple and Berkshire can agree on a price and cash flow that is better than buying/selling on the open market. This would probably not be a great discount for the buyer. Other companies would probably still ask Goldman to broker the sale (at a lower fee) and take care of regulatory compliance, but both AAPL and BRK like to maintain in-depth knowledge of the intricacies of the stock market in-house, so they may just do everything themselves.