Yes, but you’d be foolish to realize your gains if you think the stock still has a long way to run. That just triggers taxes and eliminates any further upside. So, we can reasonably conclude that either BH thinks Amazon’s run is nearly exhausted, or it’s one of the stocks with minimal forward prospects in BH’s portfolio and they want to deploy the capital with something that they feel will have a greater return (maybe Amazon still rises, but whatever else they want to invest in they think will rise more/faster).