If I remember correctly he referred to the amount as $50B? So it probably includes a lot of positions where the buying is not his typical buy until it makes a difference for BRK (Apple, BAC, etc) or the position size is as big as it can get given he doesn't want BRK to be a bigger owner (banks other than BAC, airlines, etc).
So my guess is that it refers to several of the smaller positions which are not bought by Ted and Todd like Verizon, Chevron, pharma basket, Japanese basket.