Reviewed quarterly. They give themselves some wiggle room for moving in and out of positions.."approximates" is the key word.
I make the assumption that if a QQQ company..the lowest ranked and therefore the lowest % represented, is exchanged for another, that 'other' would approximate the %representation of the one taken off the QQQ..therefore not changing the value of the QQQ by a great amount.
The Nasdaq Composite makeup, can change daily...and has some very shaky dogs on it..so, I make the generalization that the Nas Comp 'should' drop by a greater percentage than the QQQ in a free fall market...however, as they eliminate the worst, that should make the 'value' of the remainder that much better....so there are really two diametrically opposed things happening....any other thoughts welcomed.
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