QQQX's strong recent run -- outpacing the broader S&P 500 by roughly 7 percentage points -- is precisely the kind of performance that prompts institutional managers to rebalance. Profit-taking after a rally is one of the most common reasons institutional investors trim positions, and it keeps portfolio weightings in check without signaling a fundamental change in outlook.At first glance, a nearly $5 million sale from a position that's up 32% over the past year might look like a red flag -- but context, as a ...