The trade has nothing to do with the manager's view. It is presentational, driven by the fact that clients see a list of holdings at quarter end and rarely see when each was bought.
The resulting flows can push strong stocks a little higher and weak stocks a little lower into quarter end, with some tendency to reverse afterwards. It is one contributing explanation for the turn-of-the-month-effect.
The effect is small, hard to isolate from ordinary momentum, and less significant than it was before holdings disclosure became more frequent. Know it as a reason why late-quarter flows can look irrational, not as something to trade directly.
Related: turn-of-the-month-effect, seasonality, triple-witching, sector-rotation, distribution