Earlier quoted context omitted.
Morgan Stanley, Fidelity, Vanguard, Jennison Associates, and Blackrock need a stronger Twitter. [1] Also interesting to note that over the past year insiders have only bought 1.5m shares while offloading 12.5m. [1] http://www.nasdaq.com/symbol/twtr/ownership-summary
All of the above companies are asset managers, not principal investors (even MS in this context). Meaning that they don't benefit from a stronger Twitter, but the individual investors and pension accounts who own their ETFs and index funds do. You might have a point if rich people's investment vehicles (like hedge funds, private equity or venture funds) owned the majority of TWTR - but they don't, as you showed.
And what happens if those asset managers lose money year after year or don't keep up with others?