none of you do your homework do you, and it's so easy to search the entire SEC site for ownership forms for insmed.
in short, Blackrock total holdings (sum of various subsidiaries) was already 1.687M so they bought a few more to (now) 2.122M taken them over 5% - big deal (not)
blackrock have been invested in insmed for years (though I do believe they are one of the key fraudsters in bed with insmed BOD in recent several years). the reason the short data is still high is that such insiders are privy to shares that Insmed will issue later this year (as we have seen over and over again). Fudfighter works for a small-time London hedge fund who were not included in the last/previous dilution scam (hence we was so p'd off). There will be no short squeeze which insmed (and their blackrock/FMR friends) does not plan (and we retail holders have no way of finding out).
anyway, any increase by insty holdings is welcome. the only reason I still hold is that there IS (fact) such a massive insty holding base.
we will test $19, then go back up, breaking $24 soon (esp. if another "analyst" ups their target)
Yahoo had the following for Insmed in terms of BlackRock at October 31, 2013
BlackRock Fund Advisors - 979,585 (2.5%)
BlackRock Institutional Trust - 1,066,088 (2.73)
Based on the 13G the increase would be over 76,000 shares. Where do you see the increase of 4.1 million?