Market Folly submits:Due to activity on June 17th, 2010, Balyasny Asset Management has disclosed an updated stake in InterMune (ITMN). Dmitry Balyasny's hedge fund firm now shows a 5.49% ownership stake in ITMN with 3,040,200 shares. This is a massive increase in the hedge fund's position size because back on March 31st, 2010, Balyasny owned only 350,000 shares of InterMune. This means that somewhere over the course of the past three months, Balyasny has added 2,690,200 additional shares (over a 768% increase in its position size). It's impossible for us to know when exactly Balyasny Asset Management purchased its shares. This information becomes crucial, however, when you consider that InterMune precipitously dropped from $45 to around $12 back in early May. This huge decline was mainly due to InterMune's failure to receive FDA approval for one of its lung drugs. This is a stock we've seen owned by some other prominent hedge funds in our coverage. Back in early April, we noted Steven Cohen's SAC Capital disclosed an ITMN position. And previously, we detailed how Andreas Halvorsen's Viking Global started a new position in InterMune back in the first quarter.Complete Story »