Andreas Halvorsen's hedge fund firm Viking Global has filed a 13G with the SEC regarding its position in Mallinckrodt (MNK). Per the filing, Viking now owns 4.9% of the company with over 5.72 million shares. This is up slightly from the 5.41 million shares they owned at the end of the second quarter. The filing was made due to activity on August 21st. Read more: http://www.marketfolly.com/2015/08/viking-global-boosts-mall...