The Vanguard Group just filed a "Statement of acquisition of beneficial ownership", which is also known as a 13G. In the filing, it appears as though The Vanguard Group claims to own 10,350,247 shares. This represents 10.41% of Mallinckrodt Plc.
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Other recent filings from the company include the following:
James E. Flynn just provided an update on share ownership of Mallinckrodt Plc - Feb. 14, 2018
T. ROWE PRICE ASSOCIATES, INC. just provided an update on share ownership of Mallinckrodt Plc - Feb. 14, 2018
Statement of acquisition of beneficial ownership by individuals - Feb. 13, 2018
Tender offer statement by Third Party - Feb. 13, 2018
Entry into a Material Definitive - Feb. 13, 2018