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 10,143,967 shares. This represents 9.58% of Mallinckrodt Plc.
Please note that typos are common in SEC filings. Please verify the information reported above before acting on it.
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Other recent filings from the company include the following:
Mallinckrodt Plc director just picked up 5,601 shares - Sept. 22, 2017
Mallinckrodt Plc director just declared ownership of no shares of Mallinckrodt Plc - Sept. 22, 2017
Mallinckrodt Announces Election Of David Norton TO ITS BOARD OF DIRECTORS - Sept. 20, 2017
Mallinckrodt Plc's Chief Public Affairs Officer just picked up 1,280 shares - Sept. 1, 2017