Soros disclosed a $325.3 million stake, or 2.9 million shares, in biotech firm Horizon Therapeutics (HZNP.O), which was bought by Amgen (AMGN.O) in December for nearly $28 billion.
The firm also bought 2.8 million shares, valued at $90 million, in home health assessment firm Signify Health (SGFY.N).
It added $209.1 million, or 8.5 million shares, in Memphis-based financial services company First Horizon, which was acquired by Toronto-Dominion Bank (TD.TO) roughly a year ago for $13.4 billion.
Shares in Zoom Technologies Inc (ZTNO.PK) and Airbnb Inc (ABNB.O) were sold, while it reduced its holdings in Amazon.com (AMZN.O), by 54.5%, to 901 million shares.
The regulatory filing also showed Soros bought $255 million in an investment grade corporate bond ETF.