Hedge Fund and Insider Trading News: Andreas Halvorsen, Bill Ackman, Paulson & Co., Merck & Co., Inc. (MRK), Arvinas Inc (ARVN), Y-mAbs Therapeutics (YMAB), and More

Andreas Halvorsen’s Viking Global Investors disclosed Thursday that it holds a 75.6% stake in urologic biopharmaceutical company Urovant Sciences Ltd.

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