Biogen (BIIB, Financial) (83%, 2.43%; 5%, 0.10%), a biotechnology company specializing in therapies for the treatment of neurological diseases, was a strong contributor before we exited the position in the first half. We began acquiring shares in January 2021, paying between 9-11x FCF and a discount to our appraisal, even if the company’s promising drug pipeline turned out to be worth 0. After Biogen’s Alzheimer drug Aduhelm was approved in June, we quickly sold out after the stock’s price appreciated over 70% and briefly exceeded our appraisal of the value. We re-initiated a position in Biogen in December at a price below our original cost basis from January. The stock became very cheap once again after Aduhelm’s early sales disappointed due to its high initial cost before management correctly cut the price. We think Biogen’s core Multiple sclerosis (MS) and Biosimilars businesses are strong enough to create sustainable double-digit EPS growth, even if Aduhelm and the entire Alzheimer’s program is worth zero. We also expect a board led by large shareholders to continue the company’s accretive repurchase, while considering other beneficial corporate actions.
From Mason Hawkins (Trades, Portfolio)' Longleaf Partners Fund fourth-quarter 2021 commentary.
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