Regeneron Pharmaceuticals IncDisappointing trial results for a pipeline drug, missing expected readouts.

Longleaf Partners Fund reported that Regeneron Pharmaceuticals was a detractor in the second quarter of 2026 after disappointing trial results for one of its pipeline drugs. The fund noted that Dupixent, which accounts for over 50% of Regeneron's value, has outgrown expectations, while Eylea, representing less than 15% of the value, has stabilized. Regeneron has achieved one out of three key pipeline readouts since the fund invested, compared to an expected two out of three. The fund trimmed its holding earlier in the year when market optimism was higher and has been encouraged by the company's share repurchases when undervalued and its avoidance of large, value-destructive M&A.
Regeneron Pharmaceuticals IncDisappointing trial results for a pipeline drug, missing expected readouts.