Olema Pharmaceuticals (OLMA) Soars Over 200% After Roche Breast Cancer Trial Win — What It Means for Palazestrant and Investors on November 18, 2025
Olema Pharmaceuticals shares surged as much as 220% in pre-market trading on November 18 after Roche announced a Phase 3 win for its oral SERD giredestrant in early-stage breast cancer. The spike was driven by investor read-through to Olema’s similar drug palazestrant, not new Olema data. Volume hit 13.4 million shares, far above average. Shares later retreated toward the low-$20s during regular trading.