Gossamer Bio is trading 6.89% up at $11.10, with no clearly reported company-specific catalyst identified for September 16, 2026.
- The 1-for-80 reverse stock split became effective September 10.
- The company has planned a September seralutinib NDA submission.
- The move appears more consistent with post-split volatility and speculative trading than the broader biotech sector, which is down 2.11%; available evidence does not establish a definitive cause.