Gossamer Bio’s board of directors approved a 1-for-80 reverse stock split of its common stock. The company intends to increase its per-share trading price to regain compliance with the Nasdaq Global Select Market’s minimum bid price requirement.

The reverse split becomes effective after the market close on September 10, 2026. Common stock will begin trading on a split-adjusted basis at the market open on September 11, 2026.

The company’s stock continues to trade under the ticker symbol GOSS with a new CUSIP number. Stockholders previously granted approval for this action at a special meeting on July 14, 2026.