Gossamer Bio Executes 80-for-1 Reverse Stock Split to Boost Share Price

Key Facts

1Gossamer Bio executed an 80-for-1 reverse stock split to consolidate outstanding shares and increase the price per share.

2The reverse split became effective late September 10, 2026, with shares trading on a split-adjusted basis on September 11.

In a move reflecting the efforts of biotech firms to maintain exchange listing requirements, Gossamer Bio has executed a massive 80-for-1 reverse stock split. According to reports, the consolidation became effective late September 10, 2026, aimed at reducing the number of outstanding shares to boost the per-share trading price. Trading for GOSS on a split-adjusted basis commenced on September 11 following board approval and the filing of a Certificate of Amendment.

This corporate action comes at a critical juncture, as data shows the stock declined 4.23% on its first day of adjusted trading, moving within a session range of $10.57 to $12.52. Per market data, the company's market capitalization stands at approximately $5.33 billion with a daily trading volume of about 139,079 shares. Reverse splits of this magnitude are often interpreted by the market as a defensive measure to sustain listing minimums amid price distress.

Regarding price action, GOSS closed at $0.1424 on September 10, 2026 (pre-split snapshot). On a split-adjusted basis, the stock has seen a 52-week high of $309.60 and a low of $9.10. Investors will be watching for price stabilization at these new nominal levels, though the upcoming economic calendar shows no major sector-specific catalysts or direct company events scheduled for the next seven days.