Gossamer Bio Completes 1-for-80 Reverse Stock Split to Satisfy Nasdaq Rules

Gossamer Bio has completed a 1-for-80 reverse stock split. This action consolidates its share count and raises its trading price to align with Nasdaq listing requirements. The consolidation became effective at 11:59 p.m. ET on September 10, 2026, and shares began trading on a split-adjusted basis on September 11.

Addressing Nasdaq Listing Standards

The reverse split aims to regain compliance with the Nasdaq minimum bid price rule. This rule requires listed securities to maintain a closing price of at least $1.00 per share. According to a company filing with the SEC, Gossamer Bio must sustain this price for 10 consecutive business days before an October 5, 2026, deadline to avoid delisting.

As of September 14, 2026, Gossamer Bio (GOSS) was trading at $10.91 per share.

Impact on Capital Structure

The reverse split also changed the company's authorized capital structure. The total number of authorized common shares fell from 4 billion to 50 million. The total authorized capital stock decreased from 4.07 billion to 120 million shares.

This change required adjustments to financial obligations and incentive programs. The conversion rates for outstanding convertible notes, specifically the 5.00% notes due 2027 and the 7.50% notes due 2030, were updated to reflect the 1-for-80 ratio. The company applied similar proportional adjustments to all outstanding warrants and equity-based awards held by employees and directors.

What the Split Means for Shareholders

A reverse stock split is a mechanical process. It reduces the number of shares outstanding while proportionally increasing the price per share. It does not change the fundamental market capitalization of the firm or the percentage of ownership held by existing shareholders. For investors, the move is a defensive measure to preserve the company's access to public capital markets by maintaining its eligibility for exchange trading. The success of this effort depends on the stock's ability to maintain the required price threshold through early October.