Trade Summary

Yesterday, Arch Venture Partners Xii, LLC, serving as 10% owner at Seaport Therapeutics, Inc. (SPTX), purchased 1,100,000 shares at $18.00 per share, for a total transaction value of $19,800,000.00. Following this transaction, Arch Venture Partners Xii, LLC now holds 6,294,951 shares of SPTX.

This purchase represents a 21.00% increase in Arch Venture Partners Xii, LLC's stake in the company. This is considered a high-conviction trade given the significant change in ownership.

The trade was executed on Monday, May 4, 2026 and publicly disclosed via SEC Form 4 filing on Monday, May 4, 2026, meaning the disclosure happened on the same day as the trade.

Seaport Therapeutics, Inc. operates in the HEALTHCARE sector, specifically within the BIOTECHNOLOGY industry. Insider buying activity in this sector can provide valuable signals about industry trends and company-specific developments.