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Seaport Therapeutics stock pops 17% on Nasdaq debut after raising $255 million in upsized IPO

other · 2026-05-01

Seaport Therapeutics, a Boston-based biotech company, saw its stock rise 17% on its first day of trading on the Nasdaq. The company sold more shares than originally planned at $18 each, raising $255 million in an upsized initial public offering. This gave Seaport a market valuation of $1.1 billion.

Key facts

  • Seaport Therapeutics is a Boston-based biotech company.
  • Its stock rose 17% on Nasdaq debut.
  • The company raised $255 million in an upsized IPO.
  • Shares were priced at $18 each.
  • More shares were sold than originally planned.
  • Market value reached $1.1 billion.
  • IPO was upsized.
  • Trading debut was on Nasdaq.

Entities

Institutions

  • Seaport Therapeutics
  • Nasdaq

Locations

  • Boston
  • United States

Sources