Boundless Bio and Serapha Bio Announce Merger and $230 Million Private Placement

June 25, 2026

Boundless Bio and Serapha Bio entered into a definitive agreement to merge in an all-stock transaction. Serapha will combine with Boundless Bio, with the combined company expected to operate as Serapha Bio and trade on Nasdaq under ticker AATD, following a pre-closing $230 million private investment led by RA Capital Management and RTW Investments.

Buyers
Serapha Bio, Boundless Bio
Targets
Serapha Bio, Boundless Bio
Industry
Biotechnology
Location
United States
Transaction Type
Buyout

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