Waltham, Massachusetts-based Spyre Therapeutics, Inc. (NASDAQ: SYRE) has commenced an underwritten public offering of USD 300 million of common stock, with underwriters granted a 30-day option to purchase an additional USD 45 million of shares. The clinical-stage company is focused on antibody engineering for inflammatory bowel disease (IBD) and other immune-mediated diseases.
Jefferies LLC, Goldman Sachs & Co. LLC, Evercore ISI, and Guggenheim Securities, LLC are acting as joint book-running managers, with LifeSci Capital LLC serving as passive bookrunner. The offering follows a USD 316.2 million public offering closed in October 2025, which included full exercise of the underwriters’ overallotment option, and a USD 200 million offering completed in November 2024. The company also raised USD 180 million via a PIPE financing in 2023, shortly after its formation from the rebranding of Aeglea BioTherapeutics.
Spyre’s pipeline consists of investigational extended half-life antibodies targeting α4β7, TL1A, and IL-23 — three mechanisms with established clinical validation in IBD. The antibody candidates, designated SPY001 (α4β7), SPY002 (TL1A), and SPY003 (IL-23), incorporate the YTE Fc modification, a set of amino acid substitutions that enhance binding to the neonatal Fc receptor and extend serum half-life. The company has reported half-lives of approximately 85 days for certain candidates, which the company said could support quarterly or less frequent subcutaneous dosing. The three monotherapy candidates are also being evaluated as pairwise combinations — SPY120, SPY130, and SPY230 — in the company’s SKYLINE Phase II basket trial. This week’s fund raise follows shortly after Spyre announced that SPY001 met its primary endpoint in relation to treating ulcerative colitis.
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