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Assembly Biosciences rises as Gilead opts to license co's HSV therapies

ReutersDec 22, 2025 5:27 PM

Shares of biotech firm Assembly Biosciences ASMB.O rise 3.2% to $36.38

ASMB says Gilead Sciences GILD.O has exercised its combined option to exclusively license Assembly's herpes simplex virus programs, including two long-acting experimental drugs for recurrent genital herpes, ABI-1179 and ABI-5366

ABI-1179 and ABI-5366 are long-acting drugs that block an enzyme needed for herpes virus to replicate, aiming to improve chronic treatment for recurrent genital herpes, a chronic viral infection caused by the herpes simplex virus that affects the genital area

Under the terms of the 2023 collaboration agreement, ASMB will receive a $35 million payment from Gilead for exercising the combined HSV program option

Gilead gains exclusive rights and responsibility for further clinical development and commercialization of the therapies

ASMB remains eligible for up to $330 million in regulatory and commercial milestones, as well as tiered royalties on net sales

Including session moves, ASMB has more than doubled YTD

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