BioCryst Pharmaceuticals plans to buy Astria Therapeutics for around $700 million in cash and stock.
The deal,
announced
Tuesday, means BioCryst will get a drug intended to prevent hereditary angioedema (HAE), an area in which it already specializes.
The Durham, NC-based company will pay $8.55 in cash and 0.59 shares of its common stock per share of Astria stock, implying a value of $13.00 per share or around $700 million in enterprise value for Astria. That is a premium of about 53% over Astria’s closing share price
$ATXS
on Monday.
BioCryst has also arranged a financing facility worth up to $550 million with funds managed by Blackstone. It expects the cash portion of the deal to be funded with cash on hand and part of the Blackstone facility.
BioCryst’s shares
$BCRX
fell as much as 14% premarket and were later down about 9%.
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Astria’s lead candidate is an injected kallikrein inhibitor named navenibart, which is intended to prevent the episodes of severe swelling in the limbs, face, intestinal tract and airway that characterize HAE. The company expects to have topline data from an ongoing Phase 3 study of the drug called ALPHA-ORBIT in early 2027.
Navenibart still has to prove itself effective, but BioCryst believes that the drug’s real advantage is its dosing schedule. The drug can potentially be injected every six or even nine months. The leading product sold to prevent HAE is Takeda’s Takhzyro, which was approved in 2023. It’s an effective medication but must be injected every two weeks.
“The market isn’t looking for more efficacy. What it’s looking for is less burdensome dosing, and that’s what navenibart has the potential to provide,” BioCryst President and Chief Commercial Officer Charlie Gayer said Tuesday on a conference call.
BioCryst also sells an HAE preventive called Orladeyo. The oral plasma kallikrein inhibitor was approved
in 2020
. BioCryst CEO Jon Stonehouse said on the call that Orladeyo was “on its way to $1 billion at peak around the end of the decade.” It had sales of $157 million in the second quarter of 2025.
BioCryst believes that having two products to prevent the same disease makes sense. “Brand-new patients to [prophylaxis] really prefer oral. Patients who are already doing well on an injectable would prefer to have an injectable that even better meets their needs, specifically with dosing,” Gayer said on the call.
BioCryst said its sales infrastructure and expertise in HAE could maximize the reach of navenibart, which it believes could be the best drug in its class alongside having a dosing advantage. If the late-stage trials pan out, it could end up claiming a substantial slice of the roughly 5,000 patients who already take an injected preventive therapy for HAE.
Gayer, who is set to take over as BioCryst’s CEO in January, said the company believes that navenibart and Orladeyo could have combined sales of “at least $1.8 billion by 2033.” BioCryst
sold its European Orladeyo business
in June to pay off debt.
Under the deal, BioCryst will also gain Astria’s program for atopic dermatitis, STAR-0310. But it doesn’t plan to keep the asset. BioCryst said it would seek strategic alternatives for STAR-0310, which is in a Phase 1 trial in healthy volunteers.
Even after absorbing the R&D costs of navenibart, BioCryst will “remain highly profitable on a non-GAAP basis and cash flow positive,” CFO Babar Ghias said on the call.
The company declined to say if there were other bidders for Astria.
When the deal closes, which is expected in the first quarter of next year, Astria CEO Jill Milne will join BioCryst’s board. Milne said the deal was “a compelling outcome for Astria stockholders.” Astria stockholders will own roughly 15% of equity in the combined company.