BioCryst Receives Early Termination of HSR Waiting Period for Astria Acquisition
Rhea-AI Summary
BioCryst (Nasdaq: BCRX) announced early termination of the Hart-Scott-Rodino (HSR) waiting period for its proposed acquisition of Astria Therapeutics.
Termination of the HSR waiting period satisfies one regulatory condition for the Merger. BioCryst expects the Merger to close in Q1 2026, subject to other customary closing conditions.
Positive
- HSR waiting period terminated early, clearing a regulatory step
- BioCryst expects the Merger to close in Q1 2026
Negative
- Closing remains subject to other customary conditions, so timing is not guaranteed
News Market Reaction – BCRX
In the Dec 3 session, BCRX gained 9.64%, reflecting a notable positive market reaction. Argus tracked a peak move of +15.4% during that session. Our momentum scanner triggered 16 alerts that day, indicating notable trading interest and price volatility. Trading volume was above average at 1.6x the daily average, suggesting increased trading activity.
Data tracked by StockTitan Argus on the day of publication.
Key Figures
Historical Context
| Date | Event | Sentiment | 24h Move | Catalyst |
|---|---|---|---|---|
| Dec 04 | Inducement grants | Neutral | +0.1% | Equity inducement awards totaling 103,500 shares for four new hires. |
| Dec 03 | Acquisition progress | Positive | +9.6% | Early termination of HSR waiting period for Astria acquisition. |
| Nov 12 | Earnings & deal | Positive | -0.7% | Astria Q3 results plus detailed BioCryst cash‑and‑stock offer terms. |
| Nov 06 | Clinical data | Positive | -1.9% | New pediatric ORLADEYO data and FDA review timing update. |
| Nov 05 | Inducement grants | Neutral | +6.1% | RSU inducement grants for three new employees under Nasdaq rules. |
24h Move is the share-price change in the day after each event; other market factors may also have contributed.
Acquisition-related headlines have produced volatile but mixed reactions: the initial Astria deal announcement moved the stock down, while today’s HSR clearance headline was followed by a strong gain.
Over the last two months, BioCryst has combined steady corporate activity with transformational M&A. An October 8-K detailed the Astria cash‑and‑stock acquisition, followed by Q3 10-Q results showing revenue growth and positive net income. Subsequent news covered inducement equity grants and new HAE data for ORLADEYO. The current HSR early-termination update advances closing of the Astria deal expected in Q1 2026, building on the earlier merger announcement and regulatory filings.
Key Terms
hsr act regulatory
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RESEARCH TRIANGLE PARK, N.C., Dec. 03, 2025 (GLOBE NEWSWIRE) -- BioCryst Pharmaceuticals, Inc. (Nasdaq: BCRX) today announced that it has received early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Act”), with respect to BioCryst’s proposed acquisition of Astria Therapeutics, Inc. (the “Merger”).
Termination of the waiting period under the HSR Act satisfied one of the conditions for consummation of the Merger. BioCryst expects the Merger to close in the first quarter of 2026, subject to other customary closing conditions.
About BioCryst Pharmaceuticals
BioCryst is a global biotechnology company focused on developing and commercializing medicines for hereditary angioedema (“HAE”) and other rare diseases, driven by its deep commitment to improving the lives of people living with these conditions. BioCryst has commercialized ORLADEYO® (berotralstat), the first oral, once-daily plasma kallikrein inhibitor, and is advancing a pipeline of potential first-in-class or best-in-class oral small-molecule and injectable protein therapeutics for a range of rare diseases. For more information, please visit www.biocryst.com or follow us on LinkedIn.
Cautionary Statement Regarding Forward-Looking Statements
Statements included in this document which are not historical in nature or do not relate to current facts are intended to be, and are hereby identified as, forward-looking statements for purposes of the safe harbor provided by Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements are based on, among other things, BioCryst management’s beliefs, assumptions, current expectations, estimates and projections about the economy and BioCryst and Astria and the industry in which they operate. Words and phrases such as “may,” “approximately,” “continue,” “should,” “expects,” “projects,” “anticipates,” “is likely,” “look ahead,” “look forward,” “believes,” “will,” “intends,” “estimates,” “strategy,” “plan,” “could,” “potential,” “possible” and variations of such words and similar expressions are intended to identify such forward-looking statements. Forward-looking statements include statements regarding, among other things, the anticipated timing of the closing of the Merger and BioCryst’s and Astria’s plans, objectives, expectations, intentions, growth strategies and other statements that are not historical facts. BioCryst cautions readers that forward-looking statements are subject to certain risks and uncertainties that are difficult to predict with regard to, among other things, timing, extent, likelihood and degree of occurrence, which could cause actual results to differ materially from anticipated results. Such risks and uncertainties include, among others, the following possibilities: the occurrence of any event, change or other circumstances that could give rise to the right of one or both of the parties to terminate the definitive agreement governing the Merger (the “Merger Agreement”); the outcome of any legal proceedings that may be instituted against BioCryst or Astria; the failure to obtain Astria stockholder approval or to satisfy any of the other conditions to the Merger on a timely basis or at all; the possibility that the anticipated benefits of the Merger, including anticipated synergies, are not realized when expected or at all, including as a result of the impact of, or problems arising from, the integration of the two companies or as a result of the strength of the economy and competitive factors in the areas where BioCryst and Astria do business; the significant indebtedness BioCryst expects to incur in connection with the Merger and the need to generate sufficient cash flows to service and repay such debt; the possibility that the Merger may be more expensive to complete than anticipated; diversion of management’s attention from ongoing business operations and opportunities; potential adverse reactions or changes to business or employee relationships, including those resulting from the announcement or completion of the Merger; risks relating to the potential dilutive effect of shares of BioCryst common stock to be issued in the Merger; and other factors that may affect future results of BioCryst, Astria and the combined company. Additional factors that could cause results to differ materially from those described above can be found in BioCryst’s Annual Report on Form 10-K for the year ended December 31, 2024, BioCryst’s Quarterly Report on Form 10-Q for the three months ended September 30, 2025, Astria’s Annual Report on Form 10-K for the year ended December 31, 2024, Astria’s Quarterly Report on Form 10-Q for the three months ended September 30, 2025, and in other documents BioCryst and Astria file with the SEC, which are available on the SEC’s website at www.sec.gov.
Important Additional Information and Where to Find It
In connection with the Merger, BioCryst has filed with the SEC a registration statement on Form S-4 (the “registration statement”), which contains a preliminary proxy statement of Astria and a preliminary prospectus of BioCryst (the “proxy statement/prospectus”), and each of BioCryst and Astria may file with the SEC other relevant documents regarding the Merger. The registration statement has not yet become effective. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT AND THE PROXY STATEMENT/PROSPECTUS CAREFULLY AND IN THEIR ENTIRETY AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC BY BIOCRYST AND ASTRIA, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS WHEN THEY BECOME AVAILABLE BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT BIOCRYST, ASTRIA AND THE MERGER. When final, a definitive copy of the proxy statement/prospectus will be mailed to Astria stockholders. Investors and security holders are able to obtain the registration statement and the proxy statement/prospectus, as well as other filings containing information about BioCryst and Astria, free of charge from BioCryst or Astria or from the SEC’s website. The documents filed by BioCryst with the SEC may be obtained free of charge at BioCryst’s website, at www.biocryst.com, or by requesting them by mail at BioCryst Pharmaceuticals, Inc., 4505 Emperor Boulevard, Suite 200, Durham, North Carolina 27703, Attention: Corporate Secretary. The documents filed by Astria with the SEC may be obtained free of charge at Astria’s website, at www.astriatx.com, or by requesting them by mail at Astria Therapeutics, Inc., 22 Boston Wharf Road, 10th Floor, Boston, Massachusetts, 02210, Attention: Investor Relations. The information included on BioCryst’s and Astria’s websites is not incorporated by reference into this document.
Participants in the Solicitation
BioCryst and Astria and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from the stockholders of Astria in respect of the Merger. Information about BioCryst’s directors and executive officers is available in BioCryst’s proxy statement, dated April 24, 2025, for its 2025 Annual Meeting of Stockholders, and other documents filed by BioCryst with the SEC. Information about Astria’s directors and executive officers is available in Astria’s proxy statement, dated April 28, 2025, for its 2025 Annual Meeting of Stockholders, and other documents filed by Astria with the SEC. Other information regarding the persons who may, under the rules of the SEC, be deemed participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, is contained in the proxy statement/prospectus. Investors should read the proxy statement/prospectus carefully when it becomes available before making any voting or investment decisions. You may obtain free copies of these documents from BioCryst or Astria as indicated above.
No Offer or Solicitation
This document is not intended to and shall not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act.
BCRXW
Contact:
Investors:
investorrelations@biocryst.com
Media:
media@biocryst.com
