Arrowhead Pharmaceuticals Inc. filed SEC Form 8-K: Other Events, Financial Statements and Exhibits
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Biotechnology: Pharmaceutical Preparations
Health Care
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(D) OF
THE SECURITIES EXCHANGE ACT OF 1934
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Item 8.01 Other Events
Arrowhead Pharmaceuticals, Inc. (the “Company”) was notified that on September 11, 2025, Ionis Pharmaceuticals, Inc. (“Ionis”) filed a Complaint for Patent Infringement against the Company in the United States District Court for the Central District of California alleging patent infringement of United States Patent No. 9,593,333 (“the ’333 patent”). As the Company previously reported, on September 10, 2025, the Company filed a Complaint for Declaratory Judgment in the United States District Court for the District of Delaware against Ionis to declare that the ’333 patent is invalid and not infringed by the Company’s planned commercialization of investigational plozasiran. A copy of Ionis’s complaint is attached hereto as Exhibit 99.1 (the “Complaint”).
Forward-Looking Statements
This Current Report on Form 8-K contains forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. Any statements contained in this report except for historical information may be deemed to be forward-looking statements. Without limiting the generality of the foregoing, words such as “may,” “will,” “expect,” “believe,” “anticipate,” “hope,” “intend,” “plan,” “project,” “could,” “estimate,” “continue,” “target,” “forecast” or “continue” or the negative of these words or other variations thereof or comparable terminology are intended to identify such forward-looking statements. These forward-looking statements include, but are not limited to, statements about our planned commercialization of investigational plozasiran and beliefs and expectations regarding the Company’s claims and lawsuits against Ionis and the validity and enforceability of the ‘333 Patent. These statements are based upon our current expectations and speak only as of the date hereof. Our actual results or outcomes may differ materially and adversely from those expressed in any forward-looking statements as a result of numerous factors and uncertainties, including the risks and uncertainties described in our most recent Annual Report on Form 10-K, subsequent Quarterly Reports on Form 10-Q and other documents filed with the Securities and Exchange Commission from time to time. We assume no obligation to update or revise forward-looking statements to reflect new events or circumstances.
Item 9.01. Financial Statements and Exhibits.
(d) Exhibits
| Exhibit No. | Description | |||||||
| 99.1 | ||||||||
| 104 | Cover Page Interactive Data File (the cover page tags are embedded within the Inline XBRL document). | |||||||
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
Date: September 12, 2025
| ARROWHEAD PHARMACEUTICALS, INC. | ||||||||
| By: | /s/ Daniel Apel | |||||||
| Daniel Apel | ||||||||
| Chief Financial Officer | ||||||||