CARLSBAD, Calif. , Sept. 9, 2024 /PRNewswire/ -- Ionis Pharmaceuticals, Inc.

(Nasdaq: IONS ) today announced a proposed underwritten public offering of $500.0 million of its common stock. Ionis intends to grant the underwriters a 30-day option to purchase up to an additional $75.

0 million of shares of its common stock offered in the public offering on the same terms and conditions. Ionis intends to use the net proceeds from the offering to fund its independent commercial launches, late-stage clinical programs, earlier pipeline programs, and research and development activities, as well as for working capital and general corporate purposes. The offering is subject to market and other conditions, and there can be no assurance as to whether or when the offering may be completed, or as to the actual size or terms of the offering.

Morgan Stanley and Goldman Sachs & Co. LLC are acting as joint book-running managers for the offering. A shelf registration statement relating to the offered securities was filed with the Securities and Exchange Commission ("SEC") on November 24, 2023 , and was automatically effective upon filing.

The offering is being made only by means of a written prospectus and a prospectus supplement that form a part of the registration statement. A preliminary prospectus supplement and accompanying prospectus relating to the offering will be filed with the SEC on September 9, 2024 , and will be available for free on the SEC's website, located at www.sec.

gov. Copies .