Ionis Pharmaceuticals Inc. announced its intention to offer $700 million aggregate principal amount of Convertible Senior Notes due 2030 in a private placement to qualified institutional buyers under Rule 144A. The company may also grant initial purchasers an option to buy up to an additional $70 million principal amount of notes within 13 days of issuance. The notes will be general unsecured obligations, with interest payable semiannually in arrears. Upon conversion, Ionis may pay in cash, shares of its common stock, or a combination of both. The interest rate, initial conversion rate, and other specific terms will be determined at the time of pricing. Proceeds are expected to be used to repurchase or repay the company's 0% Convertible Senior Notes due 2026 and for general corporate purposes. No URL for the full prospectus is included in the document.