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Ionis Pharmaceuticals announces private placement of $507.5 million principal amount of 0.125% convertible senior notes due 2024

CARLSBAD, Calif. , Dec. 12, 2019 /PRNewswire/ —  Ionis Pharmaceuticals, Inc. (Nasdaq: IONS) (“Ionis”) announced today that it has entered into privately negotiated exchange and/or subscription agreements, with certain holders of its outstanding 1.00% Convertible Senior Notes due 2021 (the “2021