Alliant Energy Prices Offering of $500 Million of 3.250% Convertible Senior Notes due 2028

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MADISON, Wis., May 13, 2025--(BUSINESS WIRE)--Alliant Energy Corporation (NASDAQ: LNT) announced the pricing of its offering of $500 million aggregate principal amount of its 3.250% convertible senior notes due 2028 in a private placement under the Securities Act of 1933, as amended (the "Securities Act"). Alliant Energy also granted each of the initial purchasers of the convertible notes an option to purchase, within a 13-day period from, and including, the date on which the convertible notes are first issued, up to an additional $75 million aggregate principal amount of the convertible notes. The sale of the convertible notes is expected to close on May 15, 2025, subject to customary closing conditions.

Alliant Energy expects that the net proceeds from the convertible notes will be approximately $493.0 million (or $567.0 million if the initial purchasers exercise their option to purchase additional convertible notes in full), after deducting the initial purchasers’ discounts and commissions and offering expenses payable by Alliant Energy. Alliant Energy intends to use the net proceeds from the offering of the convertible notes for the repayment or refinancing of debt, to reduce outstanding commercial paper or for general corporate purposes.

The convertible notes will be senior unsecured obligations of Alliant Energy, and will mature on May 30, 2028, unless earlier converted or repurchased in accordance with their terms. The convertible notes will bear interest at a fixed rate of 3.250% per year, payable semiannually in arrears on May 30 and November 30 of each year, beginning on November 30, 2025.

Prior to the close of business on the business day immediately preceding March 1, 2028, the convertible notes will be convertible at the option of the holders only under certain conditions.

On or after March 1, 2028, until the close of business on the business day immediately preceding the maturity date, holders of the convertible notes may convert all or any portion of their convertible notes at their option at any time at the conversion rate then in effect, irrespective of these conditions. Alliant Energy will settle conversions of the convertible notes by paying cash up to the aggregate principal amount of the convertible notes to be converted and paying or delivering, as the case may be, cash, shares of its common stock, $0.01 par value per share, or a combination of cash and shares of its common stock, at its election, in respect of the remainder, if any, of its conversion obligation in excess of the aggregate principal amount of the convertible notes being converted.