{"schema_version":"secwatch.filing_event.v1","accession":"0000352541-23-000028","form_type":"8-K","ticker":"LNT","cik":"0000352541","company_name":"ALLIANT ENERGY CORP","filed_at":"2023-03-03T23:59:59+00:00","discovered_at":"2026-05-14T18:03:47.625181+00:00","generated_at":"2026-06-18T13:42:53.815147+00:00","sec_items":["1.01","2.03","3.02","8.01","9.01"],"event_type":"debt","sentiment":"neutral","materiality_score":0.55,"calibrated_materiality_score":0.55,"confidence":"high","headline":"Alliant Energy closes $500M 3.875% convertible note offering due 2026","bullets":["Issued $500M aggregate principal of 3.875% Convertible Senior Notes due March 15, 2026.","Initial conversion price of $64.32/share, a 25% premium over Feb 27, 2023 closing price.","Net proceeds of ~$490.9M (or ~$564.6M if $75M greenshoe option fully exercised).","Proceeds to be used for general corporate purposes, including debt repayment and capex.","Notes are senior unsecured, convertible into cash/stock at Alliant's election."],"urls":{"canonical":"https://secwatch.observer/filing/0000352541-23-000028","json":"https://secwatch.observer/filing/0000352541-23-000028.json","markdown":"https://secwatch.observer/filing/0000352541-23-000028.md","text":"https://secwatch.observer/filing/0000352541-23-000028.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/352541/000035254123000028/0000352541-23-000028-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/352541/000035254123000028/lnt-20230227.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-18T13:42:53.815147+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"6bca8c179c326191482f518ead4a1ffca9a6761a","claim":"ALLIANT ENERGY CORP incurred convertible notes of $500 million aggregate principal amount with The Bank of New York Mellon Trust Company, N.A. at 3.875% per year maturing March 15, 2026.","evidence_excerpt":"On March 2, 2023, Alliant Energy Corporation (the “ Company ”) completed its previously announced sale of $500 million aggregate principal amount of 3.875% Convertible Senior Notes due 2026 (the “ Notes ”) in a private offering to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “ Securities Act ”).","evidence_source":"SEC 8-K Item 2.03/2.04","evidence_url":"https://www.sec.gov/Archives/edgar/data/352541/000035254123000028/0000352541-23-000028-index.htm","confidence":0.9,"family_label":"Debt Financings","details":[{"label":"Instrument","value":"convertible notes"},{"label":"Principal","value":"$500 million aggregate principal amount"},{"label":"Counterparty","value":"The Bank of New York Mellon Trust Company, N.A."},{"label":"Rate","value":"3.875% per year"},{"label":"Maturity","value":"March 15, 2026"},{"label":"Event","value":"incurrence"}],"fact_type":"debt_financing"},{"claim_id":"ee88469fb1fbdbe4c168d7f5dafa5ef7b6d8f3ca","claim":"ALLIANT ENERGY CORP entered into Indenture with The Bank of New York Mellon Trust Company, N.A., as trustee valued at $500 million (effective 2023-03-02).","evidence_excerpt":"On March 2, 2023, Alliant Energy Corporation (the “ Company ”) completed its previously announced sale of $500 million aggregate principal amount of 3.875% Convertible Senior Notes due 2026 (the “ Notes ”) in a private offering to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “ Securities Act ”). In addition, each of the initial purchasers has an option to purchase, within a 13-day period from, and including, the date on which the Notes are first issued, up to an additional $75 million aggregate principal amount of the Notes. The Notes bear interest at a fixed rate of 3.875% per year, payable semiannually in arrears on March 15 and September 15 of each year, beginning on September 15, 2023. The Notes will be convertible into cash or a combination of cash and shares of the Company’s common stock, $0.01 par value per share (“ Common Stock ”), as described below. The Notes are senior, unsecured obli","evidence_source":"SEC 8-K Item 1.01/1.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/352541/000035254123000028/0000352541-23-000028-index.htm","confidence":0.95,"family_label":"Material Agreements","details":[{"label":"Action","value":"entry"},{"label":"Agreement","value":"notes offering"},{"label":"Counterparty","value":"The Bank of New York Mellon Trust Company, N.A., as trustee"},{"label":"Value","value":"$500 million"},{"label":"Effective","value":"2023-03-02"}],"fact_type":"material_agreement"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}