Here are the S-3 shelf registrations from Ameren Illinois 4 PFD (AILLP) in our archive over the last 12 months, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
An S-3 covers the shelf registration that lets an established company sell over time, so if you follow AILLP and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full AILLP filings page.
Ameren Corporation and subsidiaries Union Electric Company (Ameren Missouri) and Ameren Illinois Company filed an automatic shelf registration to offer, from time to time, a wide range of securities, including senior and subordinated debt, common and preferred stock, stock purchase contracts and units, as well as secured and unsecured utility debt and first mortgage bonds. Specific terms and sizes of each issuance will be set in future prospectus supplements. Ameren had 276,843,251 common shares outstanding as of July 30, 2026, out of 400,000,000 authorized, and no preferred shares outstanding; these figures provide capital-structure context, not amounts being registered. Proceeds for Ameren and its utilities may be used for construction and maintenance programs, refinancing debt or equity, strategic investments or acquisitions, and other general corporate purposes, while any selling securityholders will receive their own sale proceeds.