I need to review the filing for substantive financial content to produce the article. The filing is a 10-Q for the quarterly period ended September 30, 2026, filed by Ameren Corporation. The filing content provided is primarily the cover page, table of contents, glossary, and forward-looking statements section. The forward-looking statements section does contain substantive regulatory and operational disclosure context. I have enough to work with given the cover page data and the disclosures present.

Ameren Corporation, together with subsidiaries Union Electric Company and Ameren Illinois Company, filed a combined Form 10-Q for the quarterly period ended September 30, 2026, with the U.S. Securities and Exchange Commission on November 6, 2026.

Key Highlights

  • Three registrants covered: The combined filing is separately filed by Ameren Corporation, Union Electric Company (d/b/a Ameren Missouri), and Ameren Illinois Company (d/b/a Ameren Illinois), each on its own behalf.
  • Shares outstanding as of October 30, 2026: Ameren Corporation had 276,937,491 shares of common stock outstanding; Union Electric Company had 102,123,834 shares held by Ameren Corporation; Ameren Illinois Company had 25,452,373 shares held by Ameren Corporation.
  • New preferred resource plan filed: According to the filing, Ameren Missouri filed its 2026 preferred resource plan (2026 PRP) with the MoPSC in September 2026 as part of its integrated resource plan.
  • Pending regulatory proceedings: The filing identifies active proceedings including Ameren Missouri's electric service regulatory rate review filed with the MoPSC in June 2026, and Ameren Illinois' 2025 electric distribution service revenue requirement reconciliation adjustment review filed with the ICC in April 2026.
  • Ameren Illinois appeal noted: The filing references Ameren Illinois' January 2026 appeal of the November 2025 ICC order issued in the 2025 natural gas delivery service rate review.
  • Filer classification: Ameren Corporation is classified as a large accelerated filer; Union Electric Company and Ameren Illinois Company are each classified as non-accelerated filers.

Ameren's Combined September 2026 Quarterly Report: Registrants, Share Counts, and Regulatory Proceedings

Ameren Corporation (NYSE:AEE) filed this combined Form 10-Q for the quarterly period ended September 30, 2026, covering three co-registrants: Ameren Corporation, Union Electric Company, and Ameren Illinois Company. According to the filing, each registrant is filing on its own behalf only the information that relates to it. As of October 30, 2026, Ameren Corporation reported 276,937,491 shares of its common stock (par value $0.01 per share) outstanding. Union Electric Company reported 102,123,834 shares of common stock (par value $5.00 per share), held entirely by Ameren Corporation, and Ameren Illinois Company reported 25,452,373 shares of no-par-value common stock, also held entirely by Ameren Corporation.

On the regulatory front, the filing discloses a number of active proceedings and filings that the company identified among the factors that could cause actual results to differ from forward-looking statements. These include Ameren Missouri's electric service regulatory rate review filed with the MoPSC in June 2026, Ameren Illinois' 2025 electric distribution revenue requirement reconciliation adjustment review filed with the ICC in April 2026, Ameren Illinois' January 2026 appeal of the November 2025 ICC order in the 2025 natural gas delivery service rate review, and Ameren Illinois' 2020 QIP reconciliation hearing. The filing notes these proceedings as factors affecting the company's ability to recover costs and earn a return.

The filing also introduces the term "2026 PRP," defined as Ameren Missouri's preferred resource plan for meeting customers' projected long-term energy needs, which the company disclosed was filed with the MoPSC in September 2026 as part of its integrated resource plan. The forward-looking statements section notes uncertainty around Ameren Missouri's ability to construct or acquire generation and battery energy storage facilities, extend the Callaway Energy Center operating license, retire fossil fuel-fired energy centers, and implement customer energy-efficiency programs in accordance with its Smart Energy Plan. The company noted that such statements involve risks and that "there is no assurance that the expected results will be achieved."

What Was Disclosed

Ameren Corporation and two subsidiaries filed a combined quarterly report for the period ended September 30, 2026, disclosing share counts as of October 30, 2026, filer classifications, and multiple pending state regulatory proceedings in Missouri and Illinois.