AEE

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Document

NEWS RELEASE

1901 Chouteau Avenue: St. Louis, MO 63103: Ameren.com

Contacts:

Media Financial Analysts and Institutional Investors

Ameren CommunicationsAmeren Investor Relations

314.554.2182314.554.3942

communications@ameren.comInvestorRelations@ameren.com

For Immediate Release

Ameren Announces Third Quarter 2026 Results

•Third Quarter GAAP Diluted Earnings Per Share (EPS) were $2.42 in 2026 vs. $2.35 in 2025

•Third Quarter Adjusted (Non-GAAP) EPS were $2.42 in 2026 vs. $2.17 in 2025

•Raising 2026 Earnings Guidance Range to $5.35 to $5.55 per Diluted Share

•Establishing 2027 Earnings Guidance Range of $5.70 to $5.90 per Diluted Share

•Issuing EPS Compound Annual Growth Rate Guidance of 8% to 10% for 2027 through 2031, using the 2027 Guidance Midpoint as the Base

ST. LOUIS (November 5, 2026) — Ameren Corporation (NYSE: AEE) today announced third quarter 2026 net income attributable to common shareholders in accordance with generally accepted accounting principles (GAAP) of $676 million, or $2.42 per diluted share, compared to third quarter 2025 GAAP net income of $640 million, or $2.35 per diluted share. Excluding a third quarter 2025 tax benefit described in the table below, Ameren recorded third quarter 2025 adjusted (non-GAAP) net income attributable to common shareholders of $592 million, or $2.17 per diluted share.

Third quarter 2026 results, compared to adjusted third quarter 2025 results, reflected increased earnings on infrastructure investments to improve system reliability, resiliency and service quality, increased earnings on investments in innovative energy technologies, and higher Ameren Missouri electric retail sales, primarily driven by warmer temperatures. These positive contributions were partially offset by higher Ameren Missouri operations and maintenance expenses, primarily driven by increased reliability-focused tree trimming and energy center maintenance. Finally, the earnings per diluted share comparison reflected higher weighted-average basic common shares outstanding in the third quarter of 2026.

"Our third-quarter results were driven by continued execution of our strategy and disciplined investment in critical energy infrastructure to deliver reliable energy for our customers at the lowest cost possible," said Martin J. Lyons, Jr., chairman, president and chief executive officer of Ameren Corporation. "We are well positioned to meet growing energy needs, support significant economic development across our region and deliver lasting benefits for the customers and communities we serve."

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Ameren recorded GAAP net income attributable to common shareholders for the nine months ended September 30, 2026, of $1,347 million, or $4.83 per diluted share, compared to GAAP net income attributable to common shareholders for the nine months ended September 30, 2025, of $1,204 million, or $4.43 per diluted share. Excluding a third quarter 2025 tax benefit described below, Ameren recorded adjusted (non-GAAP) net income attributable to common shareholders of $1,156 million, or $4.25 per diluted share for the nine months ended September 30, 2025. Results for the first nine months of 2026, compared to adjusted results for the first nine months of 2025, reflected higher earnings on infrastructure investments to improve system reliability, resiliency and service quality, higher earnings on investments in innovative energy technologies and higher Ameren Missouri electric retail sales, driven in part by warmer summer temperatures. These positive contributions were partially offset by higher Ameren Missouri operations and maintenance expenses, primarily driven by increased reliability-focused tree trimming and energy center maintenance, and higher interest expense. Finally, the earnings per diluted share comparison reflected higher weighted-average basic common shares outstanding in 2026.

The following items were excluded from adjusted earnings for the three-month and nine-month periods ended September 30, 2025:

(In millions, except per share amounts)

Three Months Ended Sep. 30,Nine Months Ended Sep. 30,

2026202520262025

GAAP Earnings / Diluted EPS$676 $2.42 $640 $2.35 $1,347 $4.83 $1,204 $4.43

Tax benefit from FERC order on net operating loss carryforwards$— $— $(48)$(0.18)$— $— $(48)$(0.18)

Adjusted Earnings / Diluted EPS$676 $2.42 $592 $2.17 $1,347 $4.83 $1,156 $4.25

Earnings and Rate Base Guidance

Today, Ameren is raising its 2026 earnings guidance range to $5.35 to $5.55 from $5.25 to $5.45 per share. Further, Ameren expects 2027 diluted earnings per share to be in a range of $5.70 to $5.90 per share, representing 8.4% growth from the original 2026 guidance midpoint.

"Our strong year-to-date performance gives us confidence to raise our 2026 earnings guidance. As we look to 2027, we’ll continue executing our strategy and investing in energy infrastructure to deliver long-term value for customers and shareh

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2 q12026ex991earningsrelease.htm

EX-99.1

Document

NEWS RELEASE

1901 Chouteau Avenue: St. Louis, MO 63103: Ameren.com

Contacts:

Media Financial Analysts and Institutional Investors

Ameren CommunicationsAndrew Kirk

314.554.2182314.554.3942

communications@ameren.comakirk@ameren.com

For Immediate Release

Ameren Announces First Quarter 2026 Results

•First Quarter Diluted Earnings Per Share (EPS) were $1.28 in 2026 vs. $1.07 in 2025

•Reaffirmed 2026 Earnings Guidance Range of $5.25 to $5.45 per Diluted Share

ST. LOUIS (May 5, 2026) — Ameren Corporation (NYSE: AEE) today announced first quarter 2026 net income attributable to common shareholders of $357 million, or $1.28 per diluted share, compared to first quarter 2025 net income of $289 million, or $1.07 per diluted share.

First quarter 2026 results reflected earnings on infrastructure investments to improve system reliability, resilience, and service quality for our Ameren Missouri and Illinois electric and natural gas customers. These positive contributions were partially offset by lower Ameren Missouri electric retail sales, primarily driven by warmer-than-normal winter temperatures in the current period compared to colder-than-normal temperatures in the prior-year period, along with higher interest expense at Ameren Missouri. Finally, the earnings per diluted share comparison reflected higher weighted-average basic common shares outstanding in the first quarter of 2026.

"Customers depend on us every day for safe, reliable, and affordable energy—and demand is growing," said Martin J. Lyons, Jr., chairman, president and chief executive officer of Ameren Corporation. "Meeting these needs requires disciplined ongoing infrastructure investment. Our strategic plan calls for prudent investments across each of our operating segments to optimize service for our customers and communities today while preparing for the future."

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Earnings Guidance

Today, Ameren reaffirmed its 2026 earnings guidance range of $5.25 to $5.45 per share. Earnings guidance for 2026 assumes normal temperatures for the last nine months of the year and is subject to the effects of, among other things: regulatory, judicial and legislative actions; energy center and energy transmission and distribution operations; energy, economic, capital and credit market conditions; customer usage; severe storms; market returns on company-owned life insurance investments; unusual or otherwise unexpected gains or losses; and other risks and uncertainties outlined, or referred to, in the Forward-looking Statements section of this press release.

Ameren Missouri Segment Results

Ameren Missouri first quarter 2026 earnings were $76 million, compared to first quarter 2025 earnings of $42 million. The year-over-year increase reflected earnings on increased infrastructure investments, including infrastructure reflected in electric and natural gas service rates that became effective June 1, 2025, and September 1, 2025, respectively. These positive factors were partially offset by lower electric retail sales, primarily driven by warmer-than-normal winter temperatures in the current period compared to colder-than-normal temperatures in the prior-year period, along with higher interest expense.

Ameren Transmission Segment Results

Ameren Transmission first quarter 2026 earnings were $98 million, compared to first quarter 2025 earnings of $89 million. The year-over-year increase reflected earnings on increased infrastructure investments.

Ameren Illinois Electric Distribution Segment Results

Ameren Illinois Electric Distribution first quarter 2026 earnings were $66 million, compared to first quarter 2025 earnings of $63 million.

Ameren Illinois Natural Gas Segment Results

Ameren Illinois Natural Gas first quarter 2026 earnings were $122 million, compared to first quarter 2025 earnings of $108 million. The year-over-year increase reflected infrastructure investments included in natural gas service rates that became effective December 2, 2025.

Ameren Parent Results (includes items not reported in a business segment)

Ameren Parent first quarter 2026 loss was $5 million, compared to a first quarter 2025 loss of $13 million.

Analyst Conference Call

Ameren will conduct a conference call for financial analysts at 9 a.m. Central Time on Wednesday, May 6, 2026, to discuss first quarter 2026 earnings, 2026 earnings guidance and other matters. Investors, the news media and the public may listen to a live broadcast of the call at AmerenInvestors.com by clicking on "Webcast" under "Latest

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Quarterly Results," where an accompanying slide presentation will also be available. The conference call and presentation will be archived in the “Investors” section of the website under “Quarterly Earnings.”

About Ameren

St. Louis-based Ameren Corporation powers the quality of life for 2.5 million electric customers and more than 900,000 natural gas customers in a 64,000-square-mile area thr