Ameren vs American Water Works
Prices at close . Model readings .
Ameren
$108.00−0.68%- Market value
- $30.10B
- P/E
- 21.0
- 1 year
- +5.2%
American Water Works
$139.79−0.93%- Market value
- $27.83B
- P/E
- 23.0
- 1 year
- +4.1%
Price change, with the S&P 500 as a benchmark
Percent change in each close since the start of the chosen range, for both companies and the S&P 500 (SPY). Daily closes over the last year, weekly before that and monthly before five years.
How the two compare
On the latest closes (28 Oct 2026), Ameren is the larger company by market value ($30.10B against $27.83B). Over the past year Ameren returned +5.2% and American Water Works +4.1%, while the S&P 500 returned +12.7%. The latest filed P/E is 21.0 for Ameren and 23.0 for American Water Works, and the operating margin 21.9% against 42.7%. Over the next 21 sessions the model expects −0.38% for Ameren, with a 63% chance of a rise, and −0.29% for American Water Works, with a 61% chance. Ameren has no published fair value today. American Water Works' long-run fair value is $137.02, a gap of −2% to its price; the long-run model view is neutral.
What the model expects
Expected returns and the chance of a rise from our forecasting models, and the long-run fair value against the price. Readings, not advice.
How the prices moved
Price change over each period, with the S&P 500 (SPY) for comparison.
What the market pays
Size and the multiples from the latest filed quarter. A P/E on losses reads n/m.
How much of revenue becomes profit
Margins and returns on capital from the latest filing; revenue, net income and earnings per share over the trailing twelve months.
How fast the business grew
Change against the same quarter a year earlier.
Balance sheet and quality scores
Leverage, liquidity and two published scores: Altman Z (below 1.8 the distress zone, above 3 the safe zone) and Piotroski F (0 to 9).
How the shares trade
Volatility, sensitivity to the market, the deepest fall, short interest and how closely the two move together.
Ameren or American Water Works: common questions
Which is larger by market value, Ameren or American Water Works?
Ameren, at $30.10B against $27.83B for American Water Works, on the latest closes (28 Oct 2026).
Which has the higher P/E ratio, Ameren or American Water Works?
American Water Works has the higher latest filed P/E, 23.0; Ameren's is 21.0. Filings: quarter to 30 Jun 2026 and 30 Sep 2026.
How did Ameren and American Water Works move over the past year against the S&P 500?
Over the past year Ameren returned +5.2% and American Water Works +4.1%, while the S&P 500 returned +12.7%. Prices at close 28 Oct 2026.
What does the model expect for Ameren and American Water Works over the next month?
−0.38% for Ameren with a 63% chance of a rise, and −0.29% for American Water Works with a 61% chance, over the next 21 sessions. Model readings 28 Oct 2026. These are model readings, not advice.
How do the operating margins of Ameren and American Water Works compare?
The operating margin is 21.9% for Ameren and 42.7% for American Water Works. Filings: quarter to 30 Jun 2026 and 30 Sep 2026.
Do Ameren and American Water Works shares move together?
Over the past year the correlation of their daily returns was 0.51 (often together); 1 means they always move together, 0 unrelated, −1 opposite. Prices at close 28 Oct 2026.
Model readings are research estimates, not investment advice. Prices: daily closes. Fundamentals: the latest SEC filings. Short interest: FINRA, settlement 30 Sep 2026. A dash means the figure is not in our data; it is never shown as zero. The model view follows a published rule: next month by the sign of the expected return, the long run positive at a fair value 10% or more above the price and negative at 10% or more below it.