S&P 500 comparison · Utilities

American Electric Power vs Duke Energy

Prices at close . Model readings .

American Electric Power

$128.20−1.61%
Month: negative

Duke Energy

$123.57−0.99%
Month: negative
Price change

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.

In short

How the two compare

On the latest closes (28 Oct 2026), Duke Energy is the larger company by market value ($90.95B against $70.13B). Over the past year American Electric Power returned +13.6% and Duke Energy +0.3%, while the S&P 500 returned +12.7%. The operating margin is 22.6% for American Electric Power and 25.7% for Duke Energy. Over the next 21 sessions the model expects −0.53% for American Electric Power, with a 35% chance of a rise, and −0.28% for Duke Energy, with a 63% chance.

Model view

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.

Model readings:
Expected returnnext 21 sessions
AEP−0.53%
DUK−0.28%
Chance of a risenext 21 sessions
AEP35%
DUK63%
Expected returnnext 63 sessions
AEP+0.34%
DUK+0.83%
Range of outcomes63 sessions, 80% band
AEP−12.3% to +13%
DUK−11.5% to +13.1%
Chance of a risenext 63 sessionsMembers only · see plans
Long-run fair valueintrinsic value model
AEP—The model's fair value falls outside its own interval or at the gap clamp, so it is not a measurement.
DUK—The model's fair value falls outside its own interval or at the gap clamp, so it is not a measurement.
Gap to pricefair value against the close
AEP—The model's fair value falls outside its own interval or at the gap clamp, so it is not a measurement.
DUK—The model's fair value falls outside its own interval or at the gap clamp, so it is not a measurement.
Past readings that matchedsign of the 21-session outcome
AEP40.1%of 269
DUK46.5%of 269
Price performance

How the prices moved

Price change over each period, with the S&P 500 (SPY) for comparison.

Closes to
1 monthS&P 500: +1.1%
AEP+7.5%
DUK+8.2%
6 monthsS&P 500: +8.5%
AEP−3.2%
DUK−0.6%
Year to dateS&P 500: +13.3%
AEP+13.7%
DUK+8.2%
1 yearS&P 500: +12.7%
AEP+13.6%
DUK+0.3%
5 yearsS&P 500: +70.7%
AEP+80.8%
DUK+46.6%
1 year against the S&P 500percentage points
AEP+0.9 pts
DUK−12.4 pts
Position in the 52-week range0% low, 100% high
AEP62%close $128.20 in $110.01 to $139.52
DUK59%close $123.57 in $110.99 to $132.18
Against the 200-day average
AEP+1.1%
DUK+0.5%
Valuation

What the market pays

Size and the multiples from the latest filed quarter. A P/E on losses reads n/m.

Filings: quarter to (AEP), (DUK)
Market value
AEP$70.13B28 Oct 2026
DUK$90.95B28 Oct 2026
Enterprise valueat the last filing
AEP$113.00B30 Sep 2026
DUK$117.42B31 Mar 2020
P/Elatest filed
AEP17.8
DUK—Not measured today.
Price to book
AEP1.97
DUK1.24
EV / EBITDA
AEP9.57
DUK—Not in the latest filing data.
Free cash flow yield
AEP2.21%
DUK—Not in the latest filing data.
Dividend yield
AEP1.59%
DUK—Not in the latest filing data.
Questions

American Electric Power or Duke Energy: common questions

Which is larger by market value, American Electric Power or Duke Energy?

Duke Energy, at $90.95B against $70.13B for American Electric Power, on the latest closes (28 Oct 2026).

How did American Electric Power and Duke Energy move over the past year against the S&P 500?

Over the past year American Electric Power returned +13.6% and Duke Energy +0.3%, while the S&P 500 returned +12.7%. Prices at close 28 Oct 2026.

What does the model expect for American Electric Power and Duke Energy over the next month?

−0.53% for American Electric Power with a 35% chance of a rise, and −0.28% for Duke Energy with a 63% chance, over the next 21 sessions. Model readings 28 Oct 2026. These are model readings, not advice.

How do the operating margins of American Electric Power and Duke Energy compare?

The operating margin is 22.6% for American Electric Power and 25.7% for Duke Energy. Filings: quarter to 30 Sep 2026 and 31 Mar 2020.

Do American Electric Power and Duke Energy shares move together?

Over the past year the correlation of their daily returns was 0.72 (often together); 1 means they always move together, 0 unrelated, −1 opposite. Prices at close 28 Oct 2026.

In the consoleCompare up to four companies with every model readingMembers see the 63-session chance of a rise and all four horizons, side by side in Research › Compare.
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The two company pagesAmerican Electric Power (AEP) forecast and analysisDuke Energy (DUK) forecast and analysis
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BrowseAll Utilities companiesAll comparisonsHow the model readings are made

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.