Constellation Energy vs Southern
Southern reported revenue of $29.6 billion in fiscal 2025, 1.2 times Constellation Energy's $25.5 billion in fiscal 2025. Constellation Energy's revenue grew 8.3% in its latest year, and Southern's grew 10.6%. Constellation Energy had an operating margin of 12.1%, against 24.6% at Southern. Free cash flow was $1.3 billion at Constellation Energy and −$2.9 billion at Southern.
Side by side
| Constellation Energy | Southern | |
|---|---|---|
| Latest fiscal year | FY2025, Dec 31, 2025 | FY2025, Dec 31, 2025 |
| Revenue | $25.5B | $29.6B |
| Revenue growth | 8.3% | 10.6% |
| Revenue growth a year, last 5 years | 7.7% | 7.7% |
| Gross margin | — | — |
| Operating margin | 12.1% | 24.6% |
| Net margin | 9.1% | 14.7% |
| Free cash flow | $1.3B | −$2.9B |
| Free cash flow margin | 5.0% | −9.9% |
| Return on capital | 10.4% | 5.8% |
| Net debt to EBITDA | 0.9x | 5.3x |
| Dividends and buybacks | $886M | $3.0B |
| Change in diluted share count | −0.3% | 0.6% |
| Last close | $252.48 | $92.57 |
| P/E at the last close | 24.6× | 23.7× |
| Insider trades, last 12 months | bought $417,930, sold $0 | sold $5.6 million |
| Piotroski F-score | 5 of 8 | 4 of 8 |
Amounts in each company's own currency, US$ unless marked (a foreign company may report in another), each company's latest fiscal year from its 10-K, or 20-F or 40-F for a foreign company. Growth rates compare with the year before; the five-year rate is the average a year. Free cash flow is cash from operations minus capital spending; return on capital is after-tax operating income over the money invested in the business; P/E is the last close over the latest earnings per share. Banks are measured differently (return on equity, efficiency ratio), so some rows apply to one company only.
Ten years
Revenue
US$ billions, fiscal years
Constellation EnergySouthern
Operating margin
Percent of revenue
Constellation EnergySouthern
Free cash flow
US$ billions. Cash from operations minus capital expenditure.
Constellation EnergySouthern
Source: the companies' Form 10-K filings, from SEC EDGAR, and the last close. For information only, not investment advice: the figures describe results, not which company is the better investment. The Filing Desk is not affiliated with either company. Full figures on the Constellation Energy and Southern pages.