ATO vs SO
Atmos Energy (ATO) and Southern (SO) compared side by side. Southern (SO) is larger, with a market cap of $106.9B versus $29.1B for Atmos Energy, about 3.7 times the size. On trailing earnings, ATO is cheaper at 20.5x versus 22.4x for SO.
Head to head
| Metric | ATO | SO |
|---|---|---|
| Market cap | $29.1B | $106.9B |
| P/E (TTM) | 20.5x | 22.4x |
| Forward P/E | 19.1x | 18.9x |
| Revenue (TTM) | $4.9B | $30.2B |
| Revenue growth | 4.8% | 0.1% |
| Gross margin | 62.2% | 48.3% |
| Operating margin | 37.2% | 29.6% |
| Free cash flow | -$2.0B | -$3.3B |
| Dividend yield | 2.32% | 3.27% |
| 1-year return | +0.3% | -0.2% |
| 5-year return (annual) | +15.7% | +12.1% |
| Max drawdown | -52% | -38% |
| FI Handbook grade | C- | C- |
Highlighted: the stronger figure on metrics where higher or lower is clearly better.
Growth of $10,000 (5 years, price only)
ATO vs SO FAQ
Which is bigger, ATO or SO?
Southern (SO) is larger, with a market cap of $106.9B versus $29.1B for Atmos Energy, about 3.7 times the size.
Is ATO or SO cheaper?
On trailing earnings, ATO is cheaper at 20.5x versus 22.4x for SO. A lower P/E can reflect slower expected growth, so compare growth and margins too.
Which stock performed better over the past year, ATO or SO?
ATO returned +0.3% over the past year including dividends, versus -0.2% for SO, through October 23, 2026.
Which pays a higher dividend, ATO or SO?
SO yields 3.27% versus 2.32% for ATO.
Full pages: Atmos Energy · Southern