| Rank | Company | Operating income | Sector | Industry | Country | Exchange |
|---|---|---|---|---|---|---|
| 1 | $5.27B | Utilities | Utilities | United States | Nasdaq | |
| 2 | $5.24B | Utilities | Utilities | United States | Nasdaq | |
| 3 | $4.60B | Utilities | Utilities | United States | Nasdaq | |
| 4 | $2.79B | Utilities | Utilities | United States | Nasdaq | |
| 5 | $1.60B | Utilities | Utilities | United States | Nasdaq | |
| 6 | $980M | Utilities | Utilities | United States | Nasdaq | |
| 7 | $319M | Utilities | Utilities | United States | Nasdaq | |
| 8 | $225M | Utilities | Utilities | United States | Nasdaq | |
| 9 | $178M | Utilities | Utilities | United States | Nasdaq | |
| 10 | $169M | Utilities | Utilities | United States | Nasdaq | |
| 11 | $88.0M | Utilities | Utilities | United States | Nasdaq | |
| 12 | $66.1M | Utilities | Utilities | United States | Nasdaq | |
| 13 | $60.2M | Utilities | Utilities | United States | Nasdaq | |
| 14 | $30.5M | Utilities | Utilities | United States | Nasdaq | |
| 15 | $29.3M | Utilities | Utilities | United States | Nasdaq | |
| 16 | $18.5M | Utilities | Utilities | United States | Nasdaq | |
| 17 | $16.9M | Utilities | Utilities | United States | Nasdaq | |
| 18 | $15.7M | Utilities | Utilities | United States | Nasdaq | |
| 19 | $12.7M | Utilities | Utilities | United States | Nasdaq | |
| 20 | $8.18M | Utilities | Utilities | United States | Nasdaq | |
| 21 | $2.33M | Utilities | Utilities | United States | Nasdaq | |
| 22 | $1.13M | Utilities | Utilities | United States | Nasdaq |