| Symbol | Name | Country | Exchange |
|---|---|---|---|
| BKH | Black Hills Corporation | US | NYSE |
| CPK | Chesapeake Utilities Corporation | US | NYSE |
| D | Dominion Resources, Inc. | US | NYSE |
| KMI | Kinder Morgan, Inc. | US | NYSE |
| NI | NiSource Inc | US | NYSE |
| OKE | ONEOK, Inc. | US | NYSE |
| UTL | UNITIL Corporation | US | NYSE |