Real world company prefixes

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M n O P Q R S T U V W X Y Z Ø
H& H0 H1 H2 H3 H4 H5 H6 H7 H8 H9 HA HB HC HD HE HF HG HH HI HJ HK HL HM HN HO HP HQ HR HS HT HU HV HW HX HY HZ
HHA HHB HHC HHD HHE HHF HHG HHH HHI HHJ HHK HHL HHM HHN HHO HHP HHQ HHR HHS HHT HHU HHV HHW HHX HHy
HHHA HHHF HHHL HHHQ HHHR HHHT HHHU HHHX HHHY
1 HHHX Xcel Energy added 1/2006   NAKINA
2 HHHX Public Service Co. of Colorado added 10/2000; eliminated 10/2002; 7/2005 (not listed)   NAKINA
3 HHHX Public Service Co. of Colorado added 10/2000   NRHS
4 HHHX XCEL ENERGY [PUBLIC SERVICE CO. OF COLORADO]     PWRC
5 HHHX Public Service of Colorado     RSRV
6 HHHX XCEL ENERGY     SCAC4