BDO's main office is in Karachi and i have been there so can tell u about them only.
1. UBL
2. Colgate and palmolive
3. Clover
4. East west insurance
5. Premier insurance
6. ZTBL
7. Century paper
8. Merit packaging
9. Cybernet
10. Suraj cotton
11. Dawood equities
12. Ittehad chemicals
13. Tapal Energy
14. BearingPoint
15. Sarhad cigerattes
16. Papco
17. JS Bank
and many others...