Hi Aspire,
I don't think you will find the fields Company Code, Plant and Equipment in one single IS-U table.
The link b/w Company Code and plant can be find in table T001K, where as link b/w Plant and Equipment can be find in table EQUI.
Alternatively, you can use FM BAPI_EQUI_GETDETAIL to find the Plant details and then use it for finding the company Code.
Hope it helps..
Thanks,
Amlan