We need a bit more context here. "BEI" can refer to:

1. BEI Resources -- a source of chemical tools to study various diseases.
2. BEI Engineering-- a company the produces position sensors
3. BEI Construction -- an electrical design firm
4. BEI Hawaii -- an agricultural product firm
5. etc.

"BI" has even more multiple definitions.

Define your terms and we may be able to give you a more definite answer.