diff b/w at & in

[premanand]

Hi,

Which of the following statements is correct?

1) I am working at ABN

2) I am working in ABN

where to use "at" and where to use "in". Please explain.

[Mister Micawber]

.
I presume that ABN is a company's name.

Either is fine; #1 is more common. #1 considers ABN a point location; #2 considers ABN a two- or three-dimensional location. The difference is moot here.
.