"work in" or "work for"

[queux]

Hi!
Which is correct and please give some explanation. Thanks.

1. I am working in a pharmaceutical company.
2. I am working for a pharmaceutical company.

[Clark]

Originally Posted by queux

Hi!
Which is correct and please give some explanation. Thanks.

1. I am working in a pharmaceutical company.
2. I am working for a pharmaceutical company.

I would choose the second variant 'for'.

'In' is good when a place of work is associated with some building, e.g. She works in a toy shop.'

[hotmetal]

Clark's answer is correct. I would like to add a little extra information though.
When you are talking about a company, the preferred preposition is 'for'. It is common to use 'in' when you are referring to a building (as Clark says), but also a particular industry or branch. For example.

I work in graphic design.
(Graphic design is the discipline or field in which I work)

I work for a large advertising agency.
(The agency is the company for whom I work)

I work in a design studio
(The studio is the place in which I work).