british english - Is a company e.g. Pfizer, singular or plural?

Here is from an article from the Economist magazine:

One drug he talks about is an antidepressant called reboxetine (branded as Edronax by
its makers, Pfizer) that he used to prescribe to his patients.

Pfizer is a drug company. It is a singular noun.
Why is it described as its makers, which is plural?

Answer

The style guide of The Economist says:

COLLECTIVE NOUNS

There is no firm rule about the number of a verb governed by a singular collective noun. It is best to go by the sense--that is, whether the collective noun stands for a single entity or for its constituents.

So it is correct to refer to organizational names either as singular or plural but not both--that is, there should be a constancy in writing.

In this case the author wishes to emphasize the individuals of the company.