in or by??

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Hello

I got a really silly question I would like to ask just to make sure am not wrong.

Let's in fact suppose I have a company, say XYZ ltd.

Let's also suppose I wanna (want to) use a label for the stuff I produce in which there is space for one single sentence. Do you think it'sd better to use the sentence:

made by XYZ ltd, or

made in XYZ ltd

???

In case one of the 2 is wrong, can you tell me which one is the incriminated version and what level of ignorance it represents? ;-)

p.s.: please reply to this post only if you are really sure about your answer, that is to say if you are a mother tongue! ;-)

thank you very much