My only guess is that "its" refers to a company mentioned in a prior sentence. In which case, "founding" sounds most natural to me. Foundation is a noun, so I do not see how you could properly use that here.
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Bn77I thought that the following two phrases have the same meaning. Am I understanding something wrong?the foundation of the companythe founding of the company"founding" is a verb that means "to begin or create", in this case it refers to the point in time when the company was started.