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A Buy/out is that your company is bought by another company, it\'s also called "Acquisition", then your company becomes a subsidiary of the parent company which is the one who buys your company, normally it means your company will change Tax-ID.
A merger is that your company merged with another company, it can either be that your company buys other company, or it\'s a pooling of interest.
A spin-off is that originally, your company is a part of the big company (parent), and for some reason the parent company believe it\'s not good for them to keep this part any more, so it eithers sells your company to another company or your company may pay the parent company to be independent.
As long as your company\'s tax ID changes, that means your company becomes another entity, you have to re-file I-140 according to INS, to prove that your company is a "successor in interest" of the previous company