My understanding is, 回复:请教大家-I140已批,H1Btransfer需要I140批文吗?

if your H-1B extension is still within 6 years, you may not need to provide I-140 notice. I am not sure about this. However, if you are requesting extension beyond 6th year H-1B, you have to provide I-140 petition notice based on AC21.

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