What it means
に至っては means “as for” or “when it comes to,” with an added nuance that the selected person or thing is especially notable, extreme, or worthy of separate mention. It commonly follows a noun and is used to single out one item from a broader group, often as the most striking example. The expression is more characteristic of formal or written language than of casual conversation.
Usage note
Do not confuse に至っては in this meaning with に至って, which can mean “reach” or “arrive at” and often describes a process or resulting state. に至っては normally highlights a particular noun as a noteworthy case rather than simply marking a neutral topic.
How to use it
支店の中でも、海外支社に至っては、今年度は一件も契約を結んでいません。
Among the branches, when it comes to the overseas branch, not a single contract has been concluded this fiscal year.
支店の中でも、海外支社に至っては、今年度は一件も契約を結んでいない。
Among the branches, when it comes to the overseas branch, not a single contract has been concluded this fiscal year.