The company is reestablishing contact with its former clients.

reestablishing 是动词 reestablish 的现在分词形式。reestablish 由前缀 re-（表示"重新"）和动词 establish（建立）组成，字面意思是"重新建立"。 reestablish contact 表示"重新建立联系"，指恢复之前中断或失去的联系。