The third generation Shirojiro Kiyotsugu continued to serve as a merchant holding the bakufu's warrant, and furthermore, he obtained the special privilege to the shuinsen boeki (trading by ships with a shogunal charter for foreign trade from the late 16th century to the mid-17th century) and he acquired great wealth.
三代四郎次郎清次は引き続き幕府御用達商人をつとめ、更に朱印船貿易での特権を獲得し、莫大な富を得る。