The Lee family behind the Samsung conglomerate were the sellers of about $2 billion of shares in four Seoul-listed companies, according to people familiar with the matter.

Nearly 30 million shares of Samsung Electronics Co. — the biggest of the four blocks — were offered at a discount of up to 2% to Wednesday’s closing price of 73,600 won. The other smaller offerings were in Samsung SDS Co., Samsung C&T Corp. and Samsung Life Insurance Co. KEB Hana Bank was the seller in all of them, the terms show.