Samsung Group’s de-facto head Lee Kun-hee, who has been hospitalized due to a heart attack since May, saw the value of his share holdings in the conglomerate plunge 7.19 percent from four months earlier, data showed Tuesday, with the decline led by Samsung Electronics’ lackluster performance.

Lee’s holdings came to 10.6 trillion won ($10.2 billion) as of Friday, compared to the 11.5 trillion won posted on May 31, the data compiled by market tracker FnGuide showed. Along with smaller shares in other affiliates, the tycoon holds a 3.38 percent stake in Samsung Electronics, 20.76 percent in Samsung Life Insurance Co. and 1.41 percent in Samsung C&T.

Jay-yong, Lee’s son and heir apparent, also suffered a decline in the value of his stock holdings, which are estimated at 1.93 trillion won, down 16.7 percent over the cited period.

The younger Lee holds a 0.57 percent stake in Samsung Electronics and 25.1 percent stake in Cheil Industries, the de-facto holding firm of Samsung Group through a complex maze of cross shareholding.

Shares of Samsung Electronics have been losing ground on the main bourse, as the firm posted poor earnings for the second quarter amid rising competition with Chinese players in the low-end sector. (Yonhap)