The notice comes a day after Zhao published a memo via his personal investment vehicle, Beijing Jiankun, arguing that Beijing Jianguang Asset Management (JAC Capital) and Wise Road Capital, two state-backed firms poised to take over Unigroup, were undervaluing its assets.
Zhao's Beijing Jiankun holds a 49% stake in Unigroup, with the remainder held by China's elite Tsinghua University. In the previous decade, with government funding, Unigroup built up stakes in a number of Chinese chip companies.
In its post, Unigroup management said the value in Zhao's stake in Unigroup via Beijing Jiankun had become negative, and that after several rounds of bidding from strategic investors, the highest offers "still cannot cover all of Tsinghua Unigroup's debts".