The Qatar Investment Authority (QIA) today took its holding below nine per cent according to a regulatory filing.
Today's move could surprise some investors, given the sovereign wealth fund's recent participation in Glencore's $2.5bn (£1.7bn) rights issue earlier this year.
The QIA has been reviewing its investment strategy as low oil prices reduce the flow of petrodollars to Gulf states and after the appointment of a new chief executive in December.
Earlier today, Glencore returned to the bond markets for the first time in nearly a year with an offering worth sFr 250m (£176.1m).
It was also the firm's first foray into the markets since the publication of a damning note by analysts at Investec sent its stocks and bonds into a tailspin last year.
Glencore has since sold assets to whittle down its $30bn debt pile. The company plans to reduce net debt from $25.9bn to between $17bn and $18bn this year.