The group, with a market capitalisation of some 1.6 billion euros ($2.3 billion) at Tuesday’s close, will replace Belgian holding company NPM/CNP NAT.BR, which was delisted last week.
Nyrstar, a joint venture combining the zinc smelting assets of Belgium’s Umicore (UMI.BR) and Australia’s Zinifex ZFX.AX, was floated in October 2007 at 20 euros and entered the Bel-20.
However, as the stock fell to below 2 euros a year later, Nyrstar subsequently dropped out of the benchmark index. It closed at 9.31 euros on Tuesday. (Reporting by Philip Blenkinsop)