Discovery chief executive Adrian Gore. Photo: Simphiwe Mbokazi.

Johannesburg - Shares of Discovery rise more than 2 percent after it flags half-year earnings are likely to be as much as 25 percent higher.

South Africa's biggest health insurer does not say what was behind the boost.

Its shares are trading up 2.3 percent at 76.50 rand, but they are down 9 percent so far this year. - Reuters