Glencore CEO Ivan Glasenberg

Glencore CEO Ivan Glasenberg

Andrey Rudakov/Bloomberg

Ivan Glasenberg, chief executive officer of Glencore International Plc, is seen in this June 22, 2012 photo. A merger with Anglo would give Johannesburg-born Glasenberg a more prominent role in South Africa, where the London-based firm was founded in 1917 and still derives about half of its operating profits.