EFT Securities Ltd. specialize in exchange-traded funds tracking commodities, such as petroleum and gold. ETF Securities group of companies currently include Gold Bullion Securities Limited and Oil Securities Limited. Exchange-traded funds (or ETFs) are open-ended collective investment schemes, traded as shares on most global stock exchanges. ... The word commodity is a term with distinct meanings in business and in Marxian political economy. ... Pumpjack pumping an oil well near Sarnia, Ontario Petroleum (from Greek petra â rock and elaion â oil or Latin oleum â oil ), crude oil, sometimes colloquially called black gold or Texas Tea, is a thick, dark brown or greenish liquid. ... General Name, Symbol, Number gold, Au, 79 Chemical series transition metals Group, Period, Block 11, 6, d Appearance metallic yellow Atomic mass 196. ...