Meff’s volume slides 55% in JulySome 4.71m contracts were traded at Meff, the derivatives branch of Bolsas y Mercados Españoles, in July, down 55% year on year. Of these, 1.17m were stock futures and 2.59m equity options. Also, 773,000 index futures were traded, including 268,000 Ibex Mini Futures and 505,000 Ibex Futures. A total of 184,000 Ibex Options were traded.Open interest at the end of the month was 14.1m...