** Shares of MarketAxess MKTX.O up 6.3% at $257.11, trading a 7-month high
** Stock top gainer on the S&P 500 .SPX
** The bond trading platform registered a 40% jump y/y in total average daily volume at $41.6 bln led by trading in U.S. high grade credit assets
** Transaction fees per million for total credit was about $154 last month, in line with $154 in the prior year, but up from $143 in July 2024
** Last month, MKTX reported a 8% rise in Q2 quarter profit due to robust trading activity in high-grade corporate debt and government bonds
** Stock down 17.4% YTD compared to a 15% rise in SPX
(Reporting by Medha Singh)