** Shares of bond trading platform MarketAxess MKTX.O rise 4.7% to $188.51
** MKTX reports trading volume statistics for August 2025
** William Blair analyst Jeff Schmitt says MKTX's U.S. high-grade and high-yield market share remained relatively stable versus YTD levels
** Block trading momentum expected to build as MKTX rolls out its targeted trading solution to the U.S. this year - Schmitt
** Seven of 15 brokerages rate the stock "buy" or higher, seven rate "hold" and one rates "sell"; median PT is $213.50, according to data compiled by LSEG
** As of last close, MKTX stock down 20.3% YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com))