** Shandong Hi-Speed Holdings Group HKEX:412 jumps 12.8% to HK$14.22; set for biggest one-day pct gain since June 4
** Stock on track to snap three straight sessions of decline
** Investment and money lending services group plans to repurchase shares at a price not exceeding HK$17/share for up to $100 mln, aiming to reflect co's confidence in own business outlook, prospects
** YTD, stock soars 115.6%
