Trip.com's Hong Kong shares surged 8% after the travel group posted strong Q2 results and unveiled a $5 billion share buyback. Revenue rose 16% to 14.8 billion yuan ($2.1 billion), while net profit climbed 27% on robust travel demand. Retail sentiment on Stocktwits turned "extremely bullish," with investors eyeing gains in US-listed ADRs as pre-market trading opens.