Zheng Xing Xing Ye Ri Bao·2026-01-21 08:54Group 1 - The professional services sector increased by 0.91% on January 21, with Su Shi Testing leading the gains [1] - The Shanghai Composite Index closed at 4116.94, up 0.08%, while the Shenzhen Component Index closed at 14255.12, up 0.7% [1] - Notable gainers in the professional services sector included Su Shi Testing, which rose by 8.09% to a closing price of 20.98, with a trading volume of 710,700 shares and a transaction value of 1.46 billion yuan [1] Group 2 - The professional services sector experienced a net outflow of 118 million yuan from institutional investors, while retail investors saw a net inflow of 155 million yuan [2] - Key stocks with significant net inflows from retail investors included 科锐国际 (Keri International) with a net inflow of 6.69 million yuan, while it faced a net outflow of 45.81 million yuan from institutional investors [3] - The overall trading activity in the professional services sector showed mixed results, with some stocks like 力合科创 (Lihua Technology) and 联检科技 (Lianjian Technology) experiencing positive net inflows from institutional investors [3]