专业服务板块8月28日涨1.89%，钢研纳克领涨，主力资金净流入2886.12万元

Core Insights - The professional services sector experienced a rise of 1.89% on August 28, with Steel Research Nack leading the gains [1] - The Shanghai Composite Index closed at 3843.6, up 1.14%, while the Shenzhen Component Index closed at 12571.37, up 2.25% [1] Stock Performance Summary - Steel Research Nack (300797) saw a significant increase of 20.00%, closing at 18.60 with a trading volume of 402,600 shares and a transaction value of 707 million [1] - Other notable performers included: - Lanshan Co. (600826) with a 6.41% increase, closing at 11.96 [1] - Shicun Testing (301228) with a 5.20% increase, closing at 27.72 [1] - Su Shi Testing (300416) with a 5.19% increase, closing at 19.05 [1] Capital Flow Analysis - The professional services sector saw a net inflow of 28.86 million in main funds, while retail funds experienced a net outflow of 17.51 million [2] - Key stocks in terms of capital flow included: - Steel Research Nack (300797) with a net inflow of 133 million from main funds [3] - Su Shi Testing (300416) with a net inflow of 74.18 million from main funds [3] - Lanshan Co. (600826) with a net inflow of 69.47 million from main funds [3]