Market Overview - The A-share market experienced fluctuations with all three major indices closing lower. The Shanghai Composite Index closed at 3997.56 points, down 0.25%, with a trading volume of 875.49 billion yuan. The Shenzhen Component Index closed at 13404.06 points, down 0.36%, with a trading volume of 1123.57 billion yuan. The ChiNext Index closed at 3208.21 points, down 0.51%, with a trading volume of 498.52 billion yuan [1]. Sector Performance - The top-performing sectors included: - Energy metals with a gain of 2.87%, total trading volume of 606.55 million hands, and a net inflow of 28.04 billion yuan. - Chemical raw materials increased by 2.73%, with a trading volume of 2359.56 million hands and a net inflow of 18.37 billion yuan. - Battery sector rose by 2.50%, with a trading volume of 3640.42 million hands and a net inflow of 57.64 billion yuan. - Agricultural chemical products increased by 2.25%, with a trading volume of 2765.41 million hands and a net inflow of 16.37 billion yuan [2]. - The sectors that faced declines included: - Components sector decreased by 1.58%, with a trading volume of 1208.45 million hands and a net outflow of 24.20 billion yuan. - Software development fell by 1.55%, with a trading volume of 2160.65 million hands and a net outflow of 63.04 billion yuan. - Electric machinery dropped by 1.50%, with a trading volume of 911.78 million hands and a net outflow of 23.72 billion yuan. - IT services declined by 1.48%, with a trading volume of 2515.56 million hands and a net outflow of 59.50 billion yuan [2].

6月6日，继北证50指数，北交所官方发布北证专精特新指数。对此，北研君认为主要把握三个重点 （1）了解新指数的编制情况；（2）专精特新指数最新成分股和北证50指数有哪些异同；（3）复盘北 证50指数，新指数的出现会对市场造成哪些影响，对交易有什么实质性指导意义。三点中尤其是第三 点，最为重要，下面北研君为大家逐一解答： 1、北证专精特新指数的编制情况？ 对比北证50指数和北证专精特新指数，大部分内容是相同的，主要区别体现在（1）选样方面北证专精 特新指数选样条件为样本空间内的证券按照过去六个月的日均成交金额由高到低排名， 剔除排名后30% 的证券 ，北证50则是剔除排名后20%的证券；（2）选样方面专精特新指数新增限制条件为 必须在专精 特新"小巨人"企业中进行筛选 ，即选取其中专精特新"小巨人"作为待选样本，这条规则使的一些非专精 特新企业无法纳入该指数，北证50指数则无此约束，目前北交所已上市的266家公司中国家级专精特 新"小巨人"为141家，如果算上省级的专精特新数量为192家，占比达72.18%。（3）样本股调整方面北 证专精特新指数为 每半年调整一次，每次调整数量一般不超过20% ，而北证50指数 ...