金融工程日报：沪指四连阳重上 3900 点，海南自贸港概念持续发酵-20251222

• The report discusses the market performance on December 22, 2025, highlighting that most indices were in an upward trend, with the CSI 500 Index performing particularly well among scale indices, and the ChiNext Index performing well among sector indices[2][7] - The market sentiment was high, with 104 stocks hitting the daily limit up and 8 stocks hitting the daily limit down at the close of trading[2][14] - The financing balance as of December 19, 2025, was 24,871 billion yuan, and the securities lending balance was 167 billion yuan, with the total margin balance accounting for 2.6% of the market's circulating market value[2][20][23] - The report also provides data on ETF premiums and discounts, noting that the Sci-Tech Growth ETF from Southern Fund had the highest premium at 1.49%, while the Creation 50 ETF from ICBC had the highest discount at 0.51% on December 19, 2025[3][24][26] - The report includes information on block trading, indicating that the average daily transaction amount of block trades in the past six months was 2.1 billion yuan, with a discount rate of 5.21% on December 19, 2025[3][27][29] - The annualized discount rates for the main contracts of stock index futures for the Shanghai 50, CSI 300, CSI 500, and CSI 1000 indices were 0.27%, 4.53%, 8.15%, and 12.34%, respectively, on December 22, 2025[3][29][32] - The report lists the top stocks in terms of net inflow and outflow from institutional seats and Northbound funds, with Sannong Seed Industry, Snowman Group, and Aisen Co., Ltd. among the top net inflow stocks[4][37][38]