【金融工程】市场波动加剧，但上行趋势不变——市场环境因子跟踪周报（2025.09.17)

Group 1 - The recent stock market has experienced increased volatility, while the bond market shows signs of improvement but remains oscillatory. The optimistic expectation for the resumption of government bond trading operations has contributed to this recovery, with the ten-year government bond yield dropping below 1.75% [2][5] - The market style has slightly shifted towards small-cap stocks, with growth styles prevailing. The volatility of market styles has increased, while the volatility of value and growth styles has decreased [7][8] - In the commodity market, the strength of the non-ferrous and energy chemical sectors has increased, while the trend strength of other sectors remains stable. The basis momentum across all sectors has decreased [3][20][23] Group 2 - In the options market, the implied volatility of the Shanghai Stock Exchange 50 index remains stable, while the implied volatility of the CSI 1000 index has begun to decline. The market experienced a brief pullback in early September, particularly affecting small-cap stocks, but current sentiment has eased [28] - The convertible bond market showed a relatively flat performance, with the index primarily oscillating. The premium rate for convertible bonds remains stable, and the proportion of low premium convertible bonds has not changed significantly [30]