股指基差系列：期货视角的风险偏好衰减

Group 1: Report Overview - Investment Rating: Not mentioned - Core View: The report analyzes the July stock index basis market. In the short - term, the risk preference in the futures market has declined, and the short - side power has increased marginally. In the medium - to - long - term, the index is expected to rise and the discount to converge this year, but the subsequent upward momentum may weaken, and the discount convergence may slow down [5][22] Group 2: Recent Basis Review - Market Trends: In July, the market revolved around domestic and overseas mainlines. Domestically, the "anti - involution" concept boosted the market, which then cooled down. Overseas, the US tariff negotiations affected the dollar index and domestic assets. The market sentiment was mainly optimistic, with high trading volume and continuous inflow of leveraged funds. Most broad - based indices had strong monthly lines, and small - and micro - cap stocks were still strong, while large - cap indices were dragged down by the banking sector [5][6] - Basis Changes: By July 31, 2025, the quarterly contract annualized basis rates of IH, IF, IC, and IM were 1.19%, - 2.02%, - 9.65%, and - 11.6% respectively. IH, IF, and IC were basically flat compared to the end of last month, and the IM discount slightly converged. The basis support weakened in July, and the basis turned down earlier than the index. The intraday 1 - minute frequency basis divergence among varieties increased, indicating a decline in risk preference [8][15] - Product - side Situation: Index - related products saw net outflows, with the scale of four broad - based index ETFs and A500ETF and index - enhanced products declining. The new issuance of index - enhanced products continued. The positions of private - equity neutral strategies increased, and the short - side power strengthened marginally. The CTA strategy maintained a relatively high net long position in stock index futures and was optimistic about the index and futures [17][18] - Strategy Performance: In July, the excess return of long - side substitution relative to the index was about 1%. The short - side hedging cost of IC and IM current - month contracts was lower than that of quarterly contracts by about 0.5%. The inter - period spread was affected by contract roll - over and declined at the end of the month [21] Group 3: Long - side Roll - over Performance Review - Performance Data: As of July 2025, the annualized excess returns of IF, IH, IC, and IM long - side roll - over strategies in the past 250 trading days were - 3.6%, 0.5%, 1.5%, and - 4.6% respectively [26] Group 4: Short - side Roll - over Performance Review - Performance Data: As of July 2025, the annualized excess returns of IF, IH, IC, and IM short - side roll - over strategies in the past 250 trading days were - 0.5%, - 0.3%, 2.0%, and - 0.1% respectively [33]