Stock index futures collectively weakened, with the main contract of the CSI 300 Index Futures (IF) falling 0.41%, the main contract of the SSE 50 Index Futures (IH) falling 0.11%, the main contract of the CSI 500 Index Futures (IC) falling 0.84%, and the main contract of the CSI 1000 Index Futures (IM) falling 1.05%.