The Skipper CCD-in-CMOS Parallel Read-Out Circuit (SPROCKET) is a mixed-signal front-end design for the readout of Skipper CCD-in-CMOS image sensors. SPROCKET is fabricated in a 65 nm process and each pixel occupies a 45µm × 45µm footprint. SPROCKET is intended to be heterogeneously integrated with a Skipper-in-CMOS sensor array, such that one readout pixel is connected to nine multiplexed Skipper-in-CMOS pixels. The circuit achieves 100 ksps with 0.48 e− rms equivalent noise charge (highest gain) and a maximum dynamic range of 9,000 e− (lowest gain). The circuit operates at 100 Kelvin with a power consumption of 40 µW per pixel.