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We report measurements of time-dependent CP asymmetries in B⁰ K⁰S ⁰ decays based on a data sample of (3886) 10⁶ BB events collected at the (4S) resonance with the Belle II detector. The Belle II experiment operates at the SuperKEKB asymmetric-energy e^+e^- collider. We measure decay-time distributions to determine CP-violating parameters S and C. We determine these parameters for two ranges of K⁰S ⁰ invariant mass: m (K⁰S ⁰) (0. 8, 1. 0) GeV/c², which is dominated by B⁰ K^*0 (K⁰S ⁰) decays, and a complementary region m (K⁰S ⁰) (0. 6, 0. 8) (1. 0, 1. 8) GeV/c². Our results have improved precision as compared to previous measurements and are consistent with theory predictions.
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