share awards is determined based on the fair market value of RenaissanceRe’s common shares on the grant date. The estimated fair value of performance share awards is amortized as an expense over the requisite service period. Restricted Stock Awards The fair value of restricted stock awards is determined based on the fair market value of RenaissanceRe’s common shares on the grant date. The estimated fair value of restricted stock awards is amortized as an expense over the requisite service period. The Company has elected to recognize forfeitures as they occurred rather than estimating service-based forfeitures over the requisite service period. ash Sett.ed Restricted Stock nits CSRSUs are revalued at the end of each quarterly reporting period based on the then fair market value of RenaissanceRe’s common shares. The total cost is adjusted each quarter for unvested CSRSUs to reflect the current share price, and this total cost is amortized as an expense over the requisite service period. The Company has elected to recognize forfeitures as they occurred rather than estimating service-based forfeitures over the requisite service period. Summary of Stock Compensation Activity ash Sett.ed Restricted Stock nits Number of Shares Nonvested at December 31, 2018 146,917 Awards granted — Awards vested (80,012) Awards forfeited (3,161) Nonvested at December 31, 2019 63,744 Awards granted — Awards vested (44,734) Awards forfeited (529) Nonvested at December 31, 2020 18,481 Awards granted — Awards vested (18,481) Awards forfeited — Nonvested at December 31, 2021 — F-79