This paper analyses employment dynamics across firms during the COVID-19 pandemic and the role of job retention schemes (JRS) in shaping these dynamics. It relies on a novel collection of high-frequency harmonised micro-aggregated statistics, computed using administrative data on employment and wages from electronic payroll records across 12 countries linked to monthly information on policy support during COVID-19, as well as on a new indicator of JRS de-jure generosity. The analysis highlights four key findings: i) the employment adjustment margins varied over time, adjusting mainly through the intensive margin in 2020, while both the intensive and the extensive margins contributed to employment changes in 2021; ii) the reallocation process remained productivity enhancing, although to a lower extent on average compared to 2019; iii) JRS were successful in their purpose of cushioning the effect of the crisis on employment growth and firm survival; iv) JRS support did not distort the productivity-enhancing nature of reallocation.