In a Secondary Share Sale, an allocation of shares usually held outside of the Republic Europe nominee are purchased and brought into the Republic Europe nominee. Typically these shares are from early investors or employees of the company seeking an early exit, and have therefore been owned external to the nominee.
On the Secondary Market, Republic Europe investors are able to buy and sell shares in Republic Europe portfolio companies, all of which are already held within the Republic Europe nominee. There is less administrative work required and no need for issuer approval as all the shares are legally owned by the same entity, the Republic Europe nominee. For more information on how the secondary market works, see this page.