Tax at grant likely for RS; tax at vesting for RSU. Taxable amount is fair market value of the shares on the tax event.
Tax on sale.
Likely allowed if subsidiary reimburses parent under a written agreement, award income is treated as cash remuneration and the general requirements of deductibility are satisfied.
Income Tax:
Likely no, unless subsidiary reimburses parent.
Social Insurance Contributions:
No, unless subsidiary reimburses parent and the award income is treated as cash remuneration and part of the employees' base salary.