At Yandex, RSUs are subject to a 4-year vesting schedule: 25% vests in each year (6.25% every 3 months).
Terms of RSUs. Pursuant to an RSU award, you will have the right to receive a number of Yandex Class A shares, at no cost to you, upon satisfaction of the time-based vesting criteria of your award. For example, if you have an RSU award for 100 shares, with 25% vesting on a specified date, then on that date you will be entitled to receive 25 shares, at no cost. There is no exercise price associated with the RSUs.