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Usually you get a 4 year grant that vests monthly or weekly or whatever over the four years. You get one of those every year, so after 4 years you have 4 stacked vesting bonuses, when the oldest runs out, the new one you got that year will take its place.

In most companies I have seen, you are given "refreshers" at a yearly cadence. So for example if you have an initial stock grant of $100K, vesting over 4 years (so $25k per year if split equally). Then at year 1 you might get another $80k, vesting over 4 years, then the next year $120k, etc.

Of course this varies. Some may not give you any refreshers at all, biasing towards recruiting you rather than retaining. Some will give much larger refreshers when you perform well. Some (eg. Amazon) also have a backloaded vesting schedule (something like 5%,15%,40% and 40% over 4 years).

You might get refreshes. Though if you join a company when the stock was $10 and you get 100 shares a year and then after for 3 years it's trading at $30, your refresh might only be 33 shares at $30.