People are either vesting 1/48th immediately every month, 3/48th every quarter, or are in the same circumstance a year after starting. The 4 year part is irrele

People are either vesting 1/48th immediately every month, 3/48th every quarter, or are in the same circumstance a year after starting. The 4 year part is irrelevant for them as there is no actual waiting involved. They simple are able to negotiated being enticed by another company that will exceed how much cash they are already collecting. The company they work for gave them a signing bonus that required them to stay one year, the next company will too, as well as a higher base salary and higher dollar amount of shares that begin vesting quickly.