An equity provision that fully vests unvested shares only when two events both occur within a defined window: the company is acquired, and the employee is terminated without cause or resigns for good reason within a year of closing.
When Microsoft acquired GitHub in 2018 for $7.5B in Microsoft stock, the deal documents disclosed the standard double-trigger structure: employee RSUs converted into Microsoft equity on closing, with full acceleration only if the employee was terminated without cause within twelve to twenty-four months. The structure preserved retention through the integration and is the template most strategic acquirers now use.