The employee stock purchase plan (ESPP) allows you to set aside between 2% and 10% of your compensation through payroll deductions to purchase Gen stock every six months at a price that is at least 15% below the fair market value.
The discounted price is locked in for a 12-month period. Enrollment periods are held twice a year in February and August.
For eligibility requirements and other plan terms, refer to the Stock Administration page on Gen Central.