Contribute up to 10% of your pay, on an after-tax basis, to an account that is used to purchase Boston Scientific stock at a 15% discount off the market price. There are two six-month offering periods each year, which begin in January and July. Open enrollment takes place from November 15 – December 15 or from May 15 – June 15 for the following offering period. Once you have enrolled to the GESOP plan, you will remain enrolled for future offering periods unless you decide to withdraw from the plan.