The SLB Discounted Stock Purchase Plan (DSPP) lets you buy shares of SLB stock at a reduced price.

You may invest from 1% to 10% of your admissible compensation through payroll deductions.

There are two purchase periods every year: from January 1st to June 30th and July 1st to December 31st. The plan looks at the average share price on the first day and the last day only of the purchase periods (and not any day in between).