Certain Common Stock of Pioneer Natural Resources Company are subject to a Lock-Up Agreement Ending on 10-JUN-2021. These Common Stock will be under lockup for 31 days starting from 10-MAY-2021 to 10-JUN-2021. Details: The executive officers and directors have agreed that they will not offer, sell, contract to sell, pledge, or otherwise dispose of (or enter into any transaction which is designed to, or might reasonably be expected to, result in the disposition (whether by actual disposition or effective economic disposition due to cash settlement any common stock or any securities convertible into or exercisable or exchangeable for common stock, for a period of 30 days after the date of the underwriting agreement without the prior written consent of Goldman Sachs & Co. LLC and J.P. Morgan Securities LLC. .