13F-HR LIVE false true false 0001667954 XXXXXXXX 12-31-2018 12-31-2018 Yorktown Energy Partners XI, L.P.

410 Park Avenue, 19th Floor New York NY 10022

13F HOLDINGS REPORT 028-17860 Y Yorktown XI Company LP is the sole general partner of Yorktown Energy Partners XI, L.P. Yorktown XI Associates LLC is the sole general partner of Yorktown XI Company LP. As a result, Yorktown XI Associates LLC and Yorktown XI Company LP may be deemed to have the power to vote or direct the vote or to dispose or direct the disposition of the shares owned by Yorktown Energy Partners XI, L.P. Bryan H. Lawrence 212-515-2111 /s/ Bryan H. Lawrence New York NY 02-14-2019 2 2 46142 false 1 028-17928 Yorktown XI Co LP 2 028-17865 Yorktown XI Associates LLC