0000950123-18-002195.txt : 20180214 0000950123-18-002195.hdr.sgml : 20180214 20180214125935 ACCESSION NUMBER: 0000950123-18-002195 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20171231 FILED AS OF DATE: 20180214 DATE AS OF CHANGE: 20180214 EFFECTIVENESS DATE: 20180214 FILER: COMPANY DATA: COMPANY CONFORMED NAME: Yorktown Energy Partners X, L.P. CENTRAL INDEX KEY: 0001577919 IRS NUMBER: 462445852 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-17861 FILM NUMBER: 18610123 BUSINESS ADDRESS: STREET 1: 410 PARK AVENUE STREET 2: 19TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10022 BUSINESS PHONE: 212-515-2115 MAIL ADDRESS: STREET 1: 410 PARK AVENUE STREET 2: 19TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10022 13F-HR 1 primary_doc.xml 13F-HR LIVE false true false 0001577919 XXXXXXXX 12-31-2017 12-31-2017 Yorktown Energy Partners X, L.P.

410 Park Avenue 19th Floor New York NY 10022

13F HOLDINGS REPORT 028-17861 Y Yorktown X Company LP is the sole general partner of Yorktown Energy Partners X, L.P. Yorktown X Associates LLC is the sole general partner of Yorktown X Company LP. As a result, Yorktown X Associates LLC and Yorktown X 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 X, L.P. Bryan H. Lawrence 212-515-2112 /s/ Bryan H. Lawrence New York NY 02-14-2018 2 5 572060 false 1 028-17862 Yorktown X Co LP 2 028-17863 Yorktown X Associates LLC INFORMATION TABLE 2 form13fInfoTable.xml INFORMATION TABLE FOR FORM 13F Extraction Oil and Gas Inc COM 30227M105 251201 17554262 SH DFND 1,2 17554262 0 0 Ramaco Res Inc COM 75134P303 25407 3692881 SH DFND 1,2 3692881 0 0 Solaris Oilfield Infrstr Inc COM CL A 83418M103 264684 12362622 SH DFND 1,2 12362622 0 0 Diamondback Energy Inc COM 25278X109 15726 124562 SH DFND 1,2 124562 0 0 Kimbell RTy Partners LP UNIT 49435R102 15042 925634 SH DFND 1,2 925634 0 0