0000950123-19-002377.txt : 20190215 0000950123-19-002377.hdr.sgml : 20190215 20190214213726 ACCESSION NUMBER: 0000950123-19-002377 CONFORMED SUBMISSION TYPE: 13F-HR/A PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20181231 FILED AS OF DATE: 20190215 DATE AS OF CHANGE: 20190214 EFFECTIVENESS DATE: 20190215 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/A SEC ACT: 1934 Act SEC FILE NUMBER: 028-17861 FILM NUMBER: 19609623 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/A 1 primary_doc.xml 13F-HR/A LIVE false true false 0001577919 XXXXXXXX 12-31-2018 12-31-2018 true 1 RESTATEMENT Yorktown Energy Partners X, L.P.

410 Park Avenue 19th Floor New York NY 10022

13F HOLDINGS REPORT 028-17861 Y The Form 13F-HR filed by Yorktown Energy Partners X, L.P. on February 14, 2019 incorrectly included Class A common stock of Solaris Oilfield Infrastructure, Inc. when Yorktown Energy Partners X, L.P. only holds Class B common stock of Solaris Oilfield Infrastructure, Inc., which are not Section 13(f) Securities as defined in Rule 13f-1(c). 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 212-515-2111 /s/ Bryan H. Lawrence New York NY 02-14-2019 2 2 93588 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 75308 17554262 SH DFND 1,2 17554262 0 0 Ramaco Res Inc COM 75134P303 18280 3692881 SH DFND 1,2 3692881 0 0