0000950123-18-011895.txt : 20181114 0000950123-18-011895.hdr.sgml : 20181114 20181114160719 ACCESSION NUMBER: 0000950123-18-011895 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20180930 FILED AS OF DATE: 20181114 DATE AS OF CHANGE: 20181114 EFFECTIVENESS DATE: 20181114 FILER: COMPANY DATA: COMPANY CONFORMED NAME: Yorktown Energy Partners VIII, L.P. CENTRAL INDEX KEY: 0001473116 IRS NUMBER: 262754039 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-17371 FILM NUMBER: 181183690 BUSINESS ADDRESS: STREET 1: 410 PARK AVENUE STREET 2: 19TH FLOOR CITY: NEW YORK STATE: NY ZIP: 10022 BUSINESS PHONE: (212) 515-2100 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 0001473116 XXXXXXXX 09-30-2018 09-30-2018 Yorktown Energy Partners VIII, L.P.

410 Park Avenue 19th Floor New York NY 10022

13F HOLDINGS REPORT 028-17371 Y Yorktown VIII Company LP is the sole general partner of Yorktown Energy Partners VIII, L.P. Yorktown VIII Associates LLC is the sole general partner of Yorktown VIII Company LP. As a result, Yorktown VIII Associates LLC and Yorktown VIII 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 VIII, L.P. Bryan H. Lawrence 212-515-2112 /s/ Bryan H. Lawrence New York NY 11-14-2018 2 3 322969 false 1 028-17372 Yorktown VIII Co LP 2 028-17367 Yorktown VIII Associates LLC INFORMATION TABLE 2 form13fInfoTable.xml INFORMATION TABLE FOR FORM 13F Hallador Energy Company COM 40609P105 18349 2950000 SH DFND 1,2 2950000 0 0 Antero Res Corp COM 03674X106 184628 10425078 SH DFND 1,2 10425078 0 0 Antero Midstream GP LP COM SHS REPSTG 03675Y103 119992 7091699 SH DFND 1,2 7091699 0 0