X0206 3 2019-04-23 0 0001745797 Brigham Minerals, Inc. MNRL 0001687161 Yorktown X Associates LLC 410 PARK AVENUE 19TH FLOOR NEW YORK NY 10022 0 0 1 0 Class B Common Stock 3485695 I See Footnotes Brigham Minerals Holdings, LLC Units 0.00 Class A Common Stock 3485695 I See Footnotes Each share of Class B common stock has no economic rights, but entitles its holder to one vote on all matters to be voted on by stockholders generally. Upon closing of the initial public offering (the "Offering") of Brigham Minerals, Inc. (the "Issuer"), (i) the Limited Liability Company Agreement of Brigham Minerals Holdings, LLC ("Brigham LLC") was amended and restated (as amended and restated, the "Brigham LLC Agreement") to, among other things, convert all of the membership interests in Brigham LLC held by its existing owners, into a single class of units in Brigham LLC referred to as Brigham LLC Units and (ii) each member of Brigham LLC, including Yorktown Energy Partners X, L.P., a Delaware limited partnership ("Yorktown X"), received one share of Class B common stock for each Brigham LLC Unit held by such member. These securities are owned directly by Yorktown X. Yorktown X Associates LLC ("Yorktown X Associates") is the sole general partner of Yorktown X Company LP, the sole general partner of Yorktown X. Yorktown X Associates disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that Yorktown X Associates is the beneficial owner of the securities for Section 16 or any other purpose. Subject to the terms of the Brigham LLC Agreement, the Brigham LLC Units (together with a corresponding number of shares of Class B common stock) are exchangeable from time to time for shares of Class A common stock of the Issuer. Yorktown X Associates LLC, /s/W. Howard Keenan, Jr., Manager 2019-05-03