X0306 4 2020-08-23 0 0001697500 Solaris Oilfield Infrastructure, Inc. SOI 0001370287 Keenan W Howard JR 410 PARK AVENUE 19TH FLOOR NEW YORK NY 10022 1 0 0 0 Class A Common Stock 2020-08-23 4 A 0 12643 0 A 32759 D Class B Common Stock 8954234 I See Footnote Solaris Oilfield Infrastructure, LLC Units Class A Common Stock 8954234 8954234 I See Footnote Restricted Stock Award pursuant to the Solaris Oilfield Infrastructure, Inc. Long Term Incentive Plan. The award vests in full on the first anniversary of the grant date. 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. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for Section 16 or any other purpose. These securities are owned directly by Yorktown Energy Partners X, L.P., a Delaware limited partnership ("Yorktown X"). The reporting person is a member and manager of Yorktown X Associates LLC, the general partner of Yorktown X Company LP, the general partner of Yorktown X. Subject to the terms of the Second Amended and Restated Limited Liability Company Agreement of Solaris Oilfield Infrastructure, LLC ("Solaris LLC"), dated as of May 11, 2017, included as Exhibit 10.1 to the Issuer's Current Report on Form 8-K filed May 17, 2017, the units in Solaris LLC (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. /s/ Cynthia M. Durrett, as attorney-in-fact for W. Howard Keenan, Jr. 2020-08-25