X0206 3 2022-02-04 0 0001697500 Solaris Oilfield Infrastructure, Inc. SOI 0001754159 THRC Holdings, LP 17018 INTERSTATE 20 CISCO TX 76437 0 0 1 0 0001834450 THRC Management, LLC 17018 INTERSTATE 20 CISCO TX 76437 0 0 1 0 0001641792 Wilks Dan H. 17018 INTERSTATE 20 CISCO TX 76437 0 0 1 0 0001641796 Wilks Staci 17018 INTERSTATE 20 CISCO TX 76437 0 0 1 0 Class A Common Stock 3218875 D THRC Holdings, LP ("THRC Holdings"), a Texas limited partnership, directly holds the securities of the Issuer. THRC Management, LLC ("THRC Management"), a Texas limited liability company, as General Partner of Holdings, has exclusive voting and investment control over the shares of Class A Common Stock held by THRC Holdings, and therefore may be deemed to beneficially own such shares. Dan Wilks, as sole manager of THRC Management, together with his spouse, Staci Wilks, who share the same household, may be deemed to exercise voting and investment power over the shares of the Issuer's Class A Common Stock directly owned by THRC Holdings, and therefore may be deemed to beneficially own such shares. (Continued from Footnote 1) Each Reporting Person disclaims beneficial ownership of all equity securities reported herein except to the extent of its respective pecuniary interest therein, and the filing of this Form 3 shall not be construed as an admission that any such Reporting Person is the beneficial owner of any equity securities covered by this Form 3. /s/ Matthew Wilks, as attorney-in-fact 2022-02-09