Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q SOLARIS OILFIELD INFRASTRUCTURE, INC. (Exact name of registrant as specified in its charter) Delaware 81-5223109 (State or other jurisdiction of incorporation or organization) (Mark One) (I.R.S. Employer Identification No.) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 9811 Katy Freeway, Suite 700 For the quarterly period ended September 30, 2021 or ☐ TRANSITION REP ...