X0407 4 2023-06-14 0 0000799165 DAWSON GEOPHYSICAL CO DWSN 0001662888 Wilks Brothers, LLC 17018 INTERSTATE 20 CISCO TX 76437 0 0 1 0 0001891025 WB Acquisitions Inc. 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 0001641794 Wilks Farris 17018 INTERSTATE 20 CISCO TX 76437 0 0 1 0 0 Class A common stock, par value $0.01 per share 2023-06-14 4 P 0 8895 2.23 A 18847330 I See Footnote The reported price in Column 4 is a weighted average purchase price. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price. Consists of (i) 3,299,971 directly owned by Reporting Party, (ii) 15,547,010 shares of the Issuer's Common Stock directly owned by WB Acquisitions, and (iii) 349 shares of the Issuer's Common Stock directly owned by Staci Wilks. Wilks Brothers, LLC ("Wilks Brothers") is a manager-managed limited liability company, managed by Dan H. Wilks and Farris Wilks. WB Acquisitions, Inc. ("WB Acquisitions") is a subsidiary of Wilks Brothers. Dan H. Wilks and Farris Wilks are brothers and may be deemed to indirectly beneficially own the shares of the Issuer's Common Stock directly owned by each of Wilks Brothers and WB Acquisitions. Dan H. Wilks and Staci Wilks are husband and wife and share the same household, and Dan H. Wilks may be deemed to indirectly beneficially own the shares of the Issuer's Common Stock directly owned by Staci Wilks. 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 4 shall not be construed as an admission that any such Reporting Person is the beneficial owner of any equity securities covered by this Form 4. /s/ [Javier Rocha, Attorney-in-Fact] 2023-06-16