X0407 4/A 2023-06-14 2023-06-16 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 0001594869 Krylov Sergei 17018 INTERSTATE 20 CISCO TX 76437 1 0 0 0 0001696102 Wilks Matthew 17018 INTERSTATE 20 CISCO TX 76437 1 0 0 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 Persons undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission ("SEC"), upon request, full information regarding the number of shares purchased at each separate price. Consists of (i) 3,299,971 directly owned by Wilks Brothers, LLC ("Wilks Brothers"), (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 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; Dan H. Wilks and Staci Wilks are husband and wife and share the same household; Matthew D. Wilks is the Director of the Issuer and VP - Investments of Wilks Brothers; and Sergei Krylov, is the Director of the Issuer and Chief Financial Officer of Wilks Brothers. Matthew D. Wilks and Sergei Krylov were each inadvertently excluded in prior filings and have been added as Reporting Persons. Each of the foregoing are reporting persons on a Schedule 13D/A (as amended from time to time, the "13D") filed with the SEC on June 29, 2023 (such Reporting Persons on the 13D, collectively, the "13D Group") and may be deemed to beneficially own the shares of the Issuer's Common Stock owned by other members of the 13D Group. (Continued from Footnote 3) 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] 2023-06-28