SCHEDULE 13D/A 0001193125-23-304047 0000310051 XXXXXXXX LIVE 29 Common Stock, $1.00 par value 02/12/2025 false 0000703604 520776105 Distribution Solutions Group, Inc.

301 COMMERCE STREET SUITE 1700 FORT WORTH TX 76102

Jacob D. Smith (817) 332-3235 301 Commerce Street Suite 1600 Fort Worth TX 76102 Y LKCM Private Discipline Master Fund, SPC / PDLP Lawson, LLC b WC N TX 3578228 0 3578228 0 3578228 N 7.6 OO Y LKCM Investment Partnership, L.P. b WC N TX 552500 0 552500 0 552500 N 1.2 PN Y LKCM Micro-Cap Partnership, L.P. b WC N DE 56470 0 56470 0 56470 N 0.1 PN Y LKCM Core Discipline, L.P. b WC N DE 23182 0 23182 0 23182 N 0.1 PN Y LKCM Headwater Investments II, L.P. b WC N DE 1184652 0 1184652 0 1184652 N 2.5 PN Y LKCM Headwater II Sidecar Partnership, L.P. b WC N DE 0 0 0 0 0 N 0 PN Y LKCM Headwater Investments III, L.P. b WC N DE 0 0 0 0 0 N 0 PN Y 301 HW Opus Investors, LLC b WC N DE 16000000 0 16000000 0 16000000 N 34.2 OO Y LKCM TE Investors, LLC b WC N DE 8000000 0 8000000 0 8000000 N 17.1 OO Y Headwater Lawson Investors, LLC b WC N DE 3522988 0 3522988 0 3522988 N 7.5 OO Y LKCM Headwater Investments IV, L.P. b WC N DE 3434044 0 3434044 0 3434044 N 7.3 PN 0000310051 N Luther King Capital Management Corporation b N DE 36357588 0 36357588 0 36357588 N 77.6 IA CO Y J. Luther King, Jr. b N X1 36357588 0 36357588 0 36357588 N 77.6 IN Y J. Bryan King b N X1 35838638 0 35838638 0 35838638 N 76.5 IN Common Stock, $1.00 par value Distribution Solutions Group, Inc. 301 COMMERCE STREET SUITE 1700 FORT WORTH TX 76102 This Amendment No. 29 to Schedule 13D amends and supplements the Schedule 13D filed by the Reporting Persons with respect to the Common Stock, par value $1.00 per share ("Common Stock"), of Distribution Solutions Group, Inc. (the "Issuer"). Except as set forth below, all previous Items remain unchanged. Capitalized terms used herein but not defined herein shall have the meanings given to them in the Schedule 13D, as amended, filed with the Securities and Exchange Commission. Each of the Reporting Persons hereby expressly disclaims membership in a "group" under the Securities Exchange Act of 1934 with respect to the securities reported herein, and this Schedule 13D shall not be deemed to be an admission that any such Reporting Person is a member of such a group. Each of the Reporting Persons hereby expressly disclaims beneficial ownership of the securities reported herein, other than to the extent of its pecuniary interest therein, and this Schedule 13D shall not be deemed to be an admission that any such Reporting Person is the beneficial owner of the securities reported herein for purposes of the Securities Exchange Act of 1934 or for any other purpose. As of February 12, 2025, the Reporting Persons may be deemed to beneficially own 36,357,588 shares of Common Stock (which represents approximately 77.6% of the outstanding Common Stock based upon information obtained from the Issuer's Form 10-Q for the quarterly period ended September 30, 2024). Sole Shared Sole Shared Voting Voting Dispositive Dispositive Power Power Power Power PDP 3,578,228 0 3,578,228 0 LIP 552,500 0 552,500 0 HW2 1,184,652 0 1,184,652 0 Sidecar 0 0 0 0 HWLI 3,522,988 0 3,522,988 0 HW3 0 0 0 0 HW4 3,434,044 0 3,434,044 0 Gexpro Investors 16,000,000 0 16,000,000 0 TestEquity Investors 8,000,000 0 8,000,000 0 Micro 56,470 0 56,470 0 Core 23,182 0 23,182 0 LKCM 36,357,588 0 36,357,588 0 J. Luther King, Jr. 36,357,588 0 36,357,588 0 J. Bryan King 35,838,638 0 35,838,638 0 Not applicable. Not applicable. Not applicable. Effective February 12, 2025, PDP entered into a credit agreement and related security agreement with UMB Bank, n.a. ("UMB"), pursuant to which PDP granted UMB a pledge of, and security interest in, the shares of Common Stock held by PDP. Effective September 12, 2024, HWLI entered into a credit agreement and related security agreement with UMB, pursuant to which HWLI granted UMB a pledge of, and security interest, the shares of Common Stock held by HWLI. LKCM Private Discipline Master Fund, SPC / PDLP Lawson, LLC /s/ J. Bryan King 02/14/2025 LKCM Investment Partnership, L.P. /s/ J. Luther King, Jr. 02/14/2025 LKCM Micro-Cap Partnership, L.P. s/ J. Bryan King 02/14/2025 LKCM Core Discipline, L.P. /s/ J. Bryan King 02/14/2025 LKCM Headwater Investments II, L.P. /s/ J. Bryan King 02/14/2025 LKCM Headwater II Sidecar Partnership, L.P. /s/ J. Bryan King 02/14/2025 LKCM Headwater Investments III, L.P. /s/ J. Bryan King 02/14/2025 301 HW Opus Investors, LLC /s/ Jacob D. Smith 02/14/2025 LKCM TE Investors, LLC /s/ Jacob D. Smith 02/14/2025 Headwater Lawson Investors, LLC /s/ J. Bryan King 02/14/2025 LKCM Headwater Investments IV, L.P. /s/ J. Bryan King 02/14/2025 Luther King Capital Management Corporation /s/ J. Bryan King 02/14/2025 J. Luther King, Jr. /s/ J. Luther King, Jr. 02/14/2025 J. Bryan King /s/ J. Bryan King 02/14/2025