X0202 SCHEDULE 13D/A 0000310051 XXXXXXXX LIVE 32 Common Stock, $1.00 par value 09/09/2026 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 0001406372 N LKCM Private Discipline Master Fund, SPC / PDLP Lawson, LLC b WC N TX 3578228 0 3578228 0 3578228 N 7.7 OO 0001406371 N LKCM Investment Partnership, L.P. b WC N TX 552500 0 552500 0 552500 N 1.2 PN 0001502285 N LKCM Micro-Cap Partnership, L.P. b WC N DE 56470 0 56470 0 56470 N 0.1 PN 0001502283 N LKCM Core Discipline, L.P. b WC N DE 23182 0 23182 0 23182 N 0.1 PN 0001621801 N LKCM Headwater Investments II, L.P. b WC N DE 1184652 0 1184652 0 1184652 N 2.6 PN 0001713995 N LKCM Headwater II Sidecar Partnership, L.P. b WC N DE 0 0 0 0 0 N 0 PN 0001764096 N LKCM Headwater Investments III, L.P. b WC N DE 0 0 0 0 0 N 0 PN 0001921598 N 301 HW Opus Investors, LLC b WC N DE 16000000 0 16000000 0 16000000 N 34.6 OO 0001921624 N LKCM TE Investors, LLC b WC N DE 8000000 0 8000000 0 8000000 N 17.3 OO 0001765653 N Headwater Lawson Investors, LLC b WC N DE 3522988 0 3522988 0 3522988 N 7.6 OO 0001955947 N LKCM Headwater Investments IV, L.P. b WC N DE 3434044 0 3434044 0 3434044 N 7.4 PN 0000310051 N Luther King Capital Management Corporation b N DE 36357588 0 36357588 0 36357588 N 78.7 IA CO 0001290407 N J. Luther King, Jr. b N X1 36357588 0 36357588 0 36357588 N 78.7 IN 0001406297 N J. Bryan King b PF N X1 35838638 0 35838638 0 35838638 N 77.6 IN Common Stock, $1.00 par value Distribution Solutions Group, Inc. 301 Commerce Street Suite 1700 Fort Worth TX 76102 This Amendment No. 32 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, as amended, 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, as amended, or for any other purpose. On September 9, 2026, LKCM Headwater Investments, LLC entered into a Confidentiality Agreement with the Issuer attached hereto as Exhibit 1. Exhibit 1 - Confidentiality Agreement, dated September 9, 2026, by and between the Issuer and LKCM Headwater Investments, LLC. LKCM Private Discipline Master Fund, SPC / PDLP Lawson, LLC /s/ J. Bryan King 09/09/2026 LKCM Investment Partnership, L.P. /s/ J Luther King, Jr. 09/09/2026 LKCM Micro-Cap Partnership, L.P. /s/ J. Bryan King 09/09/2026 LKCM Core Discipline, L.P. /s/ J. Bryan King 09/09/2026 LKCM Headwater Investments II, L.P. /s/ J. Bryan King 09/09/2026 LKCM Headwater II Sidecar Partnership, L.P. /s/ J. Bryan King 09/09/2026 LKCM Headwater Investments III, L.P. /s/ J. Bryan King 09/09/2026 301 HW Opus Investors, LLC /s/ J. Bryan King 09/09/2026 LKCM TE Investors, LLC /s/ J. Bryan King 09/09/2026 Headwater Lawson Investors, LLC /s/ J. Bryan King 09/09/2026 LKCM Headwater Investments IV, L.P. /s/ J. Bryan King 09/09/2026 Luther King Capital Management Corporation /s/ J. Bryan King 09/09/2026 J. Luther King, Jr. /s/ J. Luther King, Jr. 09/09/2026 J. Bryan King /s/ J. Bryan King 09/09/2026