SCHEDULE 13D/A

LAWSON PRODUCTS INC/NEW/DE/

Common Stock, $1.00 par value · CUSIP: 520776105

Event date: 2025-02-12

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• LKCM Private Discipline Master Fund, SPC / PDLP Lawson, LLC

  Shares: 3,578,228 · Class: 7.6%

• LKCM Investment Partnership, L.P.

  Shares: 552,500 · Class: 1.2%

• LKCM Micro-Cap Partnership, L.P.

  Shares: 56,470 · Class: 0.1%

• LKCM Core Discipline, L.P.

  Shares: 23,182 · Class: 0.1%

• LKCM Headwater Investments II, L.P.

  Shares: 1,184,652 · Class: 2.5%

• LKCM Headwater II Sidecar Partnership, L.P.

  Shares: 0 · Class: 0%

• LKCM Headwater Investments III, L.P.

  Shares: 0 · Class: 0%

• 301 HW Opus Investors, LLC

  Shares: 16,000,000 · Class: 34.2%

• LKCM TE Investors, LLC

  Shares: 8,000,000 · Class: 17.1%

• Headwater Lawson Investors, LLC

  Shares: 3,522,988 · Class: 7.5%

• LKCM Headwater Investments IV, L.P.

  Shares: 3,434,044 · Class: 7.3%

• Luther King Capital Management CorporationReported CIK 0000310051

  Shares: 36,357,588 · Class: 77.6%

• J. Luther King, Jr.

  Shares: 36,357,588 · Class: 77.6%

• J. Bryan King

  Shares: 35,838,638 · Class: 76.5%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.