X0306 4 2017-01-13 0 0000703604 LAWSON PRODUCTS INC/NEW/DE/ LAWS 0000310051 KING LUTHER CAPITAL MANAGEMENT CORP 301 COMMERCE STREET SUITE 1600 FORT WORTH TX 76102 0 0 1 0 0001406372 LKCM Private Discipline Master Fund, SPC C/O LUTHER KING CAPITAL MANAGEMENT 301 COMMERCE STREET, SUITE 1600 FORT WORTH TX 76102 0 0 1 0 0001502283 LKCM Core Discipline, L.P. 301 COMMERCE STREET SUITE 1600 FORT WORTH TX 76102 0 0 1 0 0001502285 LKCM Micro-Cap Partnership, L.P. 301 COMMERCE STREET SUITE 1600 FORT WORTH TX 76102 0 0 1 0 0001406371 LKCM Investment Partnership, L.P. 301 COMMERCE STREET SUITE 1600 FORT WORTH TX 76102 0 0 1 0 0001621801 LKCM Headwater Investments II, L.P. 301 COMMERCE STREET SUITE 1600 FORT WORTH TX 76102 0 0 1 0 0001290407 King Luther Jr 301 COMMERCE STREET SUITE 1600 FORT WORTH TX 76102 0 0 1 0 0001406297 King John Bryan 301 COMMERCE STREET SUITE 1600 FORT WORTH TX 76102 0 0 1 0 Common Stock 2017-01-13 4 P 0 232616 23.0491 A 2210704 I See Footnotes This Form 4 is filed on behalf of Luther King Capital Management Corporation (LKCM), LKCM Private Discipline Master Fund, SPC, on behalf of its wholly-owned subsidiary PDLP Lawson, LLC (PDP), LKCM Investment Partnership, L.P. (LIP), LKCM Micro-Cap Partnership, L.P. (Micro), LKCM Core Discipline, L.P. (Core), LKCM Headwater Investments II, L.P. (Headwater), J. Luther King, Jr. and J. Bryan King (Reporting Persons). LKCM Private Discipline Management, L.P. holds the management shares of PDP, and LKCM Alternative Management, LLC (PDP GP) is its general partner. LKCM Investment Partnership GP, LLC (LIP GP) is the general partner of LIP. LKCM Micro-Cap Management, L.P. is the general partner of Micro. LKCM Core Discipline Management, L.P. (Core GP) is the general partner of Core. LKCM Headwater Investments II GP, L.P. (Headwater GP) is the general partner of Headwater. LKCM is the investment manager for PDP, LIP, Micro, Core, and Headwater. J. Luther King, Jr. is a controlling shareholder of LKCM and LIP GP, J. Luther King, Jr. and J. Bryan King are controlling members of Micro GP and Core GP, and J. Bryan King is a controlling member of Headwater GP. Includes (i) 1,689,358 shares held by PDP, (ii) 250,000 shares held by LIP, (iii) 26,102 shares held by Micro, (iv) 10,128 shares held by Core, (v) 232,616 shares held by Headwater and (vi) 2,500 shares held by a separately managed portfolio for which LKCM serves as investment adviser. Each of the Reporting Persons expressly disclaims membership in a group under the Securities Exchange Act of 1934, as amended, with respect to the securities reported herein, and this Form 4 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 expressly disclaims beneficial ownership of the securities reported herein, except to the extent of its pecuniary interest therein, and this Form 4 shall not be deemed to be an admission that any such Reporting Person is the beneficial owner of such securities for purposes of the Securities Exchange Act of 1934, as amended, or for any other purposes. J. Bryan King, for Luther King Capital Management Corporation 2017-01-17 J. Bryan King, for LKCM Private Discipline Master Fund, SPC 2017-01-17 J. Luther King, Jr., for LKCM Investment Partnership, L.P. 2017-01-17 J. Bryan King, for LKCM Micro-Cap Partnership, L.P. 2017-01-17 J. Bryan King, for LKCM Core Discipline, L.P. 2017-01-17 J. Bryan King, for LKCM Headwater Investments II, L.P. 2017-01-17 J. Luther King, Jr. 2017-01-17 J. Bryan King 2017-01-17