X0306 4 2015-06-30 0 0000703604 LAWSON PRODUCTS INC/NEW/DE/ LAWS 0000310051 KING LUTHER CAPITAL MANAGEMENT CORP 301 COMMERCE SUITE 1600 FORT WORTH TX 76102 0 0 1 0 0001406372 LKCM Private Discipline Master Fund, SPC C/O LKCM PRIVATE DISCIPLINE MANAGEMENT 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 0001502285 LKCM Micro-Cap Partnership, L.P. 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 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 2015-06-30 4 P 0 100 22.63 A 1038574 I See footnotes Common Stock 2015-06-30 4 P 0 1619 22.7444 A 1040193 I See footnotes This Form 4 is filed on behalf of Luther King Capital Management Corporation (LKCM), LKCM Private Discipline Master Fund, SPC (PDP), LKCM Investment Partnership, L.P. (LIP), LKCM Micro-Cap Partnership, L.P. (Micro), LKCM Core Discipline, L.P. (Core), J. Luther King, Jr. and J. Bryan King (collectively, Filing Persons). LKCM Private Discipline Management, L.P. holds the management shares of PDP, and LKCM Alternative Management, LLC (PD Alternative) is its general partner. LKCM Investment Partnership GP, LLC (LIP GP) is the general partner of LIP. LKCM Micro-Cap Management, L.P. (Micro GP) is the general partner of Micro. LKCM Core Discipline Management, L.P. (Core GP) is the general partner of Core. LKCM is the investment manager for PDP, LIP, Micro and Core. J. Luther King, Jr. is a controlling shareholder and/or member of LKCM and LIP GP. J. Luther King, Jr. and J. Bryan King are controlling members of PD Alternative, Micro GP and Core GP. Includes (i) 813,125 shares held by PDP, (ii) 200,938 shares held by LIP, (iii) 17,824 shares held by Micro, (iv) 5,806 shares held by Core, and (v) 2,500 shares held in a separately managed portfolio for which LKCM serves as investment adviser. Each of the Filing Persons hereby expressly disclaims membership in a group under the Securities Exchange Act of 1934 with respect to the securities reported herein, and this Form 4 shall not be deemed to be an admission that any such Filing Person is a member of such a group. Each of the Filing Persons hereby 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 Filing Person is the beneficial owner of the securities reported herein for purposes of the Securities Exchange Act of 1934 or for any other purpose. J. Bryan King, for Luther King Capital Management Corporation 2015-07-01 J. Bryan King, for LKCM Private Discipline Master Fund, SPC 2015-07-01 J. Luther King, Jr., for LKCM Investment Partnership, L.P. 2015-07-01 J. Bryan King, for LKCM Micro-Cap Partnership, L.P. 2015-07-01 J. Bryan King, for LKCM Core Discipline, L.P. 2015-07-01 J. Luther King, Jr. 2015-07-01 J. Bryan King 2015-07-01