X0306 4 2017-05-25 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 PO BOX 309GT UGLAND HOUSE, SOUTH CHURCH STREET GRAND CAYMAN E9 00000 CAYMAN ISLANDS 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 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 1 0 1 0 Common Stock 2017-05-25 4 P 0 1400 19.85 A 2216949 I See footnotes Common Stock 2017-05-25 4 P 0 100 19.85 A 2217049 I See footnotes Common Stock 2017-05-25 4 P 0 697 19.8715 A 2217746 I See footnotes Common Stock 2017-05-25 4 P 0 2110 19.8571 A 2219856 I See footnotes Common Stock 2017-05-26 4 P 0 3765 19.8878 A 2223621 I See footnotes Common Stock 2017-05-26 4 P 0 3076 19.8813 A 2226697 I See footnotes Common Stock 2017-05-26 4 P 0 2505 19.8561 A 2229202 I See footnotes This Form 4 is filed by 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), LKCM Headwater Investments II, L.P. (HW), 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, LLC (Micro GP) 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. (HW GP) is the general partner of HW. LKCM is the investment manager for PDP, LIP, Micro, Core and HW. J. Luther King, Jr. is a controlling shareholder or member, as applicable, of LCKM and LIP GP. J. Bryan King is a controlling member of HW GP and a director of the issuer. J. Luther King, Jr. and J. Bryan King are controlling members of PDP GP, Micro GP and Core 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) 247,326 shares held by HW, (vi) 2,500 shares held by a separately managed portfolio for which LKCM serves as investment adviser, and (vii) 3,788 restricted shares held by J. Bryan King. 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 purpose. J. Bryan King, for Luther King Capital Management Corporation 2017-05-26 J. Bryan King, for LKCM Private Discipline Master Fund, SPC 2017-05-26 J. Luther King, Jr., for LKCM Investment Partnership, L.P. 2017-05-26 J. Bryan King, for LKCM Micro-Cap Partnership, L.P. 2017-05-26 J. Bryan King, for LKCM Core Discipline, L.P. 2017-05-26 J. Bryan King, for LKCM Headwater Investments II, L.P. 2017-05-26 J. Luther King, Jr. 2017-05-26 J. Bryan King 2017-05-26