X0306 4 2017-05-25 0 0000703604 LAWSON PRODUCTS INC/NEW/DE/ LAWS 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 1960661 I See footnotes Common Stock 2017-05-25 4 P 0 100 19.85 A 1960761 I See footnotes Common Stock 2017-05-25 4 P 0 697 19.8715 A 1961458 I See footnotes Common Stock 2017-05-25 4 P 0 2110 19.8571 A 1963568 I See footnotes Common Stock 2017-05-26 4 P 0 3765 19.8878 A 1967333 I See footnotes Common Stock 2017-05-26 4 P 0 3076 19.8813 A 1970409 I See footnotes Common Stock 2017-05-26 4 P 0 2505 19.8561 A 1972914 I See footnotes Common Stock 3788 D Includes (i) 1,689,358 shares held by LKCM Private Discipline Master Fund, SPC (PDP), (ii) 26,102 shares held by LKCM Micro-Cap Partnership, L.P. (Micro), (iii) 10,128 shares held by LKCM Core Discipline, L.P. (Core), and (iv) 247,326 shares held by LKCM Headwater Investments II, L.P. (HW). LKCM Private Discipline Management, L.P. holds the management shares of PDP, and LKCM Alternative Management, LLC (PDP GP) is its general partner. 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 Headwater Investments II GP, L.P. (HW GP) is the general partner of HW. Mr. King is a controlling member of PDP GP, Micro GP, Core GP and HW GP. Mr. King expressly disclaims beneficial ownership of the securities reported herein, except to the extent of his pecuniary interest therein. J. Bryan King 2017-05-26