X0306 4 2012-12-17 1 0001093082 HUTTIG BUILDING PRODUCTS INC HBPLPK 0001076378 CEMEX SAB DE CV AVENIDA RICARDO MARGAIN ZOZAYA 325, COLONIA VALLE DEL CAMPESTRE SAN PEDRO GARZA GARCIA N. LEON O5 66265 MEXICO 0 0 1 0 0001100921 RUGBY GROUP LTD CEMEX HOUSE, COLDHARBOUR LANE THORPE, EGHAM SURREY X0 TW20 8TD UNITED KINGDOM 0 0 1 0 Common Stock, par value $0.01 per share 2012-12-17 4 S 0 5755940 1.10 D 0 I See Footnote This form is a joint filing by CEMEX S.A.B. de C.V. ("CEMEX") and The Rugby Group Limited ("Rugby"), each of whom is filing in its capacity as a 10% owner. The Shares were held by Rugby. As Rugby is an indirect wholly-owned subsidiary of CEMEX, CEMEX may be deemed to beneficially own the Shares. /s/ Guillermo F. Hernandez Morales, Attorney, CEMEX S.A.B. de C.V. 2012-12-18 /s/ Michael F. Egan, Vice President, The Rugby Group Limited 2012-12-18