AAON, Inc. [AAON]
AMCOL International Corporation [ACO]
AmeraMex International Inc. [AMMX.PK]
Ameron International Corporation [AMN]
Apogee Enterprises, Inc. [APOG]
Armstrong World Industries, Inc. [AWI]

Continental Materials Corporation [CUO]

Drew Industries Incorporated [DW]

Encore Energy Systems, Inc. [ENCS.PK]

Fastenal Company [FAST]

Griffon Corporation [GFF]

Headwaters Incorporated [HW]
Homasote Company [HMTC.PK]

Imperial Industries, Inc. [IPII]
International Barrier Technology Inc. [IBTGF.OB]

JPS Industries, Inc. [JPST.PK]

LSB Industries, Inc. [LXU]

Martin Marietta Materials, Inc. [MLM]
MDU Resources Group, Inc. [MDU]
Metwood, Inc. [MTWD.PK]
Moro Corporation [MRCR.PK]

NCI Building Systems, Inc. [NCS]
North American Technologies Group, Inc. [NAMC.PK]

Owens Corning [OC]

PGT, Inc. [PGTI]

Quanex Building Products Corporation [NX]

Real Goods Solar, Inc. [RSOL]
RPM International Inc. [RPM]

Sumitomo Corporation [SSUMY.PK]

TAT Technologies, Ltd. [TATTF]
Tecumseh Products Company [TECUA]
The Keller Manufacturing Company, Inc. [KMFI.PK]
The Valspar Corporation [VAL]

United States Lime & Minerals, Inc. [USLM]
USG Corporation [USG]

Vulcan Materials Company [VMC]

WaterFurnace Renewable Energy, Inc. [WFIFF.PK]