| Oaklee Recycling Inc (Cincinnati, OH)
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| Oakley Tube Div (Englewood, CO)
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| Oasis Supply & Trade Llc (Oklahoma City, OK)
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| O'Brien Steel Service Co (Peoria, IL)
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| Oden Enterprises (Wahoo, NE)
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| Oest Metalworks (Phoenix, AZ)
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| Ofab (Ocala, FL)
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| Ohio Knife & Grinding Co (Akron, OH)
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| Ohio Steel Trading Inc (Chagrin Falls, OH)
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| Oil City Tube Div (Oil City, PA)
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| Oilfield Pipe & Supply Inc (Dewey, OK)
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| Oilfield Pipe & Supply Inc (Glen Allen, VA)
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| Olympic Steel Co (Milford, CT)
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| Olympic Steel Co (Bedford, OH)
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| Oregon Metal Slitters (Portland, OR)
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| Oregon Steel Division (Portland, OR)
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| Osm Tubular (Portland, OR)
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| Overland Metals Inc (Saint Louis, MO)
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| Owen Steel Co (New York, NY)
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| Owensdale Scrap & Recycling (Connellsville, PA)
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| P & H Iron & Supply Inc (Hammond, IN)
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| P A Pipe Inc (Camp Hill, PA)
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| Pacific Agents (Lake Oswego, OR)
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| Pacific Coast Recycling Allway (San Diego, CA)
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| Pacific Corrugated Pipe Co (Grandview, WA)
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