- Cablevision Systems Corporation
- Cabot Oil & Gas Corporation
- Cache Incorporated
- CACI International Incorporated
- Cadbury Schweppes Plc
- Cadiz Incorporated
- Cagle's Incorporated
- Calamos Asset Management Incorporated
- California Culinary Academy Incorporated
- California Pizza Kitchen Incorporated
- Callaway Golf Company
- Cambrex Corporation
- Campbell Soup Company
- Canadian Imperial Bank of Commerce
- Canadian National Railway Company
- Canadian Natural Resources Limited
- Canadian Pacific Limited
- Canadian Pacific Railway Limited
- Canal+
- Canon Incorporated
- Canwest Global Communications Corporation
- Capital Bank Corporation
- Capital Beverage Corporation
- Capital One Financial Corporation
- CapitalSource Incorporated
- Cardinal Health Incorporated
- Career Education Corporation
- CareFirst BlueCross BlueShield
- Caremark Rx Incorporated
- CarMax Inc.
- Carmike Cinemas Incorporated
- Carnival Corporation
- Carnival Cruise Lines
- Carolco Pictures Incorporated
- Carolina National Corporation
- Carpenter Technology Corporation
- Carrollton Bancorp
- Carver Bancorp Incorporated
- Cascade Corporation
- Casual Male Retail Group Incorporated
- Caterpillar Inc.
- Cathay Pacific Airways Limited
- Cato Corporation
- Cattleman's Incorporated
- CBOT Holdings Incorporated
- CBRL Group Incorporated
- CBS Corp.
- CCA Industries Incorporated
- CDW Computer Centers Incorporated
- CEC Entertainment Incorporated
- Cedar Fair LP
- Cedar Shopping Centers
- Celanese Corporation
- Celera Genomics Group
- Celgene Corporation
- CEMEX SA
- Cendant Corporation
- Centerplate Incorporated
- CenterPoint Energy Incorporated
- Centex Corporation
- Centocor Incorporated
- Cephalon Incorporated
- Ceradyne Incorporated
- Ceridian Corporation
- CF Industries Holdings Incorporated
- CFI Incorporated
- Chamber of Commerce Building Corporation
- Champions Sports Incorporated
- Chaparral Steel Company
- Charming Shoppes Incorporated
- Charter Communications Incorporated
- Chaus Incorporated
- CheckFree Corporation
- Cheesecake Factory Incorporated (The)
- Chembio Diagnostics
- Chesapeake Energy Corporation
- Cheung Kong Limited
- Chevron Corp.
- Chicago Mercantile Exchange Holdings Incorporated
- Chicago Sun-Times
- China Life Insurance Company Limited
- China Mobile Limited
- China Unicom Limited
- Chipotle Mexican Grill Incorporated
- Chiquita Brands International Incorporated
- Chiron Corporation
- Chittenden Corporation
- Choice Hotels International Incorporated
- ChoicePoint Incorporated
- Christie's International Plc
- Chrysler LLC
- Chubb Corporation
- Church & Dwight Company Incorporated
- Churchill Downs Inc.
- Chyron Corp.
- Ciena Corporation
- Cigna Corporation
- Cintas Corporation
- Circuit City Stores Incorporated
- Cisco Systems Inc.
- CIT Group Incorporated
- Citadel Broadcasting Corporation
- Citigroup Incorporated
- Citizens Property Insurance Corp.
- Citrix Systems Incorporated
- City Bank
- City Capital Corporation
- City National Corporation
- City Savings Bank
- Cityview Corporation
- CKE Restaurants Incorporated
- Claire's Stores Incorporated
- Clark Incorporated
- Clear Channel Communications Inc.
- Clear Channel Outdoor Holdings Incorporated
- Cleco Corporation
- Cleveland-Cliffs Incorporated
- Click Commerce Incorporated
- CMGI Incorporated
- CMS Energy Corporation
- CNA Financial Corporation
- CNH Global NV
- CNL Financial Corporation
- Coach Incorporated
- Coastal Financial Corporation
- Cobra Electronics Corporation
- Coca-Cola Company
- Coca-Cola Enterprises Incorporated
- Coherent Incorporated
- Cohu Incorporated
- Coinmach Service
- Coinstar Incorporated
- Coldwater Creek Incorporated
- Coley Pharmaceutical Group Incorporated
- Colgate-Palmolive Company
- Colonial Properties Trust
- Columbia Management Company
- Columbia Sportswear Company
- Comcast Corp.
- Comerica Incorporated
- COMFORCE Corporation
- Commerce Bancorp Incorporated
- Communications Systems Incorporated
- Community Bancorp Incorporated
- Community Banks Incorporated
- Community Financial Corporation
- Community Health Systems Incorporated
- Companhia de Bebidas das Americas
- Companhia Siderurgica Nacional
- Companhia Vale do Rio Doce
- Compaq Computer Corporation
- Compass Bancshares Incorporated
- Comprehensive Health
- CompuDyne Corporation
- Computer Associates
- Computer Sciences Corporation
- Compuware Corporation
- Comtech Telecommunications Corp.
- Comverse Technology Incorporated
- ConAgra Foods Incorporated
- Conair Corporation
- Connecticut Center for Advanced Technology, Inc.
- Connecticut Light & Power Company
- Connecticut Natural Gas Corporation
- Connecticut River
- ConocoPhillips
- Conseco Incorporated
- Consolidated Edison Incorporated
- Consolidated Water Company Limited
- Consolidated-Tomoka Land Company
- Constellation Brands Incorporated
- Constellation Energy Group
- Consumers Energy Company
- Continental Airlines Incorporated
- Continental Bank
- Convergys Corporation
- Cooper Cameron Corporation
- Cooper Industries Incorporated
- Corinthian Colleges Incorporated
- Corn Products International Incorporated
- Corning Incorporated
- Corporate Office Properties Trust Incorporated
- Corporate Office Properties Trust.
- Corrections Corporation of America
- Corus Group Plc
- Cosmetic Center Incorporated
- CoStar Group Incorporated
- Costco Wholesale Corporation
- Country Bank
- Countrywide Financial Corp.
- County Bank Corporation
- Covad Communications Group Incorporated
- Coventry Health Care Incorporated
- Cox Radio Incorporated
- CPI Aerostructures
- Crane Company
- Crawford & Company
- Creative Technology Limited
- Credit Suisse Group
- Crocs Incorporated
- Crown Books Corporation
- Crown Castle International Corporation
- Crown Cork & Seal Company Incorporated
- Cryptologic Incorporated
- CSX Corporation
- Cubic Corporation
- Cummins Incorporated
- Curtiss-Wright Corporation
- Cutter & Buck Incorporated
- CVD Equipment
- CVS Corporation
- Cyberonics Incorporated
- Cypress Semiconductor Corporation