UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549  FORM N-Q QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY _______________________________ Investment Company Act file number  811-06071 DWS Institutional Funds (Exact name of registrant as specified in charter)  345 Park Avenue New York, NY  10154 (Address of principal executive offices)             (Zip code)  Paul Schubert 345 Park Avenue New York, NY  10154-0004 (Name and address of agent for service) Registrant's telephone number, including area code:(212) 454-7190 Date of fiscal year end:12/31 Date of reporting period:9/30/09  ITEM 1.  SCHEDULE OF INVESTMENTS  Investment Portfolio
        as of September 30, 2009  (Unaudited)
  DWS Equity 500 Index Fund DWS Equity 500 Index Fund  (the Fund) is a feeder fund that invests substantially all of its assets in a master portfolio, the DWS Equity 500 Index Portfolio (the Portfolio) and owns a pro rata interest in the Portfolios net assets.  At September 30, 2009, the Fund owned approximately 79% of the Portfolios outstanding interests. The Portfolios Schedule of Investments is set forth below.  Shares
        
        Value ($)Common Stocks 99.4%Consumer Discretionary 9.1%Auto Components 0.2%Goodyear Tire & Rubber Co.*
        
        62,896
        
        1,071,119Johnson Controls, Inc. (a)
        
        150,637
        
        3,850,2814,921,400Automobiles 0.3%Ford Motor Co.* (a)
        
        818,471
        
        5,901,176Harley-Davidson, Inc. (a)
        
        58,182
        
        1,338,1867,239,362Distributors 0.1%Genuine Parts Co.
        
        41,478
        
        1,578,653
    Diversified Consumer Services 0.2%Apollo Group, Inc. "A"* (a)
        
        28,183
        
        2,076,242DeVry, Inc. (a)
        
        16,700
        
        923,844H&R Block, Inc.
        
        86,582
        
        1,591,3774,591,463Hotels Restaurants & Leisure 1.5%Carnival Corp. (Units)
        
        111,379
        
        3,706,693Darden Restaurants, Inc.
        
        36,280
        
        1,238,236International Game Technology
        
        77,064
        
        1,655,335Marriott International, Inc. "A"
        
        63,816
        
        1,760,683McDonald's Corp.
        
        276,262
        
        15,766,272Starbucks Corp.*
        
        186,501
        
        3,851,246Starwood Hotels & Resorts Worldwide, Inc. (a)
        
        48,812
        
        1,612,260Wyndham Worldwide Corp.
        
        45,314
        
        739,525Wynn Resorts Ltd.* (a)
        
        17,600
        
        1,247,664Yum! Brands, Inc.
        
        117,131
        
        3,954,34335,532,257Household Durables 0.4%Black & Decker Corp. (a)
        
        15,652
        
        724,531D.R. Horton, Inc. (a)
        
        73,100
        
        834,071Fortune Brands, Inc.
        
        38,254
        
        1,644,157Harman International Industries, Inc.
        
        15,300
        
        518,364KB HOME (a)
        
        20,472
        
        340,040Leggett & Platt, Inc.
        
        38,970
        
        756,018Lennar Corp. "A"
        
        39,900
        
        568,575Newell Rubbermaid, Inc. (a)
        
        68,350
        
        1,072,411Pulte Homes, Inc. (a)
        
        81,997
        
        901,147Whirlpool Corp. (a)
        
        19,477
        
        1,362,6118,721,925Internet & Catalog Retail 0.4%Amazon.com, Inc.* (a)
        
        84,412
        
        7,880,704Expedia, Inc.*
        
        53,670
        
        1,285,3979,166,101Leisure Equipment & Products 0.1%Eastman Kodak Co. (a)
        
        71,031
        
        339,528Hasbro, Inc.
        
        34,402
        
        954,656Mattel, Inc.
        
        90,814
        
        1,676,4262,970,610Media 2.6%CBS Corp. "B" (a)
        
        175,054
        
        2,109,401Comcast Corp. "A" (a)
        
        727,055
        
        12,279,959Gannett Co., Inc. (a)
        
        57,969
        
        725,192Interpublic Group of Companies, Inc.*
        
        117,695
        
        885,066McGraw-Hill Companies, Inc. (a)
        
        81,774
        
        2,055,798Meredith Corp.
        
        10,038
        
        300,538New York Times Co. "A" (a)
        
        37,073
        
        301,033News Corp. "A"
        
        569,949
        
        6,833,689Omnicom Group, Inc. (a)
        
        80,136
        
        2,960,224Scripps Networks Interactive "A"
        
        23,100
        
        853,545The DIRECTV Group, Inc.* (a)
        
        113,268
        
        3,123,931Time Warner Cable, Inc.
        
        89,975
        
        3,877,023Time Warner, Inc. (a)
        
        300,967
        
        8,661,830Viacom, Inc. "B"*
        
        153,553
        
        4,305,626Walt Disney Co. (a)
        
        470,996
        
        12,933,550
    Washington Post Co. "B"
        
        1,500
        
        702,12062,908,525Multiline Retail 0.9%Big Lots, Inc.*
        
        21,496
        
        537,830Family Dollar Stores, Inc.
        
        35,172
        
        928,541J.C. Penney Co., Inc.
        
        57,475
        
        1,939,781Kohl's Corp.*
        
        77,665
        
        4,430,788Macy's, Inc. (a)
        
        108,550
        
        1,985,380Nordstrom, Inc. (a)
        
        41,332
        
        1,262,279Sears Holdings Corp.* (a)
        
        12,818
        
        837,144Target Corp. (a)
        
        191,259
        
        8,927,97020,849,713Specialty Retail 1.9%Abercrombie & Fitch Co. "A" (a)
        
        22,700
        
        746,376AutoNation, Inc.* (a)
        
        22,500
        
        406,800AutoZone, Inc.*
        
        8,110
        
        1,185,844Bed Bath & Beyond, Inc.*
        
        67,266
        
        2,525,166Best Buy Co., Inc. (a)
        
        86,131
        
        3,231,635GameStop Corp. "A"* (a)
        
        41,500
        
        1,098,505Home Depot, Inc. (a)
        
        431,818
        
        11,503,632Limited Brands, Inc.
        
        70,311
        
        1,194,584Lowe's Companies, Inc.
        
        375,197
        
        7,856,625O'Reilly Automotive, Inc.* (a)
        
        35,700
        
        1,290,198Office Depot, Inc.*
        
        69,059
        
        457,171RadioShack Corp.
        
        32,495
        
        538,442Staples, Inc.
        
        182,074
        
        4,227,758The Gap, Inc.
        
        119,558
        
        2,558,541The Sherwin-Williams Co. (a)
        
        25,205
        
        1,516,333Tiffany & Co.
        
        31,716
        
        1,222,017TJX Companies, Inc.
        
        107,499
        
        3,993,58845,553,215Textiles, Apparel & Luxury Goods 0.5%Coach, Inc.
        
        82,600
        
        2,719,192NIKE, Inc. "B" (a)
        
        98,803
        
        6,392,554Polo Ralph Lauren Corp.
        
        14,700
        
        1,126,314VF Corp. (a)
        
        22,140
        
        1,603,60011,841,660Consumer Staples 11.5%Beverages 2.7%Brown-Forman Corp. "B"
        
        25,522
        
        1,230,671Coca-Cola Co. (a)
        
        587,925
        
        31,571,573Coca-Cola Enterprises, Inc.
        
        81,424
        
        1,743,288Constellation Brands, Inc. "A"*
        
        49,400
        
        748,410Dr. Pepper Snapple Group, Inc.*
        
        62,797
        
        1,805,414Molson Coors Brewing Co. "B"
        
        38,804
        
        1,888,979Pepsi Bottling Group, Inc.
        
        35,362
        
        1,288,591PepsiCo, Inc.
        
        395,378
        
        23,192,87363,469,799Food & Staples Retailing 2.8%Costco Wholesale Corp. (a)
        
        110,634
        
        6,246,396CVS Caremark Corp.
        
        366,398
        
        13,095,065Kroger Co.
        
        164,827
        
        3,402,029Safeway, Inc.
        
        105,959
        
        2,089,512
    SUPERVALU, Inc.
        
        53,391
        
        804,068Sysco Corp.
        
        150,282
        
        3,734,508Wal-Mart Stores, Inc.
        
        547,848
        
        26,893,858Walgreen Co.
        
        251,709
        
        9,431,536Whole Foods Market, Inc.* (a)
        
        35,200
        
        1,073,24866,770,220Food Products 1.6%Archer-Daniels-Midland Co. (a)
        
        163,378
        
        4,773,905Campbell Soup Co.
        
        48,570
        
        1,584,353ConAgra Foods, Inc.
        
        111,673
        
        2,421,071Dean Foods Co.*
        
        46,500
        
        827,235General Mills, Inc.
        
        82,768
        
        5,328,604H.J. Heinz Co.
        
        79,340
        
        3,153,765Hormel Foods Corp. (a)
        
        17,900
        
        635,808Kellogg Co.
        
        65,134
        
        3,206,547Kraft Foods, Inc. "A"
        
        374,761
        
        9,844,972McCormick & Co., Inc. (a)
        
        33,700
        
        1,143,778Sara Lee Corp.
        
        180,539
        
        2,011,204The Hershey Co. (a)
        
        42,160
        
        1,638,338The J.M. Smucker Co.
        
        29,757
        
        1,577,419Tyson Foods, Inc. "A" (a)
        
        75,400
        
        952,30239,099,301Household Products 2.6%Clorox Co. (a)
        
        35,632
        
        2,095,874Colgate-Palmolive Co. (a)
        
        126,391
        
        9,641,105Kimberly-Clark Corp.
        
        104,816
        
        6,182,048Procter & Gamble Co. (a)
        
        740,799
        
        42,907,07860,826,105Personal Products 0.2%Avon Products, Inc.
        
        108,797
        
        3,694,746Estee Lauder Companies, Inc. "A"
        
        28,900
        
        1,071,6124,766,358Tobacco 1.6%Altria Group, Inc.
        
        523,772
        
        9,328,379Lorillard, Inc.
        
        42,154
        
        3,132,042Philip Morris International, Inc.
        
        491,062
        
        23,934,362Reynolds American, Inc.
        
        42,690
        
        1,900,55938,295,342Energy 11.6%Energy Equipment & Services 1.9%Baker Hughes, Inc. (a)
        
        79,205
        
        3,378,885BJ Services Co. (a)
        
        72,728
        
        1,413,105Cameron International Corp.*
        
        56,100
        
        2,121,702Diamond Offshore Drilling, Inc. (a)
        
        17,530
        
        1,674,466ENSCO International, Inc.
        
        36,600
        
        1,556,964FMC Technologies, Inc.*
        
        30,906
        
        1,614,529Halliburton Co.
        
        229,367
        
        6,220,433Nabors Industries Ltd.*
        
        71,938
        
        1,503,504National-Oilwell Varco, Inc.*
        
        106,380
        
        4,588,169Rowan Companies, Inc.
        
        27,539
        
        635,325Schlumberger Ltd.
        
        303,921
        
        18,113,692Smith International, Inc.
        
        56,500
        
        1,621,55044,442,324
    Oil, Gas & Consumable Fuels 9.7%Anadarko Petroleum Corp. (a)
        
        125,368
        
        7,864,335Apache Corp.
        
        85,478
        
        7,849,445Cabot Oil & Gas Corp.
        
        25,700
        
        918,775Chesapeake Energy Corp.
        
        149,300
        
        4,240,120Chevron Corp.
        
        508,849
        
        35,838,235ConocoPhillips
        
        377,697
        
        17,056,797CONSOL Energy, Inc. (a)
        
        45,393
        
        2,047,678Denbury Resources, Inc.* (a)
        
        65,600
        
        992,528Devon Energy Corp.
        
        113,222
        
        7,623,237El Paso Corp.
        
        180,398
        
        1,861,707EOG Resources, Inc.
        
        63,875
        
        5,334,201ExxonMobil Corp.
        
        1,219,166
        
        83,646,979Hess Corp.
        
        73,965
        
        3,954,169Marathon Oil Corp.
        
        180,297
        
        5,751,474Massey Energy Co.
        
        21,100
        
        588,479Murphy Oil Corp.
        
        49,200
        
        2,832,444Noble Energy, Inc.
        
        44,700
        
        2,948,412Occidental Petroleum Corp.
        
        205,875
        
        16,140,600Peabody Energy Corp.
        
        66,831
        
        2,487,450Pioneer Natural Resources Co.
        
        29,600
        
        1,074,184Range Resources Corp. (a)
        
        40,242
        
        1,986,345Southwestern Energy Co.*
        
        87,036
        
        3,714,697Spectra Energy Corp.
        
        161,173
        
        3,052,617Sunoco, Inc.
        
        29,272
        
        832,788Tesoro Corp. (a)
        
        34,500
        
        516,810Valero Energy Corp.
        
        142,401
        
        2,761,155Williams Companies, Inc.
        
        148,723
        
        2,657,680XTO Energy, Inc.
        
        148,361
        
        6,130,277232,703,618Financials 15.1%Capital Markets 3.1%Ameriprise Financial, Inc.
        
        66,608
        
        2,419,869Bank of New York Mellon Corp.
        
        306,280
        
        8,879,057Charles Schwab Corp.
        
        244,233
        
        4,677,062E*TRADE Financial Corp.* (a)
        
        240,129
        
        420,226Federated Investors, Inc. "B" (a)
        
        21,700
        
        572,229Franklin Resources, Inc. (a)
        
        38,313
        
        3,854,288Invesco Ltd.
        
        106,181
        
        2,416,679Janus Capital Group, Inc.
        
        39,279
        
        556,976Legg Mason, Inc. (a)
        
        36,200
        
        1,123,286Morgan Stanley
        
        345,868
        
        10,680,404Northern Trust Corp.
        
        62,605
        
        3,641,107State Street Corp. (a)
        
        126,137
        
        6,634,806T. Rowe Price Group, Inc. (a)
        
        64,476
        
        2,946,553The Goldman Sachs Group, Inc.
        
        129,886
        
        23,944,48472,767,026Commercial Banks 2.8%BB&T Corp.
        
        173,592
        
        4,728,646Comerica, Inc.
        
        38,557
        
        1,143,986Fifth Third Bancorp. (a)
        
        199,091
        
        2,016,792First Horizon National Corp.
        
        52,547
        
        695,203Huntington Bancshares, Inc.
        
        137,396
        
        647,135KeyCorp
        
        229,183
        
        1,489,690
    M&T Bank Corp.
        
        20,400
        
        1,271,328Marshall & Ilsley Corp.
        
        92,053
        
        742,868PNC Financial Services Group, Inc. (a)
        
        117,806
        
        5,724,194Regions Financial Corp. (a)
        
        300,919
        
        1,868,707SunTrust Banks, Inc.
        
        125,692
        
        2,834,355US Bancorp. (a)
        
        486,604
        
        10,637,163Wells Fargo & Co. (a)
        
        1,185,655
        
        33,411,758Zions Bancorp. (a)
        
        27,956
        
        502,36967,714,194Consumer Finance 0.7%American Express Co. (a)
        
        302,385
        
        10,250,852Capital One Financial Corp. (a)
        
        117,543
        
        4,199,811Discover Financial Services
        
        123,032
        
        1,996,809SLM Corp.* (a)
        
        121,565
        
        1,060,04717,507,519Diversified Financial Services 4.6%Bank of America Corp.
        
        2,195,987
        
        37,156,100Citigroup, Inc.
        
        3,314,167
        
        16,040,568CME Group, Inc.
        
        16,873
        
        5,200,090IntercontinentalExchange, Inc.* (a)
        
        18,348
        
        1,783,242JPMorgan Chase & Co.
        
        998,274
        
        43,744,367Leucadia National Corp.*
        
        45,200
        
        1,117,344Moody's Corp. (a)
        
        49,800
        
        1,018,908NYSE Euronext (a)
        
        67,500
        
        1,950,075The NASDAQ OMX Group, Inc.*
        
        35,500
        
        747,275108,757,969Insurance 2.7%Aflac, Inc. (a)
        
        119,627
        
        5,112,858Allstate Corp.
        
        137,251
        
        4,202,626American International Group, Inc.* (a)
        
        33,961
        
        1,498,020Aon Corp. (a)
        
        72,987
        
        2,969,841Assurant, Inc.
        
        28,900
        
        926,534Chubb Corp. (a)
        
        89,259
        
        4,499,546Cincinnati Financial Corp.
        
        42,934
        
        1,115,855Genworth Financial, Inc. "A"
        
        121,300
        
        1,449,535Hartford Financial Services Group, Inc. (a)
        
        97,402
        
        2,581,153Lincoln National Corp.
        
        66,374
        
        1,719,750Loews Corp.
        
        92,523
        
        3,168,913Marsh & McLennan Companies, Inc.
        
        136,532
        
        3,376,436MBIA, Inc.* (a)
        
        37,475
        
        290,806MetLife, Inc.
        
        209,315
        
        7,968,622Principal Financial Group, Inc.
        
        81,519
        
        2,232,805Progressive Corp.*
        
        171,014
        
        2,835,412Prudential Financial, Inc.
        
        118,015
        
        5,890,129The Travelers Companies, Inc.
        
        144,465
        
        7,112,012Torchmark Corp.
        
        22,310
        
        968,923Unum Group
        
        84,494
        
        1,811,551XL Capital Ltd. "A"
        
        85,732
        
        1,496,88163,228,208Real Estate Investment Trusts 1.1%Apartment Investment & Management Co. "A" (REIT) (a)
        
        34,816
        
        513,536AvalonBay Communities, Inc. (REIT)
        
        20,846
        
        1,516,130Boston Properties, Inc. (REIT) (a)
        
        36,000
        
        2,359,800Equity Residential (REIT) (a)
        
        70,860
        
        2,175,402
    HCP, Inc. (REIT) (a)
        
        69,455
        
        1,996,137Health Care REIT, Inc. (REIT) (a)
        
        27,600
        
        1,148,712Host Hotels & Resorts, Inc. (REIT)
        
        155,500
        
        1,830,235Kimco Realty Corp. (REIT)
        
        82,400
        
        1,074,496Plum Creek Timber Co., Inc. (REIT) (a)
        
        43,324
        
        1,327,447ProLogis (REIT)
        
        113,700
        
        1,355,304Public Storage (REIT) (a)
        
        34,530
        
        2,598,037Simon Property Group, Inc. (REIT) (a)
        
        72,715
        
        5,048,602Ventas, Inc. (REIT)
        
        39,600
        
        1,524,600Vornado Realty Trust (REIT) (a)
        
        39,928
        
        2,571,76327,040,201Real Estate Management & Development 0.0%CB Richard Ellis Group, Inc. "A"*
        
        59,600
        
        699,704Thrifts & Mortgage Finance 0.1%Hudson City Bancorp., Inc.
        
        121,168
        
        1,593,359People's United Financial, Inc.
        
        94,100
        
        1,464,1963,057,555Health Care 13.0%Biotechnology 1.7%Amgen, Inc.*
        
        257,469
        
        15,507,358Biogen Idec, Inc.*
        
        73,603
        
        3,718,423Celgene Corp.*
        
        116,681
        
        6,522,468Cephalon, Inc.* (a)
        
        18,700
        
        1,089,088Genzyme Corp.* (a)
        
        68,384
        
        3,879,424Gilead Sciences, Inc.*
        
        229,639
        
        10,696,58541,413,346Health Care Equipment & Supplies 2.0%Baxter International, Inc.
        
        153,125
        
        8,729,656Becton, Dickinson & Co. (a)
        
        60,871
        
        4,245,752Boston Scientific Corp.*
        
        383,243
        
        4,058,544C.R. Bard, Inc.
        
        25,594
        
        2,011,944CareFusion Corp.*
        
        46,834
        
        1,020,981DENTSPLY International, Inc. (a)
        
        38,600
        
        1,333,244Hospira, Inc.*
        
        40,422
        
        1,802,821Intuitive Surgical, Inc.*
        
        9,800
        
        2,570,050Medtronic, Inc.
        
        281,709
        
        10,366,891St. Jude Medical, Inc.*
        
        87,910
        
        3,429,369Stryker Corp. (a)
        
        62,848
        
        2,855,185Varian Medical Systems, Inc.* (a)
        
        31,300
        
        1,318,669Zimmer Holdings, Inc.*
        
        55,908
        
        2,988,28346,731,389Health Care Providers & Services 2.0%Aetna, Inc.
        
        111,495
        
        3,102,906AmerisourceBergen Corp.
        
        76,010
        
        1,701,104Cardinal Health, Inc.
        
        93,668
        
        2,510,302CIGNA Corp.
        
        70,575
        
        1,982,452Coventry Health Care, Inc.*
        
        38,758
        
        773,610DaVita, Inc.*
        
        26,600
        
        1,506,624Express Scripts, Inc.*
        
        69,517
        
        5,393,129Humana, Inc.* (a)
        
        43,351
        
        1,616,992Laboratory Corp. of America Holdings*
        
        26,300
        
        1,727,910McKesson Corp.
        
        67,667
        
        4,029,570Medco Health Solutions, Inc.*
        
        120,976
        
        6,691,183
    Patterson Companies, Inc.*
        
        23,800
        
        648,550Quest Diagnostics, Inc.
        
        38,402
        
        2,004,200Tenet Healthcare Corp.*
        
        117,448
        
        690,594UnitedHealth Group, Inc.
        
        295,410
        
        7,397,066WellPoint, Inc.*
        
        120,796
        
        5,720,89947,497,091Health Care Technology 0.0%IMS Health, Inc.
        
        48,206
        
        739,962Life Sciences Tools & Services 0.4%Life Technologies Corp.*
        
        45,103
        
        2,099,545Millipore Corp.*
        
        13,681
        
        962,185PerkinElmer, Inc. (a)
        
        30,063
        
        578,412Thermo Fisher Scientific, Inc.* (a)
        
        104,780
        
        4,575,743Waters Corp.*
        
        24,805
        
        1,385,6079,601,492Pharmaceuticals 6.9%Abbott Laboratories
        
        392,382
        
        19,411,137Allergan, Inc.
        
        78,424
        
        4,451,346Bristol-Myers Squibb Co.
        
        501,722
        
        11,298,779Eli Lilly & Co. (a)
        
        256,362
        
        8,467,637Forest Laboratories, Inc.*
        
        78,681
        
        2,316,369Johnson & Johnson (a)
        
        699,204
        
        42,574,532King Pharmaceuticals, Inc.* (a)
        
        61,575
        
        663,163Merck & Co., Inc. (a)
        
        534,825
        
        16,916,515Mylan, Inc.* (a)
        
        77,300
        
        1,237,573Pfizer, Inc. (a)
        
        1,712,171
        
        28,336,430Schering-Plough Corp.
        
        414,971
        
        11,722,931Watson Pharmaceuticals, Inc.*
        
        25,907
        
        949,232Wyeth
        
        338,481
        
        16,443,407164,789,051Industrials 10.2%Aerospace & Defense 2.7%Boeing Co. (a)
        
        184,493
        
        9,990,296General Dynamics Corp.
        
        98,018
        
        6,331,963Goodrich Corp.
        
        31,238
        
        1,697,473Honeywell International, Inc.
        
        190,783
        
        7,087,588ITT Corp.
        
        46,592
        
        2,429,773L-3 Communications Holdings, Inc.
        
        29,368
        
        2,358,838Lockheed Martin Corp.
        
        82,032
        
        6,405,059Northrop Grumman Corp. (a)
        
        81,122
        
        4,198,064Precision Castparts Corp.
        
        35,228
        
        3,588,676Raytheon Co.
        
        97,953
        
        4,698,805Rockwell Collins, Inc.
        
        40,144
        
        2,039,315United Technologies Corp.
        
        238,440
        
        14,528,14965,353,999Air Freight & Logistics 1.0%C.H. Robinson Worldwide, Inc.
        
        42,432
        
        2,450,448Expeditors International of Washington, Inc.
        
        54,200
        
        1,905,130FedEx Corp.
        
        79,496
        
        5,979,689United Parcel Service, Inc. "B"
        
        252,099
        
        14,236,03124,571,298Airlines 0.1%Southwest Airlines Co. (a)
        
        193,891
        
        1,861,354
    Building Products 0.1%Masco Corp.
        
        91,805
        
        1,186,121Commercial Services & Supplies 0.5%Avery Dennison Corp. (a)
        
        27,531
        
        991,391Cintas Corp.
        
        32,666
        
        990,107Iron Mountain, Inc.* (a)
        
        46,400
        
        1,237,024Pitney Bowes, Inc.
        
        52,685
        
        1,309,222R.R. Donnelley & Sons Co.
        
        50,961
        
        1,083,431Republic Services, Inc.
        
        83,699
        
        2,223,882Stericycle, Inc.* (a)
        
        20,200
        
        978,690Waste Management, Inc. (a)
        
        124,607
        
        3,715,78112,529,528Construction & Engineering 0.2%Fluor Corp.
        
        44,750
        
        2,275,538Jacobs Engineering Group, Inc.*
        
        32,100
        
        1,474,995Quanta Services, Inc.*
        
        51,300
        
        1,135,2694,885,802Electrical Equipment 0.4%Emerson Electric Co. (a)
        
        191,002
        
        7,655,360Rockwell Automation, Inc. (a)
        
        35,021
        
        1,491,8959,147,255Industrial Conglomerates 2.5%3M Co. (a)
        
        177,329
        
        13,086,880General Electric Co. (a)
        
        2,698,408
        
        44,307,859Textron, Inc. (a)
        
        67,754
        
        1,285,97158,680,710Machinery 1.6%Caterpillar, Inc. (a)
        
        156,468
        
        8,031,502Cummins, Inc.
        
        51,992
        
        2,329,761Danaher Corp.
        
        65,538
        
        4,412,018Deere & Co. (a)
        
        107,578
        
        4,617,248Dover Corp.
        
        46,272
        
        1,793,503Eaton Corp.
        
        43,054
        
        2,436,426Flowserve Corp.
        
        14,700
        
        1,448,538Illinois Tool Works, Inc.
        
        97,796
        
        4,176,867PACCAR, Inc. (a)
        
        91,781
        
        3,461,061Pall Corp.
        
        31,010
        
        1,001,003Parker Hannifin Corp.
        
        41,252
        
        2,138,504Snap-on, Inc.
        
        14,732
        
        512,084The Stanley Works
        
        18,653
        
        796,29737,154,812Professional Services 0.1%Dun & Bradstreet Corp.
        
        14,000
        
        1,054,480Equifax, Inc.
        
        32,709
        
        953,140Monster Worldwide, Inc.* (a)
        
        31,489
        
        550,428Robert Half International, Inc.
        
        40,275
        
        1,007,6803,565,728Road & Rail 0.9%Burlington Northern Santa Fe Corp.
        
        66,236
        
        5,287,620CSX Corp.
        
        99,430
        
        4,162,140Norfolk Southern Corp.
        
        93,463
        
        4,029,190Ryder System, Inc.
        
        14,590
        
        569,885
    Union Pacific Corp.
        
        127,926
        
        7,464,48221,513,317Trading Companies & Distributors 0.1%Fastenal Co. (a)
        
        33,100
        
        1,280,970W.W. Grainger, Inc. (a)
        
        16,362
        
        1,462,1082,743,078Information Technology 18.5%Communications Equipment 2.7%Ciena Corp.*
        
        21,498
        
        349,987Cisco Systems, Inc.*
        
        1,463,351
        
        34,447,282Harris Corp.
        
        33,900
        
        1,274,640JDS Uniphase Corp.*
        
        55,939
        
        397,726Juniper Networks, Inc.* (a)
        
        133,134
        
        3,597,281Motorola, Inc.
        
        585,303
        
        5,027,753QUALCOMM, Inc.
        
        421,906
        
        18,977,332Tellabs, Inc.*
        
        104,030
        
        719,88864,791,889Computers & Peripherals 5.7%Apple, Inc.*
        
        227,278
        
        42,130,523Dell, Inc.*
        
        437,532
        
        6,676,738EMC Corp.*
        
        513,932
        
        8,757,401Hewlett-Packard Co.
        
        601,312
        
        28,387,940International Business Machines Corp. (a)
        
        332,286
        
        39,744,728Lexmark International, Inc. "A"*
        
        20,257
        
        436,336NetApp, Inc.*
        
        84,609
        
        2,257,368QLogic Corp.*
        
        31,000
        
        533,200SanDisk Corp.* (a)
        
        58,000
        
        1,258,600Sun Microsystems, Inc.*
        
        193,291
        
        1,757,015Teradata Corp.*
        
        45,298
        
        1,246,601Western Digital Corp.*
        
        55,735
        
        2,036,000135,222,450Electronic Equipment, Instruments & Components 0.5%Agilent Technologies, Inc.*
        
        86,157
        
        2,397,749Amphenol Corp. "A"
        
        42,330
        
        1,594,994Corning, Inc. (a)
        
        395,151
        
        6,049,762FLIR Systems, Inc.*
        
        37,900
        
        1,060,063Jabil Circuit, Inc.
        
        50,875
        
        682,234Molex, Inc.
        
        35,886
        
        749,30012,534,102Internet Software & Services 1.8%Akamai Technologies, Inc.* (a)
        
        44,200
        
        869,856eBay, Inc.*
        
        281,032
        
        6,635,165Google, Inc. "A"* (a)
        
        61,035
        
        30,264,205VeriSign, Inc.*
        
        50,000
        
        1,184,500Yahoo!, Inc.*
        
        303,402
        
        5,403,59044,357,316IT Services 1.1%Affiliated Computer Services, Inc. "A"*
        
        25,300
        
        1,370,501Automatic Data Processing, Inc.
        
        127,370
        
        5,005,641Cognizant Technology Solutions Corp. "A"*
        
        73,422
        
        2,838,494Computer Sciences Corp.* (a)
        
        38,643
        
        2,036,873Convergys Corp.*
        
        33,540
        
        333,388Fidelity National Information Services, Inc.
        
        47,500
        
        1,211,725Fiserv, Inc.*
        
        39,205
        
        1,889,681
    MasterCard, Inc. "A" (a)
        
        22,600
        
        4,568,590Paychex, Inc. (a)
        
        80,001
        
        2,324,029Total System Services, Inc.
        
        47,866
        
        771,121Western Union Co.
        
        180,396
        
        3,413,09225,763,135Office Electronics 0.1%Xerox Corp.
        
        222,156
        
        1,719,488Semiconductors & Semiconductor Equipment 2.6%Advanced Micro Devices, Inc.* (a)
        
        142,097
        
        804,269Altera Corp. (a)
        
        76,743
        
        1,573,999Analog Devices, Inc.
        
        74,568
        
        2,056,585Applied Materials, Inc.
        
        339,504
        
        4,549,354Broadcom Corp. "A"*
        
        110,083
        
        3,378,447Intel Corp.
        
        1,418,796
        
        27,765,838KLA-Tencor Corp. (a)
        
        43,885
        
        1,573,716Linear Technology Corp. (a)
        
        57,006
        
        1,575,076LSI Corp.*
        
        165,055
        
        906,152MEMC Electronic Materials, Inc.*
        
        57,600
        
        957,888Microchip Technology, Inc.
        
        46,600
        
        1,234,900Micron Technology, Inc.*
        
        217,049
        
        1,779,802National Semiconductor Corp.
        
        50,366
        
        718,723Novellus Systems, Inc.*
        
        25,082
        
        526,220NVIDIA Corp.*
        
        138,743
        
        2,085,307Teradyne, Inc.* (a)
        
        43,358
        
        401,062Texas Instruments, Inc.
        
        319,576
        
        7,570,755Xilinx, Inc. (a)
        
        70,403
        
        1,648,83861,106,931Software 4.0%Adobe Systems, Inc.*
        
        133,144
        
        4,399,078Autodesk, Inc.*
        
        58,348
        
        1,388,682BMC Software, Inc.*
        
        48,069
        
        1,804,030CA, Inc. (a)
        
        100,115
        
        2,201,529Citrix Systems, Inc.* (a)
        
        45,914
        
        1,801,206Compuware Corp.*
        
        59,252
        
        434,317Electronic Arts, Inc.*
        
        84,006
        
        1,600,314Intuit, Inc.* (a)
        
        83,566
        
        2,381,631McAfee, Inc.*
        
        39,600
        
        1,734,084Microsoft Corp. (a)
        
        1,966,088
        
        50,902,018Novell, Inc.*
        
        87,582
        
        394,995Oracle Corp.
        
        989,629
        
        20,623,868Red Hat, Inc.*
        
        46,493
        
        1,285,067Salesforce.com, Inc.* (a)
        
        27,100
        
        1,542,803Symantec Corp.*
        
        206,464
        
        3,400,46295,894,084Materials 3.5%Chemicals 2.0%Air Products & Chemicals, Inc.
        
        54,390
        
        4,219,576Airgas, Inc.
        
        21,250
        
        1,027,863CF Industries Holdings, Inc.
        
        12,135
        
        1,046,401Dow Chemical Co. (a)
        
        290,847
        
        7,582,381E.I. du Pont de Nemours & Co. (a)
        
        230,030
        
        7,393,164Eastman Chemical Co.
        
        18,669
        
        999,538Ecolab, Inc.
        
        51,042
        
        2,359,672FMC Corp.
        
        19,200
        
        1,080,000
    International Flavors & Fragrances, Inc.
        
        19,916
        
        755,414Monsanto Co.
        
        139,039
        
        10,761,619PPG Industries, Inc. (a)
        
        41,662
        
        2,425,145Praxair, Inc.
        
        78,202
        
        6,388,321Sigma-Aldrich Corp.
        
        30,716
        
        1,658,05047,697,144Construction Materials 0.1%Vulcan Materials Co. (a)
        
        31,176
        
        1,685,686Containers & Packaging 0.2%Ball Corp.
        
        24,224
        
        1,191,821Bemis Co., Inc.
        
        25,930
        
        671,846Owens-Illinois, Inc.*
        
        43,400
        
        1,601,460Pactiv Corp.*
        
        33,149
        
        863,532Sealed Air Corp.
        
        40,872
        
        802,3175,130,976Metals & Mining 1.0%AK Steel Holding Corp. (a)
        
        29,600
        
        584,008Alcoa, Inc. (a)
        
        245,938
        
        3,226,707Allegheny Technologies, Inc. (a)
        
        24,379
        
        853,021Freeport-McMoRan Copper & Gold, Inc. (a)
        
        104,751
        
        7,186,966Newmont Mining Corp.
        
        124,305
        
        5,471,906Nucor Corp.
        
        79,599
        
        3,741,949Titanium Metals Corp. (a)
        
        22,200
        
        212,898United States Steel Corp. (a)
        
        37,792
        
        1,676,83122,954,286Paper & Forest Products 0.2%International Paper Co.
        
        109,712
        
        2,438,898MeadWestvaco Corp.
        
        45,844
        
        1,022,779Weyerhaeuser Co. (a)
        
        54,929
        
        2,013,1485,474,825Telecommunication Services 3.2%Diversified Telecommunication Services 2.9%AT&T, Inc.
        
        1,497,114
        
        40,437,049CenturyTel, Inc.
        
        75,496
        
        2,536,665Frontier Communications Corp. (a)
        
        81,505
        
        614,548Qwest Communications International, Inc. (a)
        
        368,143
        
        1,402,625Verizon Communications, Inc. (a)
        
        719,684
        
        21,784,835Windstream Corp.
        
        115,874
        
        1,173,80467,949,526Wireless Telecommunication Services 0.3%American Tower Corp. "A"*
        
        99,336
        
        3,615,830MetroPCS Communications, Inc.*
        
        67,200
        
        628,992Sprint Nextel Corp.*
        
        746,728
        
        2,949,5767,194,398Utilities 3.7%Electric Utilities 2.1%Allegheny Energy, Inc.
        
        42,418
        
        1,124,926American Electric Power Co., Inc.
        
        121,765
        
        3,773,497Duke Energy Corp.
        
        328,391
        
        5,168,874Edison International
        
        83,774
        
        2,813,131Entergy Corp.
        
        50,109
        
        4,001,705Exelon Corp.
        
        167,655
        
        8,319,041
    FirstEnergy Corp.
        
        78,311
        
        3,580,379FPL Group, Inc.
        
        104,587
        
        5,776,340Northeast Utilities
        
        42,000
        
        997,080Pepco Holdings, Inc. (a)
        
        50,600
        
        752,928Pinnacle West Capital Corp.
        
        24,896
        
        817,087PPL Corp.
        
        96,548
        
        2,929,266Progress Energy, Inc. (a)
        
        71,550
        
        2,794,743Southern Co.
        
        203,488
        
        6,444,46549,293,462Gas Utilities 0.1%EQT Corp.
        
        34,000
        
        1,448,400Nicor, Inc.
        
        11,737
        
        429,457Questar Corp.
        
        43,700
        
        1,641,3723,519,229Independent Power Producers & Energy Traders 0.2%AES Corp.*
        
        171,150
        
        2,536,443Constellation Energy Group, Inc.
        
        49,587
        
        1,605,131Dynegy, Inc. "A"*
        
        107,461
        
        274,0264,415,600Multi-Utilities 1.3%Ameren Corp.
        
        53,419
        
        1,350,432CenterPoint Energy, Inc.
        
        93,768
        
        1,165,536CMS Energy Corp.
        
        59,049
        
        791,257Consolidated Edison, Inc. (a)
        
        71,316
        
        2,919,677Dominion Resources, Inc. (a)
        
        150,501
        
        5,192,284DTE Energy Co. (a)
        
        42,303
        
        1,486,527Integrys Energy Group, Inc.
        
        19,100
        
        685,499NiSource, Inc. (a)
        
        71,366
        
        991,274PG&E Corp. (a)
        
        95,347
        
        3,860,600Public Service Enterprise Group, Inc.
        
        128,781
        
        4,048,875SCANA Corp.
        
        27,767
        
        969,068Sempra Energy
        
        61,496
        
        3,063,116TECO Energy, Inc. (a)
        
        52,988
        
        746,071Wisconsin Energy Corp.
        
        30,500
        
        1,377,685Xcel Energy, Inc. (a)
        
        115,737
        
        2,226,78030,874,681Total Common Stocks(Cost $2,101,539,430)
        
        2,368,564,868PrincipalAmount ($)
        
        Value ($)Government & Agency Obligation 0.1%US Treasury ObligationUS Treasury Bill, 0.285% **, 11/19/2009 (b) (Cost $2,963,984)
        
        
        2,965,000
        
        2,964,739Shares
        
        Value ($)Securities Lending Collateral 25.0%Daily Assets Fund Institutional, 0.29% (c) (d)(Cost $597,428,403)
        
        
        597,428,403
        
        597,428,403Cash Equivalents 1.0%Cash Management QP Trust, 0.18% (c)(Cost $23,695,986)
        
        
        23,695,986
        
        23,695,986
    % ofNet Assets
        
        Value ($)Total Investment Portfolio(Cost $2,725,627,803) 
        125.5
        
        2,992,653,996Other Assets and Liabilities, Net(a)
        (25.5)
        
        (607,689,468)Net Assets
        100.0
        
        2,384,964,528For information on the Portfolio's policies regarding the valuation of investments and other significant accounting policies, please refer to the Portfolio's most recent semi-annual or annual financial statements.*
        Non-income producing security.**
        Annualized yield at time of purchase; not a coupon rate.
        The cost for federal income tax purposes was $2,907,167,605. At September 30, 2009, net unrealized appreciation for all securities based on tax cost was $85,486,391.  This consisted of aggregate gross unrealized appreciation for all securities in which there was an excess of value over tax cost of $659,369,076 and aggregate gross unrealized depreciation for all securities in which there was an excess of tax cost over value of $573,882,685.(a)
        All or a portion of these securities were on loan amounting to $580,084,489. In addition, included in other assets and liabilities, net are pending sales, amounting to $583,468, that are also on loan. The value of all securities loaned at September 30, 2009 amounted to $580,667,957 which is 24.3% of net assets.(b)
        At September 30, 2009, this security has been pledged, in whole or in part, to cover initial margin requirements for open futures contracts.(c)
        Affiliated fund managed by Deutsche Investment Management Americas Inc.  The rate shown is the annualized seven-day yield at period end.(d)
        Represents collateral held in connection with securities lending.  Income earned by the Portfolio is net of borrower rebates.REIT: Real Estate Investment TrustAt September 30, 2009, open futures contracts purchased were as follows:Futures
        
        ExpirationDate
        
        Contracts
        
        AggregatedFaceValue ($)
        
        Value ($)
        
        UnrealizedAppreciation ($)S&P 500 Index
        
        12/17/2009
        
        112
        
        28,852,388
        
        29,481,200
        
        628,812
  Fair Value Measurements  Various inputs are used in determining the value of the Portfolio's investments. These inputs are summarized in three broad levels. Level 1 includes quoted prices in active markets for identical securities. Level 2 includes other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, and credit risk). Level 3 includes significant unobservable inputs (including the Portfolio's own assumptions in determining the fair value of investments). The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.  The following is a summary of the inputs used as of September 30, 2009 in valuing the Portfolio's investments:  Level 1
        Level 2
        Level 3
        TotalAssetsCommon Stock and/or Other Equity Investments(e)
        $ 2,368,564,868
        $                      
        $                   
        $     2,368,564,868Short-Term Investments(e)
        597,428,403
        26,660,725
        
        624,089,128Derivatives(f)
        628,812
        
        
        628,812Total
        $ 2,966,622,083
        $        26,660,725
        $                   
        $ 2,993,282,808(e)
        See Investment Portfolio for additional detailed categorizations.(f)
        Derivatives include unrealized appreciation (depreciation) on open futures contracts.
  Derivatives  The following table presents, by major type of derivative contract, the unrealized appreciation (depreciation) of the Portfolio's derivative instruments as of September 30, 2009 categorized by the primary underlying risk exposure.    Primary Underlying Risk Disclosure
        FuturesEquity Contracts
        $                 628,812
    ITEM 2.
        CONTROLS AND PROCEDURES(a)          The Chief Executive and Financial Officers concluded that the Registrants Disclosure Controls and Procedures are effective based on the evaluation of the Disclosure Controls and Procedures as of a date within 90 days of the filing date of this report.(b)         There have been no changes in the registrants internal control over financial reporting that occurred during the registrants last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrants internal controls over financial reporting.ITEM 3.
        EXHIBITSCertification pursuant to Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 270.30a-2(a)) is filed and attached hereto as Exhibit 99.CERT.
   SIGNATURES  Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.  Registrant:
        DWS Equity 500 Index Fund, a series of DWS Institutional FundsBy:
        /s/Michael G. Clark
Michael G. Clark
PresidentDate:
        November 19, 2009
   Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.  Registrant:
        DWS Equity 500 Index Fund, a series of DWS Institutional FundsBy:
        /s/Michael G. Clark
Michael G. Clark
PresidentDate:
        November 19, 2009By:
        /s/Paul Schubert
Paul Schubert
Chief Financial Officer and TreasurerDate:
        November 19, 2009