N-Q 1 form-763.htm QUARTERLY SCHEDULE form-763.htm - Generated by SEC Publisher for SEC Filing

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT
INVESTMENT COMPANY

Investment Company Act file number          811-5719

Dreyfus Stock Index Fund, Inc.
(Exact name of Registrant as specified in charter)

c/o The Dreyfus Corporation
200 Park Avenue
New York, New York 10166
(Address of principal executive offices) (Zip code)

Michael A. Rosenberg, Esq.
200 Park Avenue
New York, New York 10166
(Name and address of agent for service)

Registrant's telephone number, including area code: (212) 922-6000
Date of fiscal year end: 12/31  
Date of reporting period: 3/31/10  


FORM N-Q

Item 1. Schedule of Investments.


STATEMENT OF INVESTMENTS    
Dreyfus Stock Index Fund    
March 31, 2010 (Unaudited)    
 
Common Stocks--99.2% Shares Value ($)
Consumer Discretionary--10.0%    
Abercrombie & Fitch, Cl. A 15,215 694,413
Amazon.com 57,554 a 7,811,804
Apollo Group, Cl. A 21,631 a 1,325,764
AutoNation 15,513 a,b 280,475
AutoZone 5,074 a,b 878,259
Bed Bath & Beyond 44,299 a 1,938,524
Best Buy 57,590 2,449,879
Big Lots 14,280 a,b 520,078
Carnival 74,280 2,888,006
CBS, Cl. B 114,521 1,596,423
Coach 53,785 b 2,125,583
Comcast, Cl. A 477,880 8,993,702
D.R. Horton 48,060 b 605,556
Darden Restaurants 24,543 1,093,145
DeVry 10,788 b 703,378
DIRECTV, Cl. A 157,531 a 5,326,123
Discovery Communications, Cl. A 47,704 a 1,611,918
Eastman Kodak 50,776 a,b 293,993
Expedia 36,509 911,265
Family Dollar Stores 24,365 b 892,003
Ford Motor 566,024 a,b 7,114,922
Fortune Brands 26,134 1,267,760
GameStop, Cl. A 28,522 a,b 624,917
Gannett 39,764 b 656,901
Gap 80,266 1,854,947
Genuine Parts 26,890 1,135,834
Goodyear Tire & Rubber 42,063 a 531,676
H & R Block 56,525 1,006,145
Harley-Davidson 39,562 b 1,110,505
Harman International Industries 10,113 a 473,086
Hasbro 20,724 793,315
Home Depot 286,539 9,269,537
International Game Technology 51,410 948,514
Interpublic Group of Cos. 83,026 a 690,776
J.C. Penney 38,561 1,240,507
Johnson Controls 110,805 3,655,457


Kohl's 51,831 a 2,839,302
Leggett & Platt 25,743 b 557,078
Lennar, Cl. A 24,473 421,180
Limited Brands 46,327 b 1,140,571
Lowe's 248,063 6,013,047
Macy's 71,025 1,546,214
Marriott International, Cl. A 42,558 b 1,341,428
Mattel 60,981 1,386,708
McDonald's 181,180 12,088,330
McGraw-Hill 53,181 1,895,903
Meredith 6,349 218,469
New York Times, Cl. A 20,284 a,b 225,761
Newell Rubbermaid 48,350 734,920
News, Cl. A 381,814 5,501,940
NIKE, Cl. B 66,007 4,851,514
Nordstrom 27,827 1,136,733
O'Reilly Automotive 23,664 a,b 987,025
Office Depot 48,032 a 383,295
Omnicom Group 52,620 2,042,182
Polo Ralph Lauren 9,943 845,553
Priceline.com 7,180 a 1,830,900
Pulte Group 52,887 a,b 594,979
RadioShack 21,181 479,326
Ross Stores 19,986 b 1,068,651
Scripps Networks Interactive, Cl.    
A 15,716 697,005
Sears Holdings 8,211 a,b 890,319
Sherwin-Williams 16,094 b 1,089,242
Stanley Black and Decker 26,987 1,549,327
Staples 122,013 2,853,884
Starbucks 124,945 3,032,415
Starwood Hotels & Resorts    
Worldwide 31,552 b 1,471,585
Target 126,751 6,667,103
Tiffany & Co. 21,668 1,029,013
Time Warner 193,805 6,060,282
Time Warner Cable 59,741 3,184,793
TJX 70,743 b 3,007,992
Urban Outfitters 21,586 a 820,916
VF 15,145 1,213,872
Viacom, Cl. B 102,933 a 3,538,837
Walt Disney 324,300 11,321,313
Washington Post, Cl. B 1,036 460,170


Whirlpool 12,539 b 1,094,028
Wyndham Worldwide 30,978 797,064
Wynn Resorts 10,613 804,784
Yum! Brands 79,109 3,032,248
    180,062,291
Consumer Staples--11.2%    
Altria Group 349,133 7,164,209
Archer-Daniels-Midland 108,932 3,148,135
Avon Products 72,372 b 2,451,240
Brown-Forman, Cl. B 17,043 1,013,206
Campbell Soup 32,499 b 1,148,840
Clorox 24,076 1,544,235
Coca-Cola 388,189 21,350,395
Coca-Cola Enterprises 55,293 1,529,404
Colgate-Palmolive 83,156 7,089,881
ConAgra Foods 74,700 1,872,729
Constellation Brands, Cl. A 33,752 a 554,883
Costco Wholesale 73,835 4,408,688
CVS Caremark 234,288 8,565,569
Dean Foods 30,709 a,b 481,824
Dr. Pepper Snapple Group 42,862 1,507,457
Estee Lauder, Cl. A 20,021 b 1,298,762
General Mills 55,227 3,909,519
H.J. Heinz 53,225 2,427,592
Hershey 28,964 b 1,239,949
Hormel Foods 12,217 513,236
J.M. Smucker 20,580 1,240,151
Kellogg 42,854 2,289,689
Kimberly-Clark 70,375 4,425,180
Kraft Foods, Cl. A 291,887 8,826,663
Kroger 110,397 2,391,199
Lorillard 26,114 1,964,817
McCormick & Co. 22,471 b 861,988
Mead Johnson Nutrition 32,299 1,680,517
Molson Coors Brewing, Cl. B 26,285 1,105,547
PepsiCo 274,899 18,187,318
Philip Morris International 316,889 16,528,930
Procter & Gamble 489,157 30,948,963
Reynolds American 28,537 b 1,540,427
Safeway 65,614 b 1,631,164
Sara Lee 117,495 1,636,705
SUPERVALU 37,123 619,212
SYSCO 100,186 2,955,487


Tyson Foods, Cl. A 52,250 1,000,588
Wal-Mart Stores 359,748 20,001,989
Walgreen 166,636 6,180,529
Whole Foods Market 24,498 a 885,603
    200,122,419
Energy--10.8%    
Anadarko Petroleum 83,326 6,068,633
Apache 56,636 5,748,554
Baker Hughes 52,507 b 2,459,428
BJ Services 49,523 1,059,792
Cabot Oil & Gas 18,062 664,682
Cameron International 37,807 a 1,620,408
Chesapeake Energy 109,638 b 2,591,842
Chevron 338,044 25,633,876
ConocoPhillips 249,985 12,791,732
Consol Energy 36,976 1,577,396
Denbury Resources 66,615 a 1,123,795
Devon Energy 74,821 4,820,717
Diamond Offshore Drilling 11,728 b 1,041,564
El Paso 118,317 1,282,556
EOG Resources 42,758 3,973,928
Exxon Mobil 795,114 53,256,736
FMC Technologies 20,651 a,b 1,334,674
Halliburton 153,105 4,613,054
Helmerich & Payne 17,780 b 677,062
Hess 49,266 3,081,588
Marathon Oil 120,143 3,801,324
Massey Energy 14,764 772,010
Murphy Oil 32,303 1,815,106
Nabors Industries 48,837 a 958,670
National Oilwell Varco 70,946 2,878,989
Noble Energy 29,360 2,143,280
Occidental Petroleum 136,753 11,561,099
Peabody Energy 45,284 2,069,479
Pioneer Natural Resources 19,480 b 1,097,114
Range Resources 27,042 b 1,267,459
Rowan 19,747 a,b 574,835
Schlumberger 201,489 12,786,492
Smith International 41,605 1,781,526
Southwestern Energy 58,395 a 2,377,844
Spectra Energy 109,403 2,464,850
Sunoco 20,370 605,193
Tesoro 24,029 b 334,003


Valero Energy 95,162 1,874,691
Williams 98,317 2,271,123
XTO Energy 97,774 4,612,977
    193,470,081
Financial--16.3%    
Aflac 79,339 4,307,314
Allstate 90,968 2,939,176
American Express 200,361 8,266,895
American International Group 23,460 a,b 800,924
Ameriprise Financial 43,127 1,956,241
AON 44,988 1,921,437
Apartment Investment & Management,    
Cl. A 19,445 b,c 357,982
Assurant 20,754 713,522
AvalonBay Communities 13,871 c 1,197,761
Bank of America 1,688,164 30,133,727
Bank of New York Mellon 202,886 6,265,120
BB & T 115,613 b 3,744,705
Berkshire Hathaway, Cl. B 278,448 a,b 22,629,469
Boston Properties 23,848 b,c 1,799,093
Capital One Financial 75,905 3,143,226
CB Richard Ellis Group, Cl. A 37,995 a 602,221
Charles Schwab 160,591 3,001,446
Chubb 55,431 2,874,097
Cincinnati Financial 28,291 b 817,610
Citigroup 3,304,274 a 13,382,310
CME Group 11,272 3,563,192
Comerica 26,265 999,121
Discover Financial Services 91,700 1,366,330
E*TRADE FINANCIAL 254,987 a 420,729
Equity Residential 47,205 b,c 1,848,076
Federated Investors, Cl. B 15,291 b 403,377
Fifth Third Bancorp 136,674 1,857,400
First Horizon National 39,140 a 549,913
Franklin Resources 25,385 2,815,196
Genworth Financial, Cl. A 75,122 a 1,377,737
Goldman Sachs Group 88,495 15,099,902
Hartford Financial Services Group 71,524 2,032,712
HCP 47,228 b,c 1,558,524
Health Care REIT 20,416 b,c 923,416
Host Hotels & Resorts 106,537 b,c 1,560,767
Hudson City Bancorp 79,512 1,125,890
Huntington Bancshares 119,170 b 639,943


IntercontinentalExchange 12,354 a 1,385,872
Invesco 71,645 1,569,742
Janus Capital Group 27,601 b 394,418
JPMorgan Chase & Co. 668,615 29,920,521
KeyCorp 147,993 b 1,146,946
Kimco Realty 63,879 b,c 999,068
Legg Mason 24,574 b 704,537
Leucadia National 30,742 a 762,709
Lincoln National 51,389 1,577,642
Loews 59,833 2,230,574
M & T Bank 13,423 b 1,065,518
Marsh & McLennan 89,360 2,182,171
Marshall & Ilsley 87,198 701,944
MetLife 137,953 5,978,883
Moody's 33,131 b 985,647
Morgan Stanley 235,054 6,884,732
Nasdaq OMX Group 23,606 a 498,559
Northern Trust 40,914 2,260,908
NYSE Euronext 43,906 1,300,057
People's United Financial 60,512 946,408
Plum Creek Timber 28,252 b,c 1,099,285
PNC Financial Services Group 86,887 b 5,187,154
Principal Financial Group 54,288 1,585,752
Progressive 114,916 2,193,746
ProLogis 73,125 b,c 965,250
Prudential Financial 78,599 4,755,240
Public Storage 22,867 c 2,103,535
Regions Financial 190,748 b 1,497,372
Simon Property Group 48,083 c 4,034,164
SLM 81,496 a 1,020,330
State Street 83,973 3,790,541
SunTrust Banks 84,158 b 2,254,593
T. Rowe Price Group 43,367 2,382,149
Torchmark 13,851 b 741,167
Travelers 86,750 4,679,295
U.S. Bancorp 322,218 8,339,002
Unum Group 55,938 1,385,584
Ventas 26,418 b,c 1,254,327
Vornado Realty Trust 26,511 b,c 2,006,883
Wells Fargo & Co. 871,442 27,119,275
XL Capital, Cl. A 53,898 1,018,672
Zions Bancorporation 19,809 b 432,232
    292,338,905


Health Care--12.1%    
Abbott Laboratories 260,609 13,728,882
Aetna 73,947 2,596,279
Allergan 52,163 3,407,287
AmerisourceBergen 48,600 1,405,512
Amgen 165,152 a 9,869,483
Baxter International 101,573 5,911,549
Becton Dickinson & Co. 39,968 3,146,681
Biogen Idec 45,567 a 2,613,723
Boston Scientific 255,622 a 1,845,591
Bristol-Myers Squibb 288,758 7,709,839
C.R. Bard 16,492 1,428,537
Cardinal Health 60,831 2,191,741
CareFusion 29,903 a 790,336
Celgene 77,875 a 4,825,135
Cephalon 12,859 a,b 871,583
CIGNA 46,055 1,684,692
Coventry Health Care 25,817 a,b 638,196
DaVita 17,262 a 1,094,411
Dentsply International 25,902 902,685
Eli Lilly & Co. 170,363 6,170,548
Express Scripts 46,671 a 4,749,241
Forest Laboratories 51,006 a 1,599,548
Genzyme 44,752 a 2,319,496
Gilead Sciences 151,665 a 6,897,724
Hospira 27,781 a 1,573,794
Humana 28,647 a 1,339,820
Intuitive Surgical     6,439 a 2,241,609
Johnson & Johnson 463,370 30,211,724
King Pharmaceuticals 42,951 a 505,104
Laboratory Corp. of America    
Holdings 17,939 a,b 1,358,162
Life Technologies 30,028 a 1,569,564
McKesson 45,121 2,965,352
Medco Health Solutions 78,241 a 5,051,239
Medtronic 186,484 8,397,374
Merck & Co. 523,976 19,570,504
Millipore     9,576 a 1,011,226
Mylan 53,114 a,b 1,206,219
Patterson 15,918 b 494,254
PerkinElmer 20,936 500,370
Pfizer 1,359,637 23,317,775
Quest Diagnostics 25,351 b 1,477,710


St. Jude Medical 54,871 a 2,252,455
Stryker 48,168 b 2,756,173
Tenet Healthcare 72,212 a 413,053
Thermo Fisher Scientific 69,238 a 3,561,603
UnitedHealth Group 195,785 6,396,296
Varian Medical Systems 20,908 a,b 1,156,840
Waters 16,082 a 1,086,178
Watson Pharmaceuticals 18,223 a,b 761,175
WellPoint 74,868 a 4,820,002
Zimmer Holdings 36,294 a 2,148,605
    216,542,879
Industrial--10.4%    
3M 118,677 9,917,837
Avery Dennison 18,491 673,257
Boeing 127,187 b 9,235,048
C.H. Robinson Worldwide 28,489 b 1,591,111
Caterpillar 104,938 b 6,595,353
Cintas 23,099 b 648,851
CSX 66,482 3,383,934
Cummins 34,125 2,114,044
Danaher 43,854 b 3,504,373
Deere & Co. 71,753 4,266,433
Dover 31,422 1,468,978
Dun & Bradstreet    8,786 653,854
Eaton 28,009 2,122,242
Emerson Electric 126,720 6,379,085
Equifax 22,460 b 804,068
Expeditors International of    
Washington 35,820 1,322,474
Fastenal 22,520 b 1,080,735
FedEx 53,027 4,952,722
First Solar 8,242 a,b 1,010,881
Flowserve   9,417 1,038,413
Fluor 30,197 1,404,462
General Dynamics 65,386 5,047,799
General Electric 1,793,902 32,649,016
Goodrich 20,915 1,474,926
Honeywell International 128,806 5,831,048
Illinois Tool Works 65,310 3,093,082
Iron Mountain 31,445 b 861,593
ITT 30,813 1,651,885
Jacobs Engineering Group 21,322 a,b 963,541
L-3 Communications Holdings 19,607 1,796,589


Lockheed Martin 53,132 4,421,645
Masco 62,815 974,889
Norfolk Southern 62,340 3,484,183
Northrop Grumman 51,068 3,348,529
Paccar 61,571 b 2,668,487
Pall 19,749 799,637
Parker Hannifin 27,125 1,756,073
Pitney Bowes 36,289 b 887,266
Precision Castparts 23,765 3,011,263
Quanta Services 33,975 a 650,961
R.R. Donnelley & Sons 34,471 735,956
Raytheon 64,616 3,690,866
Republic Services 54,493 1,581,387
Robert Half International 25,519 b 776,543
Rockwell Automation 23,925 1,348,413
Rockwell Collins 26,636 1,667,147
Roper Industries 15,347 b 887,670
Ryder System 9,817 b 380,507
Snap-On 9,977 432,403
Southwest Airlines 127,953 b 1,691,539
Stericycle 14,220 a 774,990
Textron 43,100 b 915,013
Union Pacific 85,007 6,231,013
United Parcel Service, Cl. B 167,294 10,775,407
United Technologies 158,000 11,630,380
W.W. Grainger 10,537 b 1,139,260
Waste Management 81,740 b 2,814,308
    187,013,369
Information Technology--18.7%    
Adobe Systems 89,059 a 3,150,017
Advanced Micro Devices 97,297 a,b 901,943
Agilent Technologies 58,209 a 2,001,807
Akamai Technologies 29,420 a,b 924,082
Altera 49,577 1,205,217
Amphenol, Cl. A 28,910 1,219,713
Analog Devices 49,231 1,418,837
Apple 152,613 a 35,853,372
Applied Materials 226,256 3,049,931
Autodesk 39,163 a 1,152,175
Automatic Data Processing 85,202 3,788,933
BMC Software 31,051 a 1,179,938
Broadcom, Cl. A 73,108 2,425,723
CA 66,873 1,569,509


Cisco Systems 964,194 a 25,097,970
Citrix Systems 30,870 a,b 1,465,399
Cognizant Technology Solutions,    
Cl. A 49,692 a 2,533,298
Computer Sciences 25,708 a 1,400,829
Compuware 39,112 a 328,541
Corning 263,935 5,334,126
Dell 292,252 a,b 4,386,702
eBay 190,645 a,b 5,137,883
Electronic Arts 55,518 a 1,035,966
EMC 343,491 a 6,196,578
Fidelity National Information    
Services 53,952 1,264,635
Fiserv 26,071 a 1,323,364
FLIR Systems 24,017 a 677,279
Google, Cl. A 40,624 a 23,034,214
Harris 22,039 1,046,632
Hewlett-Packard 396,474 21,072,593
Intel 931,101 20,726,308
International Business Machines 218,820 28,063,665
Intuit 53,479 a 1,836,469
Jabil Circuit 31,967 517,546
JDS Uniphase 37,260 a 466,868
Juniper Networks 88,847 a,b 2,725,826
KLA-Tencor 28,767 889,476
Lexmark International, Cl. A 13,851 a 499,744
Linear Technology 38,642 b 1,092,796
LSI 112,159 a 686,413
MasterCard, Cl. A 16,061 b 4,079,494
McAfee 26,651 a 1,069,505
MEMC Electronic Materials 39,460 a,b 604,922
Microchip Technology 30,984 b 872,509
Micron Technology 143,337 a,b 1,489,271
Microsoft 1,285,438 37,624,770
Molex 22,654 b 472,562
Monster Worldwide 21,625 a,b 359,191
Motorola 389,473 a 2,734,100
National Semiconductor 33,682 b 486,705
NetApp 56,987 a 1,855,497
Novell 60,217 a 360,700
Novellus Systems 17,349 a 433,725
NVIDIA 92,537 a,b 1,608,293
Oracle 658,820 16,925,086


Paychex 54,335 b 1,668,085
QLogic 19,533 a,b 396,520
QUALCOMM 281,368 11,814,642
Red Hat 31,695 a 927,713
SAIC 48,916 a 865,813
Salesforce.com 18,134 a,b 1,350,076
SanDisk 39,240 a,b 1,358,881
Symantec 138,043 a 2,335,688
Tellabs 69,443 525,684
Teradata 28,879 a 834,314
Teradyne 29,383 a,b 328,208
Texas Instruments 209,178 5,118,586
Total System Services 34,497 540,223
VeriSign 31,027 a,b 807,012
Visa, Cl. A 73,474 b 6,688,338
Western Digital 38,005 a 1,481,815
Western Union 116,676 1,978,825
Xerox 230,559 2,247,950
Xilinx 46,708 1,191,054
Yahoo! 202,479 a 3,346,978
    335,465,052
Materials--3.5%    
Air Products & Chemicals 35,621 2,634,173
Airgas 14,283 908,684
AK Steel Holding 19,667 449,588
Alcoa 166,305 2,368,183
Allegheny Technologies 16,568 b 894,506
Ball 15,815 844,205
Bemis 17,237 495,047
CF Industries Holdings   8,408 766,641
Cliffs Natural Resources 20,924 1,484,558
Dow Chemical 192,698 5,698,080
E.I. du Pont de Nemours & Co. 152,263 5,670,274
Eastman Chemical 12,182 775,750
Ecolab 39,378 1,730,663
FMC 12,160 736,166
Freeport-McMoRan Copper & Gold 72,269 6,037,352
International Flavors & Fragrances 13,710 653,556
International Paper 73,018 1,796,973
MeadWestvaco 29,763 760,445
Monsanto 91,843 6,559,427
Newmont Mining 83,172 4,235,950
Nucor 53,344 b 2,420,751


Owens-Illinois 29,123 a 1,035,031
Pactiv 22,838 a 575,061
PPG Industries 28,590 1,869,786
Praxair 52,094 4,323,802
Sealed Air 27,547 580,691
Sigma-Aldrich 20,548 b 1,102,606
Titanium Metals 14,875 a,b 246,776
United States Steel 24,837 b 1,577,646
Vulcan Materials 21,182 b 1,000,638
Weyerhaeuser 35,656 1,614,147
    61,847,156
Telecommunication Services--2.8%    
American Tower, Cl. A 66,861 a 2,848,947
AT & T 994,296 25,692,609
CenturyTel 50,294 b 1,783,425
Frontier Communications 55,262 b 411,149
Metropcs Communications 44,240 a,b 313,219
Qwest Communications International 250,527 b 1,307,751
Sprint Nextel 497,328 a 1,889,846
Verizon Communications 478,635 14,847,258
Windstream 76,754 835,851
    49,930,055
Utilities--3.4%    
AES 112,848 a 1,241,328
Allegheny Energy 29,460 677,580
Ameren 36,456 950,772
American Electric Power 80,501 2,751,524
CenterPoint Energy 59,216 850,342
CMS Energy 39,273 b 607,161
Consolidated Edison 47,664 b 2,122,955
Constellation Energy Group 33,885 1,189,702
Dominion Resources 101,015 4,152,727
DTE Energy 28,431 b 1,268,023
Duke Energy 220,034 3,590,955
Edison International 55,155 1,884,646
Entergy 31,889 2,594,170
EQT 22,824 935,784
Exelon 111,093 4,866,984
FirstEnergy 51,665 2,019,585
FPL Group 69,842 3,375,464
Integrys Energy 13,342 b 632,144
Nicor   7,852 b 329,156
NiSource 47,883 b 756,551


Northeast Utilities 30,134 b 832,904
NRG Energy 43,207 a 903,026
ONEOK 17,573 b 802,207
Pepco Holdings 37,615 b 645,097
PG & E 62,844 b 2,665,842
Pinnacle West Capital 17,569 662,878
PPL 63,762 1,766,845
Progress Energy 47,153 1,855,942
Public Service Enterprise Group 85,802 2,532,875
Questar 30,209 1,305,029
SCANA 18,478 694,588
Sempra Energy 41,550 2,073,345
Southern 135,336 4,487,742
TECO Energy 37,092 b 589,392
Wisconsin Energy 20,419 1,008,903
Xcel Energy 77,665 1,646,498
    61,270,666
Total Common Stocks    
(cost $1,335,179,746)   1,778,062,873
  Principal  
Short-Term Investments--.1% Amount ($) Value ($)
U.S. Treasury Bills    
0.15%, 6/10/10    
(cost $1,354,606) 1,355,000 d 1,354,652
 
Other Investment--.7% Shares Value ($)
Registered Investment Company;    
Dreyfus Institutional Preferred    
Plus Money Market Fund    
(cost $12,686,000) 12,686,000 e 12,686,000
 
Investment of Cash Collateral for    
Securities Loaned--8.9%    
Registered Investment Company;    
Dreyfus Institutional Cash    
Advantage Plus Fund    
(cost $160,227,774) 160,227,774 e 160,227,774
 
Total Investments (cost $1,509,448,126) 108.9% 1,952,331,299
Liabilities, Less Cash and Receivables (8.9%) (159,175,383)
Net Assets 100.0% 1,793,155,916

a     

Non-income producing security.


b     

Security, or portion thereof, on loan. At March 31, 2010, the total market value of the fund's securities on loan is $163,843,133 and the total market value of the collateral held by the fund is $168,836,193, consisting of cash collateral of $160,227,774 and U.S. Government and Agency securities valued at $8,608,419.

c     

Investment in real estate investment trust.

d     

Held by a broker as collateral for open financial futures positions.

e     

Investment in affiliated money market mutual fund.

At March 31, 2010, the aggregate cost of investment securities for income tax purposes was $1,509,448,126.

Net unrealized appreciation on investments was $442,883,173 of which $653,144,800 related to appreciated investment securities and $210,261,627 related to depreciated investment securities.

STATEMENT OF FINANCIAL FUTURES
March 31, 2010 (Unaudited)

    Market Value   Unrealized
    Covered by   Appreciation
  Contracts Contracts ($) Expiration at 3/31/2010 ($)
Financial Futures Long        
Standard & Poor's 500 E-Mini 280 16,312,800 June 2010 335,592


Various inputs are used in determining the value of the fund's investments relating to fair value measurements.
These inputs are summarized in the three broad levels listed below.
 
                  Level 1 - unadjusted quoted prices in active markets for identical investments.
Level 2 - other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds,
credit risk, etc.)
Level 3 - significant unobservable inputs (including fund'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 March 31, 2010 in valuing the fund's investments:

      Level 3 -  
  Level 1 - Level 2 - Other Significant  
  Unadjusted Significant Observable Unobservable  
Assets ($) Quoted Prices Inputs Inputs Total
Investments in Securities:        
Equity Securities - Domestic+ 1,778,062,873 - - 1,778,062,873
U.S. Treasury - 1,354,652 - 1,354,652
Mutual Funds 172,913,774 - - 172,913,774
Other Financial Instruments:++        
Futures 335,592 - - 335,592

+ See Statement of Investments for industry classification.

++ Other financial instruments include derivative instruments, such as futures, forward foreign currency exchange contracts, swap contracts and options contracts. Amounts shown represent unrealized appreciation (depreciation), or in the case of options, market value at period end.


The Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) is the exclusive reference of authoritative U.S. generally accepted accounting principles (“GAAP”) recognized by the FASB to be applied by nongovernmental entities. Rules and interpretive releases of the Securities and Exchange Commission (“SEC”) under authority of federal laws are also sources of authoritative GAAP for SEC registrants. The fund's financial statements are prepared in accordance with GAAP, which may require the use of management estimates and assumptions. Actual results could differ from those estimates.

Portfolio valuation: Investments in securities are valued at the last sales price on the securities exchange or national securities market on which such securities are primarily traded. Securities listed on the National Market System for which market quotations are available are valued at the official closing price or, if there is no official closing price that day, at the last sales price. Securities not listed on an exchange or the national securities market, or securities for which there were no transactions, are valued at the average of the most recent bid and asked prices, except for open short positions, where the asked price is used for valuation purposes. Bid price is used when no asked price is available. Registered investment companies that are not traded on an exchange are valued at their net asset value. When market quotations or official closing prices are not readily available, or are determined not to reflect accurately fair value, such as when the value of a security has been significantly affected by events after the close of the exchange or market on which the security is principally traded (for example, a foreign exchange or market), but before the fund calculates its net asset value, the fund may value these investments at fair value as determined in accordance with the procedures approved by the Board of Directors. Fair valuing of securities may be determined with the assistance of a pricing service using calculations based on indices of domestic securities and other appropriate indicators, such as prices of relevant American Depository Receipts and futures contracts. For other securities that are fair valued by the Board of Directors, certain factors may be considered such as: fundamental analytical data, the nature and duration of restrictions on disposition, an evaluation of the forces that influence the market in which the securities are purchased and sold, and public trading in similar securities of the issuer or comparable issuers. Financial futures are valued at the last sales price.


Pursuant to a securities lending agreement with The Bank of New York Mellon, a subsidiary of BNY Mellon and an affiliate of Dreyfus, the fund may lend securities to qualified institutions. It is the fund’s policy that, at origination, all loans are secured by collateral of at least 102% of the value of U.S. securities loaned and 105% of the value of foreign securities loaned. Collateral equivalent to at least 100% of the market value of securities on loan is maintained at all times. Collateral is either in the form of cash, which can be invested in certain money market mutual funds managed by the Manager, U.S. Government and Agency securities or letters of credit. The fund is entitled to receive all income on securities loaned, in addition to income earned as a result of the lending transaction. Although each security loaned is fully collateralized, the fund bears the risk of delay in recovery of, or loss of rights in, the securities loaned should a borrower fail to return the securities in a timely manner.

The fund adopted the provisions of ASC Topic 815 “Derivatives and Hedging” which requires qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts of gains and losses on derivative instruments and disclosures about credit-risk-related contingent features in derivative agreements. The disclosure requirements distinguish between derivatives, which are accounted for as “hedges” and those that do not qualify for hedge accounting. Because investment companies value their derivatives at fair value and recognize changes in fair value through the Statement of Operations, they do not qualify for such accounting. Accordingly, even though a fund’s investments in derivatives may represent economic hedges, they are considered to be non-hedge transactions for purposes of this disclosure.

Futures Contracts: In the normal course of pursuing its investment objective, the fund is exposed to market risk, including equity risk, as a result of changes in value of underlying financial instruments. The fund invests in financial futures contracts in order to manage its exposure to or protect against changes in the market. A futures contract represents a commitment for the future purchase or a sale of an asset at a specified date. Upon entering into such contracts, these investments require initial margin deposits with a broker, which consist of cash or cash equivalents. The amount of these deposits is determined by the


exchange or Board of Trade on which the contract is traded and is subject to change. Accordingly, variation margin payments are received or made to reflect daily unrealized gains or losses which are recorded in the Statement of Operations. Futures contracts are valued daily at the last sales price established by the Board of Trade or exchange upon which they are traded. When the contracts are closed, the fund recognizes a realized gain or loss. There is minimal counterparty credit risk to the fund with futures, since futures are exchange traded and the exchange’s clearinghouse, as counterparty to all exchange traded futures, guarantees the futures against default.

Additional investment related disclosures are hereby incorporated by reference to the annual and semi-annual reports previously filed with the Securities and Exchange Commission on Form N-CSR.


Item 2. Controls and Procedures.

(a) The Registrant's principal executive and principal financial officers have concluded, based on their evaluation of the Registrant's disclosure controls and procedures as of a date within 90 days of the filing date of this report, that the Registrant's disclosure controls and procedures are reasonably designed to ensure that information required to be disclosed by the Registrant on Form N-Q is recorded, processed, summarized and reported within the required time periods and that information required to be disclosed by the Registrant in the reports that it files or submits on Form N-Q is accumulated and communicated to the Registrant's management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure.

(b) There were no changes to the Registrant's internal control over financial reporting that occurred during the Registrant's most recently ended fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Registrant's internal control over financial reporting.

Item 3. Exhibits.

(a) Certifications of principal executive and principal financial officers as required by Rule 30a-2(a) under the Investment Company Act of 1940.


FORM N-Q

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.

Dreyfus Stock Index Fund, Inc.

By: /s/ Bradley J. Skapyak
  Bradley J. Skapyak
  President
 
Date: May 24, 2010

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.

By: /s/ Bradley J. Skapyak
  Bradley J. Skapyak
  President
 
Date: May 24, 2010
 
By: /s/ James Windels
James Windels
  Treasurer
 
Date: May 24, 2010

EXHIBIT INDEX

(a) Certifications of principal executive and principal financial officers as required by Rule 30a-2(a) under the Investment Company Act of 1940. (EX-99.CERT)