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

                                   FORM N-CSR

                   CERTIFIED SHAREHOLDER REPORT OF REGISTERED
                         MANAGEMENT INVESTMENT COMPANIES

                  Investment Company Act file number: 811-09599

                                   ----------

                            STATE STREET MASTER FUNDS
               (Exact name of registrant as specified in charter)

                                  P.O. Box 5501
                           Boston, Massachusetts 02206
               (Address of principal executive offices)(Zip code)


                                            
  (Name and Address of Agent for Service)                  Copy to:
Nancy L. Conlin, Vice President and Counsel        Timothy W. Diggins, Esq.
    State Street Bank and Trust Company                Ropes & Gray LLP
              4 Copley Place                       One International Place
     Tower II- floor 3 Legal Division          Boston, Massachusetts 02110-2624
        Boston, Massachusetts 02116


Registrant's telephone number, including area code: (617) 662-3966

Date of fiscal year end: December 31

Date of reporting period: June 30, 2008



ITEM 1: SHAREHOLDER REPORT


                    STATE STREET EQUITY 500 INDEX PORTFOLIO

                               SEMI-ANNUAL REPORT

                                  JUNE 30, 2008

                                   (UNAUDITED)



STATE STREET EQUITY 500 INDEX PORTFOLIO

EXPENSE EXAMPLE

As a shareholder of the State Street Equity 500 Index Portfolio (the
"Portfolio"), you incur ongoing costs, which include costs for portfolio
management and administrative services, among others. This example is intended
to help you understand your ongoing costs (in dollars) of investing in the
Portfolio and to compare these costs with the ongoing costs of investing in
other mutual funds.

The example is based on an investment of $1,000 made at the beginning of the
period shown and held for the entire period from January 1, 2008 to June 30,
2008.

The table below illustrates your Portfolio's costs in two ways:

     -    BASED ON ACTUAL FUND RETURN. This section helps you to estimate the
          actual expenses that you paid over the period. The "Ending Account
          Value" shown is derived from the actual return of the Portfolio, and
          the third column shows the dollar amount that would have been paid by
          an investor who started with $1,000 in the Portfolio. You may use the
          information here, together with the amount you invested, to estimate
          the expenses that you paid over the period.

          To do so, simply divide your account value by $1,000 (for example, an
          $8,600 account value divided by $1,000 = 8.6), then multiply the
          result by the number given for the Portfolio under the heading
          "Expenses Paid During Period".

     -    BASED ON HYPOTHETICAL 5% RETURN. This section is intended to help you
          compare your Portfolio's costs with those of other mutual funds. It
          assumes that the Portfolio had a yearly return of 5% before expenses,
          but that the expense ratio is unchanged. In this case-because the
          return used is not the Portfolio's actual return- the results do not
          apply to your investment. The example is useful in making comparisons
          because the Securities and Exchange Commission requires all mutual
          funds to calculate expenses based on a 5% return. You can assess your
          Portfolio's costs by comparing this hypothetical example with the
          hypothetical examples that appear in shareholder reports of other
          funds.

Six Months Ended June 30, 2008



                           BEGINNING          ENDING
                         ACCOUNT VALUE    ACCOUNT VALUE    EXPENSES PAID
                        JANUARY 1, 2008   JUNE 30, 2008   DURING PERIOD *
                        ---------------   -------------   ---------------
                                                 
BASED ON ACTUAL
   PORTFOLIO RETURN        $1,000.00        $  880.20          $0.21
BASED ON HYPOTHETICAL
   (5% RETURN BEFORE
   EXPENSES)               $1,000.00        $1,024.64          $0.23


*    The calculations are based on expenses incurred in the most recent fiscal
     period of the Portfolio. The annualized average weighted expense ratio as
     of June 30, 2008 was 0.045%. The dollar amounts shown as "Expenses Paid"
     are equal to the annualized average weighted expense ratio multiplied by
     the average account value over the period, multiplied by the number of days
     in the most recent six-month period, then divided by the number of days in
     the most recent 12-month period.


                                        1



STATE STREET EQUITY 500 INDEX PORTFOLIO

PORTFOLIO STATISTICS (UNAUDITED)



PORTFOLIO COMPOSITION*                                 JUNE 30, 2008
- ----------------------                                 -------------
                                                    
Common Stocks                                               97.6%
Money Market Funds                                           1.8
U.S. Government Securities                                   0.1
Liabilities less cash and other assets                       0.5
                                                           -----
Total                                                      100.0%
                                                           =====




TOP FIVE SECTORS (EXCLUDING SHORT-TERM INVESTMENTS)*   JUNE 30, 2008
- ----------------------------------------------------   -------------
                                                    
Information Technology                                      15.5%
Energy                                                      15.0
Financials                                                  14.0
Health Care                                                 11.5
Industrials                                                 11.1
                                                            ----
Total                                                       67.1%
                                                            ====


*    As a percentage of net assets as of the date indicated. The Portfolio's
     composition may vary over time.


                                        2


STATE STREET EQUITY 500 INDEX PORTFOLIO
PORTFOLIO OF INVESTMENTS
JUNE 30, 2008 (UNAUDITED)



                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
COMMON STOCKS -- 97.6%
CONSUMER DISCRETIONARY -- 8.2%
Abercrombie & Fitch Co.                                      15,846   $      993
Amazon.Com, Inc. (a)                                         54,892        4,025
Apollo Group, Inc. Class A (a)                               24,529        1,086
AutoNation, Inc. (a)                                         23,063          231
AutoZone, Inc. (a)                                            7,864          952
Bed Bath & Beyond, Inc. (a)                                  46,645        1,311
Best Buy Co., Inc.                                           60,719        2,404
Big Lots, Inc. (a)                                           12,827          401
Black & Decker Corp.                                         10,037          577
Carnival Corp.                                               77,250        2,546
CBS Corp. Class B                                           120,203        2,343
Centex Corp.                                                 24,082          322
Clear Channel Communications, Inc.                           88,647        3,120
Coach, Inc. (a)                                              63,128        1,823
Comcast Corp. Class A                                       527,348       10,004
D.R. Horton, Inc.                                            45,576          495
Darden Restaurants, Inc.                                     25,688          820
Dillard's, Inc. Class A                                      12,294          142
DIRECTV Group, Inc. (a)                                     128,877        3,339
Eastman Kodak Co.                                            54,482          786
eBay, Inc. (a)                                              198,703        5,431
EW Scripps Co. Class A                                       16,835          699
Expedia, Inc. (a)                                            39,215          721
Family Dollar Stores, Inc.                                   27,158          542
Ford Motor Co. (a)                                          387,098        1,862
Fortune Brands, Inc.                                         27,745        1,732
GameStop Corp. (a)                                           29,000        1,172
Gannett Co., Inc.                                            42,074          912
Gap, Inc.                                                    81,298        1,355
General Motors Corp.                                         98,645        1,134
Genuine Parts Co.                                            30,809        1,223
Goodyear Tire & Rubber Co. (a)                               45,257          807
H&R Block, Inc.                                              58,415        1,250
Harley-Davidson, Inc.                                        43,201        1,566
Harman International Industries, Inc.                        10,521          435
Hasbro, Inc.                                                 25,825          922
Home Depot, Inc.                                            301,112        7,052
Host Hotels & Resorts, Inc.                                  91,365        1,247
International Game Technology                                55,119        1,377
Interpublic Group of Cos., Inc. (a)                          83,694          720
JC Penney & Co., Inc.                                        40,310        1,463
Johnson Controls, Inc.                                      105,286        3,020
Jones Apparel Group, Inc.                                    13,434          185
KB HOME                                                      14,794          250
Kohl's Corp. (a)                                             53,533        2,143
Leggett & Platt, Inc.                                        32,898          552
Lennar Corp. Class A                                         27,931          345
Limited Brands                                               50,567          852
Liz Claiborne, Inc.                                          20,797          294
Lowe's Cos., Inc.                                           259,262        5,380
Macy's, Inc.                                                 78,723        1,529
Marriot International, Inc. Class A                          52,821        1,386
Mattel, Inc.                                                 66,976        1,147
McDonald's Corp.                                            202,025       11,358




                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
McGraw-Hill, Inc.                                            56,766   $    2,277
Meredith Corp.                                                7,889          223
New York Times Co. Class A                                   22,922          353
Newell Rubbermaid, Inc.                                      51,593          866
News Corp. Class A                                          410,409        6,173
NIKE, Inc. Class B                                           68,052        4,057
Nordstrom, Inc.                                              30,833          934
Office Depot, Inc. (a)                                       51,256          561
Omnicom Group, Inc.                                          56,541        2,538
Polo Ralph Lauren Corp.                                      10,615          666
Pulte Homes, Inc.                                            34,526          332
Radioshack Corp.                                             20,203          248
Sears Holdings Corp. (a)                                     12,674          934
Sherwin-Williams Co.                                         18,396          845
Snap-On, Inc.                                                 9,512          495
Stanley Works                                                14,583          654
Staples, Inc.                                               123,933        2,943
Starbucks Corp. (a)                                         128,561        2,024
Starwood Hotels & Resorts Worldwide, Inc.                    33,647        1,348
Target Corp.                                                139,316        6,477
Tiffany & Co.                                                22,280          908
Time Warner, Inc.                                           638,473        9,449
TJX Cos., Inc.                                               77,106        2,427
V.F. Corp.                                                   15,193        1,081
Viacom, Inc. Class B (a)                                    113,922        3,479
Walt Disney Co.                                             338,745       10,569
Washington Post Co.                                           1,060          622
Wendy's International, Inc.                                  17,016          463
Whirlpool Corp.                                              13,761          849
Wyndham Worldwide Corp.                                      34,299          614
Yum! Brands, Inc.                                            84,192        2,954
                                                                      ----------
                                                                         168,146
                                                                      ----------
CONSUMER STAPLES -- 10.5%
Altria Group, Inc.                                          376,299        7,737
Anheuser-Busch Cos., Inc.                                   127,403        7,914
Archer-Daniels-Midland Co.                                  114,424        3,862
Avon Products, Inc.                                          77,160        2,779
Brown-Forman Corp. Class B                                   15,624        1,181
Campbell Soup Co.                                            39,265        1,314
Clorox Co.                                                   25,743        1,344
Coca-Cola Co.                                               357,511       18,583
Coca-Cola Enterprises, Inc.                                  53,901          932
Colgate-Palmolive Co.                                        90,901        6,281
ConAgra Foods, Inc.                                          85,775        1,654
Constellation Brands, Inc. Class A (a)                       37,226          739
Costco Wholesale Corp.                                       77,289        5,421
CVS Corp.                                                   255,832       10,123
Dean Foods Co. (a)                                           25,258          496
Estee Lauder Cos, Inc. Class A                               20,552          955
General Mills, Inc.                                          60,132        3,654
H.J. Heinz Co.                                               55,669        2,664
Hershey Foods Corp.                                          29,582          970
Kellogg Co.                                                  45,935        2,206
Kimberly-Clark Corp.                                         75,900        4,537


                       See Notes to Financial Statements


                                       3



STATE STREET EQUITY 500 INDEX PORTFOLIO
PORTFOLIO OF INVESTMENTS - (CONTINUED)
JUNE 30, 2008 (UNAUDITED)



                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
CONSUMER STAPLES -- (CONTINUED)
Kraft Foods, Inc.                                           269,122   $    7,657
Kroger Co.                                                  116,676        3,368
Lorillard, Inc. (a)                                          30,860        2,134
McCormick & Co., Inc.                                        22,353          797
Molson Coors Brewing Co., Class B                            23,862        1,296
Pepsi Bottling Group, Inc.                                   22,953          641
PepsiCo, Inc.                                               283,156       18,006
Philip Morris International, Inc.                           377,099       18,625
Procter & Gamble Co.                                        545,612       33,179
Reynolds American, Inc.                                      31,387        1,465
Safeway, Inc.                                                80,264        2,292
Sara Lee Corp.                                              129,634        1,588
SuperValu, Inc.                                              37,648        1,163
Sysco Corp.                                                 106,809        2,938
Tyson Foods, Inc., Class A                                   46,035          688
UST Corp.                                                    26,637        1,455
Wal-Mart Stores, Inc.                                       416,502       23,407
Walgreen Co.                                                176,718        5,745
Whole Foods Market, Inc.                                     25,433          602
Wrigley Wm., Jr. Co.                                         38,648        3,006
                                                                      ----------
                                                                         215,398
                                                                      ----------
ENERGY -- 15.0%
Anadarko Petroleum Corp.                                     83,326        6,236
Apache Corp.                                                 59,425        8,260
Baker Hughes, Inc.                                           54,878        4,793
BJ Services Co.                                              52,248        1,669
Cabot Oil & Gas Corp.                                        17,400        1,179
Cameron International Corp. (a)                              38,000        2,103
Chesapeake Energy Corp.                                      85,982        5,671
ChevronTexaco Corp.                                         368,946       36,574
ConocoPhillips                                              276,030       26,054
Devon Energy Corp.                                           79,351        9,535
El Paso Corp.                                               123,192        2,678
ENSCO International, Inc.                                    26,077        2,105
EOG Resources, Inc.                                          44,317        5,814
ExxonMobil Corp.                                            943,272       83,131
Halliburton Co.                                             156,234        8,291
Hess Corp.                                                   49,801        6,284
Marathon Oil Corp.                                          126,277        6,550
Murphy Oil Corp.                                             33,841        3,318
Nabors Industries, Ltd. (a)                                  48,904        2,408
National Oilwell Varco, Inc. (a)                             73,557        6,526
Noble Corp.                                                  47,918        3,113
Noble Energy, Inc.                                           31,210        3,139
Occidental Petroleum Corp.                                  146,944       13,204
Range Resources Corp.                                        27,200        1,783
Rowan Cos., Inc.                                             19,520          913
Schlumberger, Ltd.                                          212,675       22,848
Smith International, Inc.                                    35,334        2,938
Sunoco, Inc.                                                 21,584          878
Tesoro Corp.                                                 26,365          521
Transocean, Inc. (a)                                         56,635        8,631
Valero Energy Corp.                                          95,009        3,912
Weatherford International Ltd. (a)                          120,910        5,996




                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
Williams Cos., Inc.                                         104,468   $    4,211
XTO Energy, Inc.                                             90,821        6,222
                                                                      ----------
                                                                         307,488
                                                                      ----------
FINANCIALS -- 14.0%
ACE, Ltd.                                                    59,783        3,293
AFLAC, Inc.                                                  84,490        5,306
Allstate Corp.                                               97,306        4,436
American Capital Strategies Ltd.                             34,302          815
American Express Co.                                        206,364        7,774
American International Group, Inc.                          479,966       12,700
Ameriprise Financial, Inc.                                   39,907        1,623
AON Corp.                                                    54,747        2,515
Apartment Investment & Management Co. Class A                17,797          606
Assurant, Inc.                                               17,131        1,130
AvalonBay Communities, Inc.                                  13,353        1,191
Bank of America Corp.                                       795,098       18,979
Bank of New York Mellon Corp.                               203,085        7,683
BB&T Corp.                                                   96,670        2,201
Boston Properties, Inc.                                      21,667        1,955
Capital One Financial Corp.                                  66,063        2,511
CB Richard Ellis Group, Inc. Class A (a)                     29,875          574
Charles Schwab Corp.                                        166,093        3,412
Chubb Corp.                                                  65,575        3,214
Cincinnati Financial Corp.                                   28,114          714
CIT Group, Inc.                                              54,842          374
Citigroup, Inc.                                             974,402       16,331
CME Group, Inc.                                               9,641        3,694
Comerica, Inc.                                               27,144          696
Countrywide Financial Corp.                                 100,246          426
Developers Diversified Realty Corp.                          20,024          695
Discover Financial Services                                  85,605        1,127
E*Trade Financial Corp. (a)                                  81,315          255
Equity Residential                                           49,057        1,877
Fannie Mae                                                  189,550        3,698
Federal Home Loan Mortgage Corp.                            117,439        1,926
Federated Investors, Inc. Class B                            15,270          526
Fidelity National Information Services, Inc.                 30,977        1,143
Fifth Third Bancorp                                         108,216        1,102
First Horizon National Corp.                                 38,372          285
Franklin Resources, Inc.                                     28,380        2,601
General Growth Properties, Inc.                              48,893        1,713
Genworth Financial, Inc. Class A                             79,351        1,413
Goldman Sachs Group, Inc.                                    70,570       12,343
Hartford Financial Services Group, Inc.                      56,197        3,629
HCP, Inc.                                                    43,100        1,371
Hudson City Bancorp, Inc.                                    95,292        1,590
Huntington Bancshares, Inc.                                  64,656          373
IntercontinentalExchange, Inc. (a)                           12,680        1,446
J.P. Morgan Chase & Co.                                     618,015       21,204
Janus Capital Group, Inc.                                    26,407          699
KeyCorp                                                      86,875          954


                       See Notes to Financial Statements


                                       4



STATE STREET EQUITY 500 INDEX PORTFOLIO
PORTFOLIO OF INVESTMENTS - (CONTINUED)
JUNE 30, 2008 (UNAUDITED)



                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
FINANCIALS -- (CONTINUED)
Kimco Realty Corp.                                           45,869   $    1,583
Legg Mason, Inc.                                             26,342        1,148
Lehman Brothers Holdings, Inc.                              127,128        2,518
Leucadia National Corp.                                      31,136        1,462
Lincoln National Corp.                                       46,692        2,116
Loews Corp.                                                  63,731        2,989
M & T Bank Corp.                                             14,137          997
Marsh & McLennan Cos., Inc.                                  91,753        2,436
Marshall & Ilsley Corp.                                      45,493          697
MBIA, Inc.                                                   41,484          182
Merrill Lynch & Co., Inc.                                   174,490        5,533
MetLife, Inc.                                               126,456        6,673
MGIC Investment Corp.                                        18,100          111
Moody's Corp.                                                35,466        1,221
Morgan Stanley                                              197,230        7,114
National City Corp.                                         145,254          693
Northern Trust Corp.                                         33,806        2,318
NYSE Euronext                                                48,100        2,437
Plum Creek Timber Co., Inc.                                  30,811        1,316
PNC Financial Services Group, Inc.                           62,951        3,595
Principal Financial Group, Inc.                              46,591        1,955
Progressive Corp.                                           121,701        2,278
ProLogis                                                     45,591        2,478
Prudential Financial, Inc.                                   77,239        4,614
Public Storage, Inc.                                         22,787        1,841
Regions Financial Corp.                                     122,289        1,334
SAFECO Corp.                                                 15,250        1,024
Simon Property Group, Inc.                                   39,600        3,560
SLM Corp. (a)                                                83,254        1,611
Sovereign Bancorp, Inc.                                      85,574          630
State Street Corp. (b)                                       75,725        4,846
SunTrust Banks, Inc.                                         62,218        2,254
T. Rowe Price Group, Inc.                                    47,075        2,658
Torchmark Corp.                                              15,621          916
Travelers Cos, Inc.                                         107,104        4,648
U.S. Bancorp                                                309,152        8,622
Unum Group                                                   61,629        1,260
Vornado Realty Trust                                         23,734        2,089
Wachovia Corp.                                              379,778        5,898
Washington Mutual, Inc.                                     184,441          909
Wells Fargo Co.                                             589,093       13,991
Western Union Co.                                           130,185        3,218
XL Capital, Ltd. Class A                                     33,044          679
Zions Bancorp                                                17,953          565
                                                                      ----------
                                                                         287,140
                                                                      ----------
HEALTH CARE -- 11.5%
Abbott Laboratories                                         276,406       14,641
Aetna, Inc.                                                  88,050        3,569
Allergan, Inc.                                               54,092        2,816
AmerisourceBergen Corp.                                      29,893        1,195
Amgen, Inc. (a)                                             194,036        9,151
Applera Corp. - Applied Biosystems Group                     29,573          990
Barr Pharmaceuticals, Inc. (a)                               18,923          853




                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
Baxter International, Inc.                                  112,561   $    7,197
Becton, Dickinson & Co.                                      43,597        3,544
Biogen Idec, Inc. (a)                                        51,431        2,875
Boston Scientific Corp. (a)                                 243,834        2,997
Bristol-Myers Squibb Co.                                    351,338        7,213
C.R. Bard, Inc.                                              17,597        1,548
Cardinal Health, Inc.                                        64,557        3,330
Celgene Corp. (a)                                            77,318        4,938
CIGNA Corp.                                                  48,796        1,727
Coventry Health Care, Inc. (a)                               27,603          840
Covidien Ltd.                                                88,504        4,239
Eli Lilly & Co.                                             175,675        8,109
Express Scripts, Inc. (a)                                    44,699        2,804
Forest Laboratories, Inc. (a)                                54,802        1,904
Genzyme Corp. (a)                                            48,492        3,492
Gilead Sciences, Inc. (a)                                   165,799        8,779
Hospira, Inc. (a)                                            28,503        1,143
Humana, Inc. (a)                                             31,507        1,253
IMS Health, Inc.                                             34,732          809
Intuitive Surgical, Inc. (a)                                  6,900        1,859
Johnson & Johnson                                           502,649       32,340
King Pharmaceuticals, Inc. (a)                               39,792          417
Laboratory Corp. of America Holdings (a)                     19,222        1,338
McKesson Corp.                                               48,655        2,720
Medco Health Solutions, Inc. (a)                             89,568        4,228
Medtronic, Inc.                                             200,578       10,380
Merck & Co., Inc.                                           382,019       14,398
Millipore Corp. (a)                                           9,535          647
Mylan Laboratories Inc. (a)                                  51,709          624
Patterson Cos., Inc. (a)                                     21,594          635
Pfizer, Inc.                                              1,209,271       21,126
Quest Diagnostics, Inc.                                      28,100        1,362
Schering-Plough Corp.                                       288,655        5,684
St. Jude Medical, Inc. (a)                                   60,726        2,483
Stryker Corp.                                                43,389        2,728
Tenet Healthcare Corp. (a)                                   76,270          424
Thermo Fisher Scientific, Inc. (a)                           75,524        4,209
UnitedHealth Group, Inc.                                    217,996        5,722
Varian Medical Systems, Inc. (a)                             22,860        1,185
Watson Pharmaceuticals, Inc. (a)                             17,346          471
Wellpoint, Inc. (a)                                          93,138        4,439
Wyeth                                                       238,987       11,462
Zimmer Holdings, Inc. (a)                                    42,152        2,868
                                                                      ----------
                                                                         235,705
                                                                      ----------
INDUSTRIALS -- 11.1%
3M Co.                                                      126,372        8,794
Allied Waste Industries, Inc. (a)                            60,230          760
Avery Dennison Corp.                                         18,988          834
Boeing Co.                                                  133,788        8,793
Burlington Northern Santa Fe Corp.                           52,382        5,232
Caterpillar, Inc.                                           109,379        8,074
CH Robinson Worldwide, Inc.                                  30,461        1,671
Cintas Corp.                                                 25,088          665
Cooper Industries, Ltd.                                      32,034        1,265


                       See Notes to Financial Statements


                                       5



STATE STREET EQUITY 500 INDEX PORTFOLIO
PORTFOLIO OF INVESTMENTS - (CONTINUED)
JUNE 30, 2008 (UNAUDITED)



                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
INDUSTRIALS -- (CONTINUED)
CSX Corp.                                                    71,638   $    4,500
Cummins, Inc.                                                35,358        2,317
Danaher Corp.                                                45,086        3,485
Deere & Co.                                                  77,737        5,607
Domtar Corp. (a) (c)                                             11           --
Dover Corp.                                                  34,295        1,659
Eaton Corp.                                                  28,795        2,447
Emerson Electric Co.                                        140,348        6,940
Equifax, Inc.                                                23,683          796
Expeditors International Washington, Inc.                    37,320        1,605
FedEx Corp.                                                  55,100        4,341
Fluor Corp. (a)                                              15,630        2,908
General Dynamics Corp.                                       71,661        6,034
General Electric Co.                                      1,782,233       47,568
Goodrich Co.                                                 22,145        1,051
Honeywell International, Inc.                               132,781        6,676
Illinois Tool Works, Inc.                                    72,471        3,443
Ingersoll-Rand Co. Class A                                   55,057        2,061
ITT Industries, Inc.                                         33,292        2,108
Jacobs Engineering Group, Inc. (a)                           21,700        1,751
L-3 Communications Holdings, Inc.                            22,303        2,027
Lockheed Martin Corp.                                        59,852        5,905
Manitowoc Co., Inc.                                          24,000          781
Masco Corp.                                                  67,523        1,062
Monster Worldwide, Inc. (a)                                  22,609          466
Norfolk Southern Corp.                                       66,755        4,184
Northrop Grumman Corp.                                       60,811        4,068
PACCAR, Inc.                                                 64,874        2,714
Pall Corp.                                                   22,209          881
Parker-Hannifin Corp.                                        29,603        2,111
Pitney Bowes, Inc.                                           36,727        1,252
Precision Castparts Corp.                                    25,307        2,439
R.R. Donnelley & Sons Co.                                    38,309        1,137
Raytheon Co.                                                 75,882        4,271
Robert Half International, Inc.                              26,240          629
Rockwell Automation, Inc.                                    27,505        1,203
Rockwell Collins, Inc.                                       29,731        1,426
Ryder Systems, Inc.                                           9,821          677
Southwest Airlines Co.                                      128,486        1,675
Terex Corp. (a)                                              17,435          896
Textron, Inc.                                                45,239        2,168
Total System Services, Inc.                                  37,575          835
Tyco Electronics Ltd.                                        86,204        3,088
Tyco International Ltd.                                      87,761        3,514
Union Pacific Corp.                                          92,568        6,989
United Parcel Service, Inc. Class B                         181,846       11,178
United Technologies Corp.                                   173,078       10,679
W.W. Grainger, Inc.                                          12,169          995
Waste Management, Inc.                                       88,439        3,335
                                                                      ----------
                                                                         225,970
                                                                      ----------
INFORMATION TECHNOLOGY -- 15.5%
Adobe Systems, Inc. (a)                                      93,857        3,697
Advanced Micro Devices, Inc. (a)                            114,986          670




                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
Affiliated Computer Services, Inc. Class A (a)               16,737   $      895
Agilent Technologies, Inc. (a)                               63,768        2,266
Akamai Technologies, Inc. (a)                                29,424        1,024
Altera Corp.                                                 52,854        1,094
Analog Devices, Inc.                                         50,269        1,597
Apple Computer, Inc. (a)                                    157,484       26,369
Applied Materials, Inc.                                     240,707        4,595
Autodesk, Inc. (a)                                           41,876        1,416
Automatic Data Processing, Inc.                              92,817        3,889
BMC Software, Inc. (a)                                       35,721        1,286
Broadcom Corp. Class A (a)                                   78,159        2,133
CA, Inc.                                                     68,199        1,575
CIENA Corp. (a)                                              14,529          337
Cisco Systems, Inc. (a)                                   1,055,219       24,544
Citrix Systems, Inc. (a)                                     33,467          984
Cognizant Technology Solutions Corp. Class A (a)             50,084        1,628
Computer Sciences Corp. (a)                                  25,944        1,215
Compuware Corp. (a)                                          41,450          395
Convergys Corp. (a)                                          20,035          298
Corning, Inc.                                               280,676        6,470
Dell, Inc. (a)                                              363,550        7,954
Electronic Arts, Inc. (a)                                    55,800        2,479
Electronic Data Systems Corp.                                91,816        2,262
EMC Corp. (a)                                               366,084        5,378
Fiserv, Inc. (a)                                             29,952        1,359
Google, Inc. Class A (a)                                     41,490       21,841
Hewlett-Packard Co.                                         440,316       19,466
IAC (a)                                                      34,889          673
Intel Corp.                                               1,022,956       21,973
International Business Machines Corp.                       245,442       29,092
Intuit, Inc. (a)                                             58,463        1,612
Jabil Circuit, Inc.                                          39,951          656
Juniper Networks, Inc. (a)                                   92,093        2,043
KLA-Tencor Corp.                                             30,405        1,238
Lexmark International Group, Inc. Class A (a)                15,842          530
Linear Technology Corp.                                      40,863        1,331
LSI Logic Corp. (a)                                         112,662          692
MEMC Electronic Materials, Inc. (a)                          40,878        2,516
Microchip Technology, Inc.                                   33,189        1,014
Micron Technology, Inc. (a)                                 142,362          854
Microsoft Corp.                                           1,431,835       39,390
Molex, Inc.                                                  24,805          606
Motorola, Inc.                                              399,965        2,936
National Semiconductor Corp.                                 41,596          854
NetApp, Inc. (a)                                             61,157        1,325
Novell, Inc. (a)                                             68,720          405
Novellus Systems, Inc. (a)                                   20,030          424
NVIDIA Corp. (a)                                            100,756        1,886
Oracle Corp. (a)                                            707,762       14,863
Paychex, Inc.                                                58,038        1,815
PerkinElmer, Inc.                                            21,118          588
QLogic Corp. (a)                                             24,322          355


                       See Notes to Financial Statements


                                       6



STATE STREET EQUITY 500 INDEX PORTFOLIO
PORTFOLIO OF INVESTMENTS - (CONTINUED)
JUNE 30, 2008 (UNAUDITED)



                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
INFORMATION TECHNOLOGY -- (CONTINUED)
QUALCOMM, Inc.                                              288,011   $   12,779
SanDisk Corp. (a)                                            40,167          751
Sun Microsystems, Inc. (a)                                  144,741        1,575
Symantec Corp. (a)                                          152,663        2,954
Tellabs, Inc. (a)                                            73,830          343
Teradata Corp. (a)                                           33,520          776
Teradyne, Inc. (a)                                           27,649          306
Texas Instruments, Inc.                                     236,399        6,657
Unisys Corp. (a)                                             69,807          276
VeriSign, Inc. (a)                                           33,421        1,263
Waters Corp. (a)                                             16,965        1,094
Xerox Corp.                                                 161,834        2,194
Xilinx, Inc.                                                 52,602        1,328
Yahoo!, Inc. (a)                                            246,219        5,087
                                                                      ----------
                                                                         316,170
                                                                      ----------
MATERIALS -- 4.3%
Air Products & Chemicals, Inc.                               38,009        3,758
AK Steel Holding Corp.                                       20,000        1,380
Alcoa, Inc.                                                 144,949        5,163
Allegheny Technologies, Inc.                                 17,528        1,039
Ashland, Inc.                                                10,700          516
Ball Corp.                                                   17,562          838
Bemis Co., Inc.                                              17,262          387
Consol Energy, Inc.                                          32,073        3,604
Dow Chemical Co.                                            167,428        5,845
E.I. Du Pont de Nemours & Co.                               160,412        6,880
Eastman Chemical Co.                                         14,204          978
Ecolab, Inc.                                                 31,366        1,348
Freeport-McMoRan Copper & Gold, Inc. Class B                 68,252        7,998
Hercules, Inc.                                               23,050          390
International Flavors & Fragrances, Inc.                     14,331          560
International Paper Co.                                      76,311        1,778
Massey Energy Co.                                            14,300        1,341
MeadWestvaco Corp.                                           32,320          771
Monsanto Co.                                                 97,955       12,385
Newmont Mining Corp.                                         80,406        4,194
Nucor Corp.                                                  55,954        4,178
Pactiv Corp. (a)                                             23,915          508
Peabody Energy Corp.                                         48,324        4,255
PPG Industries, Inc.                                         29,871        1,714
Praxair, Inc.                                                55,711        5,250
Rohm & Haas Co.                                              21,706        1,008
Sealed Air Corp.                                             28,492          542
Sigma-Aldrich Corp.                                          23,834        1,284
Titanium Metals Corp.                                        16,600          232
United States Steel Corp.                                    20,978        3,876
Vulcan Materials Co.                                         19,361        1,157
Weyerhaeuser Co.                                             36,937        1,889
                                                                      ----------
                                                                          87,046
                                                                      ----------
TELECOMMUNICATION SERVICES -- 3.3%
American Tower Corp. (a)                                     71,500        3,021
AT&T, Inc.                                                1,061,950       35,777




                                                                        MARKET
                                                                         VALUE
                                                           SHARES        (000)
                                                         ----------   ----------
                                                                
CenturyTel, Inc.                                             20,441   $      728
Citizens Communications Co.                                  60,384          685
Embarq Corp.                                                 27,597        1,305
Fairpoint Communications, Inc. (c)                                8           --
JDS Uniphase Corp. (a)                                       42,723          485
Qwest Communications International, Inc.                    283,890        1,116
Sprint Nextel Corp.                                         504,565        4,793
Verizon Communications, Inc.                                508,766       18,010
Windstream Corp.                                             79,613          982
                                                                      ----------
                                                                          66,902
                                                                      ----------
UTILITIES -- 4.2%
AES Corp. (a)                                               117,495        2,257
Allegheny Energy, Inc.                                       30,759        1,541
Ameren Corp.                                                 38,360        1,620
American Electric Power Co., Inc.                            72,652        2,923
CenterPoint Energy, Inc.                                     57,611          925
CMS Energy Corp.                                             38,856          579
Consolidated Edison, Inc.                                    47,752        1,867
Constellation Energy Group, Inc.                             31,414        2,579
Dominion Resources, Inc.                                    102,562        4,871
DTE Energy Co.                                               27,984        1,188
Duke Energy Corp.                                           224,120        3,895
Dynegy, Inc. (a)                                             82,690          707
Edison International                                         59,219        3,043
Entergy Corp.                                                34,098        4,108
Exelon Corp.                                                116,621       10,491
FirstEnergy Corp.                                            54,107        4,455
FPL Group, Inc.                                              72,421        4,749
Integrys Energy Group, Inc.                                  12,916          657
Nicor, Inc.                                                   9,100          388
NiSource, Inc.                                               49,982          896
Pepco Holdings, Inc.                                         36,900          946
PG&E Corp.                                                   64,726        2,569
Pinnacle West Capital Corp.                                  17,760          546
PPL Corp.                                                    66,075        3,454
Progress Energy, Inc.                                        46,981        1,965
Public Service Enterprise Group, Inc.                        90,124        4,139
Questar Corp.                                                30,268        2,150
Sempra Energy                                                43,786        2,472
Southern Co.                                                135,943        4,747
Southwestern Energy Co. (a)                                  61,200        2,914
Spectra Energy Corp.                                        111,598        3,207
TECO Energy, Inc.                                            35,651          766
Xcel Energy, Inc.                                            77,251        1,550
                                                                      ----------
                                                                          85,164
                                                                      ----------
TOTAL COMMON STOCKS
   (Cost $1,381,101,228)                                               1,995,129
                                                                      ----------


                       See Notes to Financial Statements


                                       7



STATE STREET EQUITY 500 INDEX PORTFOLIO
PORTFOLIO OF INVESTMENTS - (CONTINUED)
JUNE 30, 2008 (UNAUDITED)



                                                            PAR         MARKET
                                                           AMOUNT        VALUE
                                                            (000)        (000)
                                                         ----------   ----------
                                                                
U.S. GOVERNMENT SECURITIES -- 0.1%
United States Treasury Bill
   1.9% due 09/11/08 (d) (e)                             $    2,936   $    2,925
                                                                      ----------
TOTAL U.S. GOVERNMENT SECURITIES
   (Cost $2,924,843)                                                       2,925
                                                                      ----------




                                                                        MARKET
                                                           SHARES        VALUE
                                                            (000)        (000)
                                                         ----------   ----------
                                                                
MONEY MARKET FUNDS -- 1.8%
AIM Short Term Investment Prime Portfolio                    36,185   $   36,185
Federated Money Market Obligations Trust                        564          564
                                                                      ----------
TOTAL MONEY MARKET FUNDS
   (Cost $36,749,196)                                                     36,749
                                                                      ----------
TOTAL INVESTMENTS -- 99.5%
   (identified cost $1,420,775,267)(f)                                 2,034,803
OTHER ASSETS IN EXCESS OF LIABILITIES -- 0.5%                             10,846
                                                                      ----------
NET ASSETS -- 100.0%                                                  $2,045,649
                                                                      ==========


(a)  Non-income producing security.

(b)  Affiliated issuer. See table that follows for more information.

(c)  Amount is less than $1,000.

(d)  Security held as collateral in relation to initial margin requirements on
     futures contracts.

(e)  Rate represents annualized yield at date of purchase.

(f)  Cost of investments shown approximates cost for federal income tax
     purposes.

                       See Notes to Financial Statements


                                       8



STATE STREET EQUITY 500 INDEX PORTFOLIO
PORTFOLIO OF INVESTMENTS
JUNE 30, 2008 (UNAUDITED)



                                                                     UNREALIZED
                                                        NUMBER OF   DEPRECIATION
                                                        CONTRACTS       (000)
                                                        ---------   ------------
                                                              
Schedule of Futures Contracts
S&P 500 Financial Futures Contracts (long) Expiration
   Date 09/2008                                            791        $(2,706)
                                                                      -------
Total unrealized depreciation on open futures
   contracts purchased                                                $(2,706)
                                                                      =======


                                AFFILIATE TABLE



                                                                                                         Income Earned   Realized
                                                            Shares sold                                     for the       Gain on
                                        Shares purchased      for the                         Value at      6 months      shares
Security             Number of shares   for the 6 months      6 months     Number of shares    6/30/08   ended 6/30/08     sold
Description          held at 12/31/07     ended 6/30/08    ended 6/30/08    held at 6/30/08     (000)        (000)         (000)
- -----------          ----------------   ----------------   -------------   ----------------   --------   -------------   --------
                                                                                                    
State Street Corp.        70,325              9,100            3,700            75,725         $4,846         $34           $59


                       See Notes to Financial Statements


                                       9



STATE STREET EQUITY 500 INDEX PORTFOLIO

STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 2008 (UNAUDITED)
(Amounts in thousands)


                                                                                    
ASSETS
Investments in unaffiliated issuers at market (identified cost $1,417,431)             $2,029,957
Investments in non-controlled affiliates at market (identified cost $3,344) (Note 4)        4,846
                                                                                       ----------
Receivables:                                                                            2,034,803
   Investment securities sold                                                               9,502
   Daily variation margin on futures contracts                                                 40
   Dividends and interest                                                                   2,763
                                                                                       ----------
      Total assets                                                                      2,047,108
LIABILITIES
Payables:
   Investment securities purchased                                                          1,380
   Management fees (Note 4)                                                                    79
                                                                                       ----------
      Total liabilities                                                                     1,459
                                                                                       ----------
NET ASSETS                                                                             $2,045,649
                                                                                       ==========


                       See Notes to Financial Statements.


                                       10



STATE STREET EQUITY 500 INDEX PORTFOLIO

STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 2008 (UNAUDITED)
(Amounts in thousands)


                                                              
INVESTMENT INCOME
   Dividend income - unaffiliated issuers                           $  22,512
   Dividend income - non-controlled affiliated issuer                      34
   Interest                                                               700
                                                                    ---------
      Total Investment Income                                          23,246
                                                                    ---------
EXPENSES
   Management fees (Note 4)                             $     495
                                                        ---------
      Total Expenses                                                      495
                                                                    ---------
NET INVESTMENT INCOME                                                  22,751
                                                                    ---------
REALIZED AND UNREALIZED GAIN (LOSS)
Net realized gain (loss) on:
   Investments - unaffiliated issuers                      16,145
   Investments - non-controlled affiliated issuer              59
   Futures contracts                                       (3,936)
                                                        ---------
                                                                       12,268
Net change in net unrealized depreciation on:
   Investments                                           (318,954)
   Futures contracts                                       (3,381)
                                                        ---------
                                                                     (322,335)
                                                                    ---------
Net realized and unrealized loss                                     (310,067)
                                                                    ---------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                $(287,316)
                                                                    =========


                       See Notes to Financial Statements.


                                       11


STATE STREET EQUITY 500 INDEX PORTFOLIO

STATEMENTS OF CHANGES IN NET ASSETS
(Amounts in thousands)



                                                                   For the
                                                              Six Months Ended     For the Year
                                                                June 30, 2008         Ended
                                                                (Unaudited)      December 31, 2007
                                                              ----------------   -----------------
                                                                           
INCREASE (DECREASE) IN NET ASSETS FROM:
OPERATIONS
   Net Investment Income                                         $   22,751         $   53,117
   Net realized gain on investments and futures contracts            12,268            169,211
   Net change in net unrealized appreciation (depreciation)        (322,335)           (66,481)
                                                                 ----------         ----------
      Net increase in net assets resulting from operations         (287,316)           155,847
                                                                 ----------         ----------
CAPITAL TRANSACTIONS
   Proceeds from contributions                                      159,368            328,812
   Fair value of withdrawals                                       (248,780)          (765,322)
   Withdrawals in-kind                                                   --            (63,656)
                                                                 ----------         ----------
   Net decrease in net assets from capital transactions             (89,412)          (500,166)
                                                                 ----------         ----------
TOTAL NET INCREASE (DECREASE) IN NET ASSETS                        (376,728)          (344,319)
NET ASSETS
Beginning of period                                               2,422,377          2,766,696
                                                                 ----------         ----------
End of period                                                    $2,045,649         $2,422,377
                                                                 ==========         ==========


                       See Notes to Financial Statements.


                                       12



STATE STREET EQUITY 500 INDEX PORTFOLIO

FINANCIAL HIGHLIGHTS

The following table includes selected supplemental data and ratios to average
net assets:



                                   Six Months
                                      Ended           Year         Year          Year         Year         Year
                                     6/30/08         Ended         Ended        Ended        Ended        Ended
                                   (Unaudited)      12/31/07     12/31/06      12/31/05     12/31/04     12/31/03
                                   -----------     ----------   ----------    ----------   ----------   ----------
                                                                                      
SUPPLEMENTAL DATA AND RATIOS:
   Net assets, end of period
      (in thousands)               $2,045,649      $2,422,377   $2,766,696    $2,453,109   $2,767,467   $2,714,672
   Ratios to average net assets:
      Operating expenses                0.045%+         0.045%       0.045%        0.045%       0.045%       0.045%
      Net investment income              2.07%+          1.96%        1.94%         1.84%        1.97%        1.74%
   Portfolio turnover rate*                 6%++           12%          10%            8%           9%          12%
   Total return (a)                    (11.98)%++        5.49%       15.75%         4.87%       10.86%       28.62%


- ----------
*    The portfolio turnover rate excludes in-kind security transactions.

+    Annualized

++   Not Annualized

(a)  Results represent past performance and are not indicative of future
     results.

                       See Notes to Financial Statements.


                                       13



STATE STREET EQUITY 500 INDEX PORTFOLIO
NOTES TO FINANCIAL STATEMENTS
JUNE 30, 2008 (UNAUDITED)

1. ORGANIZATION

State Street Master Funds (the "Trust") is registered under the Investment
Company Act of 1940, as amended (the "1940 Act"), as an open-end management
investment company, and was organized as a business trust under the laws of The
Commonwealth of Massachusetts on July 27, 1999. The Trust comprises eleven
investment portfolios: the State Street Equity 500 Index Portfolio, the State
Street Equity 400 Index Portfolio, the State Street Equity 2000 Index Portfolio,
the State Street Aggregate Bond Index Portfolio, the State Street Money Market
Portfolio, the State Street Tax Free Money Market Portfolio, the State Street
Short-Term Tax Exempt Bond Portfolio, the State Street Limited Duration Bond
Portfolio, the State Street Treasury Money Market Portfolio, the State Street
Treasury Plus Money Market Portfolio and the State Street U.S. Government Money
Market Portfolio. Information presented in these financial statements pertains
only to the State Street Equity 500 Index Portfolio (the "Portfolio"). At June
30, 2008, only the Portfolio, the State Street Money Market Portfolio, the State
Street Tax Free Money Market Portfolio, the State Street Short-Term Tax Exempt
Bond Portfolio, the State Street Treasury Money Market Portfolio, the State
Street Treasury Plus Money Market Portfolio and the State Street U.S. Government
Money Market Portfolio were in operation. The Portfolio is authorized to issue
an unlimited number of non-transferable beneficial interests.

The Portfolio's investment objective is to replicate, as closely as possible,
before expenses, the performance of the Standard & Poor's 500 Composite Stock
Price Index (the "S&P 500(R) Index"). The Portfolio uses a passive management
strategy designed to track the performance of the S&P 500(R) Index. The S&P
500(R) Index is a well-known, unmanaged, stock index that includes common stocks
of 500 companies from several industrial sectors representing a significant
portion of the market value of all stocks publicly traded in the United States.
There is no assurance that the Portfolio will achieve its objective.

2. SIGNIFICANT ACCOUNTING POLICIES

The following is a summary of the significant accounting policies consistently
followed by the Portfolio in the preparation of its financial statements.

SECURITY VALUATION: The Portfolio's investments are valued each business day by
independent pricing services. Equity securities for which market quotations are
available are valued at the last sale price or official closing price (closing
bid price if no sale has occurred) on the primary market or exchange on which
they trade. Investments in other mutual funds are valued at the net asset value
per share. Fixed-income securities and options are valued on the basis of the
closing bid price. Futures contracts are valued on the basis of the last sale
price. Money market instruments maturing within 60 days of the valuation date
are valued at amortized cost, a method by which each money market instrument is
initially valued at cost, and thereafter a constant accretion or amortization of
any discount or premium is recorded until maturity of the security. The
Portfolio may value securities for which market quotations are not readily
available at "fair value," as determined in good faith pursuant to procedures
established by the Board of Trustees.

The Portfolio adopted Financial Accounting Standards Board Statement of
Financial Accounting Standards No. 157, Fair Value Measurements ("FAS 157"),
effective for financial statements issued for fiscal years beginning after
November 15, 2007 and interim periods within those fiscal years. In accordance
with FAS 157, fair value is defined as the price that the portfolio would
receive upon selling an investment in a timely transaction to an independent
buyer in the principal or most advantageous market of the investment. Various
inputs are used in determining the value of the Fund's investments. FAS 157
established a three tier hierarchy of inputs to establish a classification of
fair value measurements and disclosure. The three tier hierarchy of inputs is
summarized below:

     -    Level 1 - quoted prices in active markets for identical securities

     -    Level 2 - other significant observable inputs (including quoted prices
          for similar securities, interest rates, prepayment speeds, credit
          risk, etc.)

     -    Level 3 - significant unobservable inputs (including the Fund's own
          assumptions in determining the fair value of investments)


                                       14


STATE STREET EQUITY 500 INDEX PORTFOLIO
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
JUNE 30, 2008 (UNAUDITED)

The inputs or methodology used for valuing securities are not an indication of
the risk associated with investing in those securities.

The following is a summary of the inputs used, as of June 30, 2008, in valuing
the Fund's assets carried at fair value:



                                                 INVESTMENTS IN   OTHER FINANCIAL
VALUATION INPUTS                                   SECURITIES       INSTRUMENTS*
- ----------------                                 --------------   ---------------
                                                            
Level 1 - Quoted Prices                          $1,995,129,310     $(2,705,707)
Level 2 - Other Significant Observable Inputs        39,674,039              --
Level 3 - Significant Unobservable Inputs                    --              --
                                                 --------------     -----------
   TOTAL                                         $2,034,803,349     $(2,705,707)
                                                 ==============     ===========


*    Other financial instruments include futures contracts.

SECURITIES TRANSACTIONS, INVESTMENT INCOME AND EXPENSES: Securities transactions
are recorded on a trade date basis for financial statement purposes. Dividend
income is recorded on the ex-dividend date. Interest income is recorded daily on
the accrual basis and includes amortization of premium and accretion of discount
on investments. Realized gains and losses from securities transactions are
recorded on the basis of identified cost. Expenses are accrued daily based on
average daily net assets.

All of the net investment income and realized and unrealized gains and losses
from the security transactions of the Portfolio are allocated pro rata among the
partners in the Portfolio based on each partner's daily ownership percentage.

FEDERAL INCOME TAXES: The Portfolio is not required to pay federal income taxes
on its net investment income and net capital gains because it is treated as a
partnership for federal income tax purposes. All interest, dividends, gains and
losses of the Portfolio are deemed to have been "passed through" to the
Portfolio's partners in proportion to their holdings in the Portfolio,
regardless of whether such items have been distributed by the Portfolio. Each
partner is responsible for tax liability based on its distributive share;
therefore, no provision has been made for federal income taxes.

The Portfolio adopted the provisions of Financial Accounting Standards Board
Interpretation No. 48 (FIN 48), "Accounting for Uncertainty in Income Taxes", on
June 29, 2007. As of and during the period ended June 30, 2008, the Portfolio
did not have a liability for any unrecognized tax expenses. The Portfolio
recognizes interest and penalties, if any, related to tax liabilities as income
tax expense in the Statement of Operations. As of June 30, 2008, tax years 2004
through 2007 remain subject to examination by the portfolio's major tax
jurisdictions, which include the United States of America and the Commonwealth
of Massachusetts.

FUTURES: The Portfolio may enter into financial futures contracts as part of its
strategy to track the performance of the S&P 500(R) Index. Upon entering into a
futures contract, the Portfolio is required to deposit with the broker cash or
securities in an amount equal to a certain percentage of the contract amount.
Variation margin payments are made or received by the Portfolio each day,
depending on the daily fluctuations in the value of the underlying security or
index, and are recorded for financial statement purposes as unrealized gains or
losses by the Portfolio. The Portfolio recognizes a realized gain or loss when
the contract is closed. The Portfolio voluntarily segregates securities in an
amount equal to the outstanding value of the open futures contracts in
accordance with Securities and Exchange Commission requirements.

The primary risks associated with the use of futures contracts are an imperfect
correlation between the change in market value of the securities held by the
Portfolio and the prices of futures contracts and the possibility of an illiquid
market.

USE OF ESTIMATES: The Portfolio's financial statements are prepared in
accordance with U.S. generally accepted accounting principles that require the
use of management estimates. Actual results could differ from those estimates.


                                       15



STATE STREET EQUITY 500 INDEX PORTFOLIO
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
JUNE 30, 2008 (UNAUDITED)

3. SECURITIES TRANSACTIONS

For the six months June 30, 2008, purchases and sales of investment securities,
excluding short-term investments, futures contracts, and contributions in-kind
and fair value of withdrawals, aggregated to $126,676,195 and $203,832,247,
respectively.

At June 30, 2008, the book cost of investments was $1,420,775,267 which
approximates cost computed on a federal tax basis. The aggregate gross
unrealized appreciation and gross unrealized depreciation was $761,630,535 and
$147,602,453, respectively, resulting in net appreciation of $614,028,082 for
all securities as computed on a federal income tax basis.

The difference between book and tax cost amounts are primarily due to wash sale
loss deferrals.

4. RELATED PARTY FEES AND TRANSACTIONS

The Portfolio has entered into an investment advisory agreement with SSgA Funds
Management, Inc. ("SSgA FM" or the "Adviser"), a subsidiary of State Street
Corp. and an affiliate of State Street Bank and Trust Company ("State Street"),
under which SSgA FM directs the investments of the Portfolio in accordance with
its investment objective, policies, and limitations. The Trust has contracted
with State Street to provide custody, administration and transfer agent services
to the Portfolio. In compensation for SSgA FM's services as investment adviser
and for State Street's services as administrator, custodian and transfer agent
(and for assuming ordinary operating expenses of the Portfolio, including
ordinary legal, audit and trustees expense), State Street receives a unitary
fee, calculated daily, at the annual rate of 0.045% of the Portfolio's average
daily net assets.

Certain investments made by the Portfolio were made in securities affiliated
with State Street and SSgA FM. Investments in State Street Corp., the holding
company of State Street, were made according to its representative portion of
the S&P 500(R) Index. The market value of this investment at June 30, 2008 is
listed in the Portfolio of Investments.

5. TRUSTEES' FEES

Pursuant to certain agreements with State Street and its affiliates, each
Independent Trustee receives for his or her services a $30,000 retainer in
addition to $2,500 for each in-person meeting and $500 for each telephonic
meeting from State Street or its affiliates.

6. INDEMNIFICATIONS

The Trust's organizational documents provide that its officers and trustees are
indemnified against certain liabilities arising out of the performance of their
duties to the Trust. In addition, both in some of its principal service
contracts and in the normal course of its business, the Trust enters into
contracts that provide indemnifications to other parties for certain types of
losses or liabilities. The Trust's maximum exposure under these arrangements is
unknown as this could involve future claims against the Trust. Management does
not expect any significant claims.

7. NEW ACCOUNTING PRONOUNCEMENTS

In March 2008, the Financial Accounting Standards board ("FASB") issued
Statement of Financial Accounting Standards No. 161, "Disclosures about
Derivative Instruments and Hedging Activities" ("SFAS 161"). SFAS 161 is
effective for fiscal years and interim periods beginning after November 15,
2008. SFAS 161 requires enhanced disclosures about Funds' derivative and hedging
activities. Management is currently evaluating the impact the adoption of SFAS
161 will have on the Funds' financial statement disclosures.


                                       16



STATE STREET EQUITY 500 INDEX PORTFOLIO
JUNE 30, 2008

GENERAL INFORMATION (UNAUDITED)

PROXY VOTING POLICIES AND PROCEDURES AND RECORD

The Trust has adopted proxy voting procedures relating to portfolio securities
held by the Portfolio. A description of the policies and procedures are
available (i) without charge, upon request, by calling (877) 521-4083 or (ii) on
the website of the Securities and Exchange Commission (the "SEC") at
www.sec.gov. Information on how the Portfolio voted proxies relating to
portfolio securities during the most recent 12-month period ended June 30 is
available by August 31 (i) without charge, upon request, by (i) calling (877)
521-4083 or (ii) on the SEC's website at www.sec.gov.

QUARTERLY PORTFOLIO SCHEDULE

The Trust files a complete schedule of portfolio holdings with the SEC for the
first and third quarters of its fiscal year (as of March and September of each
year) on Form N-Q. The Trust's Forms N-Q are available on the SEC's website at
www.sec.gov. The Trust's Forms N-Q may be reviewed and copied at the SEC's
Public Reference Room in Washington, D.C. and information on the operation of
the Public Reference Room may be obtained by calling 1-800-SEC-0330. The most
recent Form N-Q is available without charge, upon request, by calling (877)
521-4083.


                                       17



TRUSTEES
Michael F. Holland
William L. Boyan
Rina K. Spence
Douglas T. Williams
James E. Ross

INVESTMENT ADVISER
SSgA Funds Management, Inc.
State Street Financial Center
One Lincoln Street
Boston, MA 02111

ADMINISTRATOR, CUSTODIAN AND TRANSFER AGENT
State Street Bank and Trust Company
State Street Financial Center
One Lincoln Street
Boston, MA 02110

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
Ernst & Young LLP
200 Clarendon Street
Boston, MA 02116

LEGAL COUNSEL
Ropes & Gray LLP
One International Place
Boston, MA 02110

This report is for shareholder information. This is not a prospectus intended
for use in the purchase or sale of shares of beneficial interest.

STATE STREET EQUITY 500 INDEX PORTFOLIO
State Street Bank and Trust Company
P.O. Box 5049
Boston, MA 02206


                                       18


                           STATE STREET MASTER FUNDS

                               SEMI-ANNUAL REPORT

                                  JUNE 30, 2008
                                   (UNAUDITED)

                       STATE STREET MONEY MARKET PORTFOLIO

                  STATE STREET TAX FREE MONEY MARKET PORTFOLIO

               STATE STREET U.S. GOVERNMENT MONEY MARKET PORTFOLIO

                  STATE STREET TREASURY MONEY MARKET PORTFOLIO

                STATE STREET TREASURY PLUS MONEY MARKET PORTFOLIO



STATE STREET MASTER FUNDS

EXPENSE EXAMPLE

As a shareholder of the below listed Portfolios, you incur ongoing costs, which
include costs for portfolio management and administrative services, among
others. This example is intended to help you understand your ongoing costs (in
dollars) of investing in the Portfolio and to compare these costs with the
ongoing costs of investing in other mutual funds.

The example is based on an investment of $1,000 made at the beginning of the
period shown and held for the entire period from January 1, 2008 to June 30,
2008.

The table below illustrates your Portfolio's costs in two ways:

     -    BASED ON ACTUAL FUND RETURN. This section helps you to estimate the
          actual expenses that you paid over the period. The "Ending Account
          Value" shown is derived from the Portfolio's actual return, and the
          third column shows the dollar amount that would have been paid by an
          investor who started with $1,000 in the Portfolio. You may use the
          information here, together with the amount you invested, to estimate
          the expenses that you paid over the period.

          To do so, simply divide your account value by $1,000 (for example, an
          $8,600 account value divided by $1,000 = 8.6), then multiply the
          result by the number given for the Portfolio under the heading
          "Expenses Paid During Period".

     -    BASED ON HYPOTHETICAL 5% RETURN. This section is intended to help you
          compare your Portfolio's costs with those of other mutual funds. It
          assumes that the Portfolio had a yearly return of 5% before expenses,
          but that the expense ratio is unchanged. In this case- because the
          return used is not the Portfolio's actual return- the results do not
          apply to your investment. The example is useful in making comparisons
          because the Securities and Exchange Commission requires all mutual
          funds to calculate expenses based on a 5% return. You can assess your
          Portfolio's costs by comparing this hypothetical example with the
          hypothetical examples that appear in shareholder reports of other
          funds.

Six Months Ended June 30, 2008



                                            BEGINNING          ENDING      EXPENSES PAID
                                          ACCOUNT VALUE    ACCOUNT VALUE       DURING
                                         JANUARY 1, 2008   JUNE 30, 2008      PERIOD*
                                         ---------------   -------------   -------------
                                                                  
BASED ON ACTUAL PORTFOLIO RETURN
Money Market Portfolio                      $1,000.00        $1,016.60         $0.50
Tax Free Money Market Portfolio             $1,000.00        $1,012.40         $0.50
U.S. Government Money Market Portfolio      $1,000.00        $1,013.80         $0.65
Treasury Money Market Portfolio             $1,000.00        $1,008.50         $0.65
Treasury Plus Money Market Portfolio        $1,000.00        $1,011.10         $0.70



                                        1





                                            BEGINNING          ENDING      EXPENSES PAID
                                          ACCOUNT VALUE    ACCOUNT VALUE       DURING
                                         JANUARY 1, 2008   JUNE 30, 2008      PERIOD*
                                         ---------------   -------------   -------------
                                                                  
BASED ON HYPOTHETICAL (5% RETURN
   BEFORE EXPENSES)
Money Market Portfolio                      $1,000.00        $1,024.37         $0.50
Tax Free Money Market Portfolio             $1,000.00        $1,024.37         $0.50
U.S. Government Money Market Portfolio      $1,000.00        $1,024.22         $0.65
Treasury Money Market Portfolio             $1,000.00        $1,024.22         $0.65
Treasury Plus Money Market Portfolio        $1,000.00        $1,024.17         $0.70


*    The calculations are based on expenses incurred in the most recent fiscal
     period of the Portfolio. The Portfolio's annualized average weighted
     expense ratio as of June 30, 2008 was as follows:


                                      
Money Market Portfolio                   0.10%
Tax Free Money Market Portfolio          0.10%
U.S. Government Money Market Portfolio   0.13%
Treasury Money Market Portfolio          0.13%
Treasury Plus Money Market Portfolio     0.14%


The dollar amounts shown as "Expenses Paid" are equal to the annualized average
weighted expense ratio multiplied by the average account value over the period,
multiplied by the number of days in the most recent six-month period, then
divided by the number of days in the most recent 12-month period.


                                        2



STATE STREET MONEY MARKET PORTFOLIO
PORTFOLIO STATISTICS (UNAUDITED)



PORTFOLIO COMPOSITION*           JUNE 30, 2008
- ----------------------           -------------
                              
Yankee Certificates of Deposit        45.4%
Repurchase Agreements                 19.7
Commercial Paper                      10.3
Euro Certificates of Deposit           9.6
Bank Notes                             6.1
Medium Term Notes                      4.8
Certificates of Deposit                2.0
Master Note                            1.2
Promissory Notes                       0.6
Other assets less liabilities          0.3
                                    ------
Total                               100.00%
                                    ======




MATURITY LADDER                  JUNE 30, 2008
- ---------------                  -------------
                              
0-3 Days                               26.0%
4-90 Days                              65.3
90+ Days                                8.7
                                      -----
Total                                 100.0%
                                      =====
Average maturity                    40 Days


*    As a percentage of net assets as of the date indicated. The Portfolio's
     composition will vary over time.


                                        3


                       STATE STREET MONEY MARKET PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                            JUNE 30, 2008 (UNAUDITED)



                                                         INTEREST    MATURITY       PRINCIPAL        AMORTIZED
NAME OF ISSUER AND TITLE OF ISSUE                          RATE        DATE          AMOUNT            COST+
- ---------------------------------                        --------   ----------   --------------   --------------
                                                                                      
COMMERCIAL PAPER - 10.3%
BANK DOMESTIC - 4.7%
   Bank of America Corp.                                    2.615%  10/02/2008   $  100,000,000   $   99,324,458
   JPMorgan Chase & Co.                                     2.500%  08/12/2008      300,000,000      299,125,000
                                                                                                  --------------
                                                                                                     398,449,458
                                                                                                  --------------
BANK FOREIGN - 1.6%
   CBA (Delaware) Finance, Inc.                             2.730%  07/03/2008       37,488,000       37,482,314
   CBA (Delaware) Finance, Inc.                             2.730%  07/07/2008      100,000,000       99,954,500
                                                                                                  --------------
                                                                                                     137,436,814
                                                                                                  --------------
FINANCE CAPTIVE CONSUMER - 4.0%
   General Electric Capital Corp.                           2.830%  12/18/2008      350,000,000      345,322,639
                                                                                                  --------------
TOTAL COMMERCIAL PAPER                                                                               881,208,911
                                                                                                  --------------
CERTIFICATES OF DEPOSIT - 2.0%
BANK DOMESTIC - 2.0%
   Citibank                                                 2.980%  07/23/2008      175,000,000      175,000,000
                                                                                                  --------------
TOTAL CERTIFICATES OF DEPOSIT                                                                        175,000,000
                                                                                                  --------------
YANKEE CERTIFICATES OF DEPOSIT - 45.4%
BANK FOREIGN - 45.4%
   ABN AMRO Bank                                            2.640%  08/15/2008      250,000,000      250,001,552
   Australia New Zealand Cayman                             2.700%  07/17/2008      120,000,000      120,000,000
   Banco Santander                                          2.750%  07/17/2008      100,000,000      100,000,000
   Banco Santander                                          2.770%  08/12/2008      250,000,000      250,000,000
   Bank of Nova Scotia                                      2.550%  07/15/2008      150,000,000      150,000,000
   Bank of Nova Scotia                                      2.710%  07/03/2008      200,000,000      200,000,000
   Barclays Bank PLC(a)                                     2.805%  07/14/2008      125,000,000      125,000,000
   Barclays Bank PLC                                        3.150%  07/30/2008      100,000,000      100,000,000
   BNP Paribas                                              2.710%  09/12/2008      300,000,000      300,000,000
   BNP Paribas                                              2.710%  10/27/2008      100,000,000      100,000,000
   Calyon NY                                                2.920%  07/07/2008      100,000,000       99,999,959
   Dexia Credit Local NY                                    2.755%  07/14/2008      250,000,000      250,000,448
   Fortis Bank New York                                     2.700%  09/12/2008      150,000,000      150,000,000
   Lloyds Bank                                              2.610%  08/19/2008      100,000,000      100,001,352
   Rabobank Nederland                                       2.630%  08/18/2008      350,000,000      350,000,000
   Royal Bank of Scotland                                   2.690%  09/22/2008      300,000,000      300,003,427
   Societe Generale NY                                      2.750%  10/22/2008      200,000,000      200,000,000
   Societe Generale NY                                      2.850%  09/10/2008      100,000,000      100,000,000
   Svenska Handelsbanken AB                                 2.705%  07/17/2008      100,000,000      100,000,221
   Toronto Dominion Bank                                    2.740%  09/23/2008      200,000,000      200,000,000
   UBS AG Stamford CT                                       2.810%  07/11/2008      100,000,000      100,000,000


                        See Notes to Financial Statements


                                        4



                       STATE STREET MONEY MARKET PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                            JUNE 30, 2008 (UNAUDITED)



                                                         INTEREST    MATURITY       PRINCIPAL        AMORTIZED
NAME OF ISSUER AND TITLE OF ISSUE                          RATE        DATE          AMOUNT            COST+
- ---------------------------------                        --------   ----------   --------------   --------------
                                                                                      
YANKEE CERTIFICATES OF DEPOSIT (CONTINUED)
BANK FOREIGN (CONTINUED)
   UBS AG Stamford CT                                       2.940%  07/03/2008   $  250,000,000   $  250,000,034
                                                                                                  --------------
TOTAL YANKEE CERTIFICATES OF DEPOSIT                                                               3,895,006,993
                                                                                                  --------------
EURO CERTIFICATES OF DEPOSIT - 9.6%
BANK FOREIGN - 9.6%
   Australia New Zealand Cayman                             2.750%  09/16/2008      200,000,000      200,000,000
   Credit Agricole SA                                       2.710%  09/02/2008      250,000,000      250,000,000
   ING Bank Amsterdam                                       2.800%  07/14/2008       75,000,000       75,000,000
   ING Bank Amsterdam                                       2.900%  07/07/2008      300,000,000      300,000,000
                                                                                                  --------------
TOTAL EURO CERTIFICATES OF DEPOSIT                                                                   825,000,000
                                                                                                  --------------
BANK NOTES - 6.1%
BANK DOMESTIC - 3.5%
   Bank of America(b)                                       2.750%  09/15/2008      300,000,000      300,000,000
                                                                                                  --------------
                                                                                                     300,000,000
                                                                                                  --------------
BANK FOREIGN - 2.6%
   BNP Paribas(a)(b)                                        2.719%  08/19/2008       25,000,000       25,000,000
   Lloyds TSB Group PLC(a)(b)                               2.440%  07/07/2008      100,000,000      100,000,000
   Svenska Handelsbanken(a)(b)                              2.471%  07/21/2008      100,000,000      100,000,000
                                                                                                  --------------
                                                                                                     225,000,000
                                                                                                  --------------
TOTAL BANK NOTES                                                                                     525,000,000
                                                                                                  --------------
MASTER NOTE - 1.2%
   Goldman Sachs Group, Inc.(a)(c)                          3.182%  07/21/2008      100,000,000      100,000,000
                                                                                                  --------------
Total MASTER NOTE                                                                                    100,000,000
                                                                                                  --------------
MEDIUM TERM NOTES - 4.8%
BANK DOMESTIC - 2.0%
   American Express Credit Corp.(a)                         2.492%  07/21/2008       20,000,000       20,000,000
   JPMorgan Chase & Co.(a)                                  2.449%  07/02/2008       50,000,000       50,000,000
   Procter & Gamble International Funding SCA(a)            2.789%  08/19/2008       24,000,000       24,000,000
   Wells Fargo Company(a)                                   2.631%  07/18/2008       50,000,000       50,000,000
   Wells Fargo Company(a)                                   2.631%  07/18/2008       30,000,000       30,000,000
                                                                                                  --------------
                                                                                                     174,000,000
                                                                                                  --------------
BANK FOREIGN - 2.8%
   Alliance & Leicester PLC(a)(b)                           2.493%  07/31/2008       35,000,000       35,000,000
   Bank of Scotland PLC(a)(b)                               2.448%  07/09/2008       25,000,000       25,000,000
   Caja de Ahorros y Monte de Piedad de Madrid(a)(b)        2.968%  07/21/2008       30,000,000       30,000,000
   National Australia Bank Ltd.(a)(b)                       2.448%  07/07/2008       20,000,000       20,000,000
   UniCredito Italiano Bank Ireland PLC(a)(b)               2.501%  07/15/2008       15,000,000       15,000,000


                        See Notes to Financial Statements


                                        5



                       STATE STREET MONEY MARKET PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                            JUNE 30, 2008 (UNAUDITED)



                                                            INTEREST    MATURITY       PRINCIPAL        AMORTIZED
NAME OF ISSUER AND TITLE OF ISSUE                             RATE        DATE          AMOUNT            COST+
- ---------------------------------                           --------   ----------   --------------   --------------
                                                                                         
MEDIUM TERM NOTES (CONTINUED)
BANK FOREIGN (CONTINUED)
Westpac Banking Corp.(a)(b)                                    2.440%  07/07/2008   $  100,000,000   $  100,000,000
Westpac Banking Corp.(a)(b)                                    2.471%  07/16/2008       15,000,000       15,000,000
                                                                                                     --------------
                                                                                                        240,000,000
                                                                                                     --------------
TOTAL MEDIUM TERM NOTES                                                                                 414,000,000
                                                                                                     --------------
PROMISSORY NOTE - 0.6%
   Goldman Sachs Group, Inc.(a)(c)                             4.100%  07/15/2008       50,000,000       50,000,000
                                                                                                     --------------
Total PROMISSORY NOTE                                                                                    50,000,000
                                                                                                     --------------
REPURCHASE AGREEMENTS - 19.7%
   Bank of America Tri Party Repo, dated 06/30/08
      (collateralized by Federal Home Loan Mortgage
      Corporation, 0.000% due 12/05/08 valued at
      $16,039,958); proceeds $15,726,005                       2.300%  07/01/2008       15,725,000       15,725,000
   Bank of America Tri Party Repo, dated 06/30/08
      (collateralized by Federal National Mortgage
      Associations, 5.500% due 06/01/33 valued at
      $408,000,000); proceeds $400,027,778                     2.500%  07/01/2008      400,000,000      400,000,000
   Credit Suisse First Boston Tri Party Repo, dated
      06/30/08 (collateralized by Corporate Notes, 5.250%
      - 8.812% due 05/15/09 - 05/23/37 valued at
      $78,520,429); proceeds $75,005,521                       2.650%  07/01/2008       75,000,000       75,000,000
   JP Morgan Chase Tri Party Repo, dated 06/30/08
      (collateralized by Government National Mortgage
      Association, 4.500% - 6.000% due 07/20/31 -
      11/20/35, Federal National Mortgage Association,
      2.983% - 7.000% due 07/01/16 - 05/01/38, and
      Federal Home Loan Mortgage Corporation 3.021% -
      22.120% due 11/01/10 - 04/01/38 valued at
      $408,000,000); proceeds $400,030,000                     2.700%  07/01/2008      400,000,000      400,000,000
   Salomon Brothers Tri Party Repo, dated 06/30/08
      (collateralized by Federal National Mortgage
      Association, 6.000% due 11/01/36 -10/01/37 valued
      at $408,003,280); proceeds $400,030,000                  2.700%  07/01/2008      400,000,000      400,000,000
   UBS Warburg Tri Party Repo, dated 06/30/08
      (collateralized by Federal National Mortgage
      Association, 3.500% - 12.500% due 07/01/08 -
      06/01/48 valued at $408,004,734);
      proceeds $400,030,556                                    2.750%  07/01/2008      400,000,000      400,000,000
                                                                                                     --------------
TOTAL REPURCHASE AGREEMENTS                                                                           1,690,725,000
                                                                                                     --------------
TOTAL INVESTMENTS(d) - 99.7%                                                                          8,555,940,904
OTHER ASSETS IN EXCESS OF LIABILITIES - 0.3%                                                             26,863,984
                                                                                                     --------------
NET ASSETS - 100.0%                                                                                  $8,582,804,888
                                                                                                     ==============


- ----------
(a)  Floating Rate Note- Interest rate shown is rate in effect at June 30, 2008
     with next reset date.

                        See Notes to Financial Statements


                                        6



                       STATE STREET MONEY MARKET PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                            JUNE 30, 2008 (UNAUDITED)

(b)  Security subject to restrictions on resale under federal securities laws,
     which may only be resold upon registration under the Securities Act of
     1933, as amended ("1933 Act") or in transactions exempt from registration,
     including sales to qualified institutional buyers pursuant to Rule 144A of
     the 1933 Act. The Portfolio does not have the right to demand that this
     security be registered.

(c)  Security subject to restrictions on resale that has been deemed by the
     Adviser to be illiquid. The Portfolio may not invest more than 10% of its
     net assets in illiquid securities. At June 30, 2008, this security
     represents 1.7% of net assets.

(d)  Also represents the cost for federal tax purposes.

+    See Note 2 to the Notes to Financial Statements.

                        See Notes to Financial Statements


                                        7



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
PORTFOLIO STATISTICS (UNAUDITED)



PORTFOLIO COMPOSITION*                         JUNE 30, 2008
- ----------------------                         -------------
                                            
Health                                              22.3%
Education                                           21.7
General Obligations                                 17.2
Pre Refunded/Escrow to Maturity                      6.0
Transportation                                       5.6
Utility                                              5.3
Electric Power                                       4.8
Housing Revenue                                      3.5
Industrial Revenue/Pollution Control Revenue         3.5
Portfolio Revenue                                    2.0
Public Agency                                        2.0
Airport                                              1.8
Water Revenue                                        1.6
Water & Sewer                                        1.5
Other Revenue                                        1.0
Municipals                                           0.2
                                                   -----
Total                                              100.0%
                                                   =====




MATURITY LADDER                                JUNE 30, 2008
- ---------------                                -------------
                                            
0-3 Days                                            77.3%
4-90 Days                                            1.3%
90+ Days                                            21.4
                                                   -----
Total                                              100.0%
                                                   =====
Average maturity                                 39 Days


*    The Portfolio's composition will vary over time.

                        See Notes to Financial Statements


                                        8



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)



                                                                                DATE
                                                         PRINCIPAL    RATE       OF           VALUE
                                                          AMOUNT        %     MATURITY          $
                                                       ------------   ----   ----------   ------------
                                                                              
SHORT-TERM TAX-EXEMPT OBLIGATIONS - 93.3%
ALABAMA - 1.7%
Lower Alabama Gas District Supply Revenue
   Bonds, Series A, LIQ: Societe Generale(a)              3,800,000   1.40   07/03/2008      3,800,000
Montgomery Alabama Waterworks & Sanitary
   Sewer Board Revenue Bonds, Series 881, INS:
   FSA, LIQ: JP Morgan Chase Bank(a)                      5,230,000   1.63   07/03/2008      5,230,000
                                                                                          ------------
                                                                                             9,030,000
                                                                                          ------------
ARIZONA - 3.3%
Austin Trust Various States Revenue Bonds,
   Series 2008-1151, LIQ: Bank of America N.A.(a)         8,990,000   1.60   07/03/2008      8,990,000
City of Scottsdale Arizona, GO Unlimited(b)               3,000,000   5.50   07/01/2009      3,118,043
Salt Verde Financial Corporation Gas Revenue
   Bonds, PUTTERS, Series 2267, LIQ: JP Morgan
   Chase Bank(a)                                          5,200,000   1.60   07/03/2008      5,200,000
                                                                                          ------------
                                                                                            17,308,043
                                                                                          ------------
CALIFORNIA - 0.8%
California School Cash Reserve Program
   Authority, COPs, Series A, LOC: Bank NA                2,000,000   3.00   07/06/2009      2,027,020
Metropolitan Water District of Southern California
   Waterworks Revenue Bonds, Series A, SPA:
   Landesbank Baden-Wuerttemberg(a)                       2,165,000   1.28   07/03/2008      2,165,000
                                                                                          ------------
                                                                                             4,192,020
                                                                                          ------------
COLORADO - 5.9%
City of Colorado Springs Colorado Utilities
   Revenue Bonds, Sub Lien Improvement,
   Series A, SPA: Dexia Credit Local(a)                  18,500,000   1.50   07/03/2008     18,500,000
City of Colorado Springs Colorado Utilities
   Revenue Bonds, Sub Lien, Series A, SPA: Dexia
   Credit Local(a)                                        3,925,000   1.50   07/03/2008      3,925,000
Southern Ute Indian Tribe of Southern Ute Indian
   Reservation Revenue Bonds(a)                           8,200,000   1.55   07/03/2008      8,200,000
                                                                                          ------------
                                                                                            30,625,000
                                                                                          ------------
CONNECTICUT - 4.0%
Connecticut State HEFA Revenue Bonds, Yale
   University, Series U2(a)                              10,500,000   1.27   07/02/2008     10,500,000
State of Connecticut, GO Unlimited, Series A             10,000,000   2.25   04/15/2009     10,047,476
                                                                                          ------------
                                                                                            20,547,476
                                                                                          ------------


                        See Notes to Financial Statements


                                        9



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)



                                                                                DATE
                                                         PRINCIPAL    RATE       OF           VALUE
                                                          AMOUNT        %     MATURITY          $
                                                       ------------   ----   ----------   ------------
                                                                              
DELAWARE - 0.3%
Delaware State EDA, Hospital Billing, Series A,
   LOC: JP Morgan Chase Bank(a)                           1,500,000   1.62   07/02/2008      1,500,000
                                                                                          ------------
DISTRICT OF COLUMBIA - 1.8%
District of Columbia Revenue Bonds, ROCs RR II
   R-11247, INS: BHAC-CR MBIA, LIQ: Citibank
   N.A.(a)                                                9,500,000   1.58   07/03/2008      9,500,000
                                                                                          ------------
FLORIDA - 3.6%
Austin Trust Various States, COPs,
   Series 2007-138, INS: Assured Guaranty
   AMBAC, LIQ: Bank of America N.A.(a)                    9,900,000   1.60   07/03/2008      9,900,000
Jacksonville Florida Health Facilities Authority
   Hospital Revenue Bonds, Baptist Medical -
   RNKT, LOC: Bank of America N.A.(a)                     3,500,000   2.50   07/01/2008      3,500,000
Orlando Florida Utilities Commission Water &
   Electric Revenue Bonds, Series B, SPA: Suntrust
   Bank(a)                                                5,400,000   1.52   07/02/2008      5,400,000
                                                                                          ------------
                                                                                            18,800,000
                                                                                          ------------
GEORGIA - 6.0%
Hall County Gainesville Georgia Hospital
   Authority Revenue Bonds, ANTIC Certificates,
   Northeast Health, Series B, INS: MBIA, SPA:
   Landesbank Baden-Wuerttemberg(a)                      10,000,000   8.75   07/02/2008     10,000,000
Municipal Electric Authority Georgia, Gen C
   Rmkt, INS: GO of Participants, LOC:
   Bayerische Landesbank(a)                               1,500,000   1.50   07/02/2008      1,500,000
Municipal Electric Authority of Georgia Revenue
   Bonds, PJ One SUB D RMKT, INS: FSA, SPA:
   Dexia Credit Local(a)                                  7,800,000   1.50   07/02/2008      7,800,000
Roswell Georgia Housing Authority Multifamily
   Revenue Bonds, Chambrel Roswell, INS: Fannie
   Mae, LIQ: Fannie Mae(a)                               11,980,000   1.56   07/03/2008     11,980,000
                                                                                          ------------
                                                                                            31,280,000
                                                                                          ------------
ILLINOIS - 6.4%
Chicago Illinois Board of Education, GO
   Unlimited, Series D, INS: FSA, SPA: Dexia
   Credit Local(a)                                        2,000,000   1.50   07/03/2008      2,000,000
Chicago Illinois Board of Education, Series C, GO,
   INS: FSA, SPA: Dexia Public Finance(a)                 1,950,000   1.53   07/03/2008      1,950,000


                        See Notes to Financial Statements


                                       10



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)



                                                                                DATE
                                                         PRINCIPAL    RATE       OF           VALUE
                                                          AMOUNT        %     MATURITY          $
                                                       ------------   ----   ----------   ------------
                                                                              
ILLINOIS (CONTINUED)
City of Chicago Illinois, Neighborhoods Alive 21,
   Class B, INS: MBIA, SPA: Depfa Bank PLC(a)             5,000,000   7.65   07/03/2008      5,000,000
Illinois Development Finance Authority Revenue
   Bonds, Chicago Educational TV Assignment,
   Series A, LOC: Lasalle Bank N.A.(a)                    1,900,000   1.80   07/02/2008      1,900,000
Illinois Development Finance Authority Revenue
   Bonds, Chicago Symphony PJ, INS: GO of
   Corp, LOC: Bank One N.A.(a)                            8,500,000   1.55   07/02/2008      8,500,000
Illinois Development Finance Authority Revenue
   Bonds, Evanston Northwestern, Class C, SPA:
   Bank One N.A.(a)                                         830,000   1.55   07/03/2008        830,000
Illinois Development Finance Authority Revenue
   Bonds, World Communications, Inc., LOC:
   Lasalle Bank N.A.(a)                                   1,500,000   1.55   07/02/2008      1,500,000
Illinois Finance Authority Revenue Bonds,
   Northwestern University, Series B(a)                   9,800,000   1.42   07/02/2008      9,800,000
Lake County Illinois Community Consolidated
   School District No 50-Woodland, Series A, GO
   Unlimited, INS: FGIC(b)                                1,760,000   6.00   12/01/2008      1,807,608
                                                                                          ------------
                                                                                            33,287,608
                                                                                          ------------
INDIANA - 1.6%
Delaware County Hospital Authority Revenue
   Bonds, Cardinal Health Systems Obligation,
   INS: AMBAC, LIQ: FAC-Bank One Indiana(a)               4,200,000   7.75   07/02/2008      4,200,000
Indiana State Development Finance Authority
   Revenue Bonds, Educational Facilities, Indiana
   Historical Society, LOC: Bank One Indiana
   N.A.(a)                                                4,200,000   1.55   07/02/2008      4,200,000
                                                                                          ------------
                                                                                             8,400,000
                                                                                          ------------
LOUISIANA - 2.6%
City of New Orleans Louisiana, ROCs RR II,
   Series R-12151, GO Unlimited, INS: AGC-ICC-
   FGIC, LIQ: Citibank N.A.(a)                           11,880,000   1.57   07/03/2008     11,880,000
Louisiana State Offshore Terminal Authority Deep
   Water Port Revenue Bond, Series B, LOC: Bank
   One N.A.(a)                                            1,500,000   1.55   07/02/2008      1,500,000
                                                                                          ------------
                                                                                            13,380,000
                                                                                          ------------


                        See Notes to Financial Statements


                                       11



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)



                                                                                DATE
                                                         PRINCIPAL    RATE       OF           VALUE
                                                          AMOUNT        %     MATURITY          $
                                                       ------------   ----   ----------   ------------
                                                                              
MAINE - 1.2%
State of Maine, GO Unlimited                              6,000,000   4.00   05/15/2009      6,119,698
                                                                                          ------------
MARYLAND - 1.7%
Maryland State Economic Development
   Corporation Revenue Bonds, Howard Hughes
   Medical Institution, Series B(a)                       3,000,000   1.30   07/02/2008      3,000,000
Maryland State Health & Higher Educational
   Facilities Authority Revenue Bonds, University
   of Maryland Medical System, Class A, LOC:
   Wachovia Bank N.A.(a)                                  6,000,000   1.47   07/03/2008      6,000,000
                                                                                          ------------
                                                                                             9,000,000
                                                                                          ------------
MASSACHUSETTS - 14.3%
Austin Trust Various States Revenue Bonds,
   Series 2007-1040, INS: FSA, LIQ: Bank of
   America N.A.(a)                                        5,000,000   1.57   07/03/2008      5,000,000
Commonwealth of Massachusetts, GO Unlimited,
   Series C, INS: AMBAC, SPA: Bank of America
   N. A.(a)                                               7,900,000   1.90   07/03/2008      7,900,000
Massachusetts Bay Transportation Authority
   Revenue Bonds, Series A, INS: FGIC(b)                 14,520,000   5.88   03/01/2009     15,063,950
Massachusetts State HEFA Revenue Bonds, Havard
   University, Series GG-1(a)                             2,700,000   1.18   07/03/2008      2,700,000
Massachusetts State HEFA Revenue Bonds,
   Museum of Fine Arts, Series A1, SPA: Bank of
   America N.A.(a)                                       23,000,000   2.45   07/01/2008     23,000,000
Massachusetts State HEFA Revenue Bonds, Partner
   Healthcare System, Series D-3, INS: GO of
   Institution, SPA: JP Morgan Chase Bank(a)             18,545,000   1.46   07/03/2008     18,545,000
Massachusetts State Water Resources Authority
   Revenue Bonds, Series A, INS: FSA(b)                   2,400,000   4.75   08/01/2008      2,429,137
                                                                                          ------------
                                                                                            74,638,087
                                                                                          ------------
MICHIGAN - 1.8%
Michigan State Building Authority Revenue
   Bonds, ROCs RR-II-R-717PB, INS: FSA, LIQ:
   PB Capital Corporation(a)                              9,430,000   1.60   07/03/2008      9,430,000
                                                                                          ------------
MINNESOTA - 1.6%
County of Washington Minnesota, Series A, GO
   Unlimited                                              1,080,000   5.00   02/01/2009      1,098,726


                        See Notes to Financial Statements


                                       12



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)



                                                                                DATE
                                                         PRINCIPAL    RATE       OF           VALUE
                                                          AMOUNT        %     MATURITY          $
                                                       ------------   ----   ----------   ------------
                                                                              
MINNESOTA (CONTINUED)
Southern Minnesota Municipal Power Agency
   Power Supply Systems Revenue Bonds, ROCs
   RR II, Series R-10021Z, INS: MBIA, LIQ:
   FAC- Citigroup Financial(a)                            4,800,000   2.62   07/03/2008      4,800,000
State of Minnesota, GO                                    2,490,000   5.00   08/01/2008      2,493,263
                                                                                          ------------
                                                                                             8,391,989
                                                                                          ------------
MISSOURI - 1.6%
Kansas City Industrial Development Authority
   Revenue Bonds, Oak Street West Student, LOC:
   Bank of America(a)                                     8,550,000   1.54   07/02/2008      8,550,000
                                                                                          ------------
NEW JERSEY - 0.3%
Essex County New Jersey Improvement Authority
   Revenue Bonds, Pooled Governmental Loan
   Program, LOC: First Union National Bank(a)             1,700,000   1.50   07/02/2008      1,700,000
                                                                                          ------------
NEW YORK - 1.7%
City of New York New York, Subseries J2-RMKT,
   LOC: Westdeutsche Landesbank(a)                        7,800,000   1.48   07/02/2008      7,800,000
New York State Local Government Assistance
   Corporation Revenue Bonds, Sub Lien,
   Series A-2, INS: GO of Corporation                     1,250,000   5.00   04/01/2009      1,280,045
                                                                                          ------------
                                                                                             9,080,045
                                                                                          ------------
NORTH CAROLINA - 1.0%
Charlotte North Carolina COPs, Governmental
   Facilities, Series F, SPA: Bank of America
   N.A.(a)                                                2,000,000   1.55   07/03/2008      2,000,000
City of Winston-Salem North Carolina Water and
   Sewer Systems Revenue Bonds, Series C, SPA:
   Dexia Credit Local(a)                                  1,970,000   1.55   07/02/2008      1,970,000
Mecklenburg County North Carolina, GO
   Unlimited, Series C                                      950,000   5.00   02/01/2009        968,071
                                                                                          ------------
                                                                                             4,938,071
                                                                                          ------------
OHIO - 4.0%
Allen County Ohio Hospital Facilities Revenue
   Bonds, Catholic Healthcare Partners, Series C,
   LOC: Wachovia Bank N. A.(a)                            2,680,000   1.70   07/01/2008      2,680,000


                        See Notes to Financial Statements


                                       13



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)



                                                                                DATE
                                                         PRINCIPAL    RATE       OF           VALUE
                                                          AMOUNT        %     MATURITY          $
                                                       ------------   ----   ----------   ------------
                                                                              
OHIO (CONTINUED)
Butler County Ohio Healthcare Facilities Revenue
   Bonds, IMPT-Lifesphere Project, LOC: U.S.
   Bank NA(a)                                             1,400,000   1.48   07/03/2008      1,400,000
Cleveland Cuyahoga County Ohio Port Authority
   Revenue Bonds, Euclid/93rd Garage Office,
   LOC: Fifth Third Bank(a)                                 995,000   1.51   07/02/2008        995,000
Cuyahoga County Ohio Revenue Bonds, Cleveland
   Clinic, Subseries B1, SPA: JP Morgan Chase
   Bank(a)                                               11,200,000   1.70   07/01/2008     11,200,000
Ohio State Higher Educational Facility
   Commission Revenue Bonds, University
   Hospitals Health System, Series C, LOC: Wells
   Fargo Bank N.A.(a)                                     1,000,000   1.43   07/02/2008      1,000,000
Ohio State University General Receipts, Series B(a)       3,500,000   1.37   07/02/2008      3,500,000
                                                                                          ------------
                                                                                            20,775,000
                                                                                          ------------
OREGON - 0.3%
Oregon State, Series 73 G, SPA: JP Morgan Chase
   Bank(a)                                                1,500,000   1.40   07/02/2008      1,500,000
                                                                                          ------------
PENNSYLVANIA - 5.3%
Adams County Pennsylvania Industrial
   Development Authority Revenue Bonds,
   Wellspan Properties INC, INS: AMBAC, SPA:
   Dexia Credit Local(a)(c)                               9,555,000   8.25   07/03/2008      9,555,000
City of Philadelphia Pennsylvania Gas Works
   Revenue Bonds, Series B, INS: FSA(b)                   1,000,000   5.00   07/01/2008      1,011,193
City of Philadelphia Pennsylvania Gas Works
   Revenue Bonds, Sixth Series, INS: FSA(a)               2,000,000   1.50   07/03/2008      2,000,000
Erie Pennsylvania Water Authority Revenue
   Bonds, Series A, INS: FSA, SPA: JP Morgan
   Chase Bank(a)                                          1,000,000   1.50   07/03/2008      1,000,000
Geisinger Authority Pennsylvania Health System
   Revenue Bonds, Series C, SPA: PNC Bank
   N.A.(a)                                                8,500,000   1.65   07/01/2008      8,500,000
Pennsylvania State Turnpike Commission Turnpike
   Revenue Bonds, Series A-2, SPA: Landesbank
   Baden-Wuerttemberg(a)                                  1,400,000   1.55   07/02/2008      1,400,000
Washington County Pennsylvania Authority
   Revenue Bonds, University of Pennsylvania(a)           4,000,000   1.35   07/03/2008      4,000,000
                                                                                          ------------
                                                                                            27,466,193
                                                                                          ------------


                        See Notes to Financial Statements


                                       14



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)



                                                                                DATE
                                                         PRINCIPAL    RATE       OF           VALUE
                                                          AMOUNT        %     MATURITY          $
                                                       ------------   ----   ----------   ------------
                                                                              
PUERTO RICO - 0.6%
Puerto Rico Highway & Transportation Authority
   Revenue Bonds, Series H, INS: AMBAC, SPA:
   Bank of America N. A.(a)                               3,000,000   4.00   07/03/2008      3,000,000
                                                                                          ------------
SOUTH CAROLINA - 3.3%
Greenville County South Carolina School District
   Installment Revenue Bonds, Stars 2007-048,
   LIQ: BNP Paribas(a)                                    7,375,000   1.53   07/03/2008      7,375,000
South Carolina Transportation Infrastructure Bank
   Revenue Bonds, Series 1283, INS: AMBAC,
   LIQ: JP Morgan Chase Bank(a)                           9,525,000   1.63   07/03/2008      9,525,000
                                                                                          ------------
                                                                                            16,900,000
                                                                                          ------------
TENNESSEE - 1.0%
Shelby County Tennessee Health Educational &
   Housing Facilities Board Hospital Revenue
   Bonds, PUTTERs, Series 254, LIQ: JP Morgan
   Chase Bank(a)                                          4,995,000   1.60   07/03/2008      4,995,000
                                                                                          ------------
TEXAS - 9.1%
ABN AMRO Munitops Certificate Trust Revenue
   Bonds, Series 2006-6, INS: AMBAC, SPA: Bank
   of America N. A.(a)(c)                                10,015,000   3.05   07/03/2008     10,015,000
Austin County Texas Industrial Development Corp
   Revenue Bonds, Justin Industries, Inc. Project,
   LOC: Bank One N.A.(a)                                  3,500,000   1.58   07/02/2008      3,500,000
City of Arlington Texas Special Obligations
   Revenue Bonds, Tax-Dallas Cowboys, Class B,
   INS: MBIA, SPA: Depfa Bank PLC(a)                      1,400,000   7.75   07/03/2008      1,400,000
City of Garland Texas, GO Limited(b)                      5,000,000   5.75   02/15/2009      5,140,441
Denton Texas Independent School District, School
   Building, Series B, INS: PSF-GTD, SPA: Bank
   of America N.A.(a)                                     1,000,000   1.55   07/03/2008      1,000,000
Harris County Texas, GO                                   2,215,000   5.00   10/01/2008      2,223,453
State of Texas, Public Finance Authority, Series B,
   GO                                                     1,040,000   4.00   10/01/2008      1,042,035
Texas A&M University Revenue Bonds, Fing
   Systems(b)                                             4,000,000   5.38   05/15/2009      4,135,905
Texas State Transportation Commission Revenue
   Bonds, First Tier                                     13,000,000   5.00   04/01/2009     13,319,341
University of Texas Permanent University
   Fund Revenue Bonds, INS: PUFG(b)                       1,000,000   5.25   07/01/2008      1,012,394


                        See Notes to Financial Statements


                                       15



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)



                                                                                DATE
                                                         PRINCIPAL    RATE       OF           VALUE
                                                          AMOUNT        %     MATURITY          $
                                                       ------------   ----   ----------   ------------
                                                                              
TEXAS (CONTINUED)
University of Texas, University Revenue Bonds,
   Financing Systems, Series A(a)                         4,500,000   1.25   07/02/2008      4,500,000
                                                                                          ------------
                                                                                            47,288,569
                                                                                          ------------
UTAH - 0.3%
Murray City Utah Hospital Revenue Bonds, IHC
   Health Services, Inc., Series A, INS: J.P. Morgan
   Securities(a)                                          1,500,000   1.45   07/03/2008      1,500,000
                                                                                          ------------
VIRGINIA - 1.9%
County of Chesterfield Virginia, Public
   Improvements, GO Unlimited                             2,160,000   4.00   01/01/2009      2,184,566
Norfolk Virginia Economic Development Authority
   Revenue Bonds, Bon Secours Heath, Series A,
   INS: MBIA, SPA: Landesbank Baden-
   Wuerttemberg(a)                                        6,600,000   8.75   07/02/2008      6,600,000
Virginia College Building Authority Educational
   Facilities Revenue Bonds, 21st Century College
   and Equipment, Series B                                1,000,000   5.00   02/01/2009      1,018,153
                                                                                          ------------
                                                                                             9,802,719
                                                                                          ------------
WASHINGTON - 2.0%
Port Vancouver Washington Revenue Bonds,
   United Grain Corporation, Series 84A, LOC:
   Bank of America N.A.(a)                                2,000,000   1.55   07/02/2008      2,000,000
Seattle Washington Water Systems Revenue Bonds,
   Series A, LOC: Bayerische Landesbank(a)                  400,000   1.53   07/02/2008        400,000
Washington State Higher Education Facilities
   Authority Revenue Bonds, Whitman College
   Project, SPA: JP Morgan Chase Bank(a)                  8,000,000   1.55   07/03/2008      8,000,000
                                                                                          ------------
                                                                                            10,400,000
                                                                                          ------------
WISCONSIN - 2.3%
University Hospitals & Clinics Authority Revenue
   Bonds, Series B, INS: GO of Authority, LOC:
   U.S. Bank N.A.(a)                                      1,000,000   1.70   07/01/2008      1,000,000
Wisconsin State HEFA Revenue Bonds, Ascension
   Health, Series D                                       6,200,000   1.75   11/15/2008      6,200,000


                        See Notes to Financial Statements


                                       16



STATE STREET TAX FREE MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)




                                                         PRINCIPAL              DATE
                                                          AMOUNT/     RATE       OF           VALUE
                                                          SHARES        %     MATURITY          $
                                                       ------------   ----   ----------   ------------
                                                                              
WISCONSIN (CONTINUED)
Wisconsin State HEFA Revenue Bonds, Gundersen
   Lutheran, Series A, LOC: Wells Fargo Bank
   N.A.(a)                                                5,000,000   1.53   07/03/2008      5,000,000
                                                                                          ------------
                                                                                            12,200,000
                                                                                          ------------
Total Short-Term Tax-Exempt Obligations                                                    485,525,518
                                                                                          ------------
MONEY MARKET FUNDS - 6.6%
Clark County Nevada Money Market Fund                     4,000,000                          4,000,000
Dreyfus Tax Exempt Cash Management Fund                  30,237,280                         30,237,280
                                                                                          ------------
Total Money Market Funds (at net asset value)                                               34,237,280
                                                                                          ------------
TOTAL INVESTMENTS(d) - 99.9%                                                               519,762,798
OTHER ASSETS IN EXCESS OF LIABILITIES - 0.1%                                                   624,277
                                                                                          ------------
NET ASSETS - 100.0%                                                                       $520,387,075
                                                                                          ============


(a)  Floating Rate Note- Interest rate shown is rate in effect at June 30, 2008
     with next reset date.

(b)  Date shown is pre refunded date.

(c)  Security subject to restrictions on resale under federal securities laws,
     which may only be resold upon registration under the 1933 Act or in
     transactions exempt from registration, including sales to qualified
     institutional buyers pursuant to Rule 144A of the 1933 Act. The Portfolio
     does not have the right to demand that this security be registered.

(d)  Also represents the cost for federal tax purposes.



ACRONYM   NAME
- -------   ----
       
AMBAC     American Municipal Bond Assurance Corporation
COPs      Certificates of Participation
EDA       Economic Development Authority
FGIC      Financial Guaranty Insurance Company
FSA       Financial Security Assurance
GO        General Obligation
GTD       Guaranteed
HEFA      Health and Educational Facilities Authority
INS       Insured
LOC       Letter of Credit
MBIA      Municipal Bond Investors Assurance
PSF       Permanent School Fund
PUTTERs   Puttable Tax Exempt Receipts
ROCs      Reset Option Certificates
SPA       Standby Purchase Agreement


                        See Notes to Financial Statements


                                       17


STATE STREET U.S. GOVERNMENT MONEY MARKET PORTFOLIO

PORTFOLIO STATISTICS (UNAUDITED)



PORTFOLIO COMPOSITION*                   JUNE 30, 2008
- -----------------------                  -------------
                                      
U.S. Government Securities                    66.4%
Repurchase Agreements                         33.6
Liabilities less cash and other assets         0.0
                                             -----
Total                                        100.0%
                                             =====




MATURITY LADDER                          JUNE 30, 2008
- ---------------                          -------------
                                      
0-3 Days                                      33.6%
4-90 Days                                     66.4%
90+ Days                                       0.0
                                             -----
Total                                        100.0%
                                             =====
Average maturity                           31 Days


*    As a percentage of net assets as of the date indicated. The Portfolio's
     composition may vary over time.

                        See Notes to Financial Statements


                                       18



               STATE STREET U.S. GOVERNMENT MONEY MARKET PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                            JUNE 30, 2008 (UNAUDITED)



NAME OF ISSUER                                       INTEREST    MATURITY      PRINCIPAL      AMORTIZED
AND TITLE OF ISSUE                                     RATE        DATE         AMOUNT          COST
- ------------------                                  ---------   ----------   ------------   ------------
                                                                                
U.S. GOVERNMENT AGENCY OBLIGATIONS -- 66.4%
Fannie Mae Discount Notes(a)                          2.055%    07/09/2008   $ 79,000,000   $ 78,963,923
Fannie Mae Discount Notes(a)                          2.000%    07/30/2008     80,000,000     79,871,111
Fannie Mae Discount Notes(a)                          2.030%    07/30/2008     20,005,000     19,972,286
Fannie Mae Discount Notes(a)                          2.060%    08/01/2008     45,000,000     44,920,175
Fannie Mae Discount Notes(a)                          2.070%    08/01/2008     25,000,000     24,955,438
Fannie Mae Discount Notes(a)                          2.105%    08/08/2008     23,800,000     23,747,495
Fannie Mae Discount Notes(a)                          2.350%    09/10/2008     70,483,000     70,156,331
Federal Home Loan Bank(b)                             2.664%    09/17/2008     50,000,000     50,011,660
Federal Home Loan Bank(b)                             2.575%    08/07/2008     65,000,000     65,000,000
Federal Home Loan Bank Discount Notes(a)              2.000%    08/01/2008     50,000,000     49,913,889
Federal Home Loan Bank Discount Notes(a)              2.220%    08/27/2008     19,220,000     19,152,442
Federal Home Loan Bank Discount Notes(a)              2.260%    08/29/2008     44,000,000     43,837,029
Federal Home Loan Bank Discount Notes(a)              2.330%    08/29/2008     33,000,000     32,873,986
Federal Home Loan Bank Discount Notes(a)              2.090%    09/03/2008     42,201,000     42,044,200
Freddie Mac(b)                                        2.639%    09/26/2008     70,000,000     70,057,222
Freddie Mac Discount Notes(a)                         2.060%    07/14/2008     40,000,000     39,970,244
Freddie Mac Discount Notes(a)                         2.070%    07/14/2008     61,000,000     60,954,402
Freddie Mac Discount Notes(a)                         2.060%    08/08/2008     31,000,000     30,932,592
Freddie Mac Discount Notes(a)                         2.130%    08/18/2008     92,500,000     92,237,300
Freddie Mac Discount Notes(a)                         2.410%    09/15/2008     30,000,000     29,847,367
Freddie Mac Discount Notes(a)                         2.470%    09/22/2008     16,700,000     16,604,898
                                                                                            ------------
TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS                                                     986,023,990
                                                                                            ------------
REPURCHASE AGREEMENTS - 33.6%
ABN AMRO Inc. Tri Party Repo, dated 06/30/08
   (collateralized by a Federal National Mortgage
   Association, 3.150% due 05/06/10, a Federal
   Home Loan Bank, 5.250% due 05/21/09 and a
   Federal Home Loan Mortgage Corporation,
   0.000% due 07/02/08 valued at $178,500,124);
   proceeds $175,012,639                              2.600%    07/01/2008    175,000,000    175,000,000
Bank of America Tri Party Repo, dated 06/30/08
   (collateralized by a Federal Home Loan Bank,
   1.900% due 03/20/09 valued at $49,866,471);
   proceeds $48,888,123                               2.300%    07/01/2008     48,885,000     48,885,000
Credit Suisse First Boston Tri Party Repo, dated
   06/30/08 (collateralized by a Federal National
   Mortgage Association, 0.000% due 05/01/09 and
   Strip Principals, 0.000% - 6.000% due 08/15/08
   - 05/15/14 valued at $51,002,831); proceeds
   $50,003,472                                        2.500%    07/01/2008     50,000,000     50,000,000
Goldman Sacs Tri Party Repo, dated 06/30/08
   (collateralized by a U.S. Treasury Note,
   7.250% due 08/15/22 valued at
   $178,500,043); proceeds $175,011,667               2.400%    07/01/2008    175,000,000    175,000,000
UBS Warburg Tri Party Repo, dated 06/30/08
   (collateralized by Resolution Funding Strips,
   0.000% due 07/15/12 - 10/15/16 valued at
   $51,002,342); proceeds $50,003,681                 2.650%    07/01/2008     50,000,000     50,000,000
                                                                                            ------------


                        See Notes to Financial Statements


                                       19



               STATE STREET U.S. GOVERNMENT MONEY MARKET PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                            JUNE 30, 2008 (UNAUDITED)



NAME OF ISSUER                                  INTEREST   MATURITY   PRINCIPAL      AMORTIZED
AND TITLE OF ISSUE                                RATE       DATE       AMOUNT          COST
- ------------------                              --------   --------   ---------   --------------
                                                                      
TOTAL REPURCHASE AGREEMENTS                                                          498,885,000
                                                                                  --------------
TOTAL INVESTMENTS(C) - 100.0%                                                      1,484,908,990
OTHER ASSETS IN EXCESS OF LIABILITIES - 0.00%                                            175,386
                                                                                  --------------
NET ASSETS - 100.0%                                                               $1,485,084,376
                                                                                  ==============


(a)  Discount rate at time of purchase.

(b)  Variable Rate Security - Interest Rate is in effect as of June 30, 2008
     with next reset date.

(c)  Also represents the cost for federal tax purposes.

                        See Notes to Financial Statements


                                       20



STATE STREET TREASURY MONEY MARKET PORTFOLIO

PORTFOLIO STATISTICS (UNAUDITED)



PORTFOLIO COMPOSITION*                   JUNE 30, 2008
- ----------------------                   -------------
                                      
U.S. Treasury Obligations                    100.0%
Liabilities less cash and other assets         0.0
                                             -----
Total                                        100.0%
                                             =====




MATURITY LADDER                          JUNE 30, 2008
- ---------------                          -------------
                                      
0-3 Days                                      13.0%
4-90 Days                                     87.0%
90+ Days                                       0.0
                                             -----
Total                                        100.0%
                                             =====
Average maturity                             26 Days


*    As a percentage of net assets as of the date indicated. The Portfolio's
     composition may vary over time.


                                       21


                         STATE STREET TREASURY PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                            JUNE 30, 2008 (UNAUDITED)



                                              INTEREST    MATURITY     PRINCIPAL      AMORTIZED
NAME OF ISSUER AND TITLE OF ISSUE               RATE        DATE         AMOUNT         COST
- ---------------------------------             --------   ----------   -----------   ------------
                                                                        
U.S. TREASURY OBLIGATIONS - 100.0%
   United States Treasury Bill                 1.735%    07/03/2008   $25,103,000   $ 25,100,580
   United States Treasury Bill                 1.760%    07/03/2008    60,000,000     59,994,133
   United States Treasury Bill                 1.860%    07/03/2008    31,242,000     31,238,772
   United States Treasury Bill                 1.550%    07/10/2008    30,205,000     30,193,295
   United States Treasury Bill                 1.685%    07/10/2008    25,000,000     24,989,469
   United States Treasury Bill                 1.880%    07/10/2008    50,000,000     49,976,500
   United States Treasury Bill                 1.880%    07/10/2008    50,000,000     49,983,688
   United States Treasury Bill                 1.895%    07/10/2008    25,000,000     24,988,156
   United States Treasury Bill                 1.445%    07/17/2008    15,095,000     15,085,473
   United States Treasury Bill                 1.220%    07/17/2008    34,129,000     34,110,495
   United States Treasury Bill                 1.710%    07/17/2008    45,000,000     44,965,800
   United States Treasury Bill                 1.720%    07/17/2008    75,000,000     74,942,667
   United States Treasury Bill                 1.820%    07/17/2008    25,000,000     24,979,778
   United States Treasury Bill                 1.700%    07/24/2008    30,000,000     29,967,417
   United States Treasury Bill                 1.730%    07/24/2008    25,000,000     24,972,368
   United States Treasury Bill                 1.740%    07/24/2008    16,555,000     16,536,596
   United States Treasury Bill                 1.770%    07/24/2008    30,000,000     29,966,075
   United States Treasury Bill                 1.810%    07/24/2008    25,000,000     24,971,090
   United States Treasury Bill                 1.848%    08/07/2008    25,000,000     24,954,264
   United States Treasury Bill                 1.720%    08/07/2008    20,000,000     19,964,644
   United States Treasury Bill                 1.762%    08/14/2008    20,000,000     19,956,538
   United States Treasury Bill                 1.600%    08/21/2008    25,000,000     24,943,333
   United States Treasury Bill                 1.640%    08/28/2008    25,000,000     24,933,944
   United States Treasury Bill                 1.660%    09/04/2008    20,000,000     19,940,056
   United States Treasury Bill                 1.815%    09/04/2008    15,000,000     14,950,844
   United States Treasury Bill                 1.736%    09/18/2008    16,490,000     16,428,302
   United States Treasury Bill                 1.750%    09/18/2008    20,000,000     19,923,194
   United States Treasury Bill                 1.720%    09/25/2008    20,000,000     19,917,822
   United States Treasury Bill- When Issued    1.840%    07/31/2008    25,000,000     24,962,865
   United States Treasury Bill- When Issued    1.700%    07/31/2008    20,000,000     19,971,667
   United States Treasury Bill- When Issued    1.805%    07/31/2008    25,000,000     24,962,396
                                                                                    ------------
TOTAL U.S. TREASURY OBLIGATIONS                                                      892,772,221
                                                                                    ------------
TOTAL INVESTMENTS(a) - 100.0%                                                        892,772,221
LIABILITIES IN EXCESS OF ASSETS - 0.00%                                                 (143,974)
                                                                                    ------------
NET ASSETS - 100.0%                                                                 $892,628,247
                                                                                    ============


(a)  Also represents the cost for federal tax purposes.

                        See Notes to Financial Statements


                                       22



STATE STREET TREASURY PLUS MONEY MARKET PORTFOLIO

PORTFOLIO STATISTICS (UNAUDITED)



                                         JUNE 30,
PORTFOLIO COMPOSITION*                     2008
- ----------------------                   --------
                                      
U.S. Treasury Obligations                  51.9%
U.S. Government Securities                  0.0
Repurchase Agreements                      48.1
Liabilities less cash and other assets      0.0
                                          -----
Total                                     100.0%
                                          =====




                                         JUNE 30,
MATURITY LADDER                            2008
- ---------------                          --------
                                      
0-3 Days                                   63.1%
4-90 Days                                  36.9%
90+ Days                                    0.0
                                          -----
Total                                     100.0%
                                          =====
Average maturity                         7 Days


*    As a percentage of net assets as of the date indicated. The Portfolio's
     composition may vary over time.


                                       23



                      STATE STREET TREASURY PLUS PORTFOLIO
                            PORTFOLIO OF INVESTMENTS
                            JUNE 30, 2008 (UNAUDITED)



                                              INTEREST    MATURITY      PRINCIPAL      AMORTIZED
NAME OF ISSUER AND TITLE OF ISSUE               RATE        DATE         AMOUNT          COST
- ---------------------------------             --------   ----------   ------------   ------------
                                                                         
U.S. TREASURY OBLIGATIONS - 51.9%
   United States Treasury Bill                 1.155%    07/03/2008   $ 75,000,000   $ 74,995,187
   United States Treasury Bill                 1.380%    07/10/2008     55,000,000     54,981,025
   United States Treasury Bill                 1.500%    07/10/2008     20,000,000     19,992,500
   United States Treasury Bill                 1.450%    07/17/2008     75,000,000     74,951,667
   United States Treasury Bill                 1.495%    07/24/2008     35,000,000     34,966,570
                                                                                     ------------
TOTAL U.S. TREASURY OBLIGATIONS                                                       259,886,949
                                                                                     ------------
REPURCHASE AGREEMENTS - 48.1%
   Deutsche Tri Party Repo, dated 06/30/08
      (collateralized by a U.S. Treasury
      Bill, 0.000% due 07/03/08 and a U.S.
      Treasury Strip, 0.000% due 02/15/16
      valued at $102,000,001); proceeds
      $100,004,861                             1.750%    07/01/2008    100,000,000    100,000,000
   Fortis Tri Party Repo, dated 06/30/08
      (collateralized by a U.S. Treasury
      Note, 8.000% due 11/15/20 valued at
      $15,300,074); proceeds $15,000,750       1.800%    07/01/2008     15,000,000     15,000,000
   HSBC Tri Party Repo, dated 06/30/08
      (collateralized by a Resolution
      Funding Strip, 0.000% due 01/15/13
      valued at $15,300,285);
      proceeds $15,000,708                     1.700%    07/01/2008     15,000,000     15,000,000
   ING Tri Party Repo, dated 06/30/08
      (collateralized by a U.S. Treasury
      Bond, 8.000% due 11/15/21 valued at
      $15,302,670); proceeds $15,000,771       1.850%    07/01/2008     15,000,000     15,000,000
   Morgan Stanley Tri Party Repo, dated
      06/30/08 (collateralized by U.S.
      Treasury Notes, 4.250% due 08/15/14 -
      11/15/14 valued at $102,928,203);
      proceeds 95,969,585                      1.720%    07/01/2008     95,965,000     95,965,000
                                                                                     ------------
TOTAL REPURCHASE AGREEMENTS                                                           240,965,000
                                                                                     ------------
TOTAL INVESTMENTS(a) - 100.0%                                                         500,851,949
LIABILITIES IN EXCESS OF ASSETS - 0.00%                                                   (80,221)
                                                                                     ------------
NET ASSETS - 100.0%                                                                  $500,771,728
                                                                                     ============


(a)  Also represents the cost for federal tax purposes.

                        See Notes to Financial Statements


                                       24


                            STATE STREET MASTER FUNDS

                      STATEMENTS OF ASSETS AND LIABILITIES
                            JUNE 30, 2008 (UNAUDITED)



                                                                              U.S.
                                                            TAX FREE       GOVERNMENT     TREASURY MONEY   TREASURY PLUS
                                          MONEY MARKET    MONEY MARKET    MONEY MARKET        MARKET        MONEY MARKET
                                            PORTFOLIO       PORTFOLIO       PORTFOLIO        PORTFOLIO       PORTFOLIO
                                         --------------   ------------   --------------   --------------   -------------
                                                                                            
ASSETS
   Investments in unaffiliated
      issuers, at amortized cost
      (Note 2)                           $6,865,215,904   $519,762,798   $  986,023,990    $892,772,221     $259,886,949
   Repurchase Agreements (cost
      $1,690,725,000, $0,
      $498,885,000, $0 and
      $240,965,000, respectively)
      (Note 2)                            1,690,725,000             --      498,885,000              --      240,965,000
                                         --------------   ------------   --------------    ------------     ------------
                                          8,555,940,904    519,762,798    1,484,908,990     892,772,221      500,851,949
   Cash                                             288             --              279           1,142              282
   Receivables:
      Investments sold                               --        277,762               --              --               --
      Interest receivable                    27,087,888      2,418,473          367,754              --           11,675
      Receivable from adviser (Note 3)          162,265         14,901               --              --               --
      Miscellaneous assets                      512,367            816               --              --               --
      Prepaid expense                            21,052         14,192            9,077           7,183            7,012
                                         --------------   ------------   --------------    ------------     ------------
         Total assets                     8,583,724,764    522,488,942    1,485,286,100     892,780,546      500,870,918
                                         --------------   ------------   --------------    ------------     ------------
LIABILITIES
   Payables:
      Investments purchased                          --      2,027,020               --              --               --
      Management fee (Note 3)                   731,948         40,106          126,944          86,461           42,367
      Administration, custody and
         transfer agent fees (Note 3)           150,737          7,941           27,410          17,881            9,041
      Professional fees                          24,331         24,609           34,083          34,600           34,447
      Trustee's fees (Note 4)                        95             --               --              --               --
      Accrued expenses                           12,765          2,191           13,287          13,357           13,335
                                         --------------   ------------   --------------    ------------     ------------
         Total liabilities                      919,876      2,101,867          201,724         152,299           99,190
                                         --------------   ------------   --------------    ------------     ------------
NET ASSETS                               $8,582,804,888   $520,387,075   $1,485,084,376    $892,628,247     $500,771,728
                                         ==============   ============   ==============    ============     ============


                       See Notes to Financial Statements


                                       25



                            STATE STREET MASTER FUNDS

                            STATEMENTS OF OPERATIONS
                   SIX MONTHS ENDED JUNE 30, 2008 (UNAUDITED)



                                                                              U.S.
                                                            TAX FREE       GOVERNMENT     TREASURY MONEY   TREASURY PLUS
                                          MONEY MARKET    MONEY MARKET    MONEY MARKET        MARKET        MONEY MARKET
                                            PORTFOLIO       PORTFOLIO       PORTFOLIO        PORTFOLIO       PORTFOLIO
                                         --------------   ------------   --------------   --------------   -------------
                                                                                            
INVESTMENT INCOME
   Interest                              $  136,803,834   $  6,472,991   $   21,534,149    $  7,899,752     $  6,096,588
                                         --------------   ------------   --------------    ------------     ------------
EXPENSES
   Management fees (Note 3)                   4,079,283        244,924          765,172         490,851          263,981
   Administration, custody and
      transfer agent fees (Note 3)              831,046         49,572          157,296         100,134           54,137
   Professional fees                             31,042         28,141           35,695          35,755           35,602
   Trustee's fees (Note 4)                       29,091          7,018            6,607           5,309            5,041
   Printing fees                                     78            807            1,510           1,515            1,498
   Other expenses                                21,868          2,769           13,062          12,093           11,975
                                         --------------   ------------   --------------    ------------     ------------
      Total Expenses                          4,992,408        333,231          979,342         645,657          372,234
   Less: Fee waivers/reimbursements by
      investment adviser (Note 3)              (913,126)       (88,307)              --              --               --
                                         --------------   ------------   --------------    ------------     ------------
         Total Net Expenses                   4,079,282        244,924          979,342         645,657          372,234
                                         --------------   ------------   --------------    ------------     ------------
NET INVESTMENT INCOME                    $  132,724,552   $  6,228,067   $   20,554,807    $  7,254,095     $  5,724,354
                                         ==============   ============   ==============    ============     ============
REALIZED GAIN (LOSS)
Net realized gain (loss) on
   investments                                  235,064        (98,854)              --         122,457               --
                                         --------------   ------------   --------------    ------------     ------------
NET INCREASE IN NET ASSETS RESULTING
   FROM OPERATIONS                       $  132,959,616   $  6,129,213   $   20,554,807    $  7,376,552     $  5,724,354
                                         ==============   ============   ==============    ============     ============


                       See Notes to Financial Statements


                                       26



                            STATE STREET MASTER FUNDS

                      STATEMENTS OF CHANGES IN NET ASSETS



                                                                             TAX FREE                    U.S. GOVERNMENT
                                           MONEY MARKET                    MONEY MARKET                    MONEY MARKET
                                            PORTFOLIO                        PORTFOLIO                      PORTFOLIO
                                ---------------------------------  ----------------------------  -------------------------------
                                   SIX MONTHS                        SIX MONTHS                     SIX MONTHS
                                     ENDED          YEAR ENDED         ENDED       PERIOD ENDED       ENDED       PERIOD ENDED
                                 JUNE 30, 2008     DECEMBER 31,    JUNE 30, 2008   DECEMBER 31,   JUNE 30, 2008   DECEMBER 31,
                                  (UNAUDITED)          2007         (UNAUDITED)       2007*        (UNAUDITED)         2007*
                                ---------------  ----------------  -------------  -------------  ---------------  --------------
                                                                                                
INCREASE (DECREASE) IN NET
   ASSETS FROM:
OPERATIONS
   Net investment income        $   132,724,552  $    294,455,764  $   6,228,067  $   4,534,841  $    20,554,807  $   10,808,121
   Net realized gain (loss) on
      investments                       235,064            (6,953)       (98,854)        12,161               --              --
                                ---------------  ----------------  -------------  -------------  ---------------  --------------
      Net increase in net
         assets from
         operations                 132,959,616       294,448,811      6,129,213      4,547,002       20,554,807      10,808,121
                                ---------------  ----------------  -------------  -------------  ---------------  --------------
CAPITAL TRANSACTIONS
   Proceeds from contributions   11,362,497,990    14,082,546,440    951,398,348    743,338,878    2,148,915,493   1,801,532,181
   Fair value of withdrawals     (9,830,915,746)  (13,655,849,339)  (884,818,991)  (300,207,375)  (1,761,180,241)   (735,545,985)
                                ---------------  ----------------  -------------  -------------  ---------------  --------------
      Net increase in net
      assets from capital
      transactions                1,531,582,244       426,697,101     66,579,357    443,131,503      387,735,252   1,065,986,196
                                ---------------  ----------------  -------------  -------------  ---------------  --------------
NET INCREASE IN NET ASSETS        1,664,541,860       721,145,912     72,708,570    447,678,505      408,290,059   1,076,794,317
NET ASSETS
   Beginning of period            6,918,263,028     6,197,117,116    447,678,505             --    1,076,794,317              --
                                ---------------  ----------------  -------------  -------------  ---------------  --------------
   End of period                $ 8,582,804,888  $  6,918,263,028  $ 520,387,075  $ 447,678,505  $ 1,485,084,376  $1,076,794,317
                                ===============  ================  =============  =============  ===============  ==============


*    The portfolios commenced operations on February 7, 2007 and October 17,
     2007, respectively.

                       See Notes to Financial Statements


                                       27



                            STATE STREET MASTER FUNDS

                       STATEMENTS OF CHANGES IN NET ASSETS



                                             TREASURY                         TREASURY PLUS
                                           MONEY MARKET                       MONEY MARKET
                                             PORTFOLIO                          PORTFOLIO
                                 --------------------------------   --------------------------------
                                 SIX MONTHS ENDED    PERIOD ENDED   SIX MONTHS ENDED    PERIOD ENDED
                                   JUNE 30, 2008     DECEMBER 31,       JUNE 30,        DECEMBER 31,
                                    (UNAUDITED)         2007*       2008 (UNAUDITED)       2007*
                                 ----------------   -------------   ----------------   -------------
                                                                           
INCREASE (DECREASE) IN NET
   ASSETS FROM:
OPERATIONS
   Net investment income          $     7,254,095   $   2,370,783     $   5,724,354    $   3,784,290
   Net realized gain on
      investments                         122,457           8,735                --               --
                                  ---------------   -------------     -------------    -------------
      Net increase in net
         assets from operations         7,376,552       2,379,518         5,724,354        3,784,290
                                  ---------------   -------------     -------------    -------------
CAPITAL TRANSACTIONS
   Proceeds from
      contributions                 4,300,698,974     652,230,533       679,708,358      934,443,802
   Fair value of withdrawals       (3,945,551,213)   (124,506,117)     (647,851,027)    (475,038,049)
                                  ---------------   -------------     -------------    -------------
      Net increase in net
         assets from capital
         transactions                 355,147,761     527,724,416        31,857,331      459,405,753
                                  ---------------   -------------     -------------    -------------
NET INCREASE IN NET ASSETS            362,524,313     530,103,934        37,581,685      463,190,043
NET ASSETS
   Beginning of period                530,103,934              --       463,190,043               --
                                  ---------------   -------------     -------------    -------------
   End of period                  $   892,628,247   $ 530,103,934     $ 500,771,728    $ 463,190,043
                                  ===============   =============     =============    =============


*    The portfolio commenced operations on October 25, 2007 and October 24,
     2007, respectively.

                       See Notes to Financial Statements


                                       28



                            STATE STREET MASTER FUNDS

                              FINANCIAL HIGHLIGHTS



                                                  RATIOS TO AVERAGE
                                                     NET ASSETS
                                         ----------------------------------
                                                                                NET ASSETS
                                           GROSS        NET         NET           END OF
                               TOTAL     OPERATING   OPERATING   INVESTMENT       PERIOD
PERIOD ENDED DECEMBER 31,   RETURN (a)    EXPENSES    EXPENSES    INCOME      (000S OMITTED)
- -------------------------   ----------   ---------   ---------   ----------   --------------
                                                               
MONEY MARKET PORTFOLIO
   2008*                       1.66%      0.12%**     0.10%**      3.26%**      $8,582,805
   2007                        5.30%      0.12%       0.10%        5.14%         6,918,263
   2006                        5.09%      0.13%       0.10%        5.08%         6,197,117
   2005                        3.31%      0.14%       0.10%        3.33%         1,639,871
   2004 ***                    0.68%      0.18%**     0.10%**      1.71%**         381,716
TAX FREE MONEY MARKET
   PORTFOLIO
   2008*                       1.24%      0.14%**     0.10%**      2.53%**         520,387
   2007 ***                    3.19%      0.17%**     0.10%**      3.42%**         447,679
U.S. GOVERNMENT MONEY
   MARKET PORTFOLIO
   2008*                       1.38%      0.13%**     0.13%**      2.69%**       1,485,084
   2007 ***                    0.92%      0.14%**     0.14%**      4.39%**       1,076,794
TREASURY PORTFOLIO
   2008*                       0.85%      0.13%**     0.13%**      1.48%**         892,628
   2007 ***                    0.61%      0.19%**     0.19%**      3.21%**         530,104
TREASURY PLUS PORTFOLIO
   2008*                       1.11%      0.14%**     0.14%**      2.16%**         500,772
   2007 ***                    0.75%      0.17%**     0.17%**      3.95%**         463,190


(a)  Results represent past performance and are not indicative of future
     results. Total return for periods of less than one year are not annualized.

*    For the six months ended June 30, 2008 (unaudited).

**   Annualized.

***  The portfolios commenced operations on August 12, 2004, February 7, 2007,
     October 17, 2007, October 25, 2007 and October 24, 2007, respectively.

                       See Notes to Financial Statements


                                       29


STATE STREET MASTER FUNDS
NOTES TO FINANCIAL STATEMENTS
JUNE 30, 2008 (UNAUDITED)

1. ORGANIZATION

The State Street Master Funds (the "Trust") is registered under the Investment
Company Act of 1940, as amended (the "1940 Act"), as an open-end management
investment company, and was organized as a business trust under the laws of The
Commonwealth of Massachusetts on July 27, 1999. The Trust comprises eleven
investment portfolios: the State Street Equity 500 Index Portfolio, the State
Street Equity 400 Index Portfolio, the State Street Equity 2000 Index Portfolio,
the State Street Aggregate Bond Index Portfolio, the State Street Money Market
Portfolio, the State Street Tax Free Money Market Portfolio, the State Street
Limited Duration Bond Portfolio, the State Street Short-Term Tax Exempt Bond
Portfolio (formerly the State Street Tax Free Limited Duration Bond Portfolio),
the State Street U.S. Government Money Market Portfolio, the State Street
Treasury Money Market Portfolio and the State Street Treasury Plus Money Market
Portfolio. At June 30, 2008, only the State Street Equity 500 Index Portfolio,
the State Street Money Market Portfolio, the State Street Tax Free Money Market
Portfolio, the State Street Short-Term Tax Exempt Bond Portfolio (formerly the
State Street Tax Free Limited Duration Bond Portfolio), the State Street U.S.
Government Money Market Portfolio, the State Street Treasury Money Market
Portfolio and the State Street Treasury Plus Money Market Portfolio were in
operation. Information presented in these financial statements pertains only to
the State Street Money Market Portfolio, the State Street Tax Free Money Market
Portfolio, the State Street U.S. Government Money Market Portfolio, the State
Street Treasury Money Market Portfolio and the State Street Treasury Plus Money
Market Portfolio (the "Portfolios"). The Portfolios commenced operations as
follows:



PORTFOLIO NAME                                        COMMENCEMENT DATE
- --------------                                        -----------------
                                                   
State Street Money Market Portfolio                   August 12, 2004.
State Street Tax Free Money Market Portfolio          February 7, 2007
State Street U.S. Government Money Market Portfolio   October 17, 2007
State Street Treasury Money Market Portfolio          October 25, 2007
State Street Treasury Plus Money Market Portfolio     October 24, 2007


The Portfolios are authorized to issue an unlimited number of non-transferable
beneficial interests.


                                       30



STATE STREET MASTER FUNDS
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
JUNE 30, 2008 (UNAUDITED)

The Portfolios' investment objectives are as follows:



PORTFOLIO NAME                   INVESTMENT OBJECTIVE
- --------------                   --------------------
                              
State Street Money Market        To seek to maximize current income, to the
Portfolio                        extent consistent with the preservation of
                                 capital and liquidity by investing in dollar
                                 denominated securities.

State Street Tax Free Money      To seek to maximize current income, exempt from
Market Portfolio                 federal income taxes, to the extent consistent
                                 with the preservation of capital and liquidity.

State Street U.S. Government     To seek to maximize current income, to the
Money Market Portfolio           extent consistent with the preservation of
                                 capital and liquidity by investing in U.S.
                                 government securities with remaining maturities
                                 of one year or less an in repurchase agreements
                                 collateralized by U.S. government securities.

State Street Treasury Money      To seek a high level of current income
Market Portfolio                 consistent with preserving principal and
                                 liquidity.

State Street Treasury Plus       To seek a high level of current income
Money Market Portfolio           consistent with preserving principal and
                                 liquidity by investing in a portfolio made up
                                 principally of U.S. Treasury securities and
                                 repurchase agreements collateralized by such
                                 securities.


2. SIGNIFICANT ACCOUNTING POLICIES

The following is a summary of the significant accounting policies consistently
followed by the Portfolios in the preparation of their financial statements.

SECURITY VALUATION: As permitted under Rule 2a-7 of the 1940 Act and certain
conditions therein, securities of the Portfolios are valued initially at cost
and thereafter assume a constant amortization to maturity of any discount or
premium.

The Portfolios adopted Financial Accounting Standards Board Statement of
Financial Accounting Standards No. 157, Fair Value Measurements ("FAS 157"),
effective for financial statements issued for fiscal years beginning after
November 15, 2007 and interim periods within those fiscal years. In accordance
with FAS 157, fair value is defined as the price that the portfolio would
receive upon selling an investment in a timely transaction to an independent
buyer in the principal or most advantageous market of the investment. Various
inputs are used in determining the value of the Fund's investments. FAS 157
established a three tier hierarchy of inputs to establish a classification of
fair value measurements and disclosure. The three tier hierarchy of inputs is
summarized below:

     -    Level 1 -- quoted prices in active markets for identical securities

     -    Level 2 -- other significant observable inputs (including quoted
          prices for similar securities, interest rates, prepayment speeds,
          credit risk, etc.)

     -    Level 3 -- significant unobservable inputs (including the Fund's own
          assumptions in determining the fair value of investments)


                                       31



STATE STREET MASTER FUNDS
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
JUNE 30, 2008 (UNAUDITED)

The inputs or methodology used for valuing securities are not an indication of
the risk associated with investing in those securities.

The following is a summary of the inputs used, as of June 30, 2008, in valuing
the Fund's assets carried at fair value:



                                                                      INVESTMENTS IN
                                                                        SECURITIES
                            --------------------------------------------------------------------------------------------------
                                                 STATE STREET TAX   STATE STREET U.S.     STATE STREET         STATE STREET
                            STATE STREET MONEY      FREE MONEY       GOVERNMENT MONEY    TREASURY MONEY    TREASURY PLUS MONEY
VALUATION INPUTS             MARKET PORTFOLIO    MARKET PORTFOLIO    MARKET PORTFOLIO   MARKET PORTFOLIO     MARKET PORTFOLIO
- ----------------            ------------------   ----------------   -----------------   ----------------   -------------------
                                                                                            
Level 1 -- Quoted Prices      $           --       $         --       $           --      $         --         $         --
Level 2 -- Other
   Significant Observable
   Inputs                      8,555,940,904        519,762,798        1,484,908,990       892,772,221          500,851,949
Level 3 -- Significant
   Unobservable Inputs                    --                 --                   --                --                   --
                              --------------       ------------       --------------      ------------         ------------
   Total                      $8,555,940,904       $519,762,798       $1,484,908,990      $892,772,221         $500,851,949
                              ==============       ============       ==============      ============         ============


SECURITIES TRANSACTIONS, INVESTMENT INCOME AND EXPENSES: Securities transactions
are recorded on a trade date basis for financial statement purposes. Interest
income is recorded daily on the accrual basis and includes amortization of
premium and accretion of discount on investments. Realized gains and losses from
securities transactions are recorded on the basis of identified cost. Expenses
are accrued daily.

All of the net investment income and realized gains and losses from the security
transactions of the Portfolios are allocated pro rata among the partners in the
Portfolios based on each partner's daily ownership percentage.

FEDERAL INCOME TAXES: The Portfolios are not required to pay federal income
taxes on their net investment income and net capital gains because it is treated
as a partnership for federal income tax purposes. All interest, gains and losses
of the Portfolios are deemed to have been "passed through" to the Portfolios'
partners in proportion to their holdings in the Portfolio, regardless of whether
such items have been distributed by the Portfolio. Each partner is responsible
for tax liability based on its distributive share; therefore, no provision has
been made for federal income taxes.

The Portfolios adopted the provisions of Financial Accounting Standards Board
Interpretation No. 48 (FIN 48), "Accounting for Uncertainty in Income Taxes", on
June 29, 2007. As of and during the six months ended June 30, 2008, the
Portfolios did not have a liability for any unrecognized tax expenses. The
Portfolios recognize interest and penalties, if any, relate to tax liabilities
as income tax expense in the Statement of Operations. As of June 30, 2008, tax
years 2004 (or since inception, for Portfolios formed subsequent to 2004)
through 2007 remain subject to examination by the portfolio's major tax
jurisdictions, which include the United State of America and the Commonwealth of
Massachusetts.

At June 30, 2008, the cost of investments for federal income tax purposes was
the same as the cost for financial reporting purposes.

REPURCHASE AGREEMENTS: A repurchase agreement customarily obligates the seller
at the time it sells securities to a Portfolio to repurchase the securities at a
mutually agreed upon price and time which, in the case of the Portfolios'
transactions, is within seven days. The total amount received by a Portfolio on
repurchase is calculated to exceed the price paid by the Portfolio, reflecting
an agreed-upon market rate of


                                       32



STATE STREET MASTER FUNDS
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
JUNE 30, 2008 (UNAUDITED)

interest for the period of time to the settlement date, and is not necessarily
related to the interest rate on the underlying securities. The underlying
securities are ordinarily United States Government securities, but may consist
of other securities in which a Portfolio is permitted to invest. Repurchase
agreements are fully collateralized at all times. The use of repurchase
agreements involves certain risks. For example, if the seller of securities
under a repurchase agreement defaults on its obligation to repurchase the
underlying securities (as a result of its bankruptcy or otherwise) the Portfolio
will seek to dispose of such securities; this action could involve costs or
delays. In addition, the proceeds of any such disposition may be less than the
amount the Portfolio is owed under the repurchase agreement. A Portfolio may
enter into repurchase agreements maturing within seven days with domestic
dealers, banks and other financial institutions deemed to be creditworthy by
SSgA Funds Management, Inc. ("SSgA FM" or the "Adviser"), a subsidiary of State
Street Corporation and an affiliate of State Street Bank and Trust Company
("State Street").

EXPENSE ALLOCATION: Certain expenses are applicable to multiple Portfolios.
Expenses directly attributable to a Portfolio are charged to that Portfolio.
Expenses of the Trust that are not directly attributed to a Portfolio are
allocated among the Portfolios, on the basis of relative net assets, except
where a more appropriate allocation of expenses to each of the Portfolios can
otherwise be made fairly.

USE OF ESTIMATES: The Portfolios' financial statements are prepared in
accordance with U.S. generally accepted accounting principles that require the
use of management estimates. Actual results could differ from those estimates.

3. RELATED PARTY FEES

The Portfolios have entered into investment advisory agreements with SSgA FM.
The Adviser directs the investments of each Portfolio in accordance with its
investment objective, policies, and limitations. In compensation for the
Adviser's services as investment adviser, the Portfolios pay the Adviser an
annual fee of 0.10% of the respective Portfolio's average daily net assets. The
Adviser has contractually agreed to cap the total operating expenses of the
State Street Money Market Portfolio and the State Street Tax Free Money Market
Portfolio at 0.10% of the respective Portfolio's average daily net assets until
April 30, 2009. For the six months ended June 30, 2008, SSgA FM reimbursed the
Portfolios under this agreement as follows:


                                            
State Street Money Market Portfolio            $913,126
State Street Tax Free Money Market Portfolio   $ 88,307


State Street is the administrator, custodian and transfer agent for the
Portfolios. In compensation for State Street's services as administrator,
custodian and transfer agent, beginning February 1, 2007 the Trust pays State
Street an annual fee, which is accrued daily and payable monthly at the
applicable fee rate described below, of the following annual percentages of the
Trust's average aggregate daily net assets during the month as follows:



                                           Annual percentage of
Asset Levels                        average aggregate daily net assets
- ------------                        ----------------------------------
                                 
First $400 Million                                   0.03%
Thereafter                                           0.02
Minimum annual fee per portfolio:                $150,000



                                       33



STATE STREET MASTER FUNDS
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
JUNE 30, 2008 (UNAUDITED)

4. TRUSTEES' FEES

The Trust pays each trustee who is not an officer or employee of SSgA FM or
State Street $2,500 for each meeting of the Board of Trustees and an additional
$500 for each telephonic meeting attended. The Trust also pays each trustee an
annual retainer of $30,000. Each trustee is reimbursed for out-of-pocket and
travel expenses.

5. INDEMNIFICATIONS

The Trust's organizational documents provide that its officers and trustees are
indemnified against certain liabilities arising out of the performance of their
duties to the Trust. In addition, both in some of its principal service
contracts and in the normal course of its business, the Trust enters into
contracts that provide indemnifications to other parties for certain types of
losses or liabilities. The Trust's maximum exposure under these arrangements in
unknown as this could involve future claims against the Trust. Management does
not expect any significant claims.


                                       34



STATE STREET MASTER FUNDS
JUNE 30, 2008 (UNAUDITED)

GENERAL INFORMATION

PROXY VOTING POLICIES AND PROCEDURES AND RECORD

The Trust has adopted proxy voting procedures relating to portfolio securities
held by the Portfolio. A description of the policies and procedures is available
(i) without charge, upon request, by calling (877) 521-4083 or (ii) on the
website of the Securities Exchange Commission (the "SEC") at www.sec.gov.
Information on how the Fund voted proxies relating to portfolio securities
during the most recent 12-month period ending June 30 is available by August 31
(i) without charge, upon request, by calling (877) 521-4083 or (ii) on the SEC's
website at www.sec.gov.

QUARTERLY PORTFOLIO SCHEDULE

The Trust files its complete schedule of portfolio holdings with the SEC for the
first and third quarters of its fiscal year (as of March and September of each
year) on Form N-Q. The Trust's Forms N-Q are available on the SEC's website at
www.sec.gov. The Trust's Forms N-Q may be reviewed and copied at the SEC's
Public Reference Room in Washington, D.C. and information on the operation of
the Public Reference Room may be obtained by calling 1-800-SEC-0330. The most
recent Form N-Q is available without charge, upon request, by calling (877)
521-4083.


                                       35



TRUSTEES
Michael F. Holland
William L. Boyan
Rina K. Spence
Douglas T. Williams
James E. Ross

INVESTMENT ADVISER
SSgA Funds Management, Inc.
State Street Financial Center
One Lincoln Street
Boston, MA 02111

ADMINISTRATOR, CUSTODIAN AND TRANSFER AGENT
State Street Bank and Trust Company
State Street Financial Center
One Lincoln Street
Boston, MA 02111

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
Ernst & Young LLP
200 Clarendon Street
Boston, MA 02116

LEGAL COUNSEL
Ropes & Gray LLP
One International Place
Boston, MA 02110

This report is for shareholder information. This is not a prospectus intended
for use in the purchase or sale of shares of beneficial interest.

State Street Master Funds
State Street Bank and Trust Company
P.O. Box 5049
Boston, MA 02206


                                       36


               STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO
        (FORMERLY STATE STREET TAX FREE LIMITED DURATION BOND PORTFOLIO)

                               SEMI-ANNUAL REPORT

                                 JUNE 30, 2008

                                  (UNAUDITED)



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

EXPENSE EXAMPLE

As a shareholder of the State Street Short-Term Tax Exempt Bond Portfolio (the
"Portfolio"), you incur ongoing costs, which include costs for portfolio
management and administrative services, among others. This example is intended
to help you understand your ongoing costs (in dollars) of investing in the
Portfolio and to compare these costs with the ongoing costs of investing in
other mutual funds.

The example is based on an investment of $1,000 made at the beginning of the
period shown and held for the entire period from January 1, 2008 to June 30,
2008.

The table below illustrates your Portfolio's costs in two ways:

     -    BASED ON ACTUAL FUND RETURN. This section helps you to estimate the
          actual expenses that you paid over the period. The "Ending Account
          Value" shown is derived from the Portfolio's actual return, and the
          third column shows the dollar amount that would have been paid by an
          investor who started with $1,000 in the Portfolio. You may use the
          information here, together with the amount you invested, to estimate
          the expenses that you paid over the period.

          To do so, simply divide your account value by $1,000 (for example, an
          $8,600 account value divided by $1,000 = 8.6), then multiply the
          result by the number given for the Portfolio under the heading
          "Expenses Paid During Period".

     -    BASED ON HYPOTHETICAL 5% RETURN. This section is intended to help you
          compare your Portfolio's costs with those of other mutual funds. It
          assumes that the Portfolio had a yearly return of 5% before expenses,
          but that the expense ratio is unchanged. In this case- because the
          return used is not the Portfolio's actual return- the results do not
          apply to your investment. The example is useful in making comparisons
          because the Securities and Exchange Commission requires all mutual
          funds to calculate expenses based on a 5% return. You can assess your
          Portfolio's costs by comparing this hypothetical example with the
          hypothetical examples that appear in shareholder reports of other
          funds.

Six Months Ended June 30, 2008



                         BEGINNING          ENDING       EXPENSES PAID
                       ACCOUNT VALUE     ACCOUNT VALUE      DURING
                      JANUARY 1, 2008    JUNE 30, 2008      PERIOD *
                      ---------------   --------------   -------------
                                                
BASED ON ACTUAL
   PORTFOLIO RETURN      $1,000.00         $1,018.90         $0.50
BASED ON
   HYPOTHETICAL (5%
   RETURN BEFORE
   EXPENSES)             $1,000.00         $1,024.37         $0.50


*    The calculations are based on expenses incurred in the most recent fiscal
     period of the Portfolio. The Portfolio's annualized average weighted
     expense ratio as of June 30, 2008 was 0.10%. The dollar amounts shown as
     "Expenses Paid" are equal to the annualized average weighted expense ratio
     multiplied by the average account value over the period, multiplied by the
     number of days in the most recent six-month period, then divided by the
     number of days in the most recent 12-month period.


                                        1



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

PORTFOLIO STATISTICS (UNAUDITED)



PORTFOLIO COMPOSITION*            JUNE 30, 2008
- ----------------------            -------------
                               
General Obligations                   34.5%
General Obligations State             20.8
Miscellaneous Revenue                 14.3
Pre Refunded/Escrow to Maturity       12.1
Lease                                  5.5
Water & Sewer                          3.8
Higher Education                       3.1
Hospital Revenue                       2.8
Water Revenue                          1.9
TRANS Revenue                          1.2
                                     -----
Total                                100.0%
                                     =====




MATURITY LADDER                   JUNE 30, 2008
- ---------------                   -------------
                               
< 6 months                             2.9%
6 months - 1 year                      3.9%
1 year +                              93.2%
                                     -----
Total                                100.0%
                                     =====


*    The Portfolio's composition will vary over time.


                                        2


STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED)



                                                                   PRINCIPAL   RATE     DATE OF
                                                                    AMOUNT       %     MATURITY      VALUE $
                                                                  ----------   ----   ----------   -----------
                                                                                       
TAX-EXEMPT OBLIGATIONS -- 80.9%
ALABAMA -- 0.4%
State of Alabama, Parks System Improvement Corp., Series C, GO
   Unlimited                                                         350,000   5.25   06/01/2009       360,696
                                                                                                   -----------
ARIZONA -- 8.2%
Arizona School District, TAN, Financing Program COPs                 900,000   4.50   07/30/2008       901,998
City of Casa Grande Arizona, GO Unlimited, INS: FSA                1,000,000   3.50   07/01/2010     1,014,260
Maricopa County Arizona School District No 11, Peoria, GO
   Unlimited, INS: FSA                                             2,250,000   3.00   07/01/2010     2,260,417
Maricopa County Arizona School District No 66, Roosevelt
   Elementary, Series A, GO Unlimited, INS: FSA                    2,380,000   4.00   07/01/2010     2,436,882
                                                                                                   -----------
                                                                                                     6,613,557
                                                                                                   -----------
CALIFORNIA -- 3.2%
California State Economic Recovery, Series A, GO Unlimited         1,000,000   5.00   01/01/2011     1,046,250
Golden Empire Schools Financing Authority California Lease
   Revenue Bonds, Kern High School District                        1,500,000   4.00   05/01/2010     1,519,215
                                                                                                   -----------
                                                                                                     2,565,465
                                                                                                   -----------
COLORADO -- 1.4%
Central Platte Valley Metropolitan District, Series A, GO
   Unlimited, LOC: BNP Paribas                                     1,110,000   5.00   12/01/2031     1,136,862
                                                                                                   -----------
DISTRICT OF COLUMBIA -- 2.2%
Washington DC Convention Center Authority Dedicated Tax Revenue
   Bonds, Sr. Lien, INS: AMBAC                                     1,750,000   5.25   10/01/2011     1,781,570
                                                                                                   -----------
GEORGIA -- 3.9%
State of Georgia, Series B, GO Unlimited                           3,000,000   5.00   07/01/2010     3,132,510
                                                                                                   -----------
ILLINOIS -- 3.2%
Chicago Illinois Park District, Personal Property Replacement,
   Series D, GO Unlimited                                          1,000,000   5.00   01/01/2011     1,043,800
State of Illinois, First Series, GO Unlimited, INS: FSA            1,075,000   5.25   05/01/2010     1,122,354
State of Illinois, First Series, GO Unlimited, INS: FSA              400,000   5.25   04/01/2009       410,056
                                                                                                   -----------
                                                                                                     2,576,210
                                                                                                   -----------
MARYLAND -- 4.6%
Baltimore County Maryland, Constrution Public Improvement, GO
   Unlimited                                                       1,170,000   5.25   09/01/2010     1,232,431


                        See Notes to Financial Statements


                                        3



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED) (CONTINUED)



                                                                   PRINCIPAL   RATE     DATE OF
                                                                    AMOUNT       %     MATURITY      VALUE $
                                                                  ----------   ----   ----------   -----------
                                                                                       
MARYLAND -- (CONTINUED)
Washington Suburban Sanitation District Maryland, Sewage
   Disposal, GO Unlimited                                          2,400,000   5.00   06/01/2010     2,503,920
                                                                                                   -----------
                                                                                                     3,736,351
                                                                                                   -----------
MASSACHUSETTS -- 3.0%
Commonwealth of Massachusetts, Series E, GO Limited                1,230,000   5.50   01/01/2010     1,281,032
Massachusetts State HEFA Revenue Bonds, New England Medical
   Center Hospital, Series H, INS: FGIC                            1,160,000   5.00   05/15/2009     1,185,381
                                                                                                   -----------
                                                                                                     2,466,413
                                                                                                   -----------
MICHIGAN -- 1.6%
Grand Rapids Michigan Community College, GO Limited, INS: FSA      1,225,000   5.00   05/01/2009     1,257,034
                                                                                                   -----------
NEVADA -- 5.6%
Clark County Nevada, Bond Bank, GO Limited, INS: FGIC              2,000,000   5.00   06/01/2031     2,102,660
State of Nevada, Capital Improvement and Cultural Affairs,
   Series A, GO Limited                                            1,180,000   5.50   03/01/2017     1,233,666
Truckee Meadows Nevada Water Authority Revenue Bonds, Series A,
   INS: FSA                                                        1,180,000   5.50   07/01/2009     1,222,008
                                                                                                   -----------
                                                                                                     4,558,334
                                                                                                   -----------
NEW JERSEY -- 1.1%
New Jersey EDA Revenue Bonds, School Facilities Construction,
   Series Y                                                          850,000   5.00   09/01/2010       882,750
                                                                                                   -----------
NEW MEXICO -- 1.9%
State of New Mexico Severance Tax Revenue Bonds, Series A-2        1,500,000   3.00   07/01/2010     1,506,645
                                                                                                   -----------
NEW YORK -- 4.8%
City of New York New York, Series F, GO Unlimited                  1,000,000   5.00   08/01/2010     1,040,790
New York City Transitional Finance Authority Aid Revenue
   Bonds, Series S-2, INS: State Aid Withholding                   1,500,000   5.00   01/15/2011     1,567,785
New York State Thruway Authority Service Contract Revenue
   Bonds, Bridge Service Contract                                    750,000   3.00   04/01/2010       752,265
New York State Urban Development Corporation Revenue Bonds,
   State Personal Income Tax, Series Al                              500,000   5.00   12/15/2009       519,140
                                                                                                   -----------
                                                                                                     3,879,980
                                                                                                   -----------
NORTH CAROLINA -- 4.9%


                        See Notes to Financial Statements


                                        4



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED) (CONTINUED)



                                                                   PRINCIPAL   RATE     DATE OF
                                                                    AMOUNT       %     MATURITY      VALUE $
                                                                  ----------   ----   ----------   -----------
                                                                                       
NORTH CAROLINA -- (CONTINUED)
Mecklenburg County North Carolina, Public Improvement, Series
   A, GO Unlimited                                                 2,305,000   4.50   04/01/2011     2,395,955
State of North Carolina, Public Improvement, Series B, GO
   Unlimited                                                       1,500,000   4.00   04/01/2010     1,535,280
                                                                                                   -----------
                                                                                                     3,931,235
                                                                                                   -----------
OHIO -- 2.6%
Ohio State Building Authority Revenue Bonds, State Facilities
   Administration Building, Series A, INS: FSA                     1,020,000   5.25   10/01/2009     1,056,414
State of Ohio Revenue Bonds, Higher Education Facilities,
   Series II-A                                                     1,000,000   5.00   12/01/2010     1,050,920
                                                                                                   -----------
                                                                                                     2,107,334
                                                                                                   -----------
OKLAHOMA -- 1.3%
Oklahoma State Capital Improvement Authority State Facilities
   Revenue Bonds, Higher Education Projects, Series F,
   INS: AMBAC                                                      1,000,000   3.75   07/01/2009     1,016,350
                                                                                                   -----------
OREGON -- 1.9%
Portland Oregon Community College District, GO Unlimited           1,545,000   3.00   07/01/2009     1,562,428
                                                                                                   -----------
PENNSYLVANIA -- 4.0%
Allegheny County Pennsylvania HDA Revenue Bonds, University of
   Pittsburgh Medical Center, Series B                             1,000,000   5.00   06/15/2011     1,038,550
Lehigh County Pennsylvania General Purpose Hospital Revenue
   Bonds, Lehigh Valley Health Network, Series A, INS: FSA           800,000   4.00   07/01/2010       818,024
Pennsylvania State, GO Unlimited                                   1,325,000   5.25   02/01/2010     1,376,821
Washington County Pennsylvania Authority Revenue Bonds,
   University of Pennsylvania (a)                                     15,000   1.35   07/03/2008        15,000
                                                                                                   -----------
                                                                                                     3,248,395
                                                                                                   -----------
TENNESSEE -- 1.3%
Metropolitan Government Nashville & Davidson County Tennessee,
   Series A, GO Unlimited                                          1,000,000   5.00   01/01/2010     1,033,760
                                                                                                   -----------
TEXAS -- 6.9%
City of Austin Texas, Public Property Financial Contractual, GO
   Limited                                                         1,000,000   5.00   09/01/2010     1,045,360
State of Texas, Tax & Revenue Anticipation Notes, GO Limited
   Notes                                                           1,500,000   4.50   08/28/2008     1,506,480
Texas A&M University Revenue Bonds, Fing System                    1,000,000   3.70   05/15/2011     1,015,760
Texas State Public Finance Authority Revenue Bonds, INS: FGIC      1,955,000   4.00   02/01/2011     1,987,551
                                                                                                   -----------
                                                                                                     5,555,151
                                                                                                   -----------


                        See Notes to Financial Statements


                                        5



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED) (CONTINUED)



                                                                  PRINCIPAL
                                                                    AMOUNT/    RATE     DATE OF
                                                                    SHARES       %     MATURITY      VALUE $
                                                                  ----------   ----   ----------   -----------
                                                                                       
VIRGINIA -- 8.6%
Chesterfield County Virginia, Public Improvement, GO Unlimited     2,255,000   4.00   01/01/2010     2,301,972
Commonwealth of Virginia, Series B, GO Unlimited                   1,655,000   5.00   06/01/2011     1,746,571
Virginia College Building Authority Virginia Educational
   Facilities Revenue Bonds, 21st Century College, Series B        1,450,000   5.00   02/01/2010     1,502,969
Virginia State Public School Authority Revenue Bonds, Series VII   1,290,000   5.00   04/15/2011     1,355,880
                                                                                                   -----------
                                                                                                     6,907,392
                                                                                                   -----------
WASHINGTON -- 3.0%
Tacoma Washington Electrical Systems Revenue Bonds, Series A,
   INS: FSA                                                        1,500,000   5.75   01/01/2017     1,608,975
Whatcom County Washington School District No 506 Nooksack
   Valley, GO Unlimited, INS: School Building Guaranty               815,000   4.00   12/01/2009       832,743
                                                                                                   -----------
                                                                                                     2,441,718
                                                                                                   -----------
WISCONSIN -- 1.3%
South Milwaukee Wisonsin Promisory Notes, GO Unlimited, INS:
   MBIA                                                            1,000,000   4.38   06/01/2010     1,024,210
                                                                                                   -----------
Total Tax-Exempt Obligations
   (Cost $65,606,787)                                                                               65,282,350
                                                                                                   -----------
MONEY MARKET FUND -- 22.1%
State Street Institutional Tax Free Money Market Fund (b) (at
   net asset value)                                               17,817,244                        17,817,244
TOTAL INVESTMENTS(c) -- 103.0%
   (COST $83,424,031)                                                                               83,099,594
LIABILITIES IN EXCESS OF ASSETS -- (3.0)%                                                           (2,418,368)
                                                                                                   -----------
NET ASSETS -- 100.0%                                                                               $80,681,226
                                                                                                   ===========


(a)  Floating Rate Note- Interest rate shown is rate in effect at June 30, 2008
     with next reset date.

(b)  Affiliated issuer. See table that follows for more information.

(c)  Cost of investments shown approximates cost for federal income tax
     purposes.



ACRONYM                        NAME
- -------   ---------------------------------------------
       
AMBAC     American Municipal Bond Assurance Corporation
COPs      Certificates of Participation
EDA       Economic Development Authority
FGIC      Financial Guaranty Insurance Company
FSA       Financial Security Assurance
GO        General Obligation
HDA       Hospital Development Authority
HEFA      Health and Educational Facilities Authority


                        See Notes to Financial Statements


                                        6


STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

SCHEDULE OF INVESTMENTS - JUNE 30, 2008 (UNAUDITED) (CONTINUED)


    
INS    Insured
MBIA   Municipal Bond Investors Assurance
TAN    Tax Anticipation Note


AFFILIATE TABLE

Certain investments made by the Portfolio were made in mutual funds affiliated
with State Street Bank and Trust Company and SSgA Fund Management, Inc. ("SSgA
FM or "the Adviser"). The market value of this investment at June 30, 2008 is
listed in the Portfolio of Investments.



                                                                Shares sold                                Income Earned
                                            Shares purchased      for the       Number of                     for the
                        Number of shares    for the 6 months      6 months     shares held     Value at       6 months
Security Description   held at 12/31/2007     ended 6/30/08    ended 6/30/08    at 6/30/08     6/30/08     ended 6/30/08
- --------------------   ------------------   ----------------   -------------   -----------   -----------   -------------
                                                                                         
State Street
   Institutional Tax
   Free Money Market
   Fund                     2,410,373          60,034,045        44,627,174     17,817,244   $17,817,244      $47,047


                        See Notes to Financial Statements


                                       7



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 2008 (UNAUDITED)


                                                                                
ASSETS
Investments in unaffiliated issuers at market (identified cost $65,606,787)        $65,282,350
Investments in non-controlled affiliates at market (net asset value $17,817,244)
   (Note 4)                                                                         17,817,244
                                                                                   -----------
                                                                                    83,099,594
Receivables:
   Interest receivable                                                                 752,029
   Receivable from adviser (Note 4)                                                     12,251
   Prepaid expenses                                                                      5,151
                                                                                   -----------
      Total assets                                                                  83,869,025
LIABILITIES
Payables:
   Investment securities purchased                                                   3,151,237
   Due to custodian                                                                        937
   Management fee (Note 4)                                                               5,584
   Administration, custody and transfer agent fees (Note 4)                              1,141
   Professional fees                                                                    26,780
   Accrued expenses and other liabilities                                                2,120
                                                                                   -----------
      Total Liabilities                                                              3,187,799
                                                                                   -----------
NET ASSETS                                                                         $80,681,226
                                                                                   ===========


                       See Notes to Financial Statements.


                                       8



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 2008 (UNAUDITED)


                                                                       
INVESTMENT INCOME
   Interest income - unaffiliated issuers                                 $ 576,105
   Interest income - non-controlled affiliated issuer                        47,047
                                                                          ---------
      Total Investment Income                                               623,152
EXPENSES
   Professional fees                                                         30,312
   Management fees (Note 4)                                                  22,502
   Trustees' fees (Note 5)                                                    5,784
   Printing fees                                                                850
   Administration, custody and transfer agent fees (Note 4)                   4,578
   Other expenses                                                             2,242
                                                                          ---------
      Total Expenses                                                         66,268
   Less: Fee waivers/reimbursements by investment adviser (Note 4)          (43,766)
                                                                          ---------
      Total Net Expenses                                                     22,502
                                                                          ---------
NET INVESTMENT INCOME                                                     $ 600,650
REALIZED AND UNREALIZED GAIN (LOSS)
Net change in net unrealized appreciation (depreciation) on investments    (349,755)
                                                                          ---------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                      $ 250,895
                                                                          =========


                       See Notes to Financial Statements.


                                       9



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

STATEMENTS OF CHANGES IN NET ASSETS



                                                                          For the Six
                                                                          Months Ended        For the
                                                                         June 30, 2008       Year Ended
                                                                          (Unaudited)    December 31, 2007*
                                                                         -------------   ------------------
                                                                                   
INCREASE IN NET ASSETS FROM:
OPERATIONS
   Net investment income                                                  $   600,650       $ 1,149,525
   Change in net unrealized appreciation (depreciation) of investments       (349,755)           25,318
                                                                          -----------       -----------
      Net increase in net assets resulting from operations                    250,895         1,174,843
                                                                          -----------       -----------
CAPITAL TRANSACTIONS
   Proceeds from contributions                                             40,011,942        39,422,181
   Fair value of withdrawals                                                  (48,987)         (129,648)
                                                                          -----------       -----------
   Net increase in net assets from capital transactions                    39,962,955        39,292,533
                                                                          -----------       -----------
TOTAL NET INCREASE IN NET ASSETS                                           40,213,850        40,467,376
NET ASSETS
Beginning of period                                                        40,467,376                --
                                                                          -----------       -----------
End of period                                                             $80,681,226       $40,467,376
                                                                          ===========       ===========


*    The Portfolio commenced operations on February 7, 2007.

                       See Notes to Financial Statements.


                                       10



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO

FINANCIAL HIGHLIGHTS

The following table includes selected supplemental data and ratios to average
net assets:



                                       Six Months
                                         Ended          Year
                                       6/30/2008       Ended
                                      (Unaudited)   12/31/2007*
                                      -----------   -----------
                                              
SUPPLEMENTAL DATA AND RATIOS:
   Net assets, end of period (000s)   $80,681       $40.467
   Ratios to average net assets:
      Gross operating expenses           0.29%**       0.35%**
      Net operating expenses             0.10%**       0.10%**
      Net investment income              2.67%**       3.58%**
   Portfolio turnover rate             121.29%***     31.18%***
   Total return(a)                       0.89%         3.33%


- ----------
*    The Portfolio commenced operations on February 7, 2007.

**   Annualized.

***  Not annualized

(a)  Results represent past performance and are not indicative of future
     results. Total return for periods of less than one year are not annualized.

                       See Notes to Financial Statements.


                                       11



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO
NOTES TO FINANCIAL STATEMENTS
JUNE 30, 2008 (UNAUDITED)

1. ORGANIZATION

The State Street Master Funds (the "Trust") is registered under the Investment
Company Act of 1940, as amended (the "1940 Act"), as an open-end management
investment company, and was organized as a business trust under the laws of The
Commonwealth of Massachusetts on July 27, 1999. The Trust comprises eleven
investment portfolios: the State Street Equity 500 Index Portfolio, the State
Street Equity 400 Index Portfolio, the State Street Equity 2000 Index Portfolio,
the State Street Aggregate Bond Index Portfolio, the State Street Money Market
Portfolio, the State Street Tax Free Money Market Portfolio, the State Street
Short-Term Tax Exempt Bond Portfolio, the State Street Limited Duration Bond
Portfolio, the State Street Treasury Money Market Portfolio, the State Street
Treasury Plus Money Market Portfolio and the State Street U.S. Government Money
Market Portfolio. Information presented in these financial statements pertains
only to the State Street Short-Term Tax Exempt Bond Portfolio (the "Portfolio").
The Portfolio commenced operations on February 7, 2007. At June 30, 2008, only
the Portfolio, the State Street Equity 500 Index Portfolio, the State Street
Money Market Portfolio, the State Street Tax Free Money Market Portfolio, the
State Street Treasury Money Market Portfolio, the State Street Treasury Plus
Portfolio and the State Street U.S. Government Money Market Portfolio were in
operation. The Portfolio is authorized to issue an unlimited number of
non-transferable beneficial interests.

At a meeting of the Board of Trustees of the State Street Master Funds held on
February 21, 2008, the Board of Trustees of the State Street Master Funds
approved the change in designation of the State Street Tax Free Limited Duration
Bond Portfolio, a series of the State Street Master Funds into which the Fund
invests substantially all of its assets. Therefore all references to the State
Street Tax Free Limited Duration Bond Portfolio in the Semi-annual are hereby
deleted and replaced with the designation: "State Street Short-Term Tax Exempt
Bond Portfolio."

2. SIGNIFICANT ACCOUNTING POLICIES

The following is a summary of the significant accounting policies consistently
followed by the Portfolio in the preparation of its financial statements.

SECURITY VALUATION: The Portfolio's investments are valued each business day by
independent pricing services. Fixed-income securities are valued on the basis of
the closing bid price. Investments in other mutual funds are valued at the net
asset value per share. Money market instruments maturing within 60 days of the
valuation date are valued at amortized cost, a method by which each money market
instrument is initially valued at cost, and thereafter a constant accretion or
amortization of any discount or premium is recorded until maturity of the
security. The Portfolio may value securities for which market quotations are not
readily available at "fair value," as determined in good faith pursuant to
procedures established by the Board of Trustees.

The Portfolio adopted Financial Accounting Standards Board Statement of
Financial Accounting Standards No. 157, Fair Value Measurements ("FAS 157"),
effective for financial statements issued for fiscal years beginning after
November 15, 2007 and interim periods within those fiscal years. In accordance
with FAS 157, fair value is defined as the price that the portfolio would
receive upon selling an investment in a timely transaction to an independent
buyer in the principal or most advantageous market of the investment. Various
inputs are used in determining the value of the Fund's investments. FAS 157
established a three tier hierarchy of inputs to establish a classification of
fair value measurements and disclosure. The three tier hierarchy of inputs is
summarized below:

     -    Level 1 - quoted prices in active markets for identical securities

     -    Level 2 - other significant observable inputs (including quoted prices
          for similar securities, interest rates, prepayment speeds, credit
          risk, etc.)

     -    Level 3 - significant unobservable inputs (including the Fund's own
          assumptions in determining the fair value of investments)

The inputs or methodology used for valuing securities are not an indication of
the risk associated with investing in those securities.

The following is a summary of the inputs used, as of June 30, 2008, in valuing
the Fund's assets carried at fair value:


                                       12



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
JUNE 30, 2008 (UNAUDITED)



                               INVESTMENTS IN
VALUATION INPUTS                 SECURITIES
- ----------------               --------------
                            
Level 1 - Quoted Prices                   --
Level 2 - Other Significant
   Observable Inputs             $83,099,594
Level 3 - Significant
   Unobservable Inputs                    --
                                 -----------
   TOTAL                         $83,099,594
                                 ===========


SECURITIES TRANSACTIONS, INVESTMENT INCOME AND EXPENSES: Securities transactions
are recorded on a trade date basis for financial statement purposes. Interest
income is recorded daily on the accrual basis and includes amortization of
premium and accretion of discount on investments. Realized gains and losses from
securities transactions are recorded on the basis of identified cost. Expenses
are accrued daily based on average daily net assets.

All of the net investment income and realized and unrealized gains and losses
from the security transactions of the Portfolio are allocated pro rata among the
partners in the Portfolio based on each partner's daily ownership percentage.

FEDERAL INCOME TAXES: The Portfolio is not required to pay federal income taxes
on its net investment income and net capital gains because it is treated as a
partnership for federal income tax purposes. All interest, dividends, gains and
losses of the Portfolio are deemed to have been "passed through" to the
Portfolio's partners in proportion to their holdings in the Portfolio,
regardless of whether such items have been distributed by the Portfolio. Each
partner is responsible for tax liability based on its distributive share;
therefore, no provision has been made for federal income taxes.

The Portfolio adopted the provisions of Financial Accounting Standards Board
Interpretation No. 48 (FIN 48), "Accounting for Uncertainty in Income Taxes", on
June 29, 2007. As of and during the six months ended June 30, 2008, the
Portfolio did not have a liability for any unrecognized tax expenses. The
Portfolio recognizes interest and penalties, if any, related to tax liabilities
as income tax expense in the Statement of Operations. As of June 30, 2008, tax
years 2004 through 2007 remain subject to examination by the portfolio's major
tax jurisdictions, which include the United States of America and the
Commonwealth of Massachusetts.

USE OF ESTIMATES: The Portfolio's financial statements are prepared in
accordance with U.S. generally accepted accounting principles which require the
use of management estimates. Actual results could differ from those estimates.

3. SECURITIES TRANSACTIONS

For the six months ended June 30, 2008, purchases and sales of investment
securities, excluding short-term investments, futures contracts, and in-kind
contributions and withdrawals, aggregated to $79,690,900 and $51,725,000,
respectively.

At June 30, 2008, the book cost of investments was $83,424,031 which
approximates cost computed on a federal tax basis. The aggregate gross
unrealized appreciation and gross unrealized depreciation was $52,432 and
$376,869, respectively, resulting in net depreciation of $324,437 for all
securities as computed on a federal income tax basis.

4. RELATED PARTY FEES

The Portfolio has entered into an investment advisory agreement with SSgA FM.
The Adviser directs the investments of the Portfolio in accordance with its
investment objective, policies, and limitations. In compensation for the
Adviser's services as investment adviser, the Portfolio pays the Adviser an
annual fee of 0.10% of the Portfolio's average daily net assets. The Adviser has
contractually agreed to cap the total operating expenses of the Portfolio at
0.10% of the Portfolio's average daily net assets until November 1, 2008. For
the six months ended June 30, 2008, SSgA FM reimbursed the Portfolio $43,766
under this agreement.

State Street is the administrator, custodian and transfer agent for the
Portfolio. In compensation for State Street's services as administrator,
custodian and transfer agent, the Trust pays State Street an annual fee, which
is accrued daily at the applicable


                                       13


STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
JUNE 30, 2008 (UNAUDITED)

fee rate described below and payable monthly, of the following annual
percentages of the Trust's average aggregate daily net assets during the month
as follows:



                                Annual percentage of average
Asset Levels                     aggregate daily net assets
- ------------                    ----------------------------
                             
First $400 Million                            0.03%
Thereafter                                    0.02
Minimum annual fee per trust:             $150,000


5. TRUSTEES' FEES

The Trust pays each trustee who is not an officer or employee of SSgA FM or
State Street $2,500 for each meeting of the Board of Trustees and an additional
$500 for each telephonic meeting attended. The Trust also pays each trustee an
annual retainer of $30,000. Each trustee is reimbursed for out-of-pocket and
travel expenses.

6. INDEMNIFICATIONS

The Trust's organizational documents provide that its officers and trustees are
indemnified against certain liabilities arising out of the performance of their
duties to the Trust. In addition, both in some of its principal service
contracts and in the normal course of its business, the Trust enters into
contracts that provide indemnifications to other parties for certain types of
losses or liabilities. The Trust's maximum exposure under these arrangements is
unknown as this could involve future claims against the Trust. Management does
not expect any significant claims.

7. NEW ACCOUNTING PRONOUNCEMENTS

In March 2008, the Financial Accounting Standards board ("FASB") issued
Statement of Financial Accounting Standards No.161, "Disclosures about
Derivative Instruments and Hedging Activities ("SFAS 161"). SFAS 161 is
effective for fiscal years and interim periods beginning after November 15,
2008. SFAS 161 requires enhanced disclosures about Funds' derivative and hedging
activities. Management is currently evaluating the impact the adoption of SFAS
161 will have on the Funds' financial statement disclosures.


                                       14



STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO
JUNE 30, 2008

GENERAL INFORMATION (UNAUDITED)

PROXY VOTING POLICIES AND PROCEDURES AND RECORD

The Trust has adopted proxy voting procedures relating to portfolio securities
held by the Fund. A description of the policies and procedures is available (i)
without charge, upon request, by calling (877) 521-4083 or (ii) on the website
of the Securities Exchange Commission (the "SEC") at www.sec.gov. Information on
how the Fund voted proxies relating to portfolio securities during the most
recent 12-month period ended June 30 is available by August 31 (i) without
charge, upon request, by calling (877)521-4083 or (ii) on the SEC's website at
www.sec.gov.

QUARTERLY PORTFOLIO SCHEDULE

The Trust files a complete schedule of portfolio holdings with the SEC for the
first and third quarters of its fiscal year (as of March and September of each
year) on Form N-Q. The Trust's Forms N-Q are available on the SEC's website at
www.sec.gov. The Trust's Forms N-Q may be reviewed and copied at the SEC's
Public Reference Room in Washington, D.C. and information on the operation of
the Public Reference Room may be obtained by calling 1-800-SEC-0330. The most
recent Form N-Q is available without charge, upon request, by calling (877)
521-4083.


                                       15



TRUSTEES
Michael F. Holland
William L. Boyan
Rina K. Spence
Douglas T. Williams
James E. Ross

INVESTMENT ADVISER
SSgA Funds Management, Inc.
State Street Financial Center
One Lincoln Street
Boston, MA 02111

ADMINISTRATOR AND CUSTODIAN
State Street Bank and Trust Company
State Street Financial Center
One Lincoln Street
Boston, MA 02111

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
Ernst & Young LLP
200 Clarendon Street
Boston, MA 02116

LEGAL COUNSEL
Ropes & Gray LLP
One International Place
Boston, MA 02110

This report is for shareholder information. This is not a prospectus intended
for use in the purchase or sale of shares of beneficial interest.

STATE STREET SHORT-TERM TAX EXEMPT BOND PORTFOLIO
State Street Bank and Trust Company
P.O. Box 5049
Boston, MA 02206


                                       16


ITEM 2. CODE OF ETHICS.

Not applicable to this filing.

ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

Not applicable to this filing.

ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

Not applicable to this filing.

ITEM 5. AUDIT COMMITTEES OF LISTED REGISTRANTS.

Not applicable to the Registrant.

ITEM 6. SCHEDULE OF INVESTMENTS.

Schedules of Investments are included as part of the reports to shareholders
filed under Item 1 of this Form N-CSR.

ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END
MANAGEMENT INVESTMENT COMPANIES.

Not applicable to the Registrant.

ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES

Not applicable to the Registrant.

ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT
COMPANY AND AFFILIATED PURCHASERS.

Not applicable to the Registrant.

ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

Not applicable to the Registrant.

ITEM 11. CONTROLS AND PROCEDURES.

(a) The Trust's principal executive officer and principal financial officer have
concluded that the Trust's disclosure controls and procedures (as defined in
Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940
Act")) are effective, as of a date within 90 days of the filing date of the
report that includes the disclosure required by this paragraph, based on their
evaluation of these controls and procedures required by Rule 30a-3(b) under the
1940 Act and Rules 13a-15(b) or 15d-15(b) under the Securities Exchange Act of
1934.



(b) There were no changes in the Trust's internal control over financial
reporting (as defined in Rule 30a-3(d) under the 1940 Act) that occurred during
the Trust's second fiscal quarter covered by this Form N-CSR filing that has
materially affected, or is reasonably likely to materially affect, the Trust's
internal control over financial reporting.

ITEM 12. EXHIBITS.

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

(b) Certifications of principal executive officer and principal financial
officer of the Trust as required by Rule 30a-2(b) under the 1940 Act.



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): State Street Master Funds


By: /s/ James E. Ross
    ---------------------------------
    James E. Ross
    President

Date: August 20, 2008

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/ James E. Ross
    ---------------------------------
    James E. Ross
    President


By: /s/ Gary L. French
    ---------------------------------
    Gary L. French
    Treasurer

Date: August 20, 2008