GREEN CENTURY FUNDS
N-30D, 1999-09-29
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<PAGE>



                       [GREEN CENTURY LOGO APPEARS HERE]

                                                                  ANNUAL REPORT

                                                    Green Century Balanced Fund
                                                      Green Century Equity Fund
                                                                  July 31, 1999



An Investment For Your Future.     29 Temple Place, Boston, Massachusetts 02111

For information on the Green Century Funds (R), call 1-800-93-GREEN. For
information on how to open an account and account services, call 1-800-221-
5519 9:00 am to 5:00 pm Eastern Time, Monday through Friday. For share price
and account information, call 1-800-221-5519, twenty-four hours a day.
- -------------------------------------------------------------------------------
           Dear Green Century Funds Shareholder:

           In 1991, a partnership of non-profit environmental advocacy
organizations founded the Green Century Funds. Since that time, our mission
has been to seek solid financial returns for environmentally conscious
investors while promoting greater corporate environmental accountability. We
are pleased to report to our shareholders our progress toward these goals.
           Total assets under management in the two Green Century Funds
increased by over 40% in the past year while the number of Green Century Funds
investors grew by over 35%. Green Century welcomes our many new investors and
thanks our long-term shareholders for your continued commitment to
environmentally responsible investing.
           The Green Century Equity Fund's performance was competitive during
its fiscal year ended July 31, 1999. While the Green Century Balanced Fund
underperformed other balanced funds for the one year period, its shorter term
performance in Calendar Year 1999 improved markedly. A fuller discussion of
the returns of each of the Funds follows.*

           The Green Century Equity Fund's (the "Equity Fund") total return
for its fiscal year ended July 31, 1999 was 21.56%, exceeding the return of
the Standard & Poor's 500 Index (the "S&P 500(R) Index")/1/ of 20.20% and
well-above the 14.88% average total return of the growth and income funds
tracked by Morningstar for the same period./2/ In comparison to the S&P 500(R)
Index, the Equity Fund benefitted from its overexposure to the
telecommunications and electronics industries; conversely, the Equity Fund
suffered from its overexposure to the non-alcoholic beverages industry and its
lack of exposure to liquor stocks.
           For the three-year period ended July 31, 1999, the average annual
total return for the Equity Fund was 31.20%, exceeding the 29.69% for the S&P
500(R) Index and surpassing the 23.17% average annual total return of growth
and income funds tracked by Morningstar for the same time period. The five-
year average annual total return of the Equity Fund as of July 31, 1999 was
26.22%, just slightly behind the S&P 500(R) Index's 26.24% but beating the
Morningstar average annual total return of growth and income funds of 20.96%
for the same period. Since inception on June 3, 1991, the average annual total
return for the Equity Fund was 18.44%./3/

*The performance data quoted represents past performance and is not a
guarantee of future results. Investment return and principal value of an
investment will fluctuate so that an investor's shares, when redeemed, may be
worth more or less than their original cost.
<PAGE>

           The Equity Fund invests primarily in a portfolio of the 400
companies that comprise the Domini 400 Social Index, a broadly diversified
portfolio which excludes companies with the worst environmental and social
records. As of July 31, 1999, 99.71% of the net assets of the Equity Fund were
invested in the stocks of the 400 companies.

           The Green Century Balanced Fund's (the "Balanced Fund") total
return for the fiscal year ended July 31, 1999 was 4.93%; the average total
return of balanced funds tracked by Morningstar was 9.09% for the same
period./4/ The Balanced Fund's underperformance for the fiscal year ended July
31, 1999 is primarily attributable to the Balanced Fund's poor performance in
the first quarter of the fiscal year. The Balanced Fund's concentration in
small to mid capitalization stocks and high yield bonds led to its
underperformance in the quarter ended October 31, 1998, a period during which
the stocks of larger companies and investment grade bonds outperformed the
stocks of smaller and mid-sized companies and non-investment grade bonds.
Since October 1998, the Balanced Fund's performance has improved during a
period in which the market has broadened, high yield bonds are outperforming
long-term corporate and treasury bonds, and the value of several key
environmentally responsible stocks in which the Balanced Fund is invested is
being recognized.
           For the period January 1, 1999 through July 31, 1999, the Balanced
Fund's total return was 9.47% compared to the 3.63% average total return of
balanced funds tracked by Morningstar for the same period.
           As of July 31, 1999, the three- and five-year average annual total
returns of the Balanced Fund were 10.43% and 11.64%, respectively, as compared
to the three- and five-year Morningstar balanced fund average annual total
returns of 15.53% and 14.59% for the same time periods. Since inception on
March 18, 1992, the Balanced Fund's average annual total return was 7.75%.
           The Balanced Fund invests primarily in the stocks and bonds of
select companies that have clean environmental records, many of which also
make positive environmental contributions; including companies that produce
renewable energy and those that offer effective remedies for existing
environmental problems. The Balanced Fund also invests in those companies that
have minimized their adverse impact on the environment and those companies
Green Century believes are "best in their class" companies that are setting
standards for environmental protection in their industries.
           While the Balanced Fund's portfolio is not focused on any one
industry sector, as of July 31, 1999, the Balanced Fund held several stocks
and a bond of companies in the business of generating renewable energy.
Denmark's Vestas Wind Systems is the largest manufacturer of wind turbines
worldwide. York Research Corporation of New York develops, constructs, owns,
and operates electric power facilities fueled by solar energy and wind power.
AstroPower, Inc. of Newark, Delaware, the largest US manufacturer of
photovoltaic solar cells, sells its solar power to electricity providers.
Calpine Corporation, located in San Jose, California, generates geothermal
energy./5/
           The Worldwatch Institute reports that between 1990 and 1998, wind
use expanded by 22 percent and photovoltaic energy by 16 percent, as opposed
to a 2 percent increase for oil use and no increase for nuclear power
generation--potentially positive news for both the environment and
environmentally concerned investors. The Balanced Fund is pleased to have a
stake in this market.

           Shareholder advocacy is critical to the Green Century Funds'
mission of promoting greater corporate environmental responsibility. Using the
collective leverage of Green Century Funds' shareholders, the Funds seek to
hold companies accountable for the impact of their actions on the environment.
           This year the Green Century Funds are coordinating their
shareholder advocacy with a national public education campaign launched by
Green Century's non-profit environmental advocacy

                                       2
<PAGE>

founders, the Public Interest Research Groups (PIRGs). Our common goal is to
preserve the Coastal Plain of the Arctic National Wildlife Refuge from oil
drilling. The Coastal Plain is the only conservation area in the nation that
provides a complete range of Arctic ecosystems balanced with a wide variety of
wildlife including large populations of caribou, muskoxen, brown, black and
polar bears, wolves, Dall sheep, snow geese and thousands of other migratory
birds. The 125-mile long Coastal Plain is the only section of Alaska's 1,100-
mile long North Slope not open for oil drilling.
           The Green Century Equity Fund, on behalf of the Domini Social
Index, the portfolio in which the Equity Fund invests substantially all of its
investable assets, filed a shareholder resolution with Atlantic Richfield
Company (ARCO)/6/ in November of 1998. The resolution pressed ARCO to
unconditionally cancel any future plans for oil drilling in the Arctic
National Wildlife Refuge and immediately stop the expenditure of any corporate
funds targeted to achieve this objective.
           Following a meeting with senior ARCO management in January 1999,
the resolution was voted on at ARCO's annual meeting on May 3, 1999 in Los
Angeles, CA. The Green Century Equity Fund is pleased to report that 4.7% of
ARCO shareholders voted in support of our resolution--enough votes to allow
the Equity Fund to re-introduce the resolution at the company's annual meeting
next year and continue to press ARCO's management to refrain from drilling in
the Refuge.

           Thank you for your commitment to environmentally responsible
investing and your investment in the Green Century Funds.

           Respectfully,

           The Green Century Funds

/1/ The S&P 500(R) Index is an unmanaged index of 500 selected common stocks,
most of which are listed on the New York Stock Exchange. The S&P 500(R) Index
is heavily weighted toward stocks with large market capitalizations and
represents approximately two-thirds of the total market value of all domestic
stocks.
/2/ The Morningstar growth and income fund category consists of funds where
growth of capital and current income are near-equal objectives. Investments
are typically selected for both appreciation potential and dividend-paying
ability.
/3/ The Green Century Equity Fund, which commenced investment operations in
September 1995, invests all its assets in an existing separate registered
investment company which has the same investment objective as the Fund (the
"Index Portfolio"). Consistent with regulatory guidance, the performance for
the period prior to the Fund's inception reflects the performance of the Index
Portfolio adjusted to reflect the deduction of the charges and expenses of the
Fund.
/4/ The Morningstar balanced fund category consists of funds that seek both
income and capital appreciation by investing in a generally fixed combination
of stocks and bonds. These funds generally hold a minimum of 25% of their
assets in fixed-income securities at all times.
/5/ As of July 31, 1999, the above named companies composed the following
percentages of the portfolio of the Balanced Fund: Vestas Wind Systems 2.81%;
York Research Corporation 1.74%; AstroPower, Inc. 1.41%; and Calpine
Corporation 1.68%. The holdings of the Balanced Fund may change due to ongoing
management of the Fund. References to specific investments should not be
construed as a recommendation of the securities by the Funds, the adviser or
their distributor.
/6/ As of July 31, 1999, ARCO comprised 0.49% of the portfolio in which the
Equity Fund invests. Holdings may change due to ongoing management. References
to specific investments should not be construed as a recommendation of the
security by the Funds or their distributor.
This material must be preceded or accompanied by a current prospectus.
Distributor: Sunstone Distribution Services, LLC 9/99

                                       3
<PAGE>

                     MANAGEMENT'S DISCUSSION AND ANALYSIS

GREEN CENTURY BALANCED FUND
  Investment Objective--The Green Century Balanced Fund seeks capital growth
and income from a diversified portfolio of equity and fixed-income securities.
The Fund invests in the securities of environmentally responsible and
environmentally proactive companies.
  Portfolio Orientation--The Fund is invested in equity and fixed income
securities of performance driven, environmentally responsible companies.
Equity holdings focus on growth companies that have earnings growth greater
than that of the overall market, a rate of growth that the Fund's portfolio
manager believes will ultimately generate superior stock performance. The Fund
also invests in the stocks of small and micro-capitalization companies; the
Fund's portfolio manager believes that the environmentally distinguished
companies in which the Fund seeks to invest tend to have smaller market
capitalizations and that investments in such companies may offer greater
opportunities for growth as well as greater risks for price fluctuations than
larger, more established companies. The fixed-income portion of the portfolio
is comprised of debt of investment and non-investment grade environmentally
responsible companies.
  Economic Environment--With a strong economy and tight labor conditions, the
Federal Reserve Bank is concerned about inflation and is raising interest
rates modestly. In a period of rising rates, stock selection rather than asset
allocation produces the best absolute and relative returns.
  Investment Strategy and Performance--The Balanced Fund's investment advisers
believe that environmental responsibility and economic gain go hand in hand.
The premise of the Fund is that environmental responsibility enhances
corporate profitability, which in turn may produce competitive shareholder
returns.
  The performance objective of the Fund is to be in the top quartile of all
balanced funds. In order to reach this goal, the Fund is positioned in
financially driven companies that are selling ecologically sustainable
solutions and other companies with clean environmental records.
Environmentally sound companies frequently enjoy higher profitability through
lower costs and participation in growth markets. In addition, this investment
strategy helps to avoid companies at risk due to exposure to environmental
liability.
  The Fund's total return for the year ended July 31, 1999 was 4.93%, compared
to 9.54% for the average of the balanced funds tracked by Lipper Analytical
Services, Inc. during the same period. For the five years ended July 31, 1999,
the Balanced Fund's average annual total return was 11.64%, compared to 16.11%
for the average balanced fund tracked by Lipper. The Fund's average annual
total return since inception on March 18, 1992 was 7.75%.

The S&P 500(R) Index is an unmanaged index of 500 stocks. The Lipper Balanced
Fund Index includes the 30 largest funds whose primary objective is to conserve
principal by maintaining at all times a balanced portfolio of both stocks and
bonds. Typically the stock/bond ratio ranges around 60%/40%.

The benchmark to which the Balanced Fund is compared in the accompanying chart
was changed from the Micropal Balanced Fund Index and the Micropal Environmental
Sector Index to the Lipper Balanced Fund Index. The Lipper Balanced Fund Index
is a better known and more widely published benchmark than the Micropal indices.
A hypothetical $10,000 investment in the Micropal Balanced Fund Index and the
Micropal Environmental Sector Index on March 31, 1992 would have values of
$20,099 and $7,195, respectively, as of July 31, 1999. A hypothetical investment
at July 31, 1998 of $10,000 in the Fund, the S&P 500(R) Index, the Lipper
Balanced Fund Index, the Micropal Balanced Fund Index, and the Micropal
Environmental Sector Index would have values of $10,493, $12,020, $11,074,
$10,946, and $9,590, respectively, as of July 31, 1999.

                           [LINE GRAPH APPEARS HERE]

                    Balanced Fund    S&P 500         Lipper Balanced Index
                    -------------    -------         ---------------------
        3/31/92         10,000        10,000                 10,000
        6/30/92         10,015        10,190                 10,160
        6/30/93         10,385        11,580                 11,619
        6/30/94          9,987        11,742                 11,713
        6/30/95         11,486        14,804                 13,529
        6/30/96         14,010        18,653                 15,534
        6/30/97         16,142        25,125                 18,737
        6/30/98         18,262        32,703                 22,187
        7/31/98         16,792        32,355                 21,927
        7/31/99         17,620        38,892                 24,283


                          AVERAGE ANNUAL TOTAL RETURN
           -----------------------------------------------------------
<TABLE>
         <S>                                                              <C>
         One year ended July 31, 1999....................................  4.93%
           ---------------------------------------------------------------------
         Five years ended July 31, 1999.................................. 11.64%
           ---------------------------------------------------------------------
         Inception (March 18, 1992) to July 31, 1999.....................  7.75%
</TABLE>


                                       4
<PAGE>

                     MANAGEMENT'S DISCUSSION AND ANALYSIS

GREEN CENTURY EQUITY FUND
  Investment Objective--The Green Century Equity Fund seeks long-term total
return from a diversified portfolio of stocks which corresponds to the
performance of an index consisting of approximately 400 companies which
conform to basic standards for environmental and social corporate
responsibility.
  Portfolio Orientation--The Fund seeks to achieve its investment objective by
investing all its investable assets in the Domini Social Index Portfolio (the
"Index Portfolio") which has the same investment objective as the Fund. Like
other index funds, the Equity Fund is not actively managed in the traditional
investment sense, but rather seeks to track the performance of a broad based
index. The Equity Fund thus provides an investor with the opportunity to be
nearly fully invested at all times in a broad and diverse portfolio of stocks
which meet certain environmental and social criteria.
  In evaluating stocks for inclusion in the Index Portfolio, a company's
environmental performance, employee relations, corporate citizenship, and the
quality of the company's products and its attitudes with regard to consumer
issues are considered. Companies are excluded which, based on data available,
derive more than 2% of their gross revenues from the sale of military weapons;
derive any revenues from the manufacture of tobacco products or alcoholic
beverages; derive any revenues from gambling enterprises; own directly or
operate nuclear power plants or participate in businesses related to the
nuclear fuel cycle.
  Investment Strategy and Performance--The Equity Fund's managers believe that
enterprises which exhibit a social awareness should be better prepared to meet
future societal needs for goods and services and may be less likely to incur
certain legal liabilities that may be charged when a product or service is
determined to be harmful. The Fund's managers also believe that such
enterprises should over the long term be able to provide investors with a
return that is competitive with enterprises that do not exhibit such social
and environmental awareness.
  The Fund's total return for its fiscal year was 21.56%, compared to 20.20%
for the Standard & Poor's 500(R) Index (the "S&P 500(R) Index"). For the five
years ended July 31, 1999, the Equity Fund's average annual total return was
26.22%, compared to 26.24% for the S&P 500(R) Index. The Fund's average annual
total return since inception on June 3, 1991 was 18.44%.*

The S&P 500(R) Index is an unmanaged index of 500 stocks. Its performance
reflects reinvestment of dividends and distributions but not management and
other operating expenses, as does the Fund's performance. Performance on the
accompanying graph for the S&P 500(R) Index commences on May 31, 1991.

                           [LINE GRAPH APPEARS HERE]


                                  Equity Fund     S&P 500
                                  -----------     -------
                       6/3/91        10,000        10,000
                      7/31/91         9,987         9,987
                      7/31/92        11,137        11,264
                      7/31/93        12,162        12,249
                      7/31/94        12,425        12,880
                      7/31/95        15,442        16,243
                      7/31/96        17,628        18,934
                      7/31/97        26,996        28,807
                      7/31/98        32,752        34,362
                      7/31/99        39,813        41,304




                          AVERAGE ANNUAL TOTAL RETURN
           ----------------------------------------------------------
<TABLE>
         <S>                                                              <C>
         One year ended July 31, 1999.................................... 21.56%
           ---------------------------------------------------------------------
         Five years ended July 31, 1999*................................. 26.22%
           ---------------------------------------------------------------------
         Inception (June 3, 1991) to July 31, 1999*...................... 18.44%
</TABLE>


* The Green Century Equity Fund, which commenced investment operations in
September, 1995, invests all of its investable assets in an existing separate
registered investment company which has the same investment objective as the
Fund (the "Index Portfolio"). Consistent with regulatory guidance, performance
for the period prior to the Fund's inception reflects the performance of the
Index Portfolio adjusted to reflect the deduction of the charges and expenses
of the Fund.

                                       5
<PAGE>

                          GREEN CENTURY BALANCED FUND
                            PORTFOLIO OF INVESTMENTS

                                 July 31, 1999
COMMON STOCKS--73.2%

<TABLE>
<CAPTION>
                                                           SHARES     VALUE
<S>                                                        <C>     <C>
Technology--15.5%
ADE Corp. (b).............................................  32,500 $   394,062
American Power Conversion Corp. (b).......................  20,000     415,000
Dionex Corp. (b)..........................................   1,000      43,187
Gartner Group, Inc.--Class B (b)..........................   1,302      28,156
Intel Corp................................................     400      27,600
Internet Capital Group, Inc. (b)(g).......................     600         --
Macromedia, Inc. (b)......................................   4,000     140,000
Project Software & Development, Inc. (b)..................  12,000     510,000
Safeguard Scientifics, Inc. (b)...........................   6,000     384,000
Texas Instruments.........................................   3,000     432,000
U.S. Interactive, Inc. (b)(h).............................     300         --
                                                                   -----------
                                                                     2,374,005
                                                                   -----------
Environmental Products & Services--15.5%
Galileo Corp. (b)......................................... 110,000   1,409,375
Hi-Rise Recycling Systems, Inc. (b)....................... 122,000     366,000
Ionics, Inc. (b)..........................................  10,000     338,750
KTI, Inc. (b).............................................  10,000     149,375
Thermo Trilogy Corp. (b)(d)(e)............................  12,000      99,000
                                                                   -----------
                                                                     2,362,500
                                                                   -----------
Health Services & Hospital Supplies--12.6%
ChromaVision Medical Systems, Inc. (b)....................  15,000     224,062
IMS Health Incorporated...................................  10,000     278,750
MedImmune, Inc. (b).......................................   5,000     399,375
QLT PhotoTherapeutics Inc. (b)............................   5,000     318,906
QuadraMed Corp. (b).......................................  35,000     364,221
Thermo BioAnalysis Corp. (b)..............................  18,500     337,625
                                                                   -----------
                                                                     1,922,939
                                                                   -----------
Natural Foods & Nutraceuticals--8.9%
Balance Bar Company (b)...................................  50,000     318,750
Horizon Organic Holding Corp. (b).........................  10,000     123,750
Rexall Sundown, Inc. (b)..................................  20,000     248,750
United Natural Foods, Inc. (b)............................  12,000     223,126
Whole Foods Market, Inc. (b)..............................  10,000     440,000
                                                                   -----------
                                                                     1,354,376
                                                                   -----------
</TABLE>

<TABLE>
<CAPTION>
                                                           SHARES      VALUE
<S>                                                       <C>       <C>
Renewable Energy--5.9%
AstroPower, Inc. (b).....................................   15,000  $   214,687
Vestas Wind Systems A/S (b)(c)...........................    4,000      428,112
York Research Corp. (b)..................................   50,000      265,625
                                                                    -----------
                                                                        908,424
                                                                    -----------
Financial Services--5.8%
21st Century Holding Co. (b).............................   15,000       97,500
American International Group, Inc........................      150       17,419
Banco Latinoamericano de Exportaciones, S.A.--
 E shares (c)............................................   12,000      319,500
Eaton Vance Corp.........................................   13,000      452,563
                                                                    -----------
                                                                        886,982
                                                                    -----------
Communications--4.4%
Medialink Worldwide, Inc. (b)............................   10,000      151,250
MCI Worldcom, Inc. (b)...................................    2,000      165,000
Time Warner, Inc.........................................      200       14,400
Valassis Communications, Inc. (b)........................    9,000      335,250
                                                                    -----------
                                                                        665,900
                                                                    -----------
Pharmaceuticals--4.0%
Alkermes, Inc. (b).......................................   18,000      470,250
MGI Pharma, Inc. (b).....................................   12,000      135,000
                                                                    -----------
                                                                        605,250
                                                                    -----------
Commercial Products & Services--0.6%
Perficient, Inc. (b).....................................   10,000       97,500
                                                                    -----------
Paper & Forest Products--0.0%
Champion International Corp..............................      100        5,175
                                                                    -----------
Total Common Stocks
 (Cost $9,471,601).......................................            11,183,051
                                                                    -----------
CORPORATE BONDS & NOTES--25.3%
<CAPTION>
                                                          PRINCIPAL
                                                           AMOUNT
<S>                                                       <C>       <C>
Communications--15.4%
EchoStar DBS Corp.
 9.375%, due 2/01/09 (d)................................. $250,000  $   251,875
Level 3 Communications
 9.125%, due 5/01/08.....................................  300,000      285,750
</TABLE>

                                       6
<PAGE>

                          GREEN CENTURY BALANCED FUND
                     PORTFOLIO OF INVESTMENTS--(concluded)

                                 July 31, 1999
<TABLE>
<CAPTION>
                                                           PRINCIPAL
                                                            AMOUNT      VALUE
<S>                                                        <C>       <C>
Nextel Communications
 9.75%, due 8/15/04 (f)................................... $300,000  $   306,000
Nextel Communications
 0%, due 2/15/08 (f)......................................  400,000      282,000
PSINet Inc.
 11.50%, due 11/01/08.....................................  300,000      309,750
RCN Corp.
 0%, due 10/15/07 (f).....................................  300,000      200,250
RCN Corp.
 0%, due 2/15/08 (f)......................................  300,000      189,000
Verio Inc.
 11.25%, due 12/01/08 (d).................................  300,000      307,500
Winstar Communications, Inc.
 0%, due 10/15/05 (f).....................................  250,000      213,750
                                                                     -----------
                                                                       2,345,875
                                                                     -----------
Consumer Goods & Services--4.8%
Frank's Nursery & Crafts
 10.25%, due 3/01/08......................................  200,000      199,250
Kindercare Learning Centers
 9.50%, due 2/15/09.......................................  250,000      242,500
Nebraska Book Company
 8.75%, due 2/15/08.......................................  200,000      165,500
Nebraska Book Company
 0%, due 2/15/09..........................................  300,000      133,500
                                                                     -----------
                                                                         740,750
                                                                     -----------
Food & Beverage--2.7%
Homeland Stores, Inc.
 10.00%, due 8/01/03......................................  250,000      213,438
Sparkling Spring Water
 11.50%, due 11/15/07.....................................  250,000      201,250
                                                                     -----------
                                                                         414,688
                                                                     -----------
Energy--1.7%
Calpine Corp.
 8.75%, due 07/15/07......................................  250,000      255,625
                                                                     -----------
Environmental Services--0.7%
ICF Kaiser International
 13.00%, due 12/31/03.....................................  200,000      100,750
                                                                     -----------
Total Corporate Bonds and Notes (Cost $4,111,796).........             3,857,688
                                                                     -----------
</TABLE>
<TABLE>
<CAPTION>
                                                                        VALUE
<S>                                                                  <C>
SHORT-TERM OBLIGATIONS--1.0%
Repurchase Agreements
Salomon Brothers, 4.33%, dated 7/30/99, due 8/02/99, proceeds
 $159,364 (collateralized by U.S. Treasury securities with maturity
 at 8/15/2025, value $162,492) (cost $159,306).....................  $   159,306
                                                                     -----------
TOTAL INVESTMENTS (a)--99.5%
 (Cost $13,742,703)................................................   15,200,045
</TABLE>
<TABLE>
<S>                                                                  <C>
Other Assets Less
 Liabilities--0.5%..................................................      69,203
                                                                     -----------
NET ASSETS--100%.................................................... $15,269,248
                                                                     ===========
</TABLE>
- -------
(a) The cost of investments for federal income tax purposes is $13,742,703,
    resulting in gross unrealized appreciation and depreciation of $2,257,633
    and $800,291 respectively, or net unrealized appreciation of $1,457,342.
(b) Non-income producing security.
(c) Securities whose values are determined or significantly influenced by
    trading on exchanges not in the United States or Canada. ADR after the
    name of a foreign holding stands for American Depository Receipt
    representing foreign securities on deposit with a domestic custodian bank.
(d) Securities that may be resold to "qualified institutional buyers" under
    Rule 144a or securities offered pursuant to Section 4(2) of the Securities
    Act of 1933, as amended. These securities have been determined to be
    liquid under guidelines established by the Board of Trustees.
(e) Restricted Security. Purchased in a private placement transaction; resale
    to the public may require registration or sale only to qualified
    institutional buyers. Management has determined that its fair value at
    July 31, 1999 is equal to cost.
(f) Step bond. Rate shown is currently in effect at July 31, 1999.
(g) Represent rights to purchase shares in an Initial Public Offering; shares
    were subsequently purchased on 8/5/99 at a cost of $12.00 each.
(h) Represent rights to purchase shares in an Initial Public Offering; shares
    were subsequently purchased on 8/10/99 at a cost of $10.00 each.

                       See Notes to Financial Statements

                                       7
<PAGE>

                          GREEN CENTURY BALANCED FUND
                      STATEMENT OF ASSETS AND LIABILITIES

                                 July 31, 1999

<TABLE>
<S>                                                                  <C>
ASSETS:
Investments, at value (cost $13,742,703)...........................  $15,200,045
Receivables for:
 Securities sold...................................................      205,737
 Interest and dividends............................................      110,797
 Capital stock sold................................................       57,288
                                                                     -----------
 Total assets......................................................   15,573,867
                                                                     -----------
LIABILITIES:
Payable for securities purchased...................................      269,750
Accrued expenses...................................................       31,174
Payable for capital stock redeemed.................................        3,695
                                                                     -----------
 Total liabilities.................................................      304,619
                                                                     -----------
NET ASSETS.........................................................  $15,269,248
                                                                     ===========
NET ASSETS CONSIST OF:
Paid-in capital....................................................  $15,239,760
Accumulated net realized loss on investments and options written...   (1,433,166)
Net unrealized appreciation on investments.........................    1,457,342
Accumulated undistributed net investment income....................        5,312
                                                                     -----------
NET ASSETS.........................................................  $15,269,248
                                                                     ===========
SHARES OUTSTANDING.................................................    1,250,985
                                                                     ===========
NET ASSET VALUE, REDEMPTION PRICE AND OFFERING PRICE PER SHARE.....  $     12.21
                                                                     ===========

                          GREEN CENTURY BALANCED FUND
                            STATEMENT OF OPERATIONS

                        For the year ended July 31, 1999

INVESTMENT INCOME:
Interest income....................................................  $   464,992
Dividend income....................................................       18,928
Miscellaneous income...............................................        6,044
                                                                     -----------
 Total investment income...........................................      489,964
                                                                     -----------
EXPENSES (Note 2):
Administrative services fee........................................      209,905
Investment advisory fee............................................      104,953
Distribution fee...................................................       34,984
                                                                     -----------
 Total expenses....................................................      349,842
                                                                     -----------
NET INVESTMENT INCOME..............................................      140,122
                                                                     -----------
NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND OPTIONS
 WRITTEN (Note 1):
Net realized gain (loss) on:
 Investments.......................................................   (1,456,834)
 Options written...................................................       56,637
                                                                     -----------
                                                                      (1,400,197)
                                                                     -----------
Net increase (decrease) in net unrealized appreciation/depreciation
 of:
 Investments.......................................................    1,942,123
 Options written...................................................       (2,201)
                                                                     -----------
                                                                       1,939,922
                                                                     -----------
NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND OPTIONS
 WRITTEN...........................................................      539,725
                                                                     -----------
NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS....  $   679,847
                                                                     ===========
</TABLE>

                       See Notes to Financial Statements

                                       8
<PAGE>

                          GREEN CENTURY BALANCED FUND
                      STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                       FOR THE        FOR THE        FOR THE
                                     YEAR ENDED   ONE MONTH ENDED  YEAR ENDED
                                    JULY 31, 1999  JULY 31, 1998  JUNE 30, 1998
<S>                                 <C>           <C>             <C>
INCREASE (DECREASE) IN NET ASSETS:
From Operations:
 Net investment income.............  $   140,122    $     3,077    $    17,371
 Net realized gain (loss) on in-
  vestments and options written....   (1,400,197)       (32,969)     1,701,718
 Net increase (decrease) in
  unrealized net
  appreciation/depreciation of
  investments and options written..    1,939,922     (1,300,712)      (457,501)
                                     -----------    -----------    -----------
 Net increase (decrease) in net as-
  sets resulting from operations...      679,847     (1,330,604)     1,261,588
                                     -----------    -----------    -----------
Dividends and distributions to
 shareholders (Note 1):
 From net investment income........     (137,787)           --         (78,490)
 From net realized gains...........   (1,046,950)           --      (1,204,821)
                                     -----------    -----------    -----------
Total dividends and distributions..   (1,184,737)           --      (1,283,311)
                                     -----------    -----------    -----------
Capital share transactions (Note
 4):
 Proceeds from sales of shares.....    3,191,755        567,446      5,329,586
 Reinvestment of dividends and dis-
  tributions.......................      859,904            --       1,022,174
 Payments for shares redeemed......   (3,489,320)      (310,809)    (1,066,413)
                                     -----------    -----------    -----------
 Net increase in net assets result-
  ing from capital stock transac-
  tions............................      562,339        256,637      5,285,347
                                     -----------    -----------    -----------
Total Increase (Decrease) in Net
 Assets............................       57,449     (1,073,967)     5,263,624
NET ASSETS:
 Beginning of Period...............   15,211,799     16,285,766     11,022,142
                                     -----------    -----------    -----------
 End of Period (including undis-
  tributed net investment income of
  $5,312 and $3,077 for the year
  ended July 31, 1999, and the one
  month ended July 31, 1998, re-
  spectively)......................  $15,269,248    $15,211,799    $16,285,766
                                     ===========    ===========    ===========
</TABLE>

                          GREEN CENTURY BALANCED FUND
                              FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                           FOR THE
                             FOR THE      ONE MONTH
                           YEAR ENDED       ENDED         FOR THE YEARS ENDED JUNE 30,
                                                        --------------------------------
                          JULY 31, 1999 JULY 31, 1998    1998     1997     1996    1995
<S>                       <C>           <C>             <C>      <C>      <C>     <C>
Net Asset Value, begin-
 ning of period.........     $ 12.68       $ 13.79      $ 13.53  $ 13.34  $11.03  $ 9.68
                             -------       -------      -------  -------  ------  ------
Income from investment
 operations:
 Net investment income..        0.11           --          0.02     0.12    0.10    0.10
 Net realized and
  unrealized gain (loss)
  on investments........        0.40         (1.11)        1.68     1.77    2.31    1.35
                             -------       -------      -------  -------  ------  ------
Total increase (de-
 crease) from investment
 operations.............        0.51         (1.11)        1.70     1.89    2.41    1.45
                             -------       -------      -------  -------  ------  ------
Less dividends and dis-
 tributions (Note 1):
 Dividends from net in-
  vestment income.......       (0.11)          --         (0.09)   (0.10)  (0.10)  (0.10)
 Distributions from net
  realized gains........       (0.87)          --         (1.35)   (1.60)    --      --
                             -------       -------      -------  -------  ------  ------
Total decrease from div-
 idends and distribu-
 tions..................       (0.98)          --         (1.44)   (1.70)  (0.10)  (0.10)
                             -------       -------      -------  -------  ------  ------
Net Asset Value, end of
 period.................     $ 12.21       $ 12.68      $ 13.79  $ 13.53  $13.34  $11.03
                             =======       =======      =======  =======  ======  ======
Total return............        4.93%        (8.05)%(a)   13.13%   15.22%  21.98%  15.00%
Ratios\Supplemental da-
 ta:
 Net assets, end of pe-
  riod (in 000's).......     $15,269       $15,212      $16,286  $11,022  $8,215  $3,291
 Ratio of expenses to
  average net assets....        2.50%         2.50%(b)     2.50%    2.50%   2.50%   2.50%
 Ratio of net investment
  income to average net
  assets................        1.00%         0.22%(b)     0.12%    0.94%   0.85%   0.97%
 Portfolio turnover.....          91%            4%(a)       96%     109%    136%     16%
</TABLE>

(a) Not annualized
(b) Annualized

                       See Notes to Financial Statements

                                       9
<PAGE>

                           GREEN CENTURY EQUITY FUND
                      STATEMENT OF ASSETS AND LIABILITIES

                                 July 31, 1999

<TABLE>
<S>                                                                  <C>
ASSETS:
Investment in Domini Social Index Portfolio, at value (Note 1)...... $29,717,191
Receivable for capital stock sold...................................      78,996
                                                                     -----------
   Total assets.....................................................  29,796,187
                                                                     -----------
LIABILITIES:
Accrued expenses (Note 2)...........................................      32,347
                                                                     -----------
NET ASSETS.......................................................... $29,763,840
                                                                     ===========
NET ASSETS CONSIST OF:
Paid-in capital..................................................... $23,001,463
Accumulated net realized gain on investment.........................     174,365
Net unrealized appreciation on investment...........................   6,588,012
                                                                     -----------
NET ASSETS.......................................................... $29,763,840
                                                                     ===========
SHARES OUTSTANDING..................................................   1,208,833
                                                                     ===========
NET ASSET VALUE, REDEMPTION PRICE AND OFFERING PRICE PER SHARE...... $     24.62
                                                                     ===========
</TABLE>

                           GREEN CENTURY EQUITY FUND
                            STATEMENT OF OPERATIONS

                        For the year ended July 31, 1999

<TABLE>
<S>                                                                  <C>
INVESTMENT INCOME FROM INDEX PORTFOLIO:
Investment income from Index Portfolio.............................  $  225,879
Expenses from Index Portfolio......................................     (43,340)
                                                                     ----------
   Net income from Index Portfolio.................................     182,539
                                                                     ----------
EXPENSES:
Administrative services fee (Note 2)...............................     281,718
                                                                     ----------
NET INVESTMENT LOSS................................................     (99,179)
                                                                     ----------
NET REALIZED AND UNREALIZED GAIN ON INVESTMENT:
Net realized gain on investment allocated from Index Portfolio.....     369,045
Net increase in net unrealized appreciation of investment allocated
 from Index Portfolio..............................................   3,767,345
                                                                     ----------
NET REALIZED AND UNREALIZED GAIN ON INVESTMENT.....................   4,136,390
                                                                     ----------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS...............  $4,037,211
                                                                     ==========
</TABLE>

                       See Notes to Financial Statements

                                       10
<PAGE>

                           GREEN CENTURY EQUITY FUND
                      STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                       FOR THE       FOR THE
                                                     YEAR ENDED    YEAR ENDED
                                                    JULY 31, 1999 JULY 31, 1998
<S>                                                 <C>           <C>
INCREASE IN NET ASSETS:
From Operations:
 Net investment loss...............................  $   (99,179)  $   (24,397)
 Net realized gain on investment allocated from In-
  dex Portfolio....................................      369,045       101,835
 Net increase in net unrealized appreciation of in-
  vestment allocated from Index Portfolio..........    3,767,345     1,755,126
                                                     -----------   -----------
 Net increase in net assets resulting from opera-
  tions............................................    4,037,211     1,832,564
                                                     -----------   -----------
Dividends and distributions to shareholders:
 From net realized gains...........................     (179,708)       (5,456)
                                                     -----------   -----------
 Total dividends and distributions.................     (179,708)       (5,456)
                                                     -----------   -----------
Capital Share Transactions (Note 4):
 Proceeds from sales of shares.....................   13,046,220    10,106,426
 Reinvestment of dividends and distributions.......      174,395         5,171
 Payments for shares redeemed......................   (2,789,855)   (1,738,306)
                                                     -----------   -----------
 Net increase in net assets resulting from capital
  share transactions...............................   10,430,760     8,373,291
                                                     -----------   -----------
Total Increase in Net Assets.......................   14,288,263    10,200,399
NET ASSETS:
 Beginning of period...............................   15,475,577     5,275,178
                                                     -----------   -----------
 End of period (including accumulated net
  investment loss of $0 and $0 respectively).......  $29,763,840   $15,475,577
                                                     ===========   ===========
</TABLE>

                           GREEN CENTURY EQUITY FUND
                              FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                                               FOR THE PERIOD
                                                             SEPTEMBER 13, 1995
                                     FOR THE YEARS            (COMMENCEMENT OF
                                     ENDED JULY 31,            OPERATIONS) TO
                                 --------------------------    JULY 31, 1996
                                  1999      1998      1997
<S>                              <C>       <C>       <C>     <C>
Net Asset Value, beginning of
 period......................... $ 20.44   $ 16.86   $11.04        $10.00
                                 -------   -------   ------        ------
Income from investment opera-
 tions:
 Net investment income (loss)...   (0.08)    (0.03)    0.02          0.02
 Net realized and unrealized
  gain on investment............    4.47      3.62     5.84          1.04
                                 -------   -------   ------        ------
 Total increase from investment
  operations....................    4.39      3.59     5.86          1.06
                                 -------   -------   ------        ------
Less dividends and distribu-
 tions:
 Dividends from net investment
  income........................     --        --     (0.03)        (0.02)
 Distributions from net realized
  gains.........................   (0.21)    (0.01)   (0.01)          --
                                 -------   -------   ------        ------
Total decrease from dividends
 and distributions..............   (0.21)    (0.01)   (0.04)        (0.02)
                                 -------   -------   ------        ------
Net Asset Value, end of period.. $ 24.62   $ 20.44   $16.86        $11.04
                                 =======   =======   ======        ======
Total return....................   21.56%    21.32%   53.14%        10.64%(a)
Ratios/supplemental data
 Net Assets, end of period (in
  000's)........................ $29,764   $15,476   $5,275        $  880
 Ratio of expenses to average
  net assets....................    1.50%     1.50%    1.50%         1.50%(b)
 Ratio of net investment income
  (loss) to average net assets..   (0.46)%   (0.26)%   0.07%         0.49%(b)
 Portfolio turnover (c).........       8%        5%       1%          n/a
</TABLE>

(a) Not annualized.
(b) Annualized.
(c) Represents portfolio turnover for the Index Portfolio.

                       See Notes to Financial Statements

                                       11
<PAGE>

                          GREEN CENTURY BALANCED FUND
                           GREEN CENTURY EQUITY FUND
                         NOTES TO FINANCIAL STATEMENTS

NOTE 1--Organization and Significant Accounting Policies
  Green Century Funds (the "Trust") is a Massachusetts business trust which
offers two separate series, the Green Century Balanced Fund (the "Balanced
Fund") and the Green Century Equity Fund (the "Equity Fund"). The Trust is
registered under the Investment Company Act of 1940, as amended (the "Act"),
as an open-end management investment company. The Trust accounts separately
for the assets, liabilities and operations of each series. The Balanced Fund
commenced operations on March 18, 1992 and the Equity Fund commenced
operations on September 13, 1995.
  The Equity Fund invests substantially all of its assets in the Domini Social
Index Portfolio (the "Index Portfolio"), an open-end, diversified management
investment company having the same investment objective as the Fund. The
Equity Fund accounts for its investment in the Index Portfolio as a
partnership investment and records its share of the Index Portfolio's income,
expenses and realized and unrealized gains and losses daily. The value of such
investment reflects the Fund's proportionate interest in the net assets of the
Index Portfolio (2.21% at July 31, 1999). The financial statements of the
Index Portfolio are included elsewhere in this report and should be read in
conjunction with the Equity Fund's financial statements.
  The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates. The
following is a summary of the Trust's significant accounting policies:
  (A) Balanced Fund Investment Valuation: Equity securities listed on
      national securities exchanges or reported through the NASDAQ system are
      valued at last sale price. Unlisted securities or listed securities for
      which last sale prices are not available are valued at the mean between
      the closing bid and asked prices if such securities are listed on a
      national exchange, and at the last quoted bid price in the case of
      securities not listed on a national exchange. Debt securities (other
      than short-term obligations maturing in sixty days or less) are valued
      on the basis of valuation furnished by a pricing service which takes
      into account appropriate factors such as institution-size trading in
      similar groups of securities, yield, quality, coupon rate, maturity,
      type of issue, and other market data, without exclusive reliance on
      quoted prices or exchange or over-the-counter prices, since such
      valuations are believed to reflect more accurately the fair value of
      the securities. Securities, if any, for which there are no such
      valuations or quotations available are valued at fair value as
      determined in good faith under guidelines established by the Trustees.
      Short-term obligations maturing in sixty days or less are valued at
      amortized cost, which approximates market value.
    Equity Fund Investment Valuation: Valuation of securities by the Index
     Portfolio is discussed in Note 1 of the Index Portfolio's Notes to
     Financial Statements which are included elsewhere in this report.
  (B) Balanced Fund Securities Transactions and Investment Income: Securities
      transactions are recorded on a trade date basis. Realized gains and
      losses from securities transactions are determined using the identified
      cost basis. Interest income is recognized on the accrual basis and
      dividend income is recorded on ex-dividend date.
    Equity Fund Securities Transactions and Investment Income: The Fund earns
     income, net of Index Portfolio expenses, daily based on its investment
     in the Index Portfolio.

                                      12
<PAGE>

                          GREEN CENTURY BALANCED FUND
                           GREEN CENTURY EQUITY FUND
                  NOTES TO FINANCIAL STATEMENTS--(continued)

  (C) Distributions: Distributions to shareholders are recorded on the ex-
      dividend date. The Funds declare and pay dividends of net investment
      income, if any, semi-annually and distribute net realized capital
      gains, if any, annually. The amount and character of income and net
      realized gains to be distributed are determined in accordance with
      Federal income tax rules and regulations, which may differ from
      generally accepted accounting principles. These differences are
      attributable to permanent book and tax accounting differences.
      Accordingly, at July 31, 1999 for the Balanced Fund, a reclassification
      was recorded to decrease undistributed net investment income and to
      decrease undistributed net realized loss by $102. At July 31, 1999 for
      the Equity Fund, a reclassification was recorded to increase
      undistributed net investment income and decrease undistributed net
      realized gain by $99,179.
  (D) Balanced Fund Options Written: When the Balanced Fund writes a call
      option or a put option, an amount equal to the premium received by the
      Fund is recorded as a liability, the value of which is marked-to-market
      daily. When a written option expires, the Balanced Fund realizes a gain
      equal to the amount of the premium originally received. When the
      Balanced Fund enters into a closing purchase transaction, the Fund
      realizes a gain (or loss if the cost of the closing purchase
      transaction exceeds the premium originally received when the option was
      written) without regard to any unrealized gain or loss on the
      underlying security, and the liability related to such option is
      eliminated. When a call option is exercised, the Fund realizes a gain
      or loss from the sale of the underlying security and the proceeds from
      such sale are increased by the premium originally received. When a put
      option is exercised, the amount of the premium originally received will
      reduce the cost of the security which the Fund purchased upon exercise.
       The risk in writing a call option is that the Balanced Fund may forego
     the opportunity for profit if the market price of the underlying
     security increases and the option is exercised. The risk in writing a
     put option is that the Fund may incur a loss if the market price of the
     underlying security decreases and the option is exercised. There is also
     the risk the Fund may not be able to enter into a closing transaction
     because of an illiquid secondary market. In addition, the Fund could be
     exposed to risks if the counterparties to the transaction are unable to
     meet the terms of the contracts.
  (E) Federal Taxes: Each series of the Trust is treated as a separate entity
      for Federal income tax purposes. Each Fund's policy is to comply with
      the provisions of the Internal Revenue Code applicable to regulated
      investment companies. Accordingly, no provisions for Federal income or
      excise tax are necessary.

NOTE 2--Transactions With Affiliates
  (A) Investment Adviser: Green Century Capital Management, Inc. ("Green
      Century") is the adviser ("the Adviser") for the Balanced Fund and
      oversees the portfolio management of the Balanced Fund on a day-to-day
      basis. For these services, Green Century receives a fee, accrued daily
      and paid monthly, at an annual rate equal to 0.75% of the Balanced
      Fund's average daily net assets.
  (B) Subadviser: Winslow Management Company ("Winslow"), a separate
      operating division of Adams, Harkness & Hill, Inc., is the subadviser
      for the Balanced Fund. Prior to March 31, 1999, Winslow was a division
      of Eaton Vance Management. For its services, Winslow is paid a fee by
      the Adviser at an annual rate equal to 0.40% of the average daily net
      assets of the Balanced Fund, subject to an adjustment up or down of
      0.20% annually. For the year ended July 31, 1999 Green Century accrued
      fees of $26,938 to Winslow.

                                      13
<PAGE>

                          GREEN CENTURY BALANCED FUND
                           GREEN CENTURY EQUITY FUND
                  NOTES TO FINANCIAL STATEMENTS--(continued)

  (C) Administrator: Green Century is the administrator ("the Administrator")
      of the Green Century Funds. Pursuant to the Administrative Services
      Agreement, Green Century pays all the expenses of each Fund other than
      the investment advisory fees, fees under the Distribution Plan,
      interest, taxes, brokerage costs and other capital expenses, expenses
      of non-interested trustees (including counsel fees) and any
      extraordinary expenses. For these services, Green Century receives a
      fee from the Balanced Fund at an annual rate equal to 1.50% of the
      Fund's average daily net assets, and receives a fee from the Equity
      Fund at a rate such that immediately following any payment to the
      Administrator, the combined total operating expenses of the Fund and
      the Index Portfolio (including investment advisory and distribution
      fees and any amortization of organization expenses), on an annual
      basis, do not exceed 1.50% of the Fund's average daily net assets.
  (D) Subadministrator: Pursuant to a Subadministrative Services Agreement
      with the Administrator, Sunstone Financial Group, Inc. ("Sunstone"), as
      Subadministrator, is responsible for conducting certain day-to-day
      administration of the Trust subject to the supervision and direction of
      the Administrator. For the year ended July 31, 1999, Green Century
      accrued fees of $40,685 and $40,685 to Sunstone related to services
      performed on behalf of the Balanced Fund and the Equity Fund,
      respectively.
  (E) Distribution Plan: The Trust has adopted a Distribution Plan (the
      "Plan") with respect to the Balanced Fund in accordance with Rule 12b-1
      under the Act. The Plan provides that the Balanced Fund pay a fee to
      Sunstone Distribution Services, LLC, as distributor of shares of the
      Balanced Fund, at an annual rate not to exceed 0.25% of the Balanced
      Fund's average daily net assets. The fee is reimbursement for, or in
      anticipation of, expenses incurred for distribution-related activities.
      For the year ended July 31, 1999, the Balanced Fund accrued and paid
      $35,090 to Sunstone Distribution Services, LLC for services provided
      pursuant to the plan.

NOTE 3--Investment Transactions
  The Balanced Fund's purchases and sales of securities, other than short-term
securities, aggregated $12,675,977 and $12,195,865, respectively, for the year
ended July 31, 1999.
  The Balanced Fund's activity in written options for the year ended July 31,
1999 was as follows:

<TABLE>
<CAPTION>
                                                             PREMIUM   CONTRACTS
<S>                                                          <C>       <C>
Options outstanding at July 31, 1998........................ $  6,664      34
Options written.............................................   69,629     554
Options expired.............................................  (46,502)   (354)
Options closed..............................................  (29,791)   (234)
                                                             --------    ----
Options outstanding at July 31, 1999........................ $      0       0
                                                             ========    ====
</TABLE>

  Additions and reductions in the Equity Fund's investment in the Index
Portfolio aggregated $13,100,902 and $2,779,346 for the year ended July 31,
1999.

                                      14
<PAGE>

                          GREEN CENTURY BALANCED FUND
                           GREEN CENTURY EQUITY FUND
                  NOTES TO FINANCIAL STATEMENTS--(concluded)


NOTE 4--Capital Share Transactions
  Capital share transactions for the Balanced Fund and the Equity Fund were as
follows:

<TABLE>
<CAPTION>
                                       BALANCED FUND                     EQUITY FUND
                         ----------------------------------------- ------------------------
                                                                                  FOR THE
                            FOR THE     FOR THE ONE     FOR THE       FOR THE    YEAR ENDED
                          YEAR ENDED    MONTH ENDED   YEAR ENDED    YEAR ENDED      JULY
                         JULY 31, 1999 JULY 31, 1998 JUNE 30, 1998 JULY 31, 1999  31, 1998
<S>                      <C>           <C>           <C>           <C>           <C>
Shares sold.............    284,115        41,766       360,830       572,365     535,842
Reinvestment of divi-
 dends..................     77,885             0        78,147         7,585         307
Shares redeemed.........   (310,445)      (22,956)      (72,916)     (128,076)    (92,049)
                           --------       -------       -------      --------     -------
                             51,555        18,810       366,061       451,874     444,100
                           ========       =======       =======      ========     =======
</TABLE>

NOTE 5--Results of the Shareholder Meeting (Unaudited)
  The special meeting of the shareholders of the Balanced Fund was held on
June 18, 1999. The matter voted on by the shareholders of record as of May 3,
1999 and the results of the vote at the shareholder meeting was as follows:

  1. To approve a new investment subadvisory agreement between Winslow
     Management Company, Green Century Capital Management, Inc. and the Trust
     on behalf of the Fund,

<TABLE>
<CAPTION>
             For                         Against                                           Abstain
             ---                         -------                                           -------
           <S>                           <C>                                               <C>
           790,107                       11,861                                            27,396
</TABLE>

- -------------------------------------------------------------------------------

TAX INFORMATION--UNAUDITED

  The federal tax status of distributions per share made to shareholders on
December 29, 1998 was as follows:

<TABLE>
<CAPTION>
                                             NET                        20%
                                          INVESTMENT  SHORT-TERM     LONG-TERM
                                            INCOME   CAPITAL GAINS CAPITAL GAINS
                                          ---------- ------------- -------------
<S>                                       <C>        <C>           <C>
Balanced Fund............................  $0.0026      $0.1878       $0.6777
Equity Fund..............................     NONE         NONE       $0.2098
</TABLE>

  For the Balanced Fund for the year ended July 31, 1999, 5.2% of dividends
paid from net investment income and short-term capital gains qualified for the
70% dividends received deduction available to corporate shareholders.
  For the year ended July 31, 1999, the Equity Fund did not pay any dividends
from net investment income or short-term capital gains that would qualify for
the 70% dividends received deduction available to corporate shareholders.
  As of July 31, 1999, the Balanced Fund had a capital loss carryover for
federal income tax purposes of $631,500, of which $32,969 expires in 2006 and
$598,531 expires in 2007.

                                      15
<PAGE>

                          [LOGO OF KPMG APPEARS HERE]

                         INDEPENDENT AUDITORS' REPORT

The Board of Trustees and Shareholders
Green Century Funds

  We have audited the accompanying statement of assets and liabilities,
including the portfolio of investments, of the Green Century Balanced Fund
(the "Fund") as of July 31, 1999, the related statement of operations for the
year then ended, the statements of changes in net assets for the year then
ended and for one-month period ended July 31, 1998 and the year ended June 30,
1998, and financial highlights for each of the five fiscal periods ended July
31, 1999. These financial statements and financial highlights are the
responsibility of the Fund's management. Our responsibility is to express an
opinion on these financial statements and financial highlights based on our
audits.
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements and
financial highlights are free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and disclosures in
the financial statements. Our procedures included confirmation of securities
owned as of July 31, 1999 by correspondence with the custodian and brokers. An
audit also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.
  In our opinion, the financial statements and financial highlights referred
to above present fairly, in all material respects, the financial position of
the Green Century Balanced Fund as of July 31, 1999, the results of its
operations, changes in its net assets and financial highlights for the years
or periods described above, in conformity with generally accepted accounting
principles.

                                                [LOGO OF KPMG LLP APPEARS HERE]

Boston, Massachusetts
September 16, 1999

                                      16
<PAGE>

[LOGO OF KPMG APPEARS HERE]

                         INDEPENDENT AUDITORS' REPORT

The Board of Trustees and Shareholders
Green Century Funds

  We have audited the accompanying statement of assets and liabilities of the
Green Century Equity Fund (the "Fund") as of July 31, 1999, and the related
statement of operations for the year then ended, and statements of changes in
net assets for each of the years in the two-year period then ended, and the
financial highlights for each of the years in the three-year period then
ended, and for the period from September 13, 1995 (commencement of operations)
to July 31, 1996. These financial statements and financial highlights are the
responsibility of the Fund's management. Our responsibility is to express an
opinion on these financial statements and financial highlights based on our
audits.
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements and
financial highlights are free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and disclosures in
the financial statements. An audit also includes assessing the accounting
principles used and significant estimates made by management, as well as
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.
  In our opinion, the financial statements and financial highlights referred
to above present fairly, in all material respects, the financial position of
the Green Century Equity Fund as of July 31, 1999, the results of its
operations, changes in its net assets and financial highlights for each of the
years or periods referred to above in conformity with generally accepted
accounting principles.

                                                [LOGO OF KPMG LLP APPEARS HERE]


Boston, Massachusetts
September 16, 1999

                                      17
<PAGE>

                         DOMINI SOCIAL INDEX PORTFOLIO
                            PORTFOLIO OF INVESTMENTS

                                 July 31, 1999

<TABLE>
<CAPTION>
                                                           SHARES     VALUE
<S>                                                        <C>     <C>

Basic Materials--1.3%
Air Products & Chemicals, Inc. ...........................  52,300 $  1,748,781
Alcoa, Inc. ..............................................  84,600    5,065,425
Battle Mountain Gold Company (b)..........................  48,100       93,194
Bemis Company, Inc. ......................................  12,000      444,000
Cabot Corporation.........................................  14,600      350,400
Calgon Carbon Corporation.................................   8,100       54,675
Caraustar Industries, Inc. ...............................   5,200      129,350
Catalytica, Incorporated (b)..............................   5,800       72,500
Consolidated Papers, Inc. ................................  20,700      589,950
Cyprus Amax Minerals Company..............................  19,700      258,563
Echo Bay Mines Ltd. (b)...................................  25,000       32,811
Ecolab Inc. ..............................................  29,700    1,265,963
Fuller (H.B.) Company.....................................   3,100      215,450
IMCO Recycling Inc. ......................................   3,100       54,056
Mead Corporation..........................................  22,900      938,900
Minerals Technologies Inc. ...............................   4,800      257,400
Nalco Chemical Company....................................  15,100      776,706
Nucor Corporation.........................................  19,950      967,575
Praxair, Inc. ............................................  35,800    1,651,275
Ryerson Tull, Inc. .......................................   6,400      136,800
Sigma-Aldrich Corporation.................................  23,100      776,738
Sonoco Products Company...................................  23,345      625,938
Westvaco Corporation......................................  22,900      674,119
Worthington Industries, Inc. .............................  20,400      298,350
                                                                   ------------
                                                                     17,478,919
                                                                   ------------
Business & Professional Services--0.1%
Avery Dennison Corporation................................  26,000    1,595,750
Dionex Corporation (b)....................................   4,900      211,619
Isco, Inc. (b)............................................     800        4,750
Wellman, Inc. ............................................   7,000      113,312
                                                                   ------------
                                                                      1,925,431
                                                                   ------------
Capital Goods--2.0%
Baldor Electric Company...................................   7,500      136,406
Case Corporation..........................................  17,000      809,625
Cooper Industries, Inc. ..................................  21,300    1,168,836
Cross (A.T.) Company (b)..................................   2,300       11,500
Crown Cork & Seal Company, Inc. ..........................  28,000      820,750
Cummins Engine Company, Inc. .............................   9,700      627,469
Deere & Company...........................................  53,000    2,027,250
Emerson Electric Co. .....................................  99,600    5,944,875
Graco Inc. ...............................................   4,675      144,341
Granite Construction Incorporated.........................   6,050      153,141
HON Industries, Inc. .....................................  13,600      316,200
</TABLE>
<TABLE>
<CAPTION>
                                                           SHARES     VALUE
<S>                                                        <C>     <C>

Capital Goods--(continued)
Hubbell Incorporated......................................  14,460 $    596,475
Hunt Corporation..........................................   1,600       14,200
Illinois Tool Works Inc. .................................  57,100    4,243,244
Ionics, Inc. (b)..........................................   3,400      115,175
Lawson Products, Inc. ....................................   2,300       54,625
Leggett & Platt, Inc. ....................................  45,000    1,153,125
Milacron Inc. ............................................   7,800      133,575
Herman Miller, Inc. ......................................  17,800      467,250
Molex Incorporated........................................  35,137    1,227,599
Moore Corporation.........................................  19,400      161,263
National Service Industries, Inc. ........................   9,000      317,810
New England Business Service, Inc. .......................   2,900       83,194
Pitney Bowes Inc. ........................................  61,500    3,912,938
Raychem Corporation.......................................  17,700      674,813
Smith (A.O.) Corporation..................................   4,900      142,713
Standard Register Company.................................   6,200      180,188
Thomas & Betts Corporation................................  12,600      570,150
Thomas Industries Inc. ...................................   3,300       69,094
                                                                   ------------
                                                                     26,277,824
                                                                   ------------
Consumer Cyclicals--12.0%
American Greetings Corporation............................  15,000      440,625
Angelica Corporation......................................   1,300       16,656
Apogee Enterprises, Inc. .................................   5,600       55,300
AutoZone, Inc. (b)........................................  34,200      844,312
Bandag, Incorporated......................................   4,900      164,456
Banta Corporation.........................................   6,050      148,981
Bassett Furniture Industries..............................   2,400       59,400
Black & Decker Corporation................................  19,900    1,149,225
Block (H&R), Inc. ........................................  22,100    1,207,212
Brown Shoe Company, Inc. .................................   3,800       75,762
Centex Corporation........................................  13,600      458,150
Champion Enterprises, Inc. (b)............................  10,600      145,087
Charming Shoppes, Inc. (b)................................  20,500      137,094
Circuit City Stores, Inc. ................................  45,800    2,164,050
Cintas Corporation........................................  25,200    1,615,950
Claire's Stores, Inc. ....................................  11,100      263,625
Cooper Tire and Rubber Company............................  16,600      373,500
Costco Companies Inc. (b).................................  50,115    3,746,096
Dana Corporation..........................................  37,600    1,569,800
Dayton Hudson Corporation................................. 101,300    6,552,844
Delphi Automotive Systems Corporation..................... 128,700    2,316,600
DeVry Inc. (b)............................................  15,200      315,400
Dillard, Inc. ............................................  24,500      754,906
Dollar General Corporation................................  50,201    1,327,189
</TABLE>

                                       18
<PAGE>

                     PORTFOLIO OF INVESTMENTS--(continued)

                                 July 31, 1999

<TABLE>
<CAPTION>
                                                           SHARES     VALUE
<S>                                                        <C>     <C>

Consumer Cyclicals--(continued)
Dow Jones & Company.......................................  20,700 $  1,032,412
Egghead.com, Inc. (b).....................................   6,800       59,075
Enesco Group, Inc. .......................................   3,400       72,675
Fedders Corporation.......................................   6,400       42,000
Federal-Mogul Corporation.................................  16,100      780,850
Fleetwood Enterprises, Inc. ..............................   7,700      177,581
Gap, Inc. (The)........................................... 196,687    9,195,117
Genuine Parts Company.....................................  40,600    1,261,137
Gibson Greetings, Inc. (b)................................   2,300       11,500
Handleman Company (b).....................................   6,600       73,837
Harcourt General..........................................  16,300      756,931
Harland (John H.) Company.................................   6,500      130,812
Harman International Industries, Inc. ....................   3,930      172,920
Hartmarx Corporation (b)..................................   5,500       24,063
Hasbro, Inc. .............................................  44,725    1,162,850
Hillenbrand Industries, Inc. .............................  14,800      665,075
Home Depot, Inc. ......................................... 339,098   21,638,691
Huffy Corporation.........................................   2,500       28,125
IMS Health Incorporated...................................  72,300    2,015,363
Interface, Inc. ..........................................  11,000       98,313
Jostens, Inc. ............................................   7,400      149,850
Kmart Corporation (b)..................................... 112,900    1,637,050
Kaufman & Broad Home Corporation..........................  10,500      218,531
Kelly Services, Inc. .....................................   7,975      245,730
Lands' End, Inc. (b)......................................   6,700      303,594
Lee Enterprises, Inc. ....................................   9,700      295,244
Lillian Vernon Corporation................................   1,500       21,375
Limited, Inc. (The).......................................  49,600    2,266,100
Liz Claiborne, Inc. ......................................  14,000      543,375
Lowe's Companies, Inc. ...................................  84,700    4,467,925
Marriott International, Inc. .............................  56,900    1,995,056
Mattel, Inc. .............................................  95,085    2,234,498
May Department Stores Company.............................  77,300    2,990,544
Maytag Corporation........................................  20,200    1,406,425
McGraw-Hill Companies, Inc. ..............................  45,100    2,294,463
Media General, Inc. ......................................   5,900      300,163
Men's Wearhouse, Inc. (b).................................   8,800      218,900
Meredith Corporation......................................  11,900      427,656
Modine Manufacturing Company..............................   6,500      208,203
New York Times Company....................................  40,100    1,576,431
Nordstrom, Inc. ..........................................  32,000    1,006,000
Omnicom Group Inc. .......................................  40,800    2,891,700
Oshkosh B'Gosh, Inc. .....................................   3,800       64,600
Penney (J.C.) Company, Inc. ..............................  60,100    2,629,375
Pep Boys--Manny, Moe & Jack...............................  11,700      194,513
</TABLE>
<TABLE>
<CAPTION>
                                                          SHARES      VALUE
<S>                                                      <C>       <C>


Consumer Cyclicals--(continued)
Phillips-Van Heusen Corporation.........................     5,700 $     48,450
Reebok International Ltd. (b)...........................    12,300      149,138
Rouse Company (The).....................................    15,800      384,138
Russell Corporation.....................................     7,300      140,069
SPX Corporation (b).....................................     6,915      587,775
Scholastic Corporation (b)..............................     3,600      160,650
Sears, Roebuck and Co. .................................    86,800    3,515,400
Service Corporation International.......................    62,300      989,013
Shaw Industries, Inc. (b)...............................    32,300      680,319
Sherwin-Williams Company (The)..........................    38,300    1,034,100
Skyline Corporation.....................................     1,900       57,594
Snap-on Incorporated....................................    15,050      526,750
Springs Industries, Inc. ...............................     4,000      159,000
Stanley Works (The).....................................    20,300      567,131
Staples, Inc. (b).......................................   106,100    3,063,638
Stride Rite Corporation.................................     9,700       88,513
TJ International, Inc. .................................     3,300      102,300
TJX Companies, Inc. ....................................    73,300    2,423,481
Tandy Corporation.......................................    44,100    2,262,881
Tennant Company.........................................     1,700       58,225
Timberland Company (The) (b)............................     2,400      195,150
Times Mirror Company....................................    16,500      994,125
Toro Company............................................     2,700       95,850
Toys 'R' Us, Inc. (b)...................................    55,920      908,700
VF Corporation..........................................    27,000    1,066,500
Venator Group, Inc. (b).................................    30,100      316,050
Wal-Mart Stores, Inc. .................................. 1,018,600   43,035,850
Washington Post Company.................................     2,300    1,299,500
Whirlpool Corporation...................................    17,200    1,233,025
                                                                   ------------
                                                                    162,032,163
                                                                   ------------
Consumer Staples--15.8%
Alberto-Culver Company..................................    12,500      319,531
Albertson's, Inc. ......................................    95,900    4,765,031
Avon Products, Inc. ....................................    59,600    2,711,800
Ben & Jerry's Homemade, Inc. (b)........................     1,200       25,200
Bergen Brunswig Corporation.............................    30,736      491,776
Bestfoods...............................................    63,800    3,110,250
Bob Evans Farms, Inc. ..................................     9,000      190,407
CVS Corporation.........................................    89,500    4,452,625
Campbell Soup Company...................................    99,500    4,378,000
Church & Dwight Co., Inc. ..............................     4,300      188,931
Clorox Company..........................................    26,900    3,012,800
Coca-Cola Company.......................................   564,800   34,064,500
Colgate-Palmolive Company...............................   133,800    6,606,375
Comcast Corporation.....................................   169,500    6,525,750
</TABLE>

                                       19
<PAGE>

                     PORTFOLIO OF INVESTMENTS--(continued)

                                 July 31, 1999

<TABLE>
<CAPTION>
                                                           SHARES     VALUE
<S>                                                        <C>     <C>


Consumer Staples--(continued)
Darden Restaurants, Inc. .................................  29,800 $    650,012
Deluxe Corporation........................................  17,900      671,250
Disney, Walt Company (The) (b)............................ 471,300   13,019,662
Donnelley (R.R.) & Sons Company...........................  29,500    1,032,500
Fleming Companies, Inc. ..................................   8,000       96,500
Fort James Corporation....................................  50,400    1,839,600
General Mills Incorporated................................  34,800    2,881,875
Gillette Company.......................................... 253,900   11,123,994
Great Atlantic & Pacific Tea Company, Inc. ...............   8,500      293,781
Hannaford Bros. Co. ......................................   9,700      554,719
Heinz (H.J.) Company......................................  82,000    3,864,250
Hershey Foods Corporation.................................  31,900    1,850,200
Kellogg Company...........................................  92,400    3,216,675
Kimberly-Clark Corporation................................ 121,864    7,433,704
King World Productions, Inc. (b)..........................  16,200      564,975
Kroger Co. (b)............................................ 189,100    4,975,694
Longs Drug Stores Corporation.............................   8,600      296,162
Luby's, Inc. .............................................   4,600       68,137
McDonald's Corporation.................................... 310,800   12,956,475
MediaOne Group, Inc. (b).................................. 138,600   10,031,175
Nature's Sunshine Products, Inc. .........................   3,800       35,625
Newell Rubbermaid Inc. ...................................  64,378    2,784,348
Odwalla, Inc. (b).........................................     500        3,500
Oneida Ltd. ..............................................   3,500       91,000
PepsiCo, Inc. ............................................ 338,100   13,228,162
Procter & Gamble Company.................................. 304,100   27,521,050
Quaker Oats Company.......................................  30,800    2,096,325
Ralston Purina Company....................................  74,200    2,221,362
Ruby Tuesday, Inc. .......................................   6,600      138,600
Ryan's Family Steakhouse, Inc. (b)........................   8,400       89,775
Smucker (J.M.) Company....................................   6,500      157,219
Starbucks Corporation (b).................................  40,900      950,925
SUPERVALU Inc. ...........................................  27,300      621,075
SYSCO Corporation.........................................  75,400    2,464,638
TCBY Enterprises, Inc. ...................................   4,100       23,063
Tootsie Roll Industries, Inc. ............................   7,420      256,918
Tupperware Corporation....................................  12,600      297,675
Viacom, Inc. (b)..........................................  32,100    1,346,194
Walgreen Company.......................................... 229,200    6,489,225
Wendy's International, Inc. ..............................  28,200      819,563
Whitman Corporation.......................................  20,400      388,875
Whole Foods Market, Inc. (b)..............................   5,700      250,800
Wild Oats Markets, Inc. (b)...............................   2,700       98,213
Wrigley (Wm.) Jr. Company.................................  26,500    2,111,719
                                                                   ------------
                                                                    212,750,165
                                                                   ------------
</TABLE>
<TABLE>
<CAPTION>
                                                           SHARES     VALUE
<S>                                                        <C>     <C>


Financial Services--15.8%
Aetna, Inc. ..............................................  32,170 $  2,637,940
American Express Company.................................. 103,100   13,583,425
American General Corporation..............................  57,462    4,446,122
American International Group, Inc. ....................... 283,550   32,927,244
Bank One Corporation...................................... 270,285   14,747,425
BankBoston Corporation....................................  67,700    3,177,669
CIGNA Corporation.........................................  46,600    4,109,537
Capital One Financial Corporation.........................  45,000    2,086,875
Chittenden Corporation....................................   6,061      168,950
Chubb Corporation.........................................  40,300    2,410,444
Cincinnati Financial Corporation..........................  37,385    1,406,611
Dime Bancorp, Inc. .......................................  24,800      499,100
Edwards (A.G.), Inc. .....................................  20,987      579,765
Freddie Mac............................................... 159,100    9,128,362
Fannie Mae................................................ 234,600   16,187,400
Fifth Third Bancorp.......................................  61,525    4,002,970
First Tennessee National Corporation......................  29,400    1,076,775
Firstar Corporation....................................... 152,000    3,961,500
FirstFed Financial Corp. (b)..............................   4,000       64,000
Golden West Financial.....................................  12,700    1,218,406
HSB Group, Inc. ..........................................   6,350      258,365
Household International, Inc. ............................ 109,346    4,695,044
Jefferson-Pilot Corporation...............................  24,050    1,757,153
Lincoln National Corporation..............................  45,700    2,285,000
MBIA Inc. ................................................  22,700    1,299,575
MBNA Corporation.......................................... 182,950    5,214,075
MGIC Investment Corporation...............................  24,800    1,222,950
Marsh & McLennan Companies, Inc. .........................  60,050    4,563,800
Mellon Bank Corporation................................... 118,900    4,012,875
Merrill Lynch & Co., Inc. ................................  84,200    5,730,863
Morgan (J.P.) & Co. Incorporated..........................  40,600    5,191,725
PNC Bank Corp. ...........................................  69,300    3,664,238
Providian Financial Corporation...........................  32,600    2,966,600
ReliaStar Financial Corp. ................................  20,300      921,113
SLM Holding Corporation...................................  37,300    1,697,150
SAFECO Corporation........................................  31,200    1,187,550
St. Paul Companies, Inc. (The)............................  51,564    1,604,930
Schwab (Charles) Corporation.............................. 186,900    8,235,281
SunTrust Banks, Inc. .....................................  73,600    4,747,200
Synovus Financial Corp. ..................................  62,050    1,136,291
Torchmark Corporation.....................................  30,100      989,538
U.S. Bancorp.............................................. 165,900    5,163,638
UnumProvident Corp. ......................................  54,500    2,820,375
Value Line, Inc. .........................................   2,100       83,738
</TABLE>

                                       20
<PAGE>

                     PORTFOLIO OF INVESTMENTS--(continued)

                                 July 31, 1999

<TABLE>
<CAPTION>
                                                           SHARES     VALUE
<S>                                                        <C>     <C>


Financial Services--(continued)
Wachovia Corporation......................................  46,200 $  3,606,488
Washington Mutual, Inc. .................................. 135,702    4,656,275
Wells Fargo & Company..................................... 378,300   14,753,700
Wesco Financial Corporation...............................   1,600      491,200
                                                                   ------------
                                                                    213,377,250
                                                                   ------------
Healthcare--8.2%
Acuson Corporation........................................   5,800      101,137
ADAC Laboratories (b).....................................   3,600       25,425
Allergan, Inc. ...........................................  15,100    1,426,950
ALZA Corporation (b)......................................  23,100    1,123,237
Becton Dickinson and Company..............................  56,600    1,552,962
Biomet, Inc. .............................................  25,700      934,838
Boston Scientific Corporation (b).........................  90,200    3,658,738
Forest Laboratories, Inc. (b).............................  18,900      968,625
Guidant Corporation (b)...................................  69,200    4,052,525
Humana Inc. (b)...........................................  38,400      417,600
Johnson & Johnson......................................... 307,900   28,365,288
Mallinckrodt Inc..........................................  16,300      552,163
McKesson HBOC, Inc. ......................................  63,220    1,963,771
Medtronic, Inc. .......................................... 133,700    9,634,756
Merck & Co., Inc. ........................................ 540,300   36,571,556
Mylan Laboratories, Inc. .................................  28,700      652,925
Oxford Health Plans, Inc. (b).............................  17,800      318,175
St. Jude Medical, Inc. (b)................................  19,300      717,719
Schering-Plough Corporation............................... 336,900   16,508,100
Stryker Corporation (b)...................................  22,000    1,342,000
Sunrise Medical Inc. (b)..................................   3,500       23,188
United American Healthcare Corporation (b)................     800        1,000
                                                                   ------------
                                                                    110,912,678
                                                                   ------------
Industrial, Construction & Housing--0.6%
American Power Conversion (b).............................  43,200      896,400
Ault Incorporated (b).....................................     500        2,750
Brady Corporation.........................................   4,700      164,500
CLARCOR Inc. .............................................   5,250      103,358
Fastenal Company..........................................   8,700      514,388
Hutchinson Technology Incorporated (b)....................   5,100      134,194
Merix Corporation (b).....................................     600        4,725
Millipore Corporation.....................................  10,100      411,575
Nordson Corporation.......................................   3,700      212,750
Osmonics, Inc. (b)........................................   2,100       21,263
Sealed Air Corporation (b)................................  19,100    1,227,175
Solectron Corporation (b).................................  57,500    3,705,156
Spartan Motors, Inc. .....................................   1,700       10,625
Watts Industries, Inc. ...................................   5,600      100,100
                                                                   ------------
                                                                      7,508,959
                                                                   ------------
</TABLE>
<TABLE>
<CAPTION>
                                                          SHARES      VALUE
<S>                                                      <C>       <C>


Natural Resources--0.8%
Anadarko Petroleum Corporation..........................    27,200 $  1,038,700
Apache Corporation......................................    25,200    1,069,425
Atlantic Richfield Company..............................    73,700    6,637,606
Helmerich & Payne, Inc. ................................    11,000      281,188
PennzEnergy Company.....................................    10,700      175,881
Rowan Companies, Inc. (b)...............................    18,500      348,031
Santa Fe Snyder Corporation (b).........................    37,100      343,175
Sunoco, Inc. ...........................................    20,700      631,350
                                                                   ------------
                                                                     10,525,356
                                                                   ------------
Printing, Publishing & Telecommunications--3.8%
AT&T Corp. .............................................   728,377   37,830,081
Citizens Utilities Company (b)..........................    59,467      706,171
Frontier Corporation....................................    39,500    2,189,781
Sprint Corporation......................................   198,000   10,234,125
                                                                   ------------
                                                                     50,960,158
                                                                   ------------
Technology--29.6%
Adaptec, Inc. (b).......................................    23,600      917,450
Advanced Micro Devices, Inc. (b)........................    32,600      560,313
Analog Devices, Inc. (b)................................    36,600    1,578,375
Apple Computer, Inc. (b)................................    36,300    2,021,456
Applied Materials, Inc. (b).............................    85,400    6,143,462
Arrow Electronics, Inc. (b).............................    21,000      447,562
Autodesk, Inc. .........................................    13,100      347,150
Automatic Data Processing, Inc. ........................   141,574    5,671,808
Avnet, Inc. ............................................     7,700      377,300
BMC Software, Inc. (b)..................................    53,700    2,893,087
CPI Corp. ..............................................     2,000       67,375
Ceridian Corporation (b)................................    32,500      910,000
Cisco Systems, Inc. (b).................................   731,100   45,419,587
Compaq Computer Corporation.............................   389,088    9,338,112
Computer Associates International, Inc. ................   122,800    5,633,450
Compuware Corporation (b)...............................    83,800    2,325,450
Dell Computer Corporation (b)...........................   580,500   23,727,937
EMC Corporation (b).....................................   231,700   14,032,331
Gerber Scientific Inc. .................................     4,700      113,094
Grainger (W.W.), Inc. ..................................    21,300    1,006,425
Hewlett-Packard Company.................................   232,300   24,318,906
Ikon Office Solutions, Inc. ............................    33,100      436,506
Inprise Corporation (b).................................    10,400       45,826
Intel Corporation.......................................   759,400   52,398,600
LSI Logic Corporation (b)...............................    32,700    1,645,218
Lucent Technologies, Inc. ..............................   695,800   45,270,487
Microsoft Corporation................................... 1,168,200  100,246,163
</TABLE>

                                       21
<PAGE>

                     PORTFOLIO OF INVESTMENTS--(concluded)

                                 July 31, 1999

<TABLE>
<CAPTION>
                                                           SHARES     VALUE
<S>                                                        <C>     <C>


Technology--(continued)
Micron Technology, Inc. (b)...............................  57,100 $  3,547,338
National Semiconductor Corporation (b)....................  37,900      938,025
Novell, Inc. (b)..........................................  76,600    1,972,450
PE Corp-PE Biosystems Group (b)...........................   5,650      149,725
PeopleSoft, Inc. (b)......................................  55,100      750,738
Polaroid Corporation......................................   9,600      220,800
QRS Corporation (b).......................................   2,700      146,138
Scientific-Atlanta, Inc. .................................  17,100      624,150
Shared Medical Systems Corporation........................   5,900      353,263
Sun Microsystems, Inc. (b)................................ 177,100   12,020,663
Symantec Corporation (b)..................................  12,100      366,025
Tektronix, Inc. ..........................................  10,200      323,213
Tellabs, Inc. (b).........................................  89,600    5,516,000
Texas Instruments Incorporated............................  89,700   12,916,800
3Com Corporation (b)......................................  82,600    1,992,725
Xilinx, Inc. (b)..........................................  33,000    2,058,375
Xerox Corporation......................................... 151,400    7,380,750
                                                                   ------------
                                                                    399,170,608
                                                                   ------------
Transportation--1.1%
AMR Corporation...........................................  40,200    2,607,975
Airborne Freight Corporation..............................  10,700      266,831
Alaska Air Group, Inc. (b)................................   5,800      257,375
Consolidated Freightways Corporation (b)..................   4,700       49,644
Delta Air Lines, Inc. ....................................  32,000    1,908,000
FDX Holding Corporation (b)...............................  67,800    3,038,288
GATX Corporation..........................................  11,300      450,587
Norfolk Southern Corporation..............................  86,600    2,533,050
Roadway Express, Inc. ....................................   4,300       93,794
Ryder System, Inc. .......................................  15,700      369,931
Southwest Airlines Co. ................................... 114,775    2,123,338
UAL Corporation (b).......................................  11,900      754,906
Yellow Corporation (b)....................................   5,400       92,475
                                                                   ------------
                                                                     14,546,194
                                                                   ------------
Utilities--8.8%
AGL Resources Inc. .......................................  12,600      237,825
American Water Works, Inc. ...............................  21,400      640,662
Ameritech Corporation..................................... 251,500   18,422,375
Aquarion Company..........................................   2,250       78,750
Bell Atlantic Corporation................................. 355,322   22,651,777
BellSouth Corporation..................................... 433,500   20,808,000
Cleco Corporation.........................................   4,700      150,988
</TABLE>

                       See Notes to Financial Statements
<TABLE>
<CAPTION>
                                                       SHARES      VALUE
<S>                                                    <C>     <C>


Utilities--(continued)
Cascade Natural Gas Corporation.......................   2,000 $       35,875
Connecticut Energy Corporation........................   2,200         84,150
Consolidated Natural Gas Company......................  21,800      1,365,225
Eastern Enterprises...................................   5,000        194,687
El Paso Energy Corporation............................  27,800        995,587
Energen Corporation...................................   6,200        116,250
Enron Corp. ..........................................  80,700      6,874,631
Equitable Resources, Inc. ............................   7,600        281,675
IDACORP Inc...........................................   8,200        253,687
KeySpan Corporation...................................  32,700        907,425
LG&E Energy Corp. ....................................  29,700        642,263
MCN Energy Group, Inc. ...............................  18,300        390,019
New Century Energies, Inc. ...........................  25,900        898,406
NICOR Inc. ...........................................  10,400        401,700
Northwest Natural Gas Company.........................   5,200        137,150
Northwestern Corporation..............................   4,800        120,000
OGE Energy Corp. .....................................  17,800        421,638
Peoples Energy Corporation............................   7,900        290,819
Potomac Electric Power Company........................  27,100        777,431
Questar Corporation...................................  18,100        340,506
SBC Communications Inc. .............................. 449,458     25,703,380
Sonat Inc. ...........................................  25,200        886,725
Telephone and Data Systems, Inc. .....................  13,700      1,018,938
Union Pacific Resources Group, Inc. ..................  56,800      1,011,750
U S West, Inc. ....................................... 114,941      6,587,556
Washington Gas Light Company..........................  10,100        281,538
Williams Companies, Inc. .............................  98,700      4,151,641
                                                               --------------
                                                                  118,161,029
                                                               --------------
TOTAL INVESTMENTS (a)--99.9%.................................. $1,345,626,734
Other Assets, less liabilities--0.1%..........................      1,778,047
                                                               --------------
NET ASSETS--100.0%............................................ $1,347,404,781
                                                               ==============
</TABLE>
- -------
(a) The aggregate cost for book and federal income tax purposes is
    $1,006,703,336, the aggregate gross unrealized appreciation is
    $357,620,142, and the aggregate gross unrealized depreciation is
    $18,696,744, resulting in net unrealized appreciation of $338,923,398.
(b) Non-income producing security.

                                      22
<PAGE>

                         DOMINI SOCIAL INDEX PORTFOLIO
                      STATEMENT OF ASSETS AND LIABILITIES

                                 July 31, 1999

<TABLE>
<S>                                                              <C>
ASSETS:
Investments at value (Cost $1,006,703,336)...................... $1,345,626,734
Cash............................................................      7,020,013
Receivable for securities sold..................................      1,738,780
Dividends receivable............................................      1,282,406
                                                                 --------------
   Total assets.................................................  1,355,667,933
                                                                 --------------
LIABILITIES:
Payable for securities purchased................................      8,037,683
Accrued expenses (Note 2).......................................        225,469
                                                                 --------------
   Total liabilities............................................      8,263,152
                                                                 --------------
NET ASSETS APPLICABLE TO INVESTORS' BENEFICIAL INTERESTS........ $1,347,404,781
                                                                 ==============
</TABLE>

                            STATEMENT OF OPERATIONS

                        For the year ended July 31, 1999

<TABLE>
<S>                                                   <C>          <C>
INVESTMENT INCOME
Dividends (net of foreign withholding tax of $440)..               $  9,845,270
                                                                   ------------
EXPENSES:
Management fee (Note 2).............................                  1,901,529
Professional fees...................................                     65,407
Custody fees (Note 3)...............................                    367,440
Trustee fees........................................                      5,000
Miscellaneous.......................................                      2,356
                                                                   ------------
Total expenses......................................                  2,341,732
 Fees paid indirectly...............................                   (345,517)
 Expenses paid and fee waived by manager............                   (109,912)
                                                                   ------------
   Net expenses.....................................                  1,886,303
                                                                   ------------
NET INVESTMENT INCOME...............................                  7,958,967
NET REALIZED GAIN ON INVESTMENTS
Proceeds from sales.................................  $ 86,482,202
Cost of securities sold.............................    70,606,930
                                                      ------------
   Net realized gain on investments.................                 15,875,272
NET CHANGES IN UNREALIZED APPRECIATION OF INVEST-
 MENTS
 Beginning of year..................................  $175,720,768
 End of year........................................   338,923,398
                                                      ------------
   Net change in unrealized appreciation............                163,202,630
                                                                   ------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERA-
 TIONS..............................................               $187,036,869
                                                                   ============
</TABLE>

                       See Notes to Financial Statements

                                       23
<PAGE>

                         DOMINI SOCIAL INDEX PORTFOLIO
                      STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                                    FOR THE
                                                     FOR THE       YEAR ENDED
                                                    YEAR ENDED      JULY 31,
                                                  JULY 31, 1999       1998
<S>                                               <C>             <C>
INCREASE (DECREASE) IN NET ASSETS
From Operations:
 Net investment income........................... $    7,958,967  $  4,628,319
 Net realized gain on investments................     15,875,272     4,836,426
 Net change in unrealized appreciation of invest-
  ments..........................................    163,202,630    84,559,360
                                                  --------------  ------------
 Net Increase in Net Assets Resulting from Opera-
  tions..........................................    187,036,869    94,024,105
                                                  --------------  ------------
Transactions in Investors' Beneficial Interest:
 Additions.......................................    531,746,685   267,044,708
 Reductions......................................    (13,614,408)  (11,192,148)
                                                  --------------  ------------
 Net Increase in Net Assets from Transactions in
  Investors' Beneficial Interests................    518,132,277   255,852,560
                                                  --------------  ------------
Total Increase in Net Assets.....................    705,169,146   349,876,665

NET ASSETS:
 Beginning of year...............................    642,235,635   292,358,970
                                                  --------------  ------------
 End of year..................................... $1,347,404,781  $642,235,635
                                                  ==============  ============
</TABLE>

                             FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                  FOR THE YEARS ENDED JULY 31,
                          ----------------------------------------------------------------------
                             1999             1998            1997         1996           1995
<S>                       <C>               <C>             <C>          <C>             <C>
Net Assets (000's)......  $1,347,405        $642,236        $292,359     $100,401        $54,003
Ratio of net investment
 income to average net
 assets.................        0.84%(1)        1.05%(2)        1.34%        1.48%(4)       1.85%(5)
Ratio of expenses to av-
 erage net assets.......        0.24%(1)(3)     0.24%(2)(3)     0.29%(3)     0.59%(3)(4)    0.43%(5)
Portfolio turnover
 rate...................           8%              5%              1%           5%             6%
</TABLE>

(1) Reflects a voluntary expense reimbursement and fee waiver of 0.01% by the
    Manager. Had the manager not waived their fee and reimbursed expenses, the
    annualized ratios of net investment income and expense to average net
    assets for the year ended July 31, 1999 would have been 0.83% and 0.25%,
    respectively.
(2) Reflects a waiver of 0.01% of fees by the Manager due to limitations set
    forth in the Management Agreement. Had the Manager not waived their fees,
    the ratios of net investment income and expenses to average net assets for
    the year ended July 31, 1998 would have been 1.04% and 0.25%,
    respectively.
(3) Ratio of expenses to average net assets for the years ended July 31, 1999,
    1998, 1997 and 1996 include indirectly paid expenses. Excluding indirectly
    paid expenses, the expense ratios would have been 0.20%, 0.20%, 0.25% and
    0.50% for the years ended July 31, 1999, 1998, 1997 and 1996,
    respectively.
(4) Had the Expense Payment Agreement and Sponsor Arrangement not been in
    place, the ratios of net investment income and expense for the years ended
    July 31, 1996 would have been 1.14% and 0.85% respectively.
(5) Reflects a voluntary waiver of fees by the Administrator and Adviser due
    to the limitations set forth in the Expense Reimbursement Agreement. Had
    the Administrator and Adviser not waived their fees, the ratios of net
    investment income and expenses to average net assets for the year ended
    July 31, 1995 would have been 1.75% and 0.53% respectively.

                       See Notes to Financial Statements

                                      24
<PAGE>

                  DOMINI SOCIAL INDEX PORTFOLIO/July 31, 1999

                         NOTES TO FINANCIAL STATEMENTS

NOTE 1--Organization and Significant Accounting Policies
  Domini Social Index Portfolio (the "Index Portfolio") is registered under
the Investment Company Act of 1940 (the "Act") as a no-load, diversified,
open-end management investment company which was organized as a trust under
the laws of the State of New York on June 7, 1989. The Index Portfolio intends
to correlate its investment portfolio as closely as is practicable with the
Domini 400 Social Index (the "Index"), which is a common stock index developed
and maintained by Kinder, Lydenberg, Domini & Co., Inc. ("KLD"). The
Declaration of Trust permits the Trustees to issue an unlimited number of
beneficial interests in the Index Portfolio. The Index Portfolio commenced
operations upon effectiveness on August 10, 1990 and began investment
operations on June 3, 1991.
  The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates. The
following is a summary of the Index Portfolio's significant accounting
policies.
  (A) Valuation of Investments: The Index Portfolio values securities at the
      last reported sale price, or at the last reported bid price if no sales
      are reported.
  (B) Dividend Income: Dividend income is reported on the ex-dividend date.
  (C) Federal Taxes: The Index Portfolio will be treated as a partnership for
      U.S. federal income tax purposes and is therefore not subject to U.S.
      federal income tax. As such, each investor in the Index Portfolio will
      be taxed on its share of the Index Portfolio's ordinary income and
      capital gains. It is intended that the Portfolio will be managed in
      such a way that an investor will be able to satisfy the requirements of
      the Internal Revenue Code applicable to regulated investment companies.
  (D) Other: Investment transactions are accounted for on the trade date.
      Gains and losses are determined on the basis of identified cost.

NOTE 2--Transactions With Affiliates
  (A) Manager. Domini Social Investments LLC ("DSIL" or the "Manager") is
      registered as an investment adviser under the Investment Advisers Act
      of 1940. The services provided by the Manager consist of investment
      supervisory services, overall operational support and administrative
      services. The administrative services include the provision of general
      office facilities and supervising the overall administration of the
      Index Portfolio. For its services under the Management Agreement, the
      Manager receives from the Index Portfolio a fee accrued daily and paid
      monthly at an annual rate equal to 0.20%. Currently, DSIL is waiving
      its fee to the extent necessary to keep aggregate annual operating
      expenses of the Index Portfolio (excluding brokerage fees and
      commissions, interest, taxes and other extraordinary expenses) at no
      greater than 0.20% of the average daily net assets of the Index
      Portfolio. This fee waiver is voluntary and may be reduced or
      terminated at any time.
  (B) Submanager. Mellon Equity provides investment submanagement services to
      the Index Portfolio on a day-to-day basis pursuant to a Submanagement
      Agreement with DSIL. Mellon Equity does not determine the composition
      of the Domini Social Index. Under the Submanagement Agreement, DSIL
      pays Mellon Equity an investment submanagement fee equal, on an annual
      basis, to 0.10% of the average daily net assets of the Portfolio.

NOTE 3--Investment Transactions
  Cost of purchases and sales of investments, other than U.S. Government
securities and short-term obligations, for the year ended July 31, 1999
aggregated $609,803,880 and $86,482,202, respectively. Custody fees of the
Portfolio were reduced by $345,517 which was compensation for uninvested cash
left on deposit with the custodian.

                                      25
<PAGE>

                          [LOGO OF KPMG APPEARS HERE]

                          INDEPENDENT AUDITORS' REPORT

The Board of Trustees and Investors
Domini Social Index Portfolio:

  We have audited the accompanying statement of assets and liabilities,
including the portfolio of investments, of Domini Social Index Portfolio as of
July 31, 1999, the related statement of operations for the year then ended, and
the statements of changes in net assets for each of the years in the two-year
period then ended, and the financial highlights for each of the years in the
five-year period then ended. These financial statements and financial
highlights are the responsibility of the Portfolio's management. Our
responsibility is to express an opinion on these financial statements and
financial highlights based on our audits.
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities owned as of July
31, 1999 by correspondence with the custodian and brokers. An audit also
includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.
  In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of
Domini Social Index Portfolio as of July 31, 1999, the results of its
operations for the year then ended, changes in its net assets for each of the
years in the two-year period then ended, and financial highlights for each of
the years in the five-year period then ended, in conformity with generally
accepted accounting principles.

                                                            [LOGO OF KPMG LLP
                                                            APPEARS HERE]

Boston, Massachusetts
August 25, 1999

                                       26
<PAGE>

                       THIS PAGE INTENTIONALLY LEFT BLANK
                                   YOUR NOTES

                                       27
<PAGE>

                                                                   Annual Report
- --------------------------------------------------------------------------------

                                      [LOGO OF GREEN CENTURY FUNDS APPEARS HERE]

                                                                   July 31, 1999

INVESTMENT ADVISER (Balanced Fund) AND ADMINISTRATOR
Green Century Capital Management, Inc.
29 Temple Place
Boston, MA 02111
1-800-93-GREEN

INVESTMENT SUBADVISER (Balanced Fund)
Winslow Management Company
60 State Street
Boston, MA 02109

INVESTMENT MANAGER (Index Portfolio)
Domini Social Investments LLC
11 West 25th Street
New York, NY 10010

INVESTMENT SUBMANAGER (Index Portfolio)
Mellon Equity Associates
500 Grant Street, Suite 3700
Pittsburgh, PA 15258-0001

COUNSEL TO INDEPENDENT TRUSTEES OF THE FUNDS
Debevoise & Plimpton
555 13th Street, N.W.
Washington, DC 20004

SUBADMINISTRATOR and DISTRIBUTOR
Sunstone Financial Group, Inc. (Subadministrator)
Sunstone Distribution Services, LLC (Distributor)
207 East Buffalo Street, Suite 400
Milwaukee, WI 53202

CUSTODIAN
Investors Bank & Trust Company
200 Clarendon Street
Boston, MA 02116

TRANSFER AGENT
Unified Fund Services, Inc.
431 North Pennsylvania Street
Indianapolis, IN 46204-1806

COUNSEL TO GREEN CENTURY CAPITAL MANAGEMENT, INC.
Goulston & Storrs
400 Atlantic Avenue
Boston, MA 02110

INDEPENDENT AUDITORS
KPMG LLP
99 High Street
Boston, MA 02110

                                                                   Balanced Fund
- --------------------------------------------------------------------------------
                                                                     Equity Fund

[LOGO OF GREEN CENTURY FUNDS APPEARS HERE]

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