Green Century Balanced Fund NCSRS Certified semi-annual shareholder report (management investment company)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORMN-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED

MANAGEMENT INVESTMENT COMPANIES

Investment Company Act File Number811-06351

Green Century Funds

114 State Street

Suite 200

Boston, MA 02109

(Address of principal executive offices)

Green Century Capital Management, Inc.

114 State Street

Suite 200

Boston, MA 02109

(Name and address of agent for service)

Registrant’s telephone number, including area code: (617)482-0800

Date of fiscal year end: July 31

Date of reporting period: January 31, 2019

Item 1. Reports to Stockholders

The following is a copy of the report transmitted to shareholders pursuant to Rule30e-1 under the Investment Company Act of 1940 (17 CFR270.30e-1).


		SEMI-ANNUAL REPORT Green Century Balanced Fund Green Century Equity Fund Green Century MSCI International Index Fund January 31, 2019

An investment for your future.^®		114 State Street, Boston, Massachusetts 02109

For information on the Green Century Funds^®, call 1-800-93-GREEN. For information on how to open an account and account services, call 1-800-221-5519 8:00 am to 6:00 pm Eastern Time, Monday through Friday. For daily share price information twenty-four hours a day, visit www.greencentury.com.

Dear Green Century Funds Shareholder:

Although 2018 was a volatile year for the market, I am very pleased to report that all three of Green Century’s Funds performed strongly during the one year period that ended December 31, 2018—and late in the year, the Green Century Equity Fund was named as one of the top 10 socially conscious funds in the U.S., based on performance, by Bloomberg.*

The continued growth in responsible investing was another notable feature of 2018. According to the latest report from the U.S. SIF Foundation, sustainable, responsible, and impact investing assets now account for one in four dollars under professional management in the United States.

As interest in responsible investing has grown so, too, have the number of “green” mutual funds, available to investors. While I, obviously, welcome the increased interest in sustainable investing, I do fear that many of these new entrants are not as responsible as they claim.

Of course, as a Green Century investor, you need not share this concern. Green Century is more than just a pioneer in responsible investing, we strive to remain the gold standard. Green Century offers investors an unparalleled opportunity to make an impact with their investments.

Green Century invests in sustainable, solution-oriented companies, houses a robust andin-depth shareholder advocacy program, and provides funding for the environmental and public health campaigns of our nonprofit owners. Below are just a few of the ways your investment with Green Century helped us make a positive environmental impact in 2018:

•

Starbuck’s¹ Sustainability Bond, a holding in the Green Century Balanced Fund, is improving the environmental and social impact of Starbuck’s supply chain and supporting coffee farmers who commit to promote long-term productivity and sustainability by keeping soil healthy, conserving water, and growing shade trees to protect wildlife.

•

After Green Century filed a shareholder proposal with Verizon Communications, Inc.,¹ a holding in the Green Century Equity Fund, it announced a commitment to source the equivalent of 50% of its annual electricity usage from renewable sources by 2025.

•

Danone,¹ a holding in the Green Century International Index Fund, was ranked 11th in Fortune’s “Change the World” list of companies taking on society’s biggest problems, in 2018. It has committed to becoming carbon neutral across its full value chain by 2050.

•

Green Century provided direct support to the U.S. PIRG Education Fund’s multi-year—and ultimately successful—campaign aimed at convincing the McDonald’s Corporation,¹ the largest purchaser of beef in the world, to restrict the use of medically important antibiotics in its beef supply chain. McDonald’s new commitment could steer further change towards antibiotic stewardship. Incredibly, an estimated 70 percent of antibiotics used in modern human medicine are sold for use in meat and dairy production in the U.S.

While market volatility that marked 2018 appears to have settled down for now, it is impossible to predict what the rest of the year will hold. If 2019 proves to be as tumultuous as last year, I encourage you to remember your goals.

You invest with Green Century to save for the future and make a difference in the world. No matter what happens in the market on any given day, we remain committed to protecting the environment, promoting clean energy, reducing plastic pollution, and more—and your investments make our work possible. If you missed our recent Best of 2018 list, take a moment to read through what your investments helped us achieve at:www.greencentury.com/the-best-of-2018/.

Sincerely,

Leslie Samuelrich, President

Green Century Capital Management

THE GREEN CENTURY BALANCED FUND

The Green Century Balanced Fund seeks capital growth and income from a diversified portfolio of stocks and bonds that meet Green Century’s standards for corporate environmental performance. The portfolio managers of the Balanced Fund avoid fossil fuel companies and aim to invest in companies that are in the business of solving environmental problems or that are committed to reducing their environmental impact.

CUMULATIVE
RETURNS*

AVERAGE ANNUAL RETURNS*

Total expense ratio: 1.48%

Six Months

One Year

Five Years

Ten Years

December 31, 2018

Green Century Balanced Fund

–2.68%

–2.14%

4.23%

8.65%

Custom Balanced Fund Index²

–3.72%

–2.36%

5.85%

9.28%

January 31, 2019

Green Century Balanced Fund

0.16%

0.29%

6.00%

9.59%

Custom Balanced Fund Index²

–0.78%

–0.12%

7.30%

10.44%

* 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. Current performance may be lower or higher than the performance information quoted. To obtain performance information as of the most recentmonth-end, call1-800-93-GREEN. Performance includes the reinvestment of income dividends and capital gain distributions. Performance shown does not reflect the deduction of taxes that a shareholder might pay on Fund distributions or the redemption of Fund shares. A redemption fee of 2.00% may be imposed on redemptions or exchanges of shares you have owned for 60 days or less. Please see the Prospectus for more information.

During the six month period ended January 31, 2019, the Balanced Fund outperformed the Custom Balanced Index, with the Balanced Fund returning 0.16% and the Custom Balanced index returning –0.78%. For the one year period ending January 31, 2019, the Balanced Fund slightly outperformed the Custom Balanced Index. The Balanced Fund returned 0.29%, while the Custom Balanced Index returned –0.12%.

The Fund’s equity holdings that most positively contributed to relative performance during the twelve months ended January 31, 2019 included: Xilinx,¹ Mastercard,¹ Palo Alto Networks,¹ Merck,¹ and TJX.¹ Poor performers included Lincoln National,¹ Sealed Air,¹ Illinois Tool Works,¹ PNC Financial,¹ and KeyCorp.¹

The market rose significantly between the November 2016 and September 2018, and then moved sharply lower through December 2018. In the view of the Balanced Fund’s portfolio managers, the volatility in the latter part of the year was tied to rising interest rates, evidence of slowing global growth, and rising macro uncertainty tied to Brexit and the trade war with China.

The portfolio manager’s outlook has remained relatively steady, focusing on long-term, leading economic indicators rather than the volatile news cycle. While economic and geopolitical risks remain elevated, a broad set of data continues to forecast positive, though slower, growth in 2019 for both the U.S. and the global economy. The investment community has clearly turned the page from the blind optimism of 2017 to a more aware—and nervous—investor ecosystem, but lower valuations have helped to balance forward risks and returns thus far in 2019.

The Fund’s portfolio managers have consistently argued that the 2017 Tax Reform Act’s effects on earnings and economic growth would only be short-term in nature and that consumer and investor optimism was misplaced. Their call now appears to be priced into the market. Forecasts for 2019 earnings growth are lower

than for 2018, and the Conference Board’s Consumer Expectations Index is at its lowest level since the inauguration of President Trump. However, in spite of both stock and bond market volatility and recent economic data softness, neither markets nor data are indicating a near-term recession. The consensus estimate of real GDP growth is now 2.5% for 2019, down only slightly from 2.9% in 2018 and still above average for the current cycle. Other data, though also coming off of cycle highs, remain relatively strong as well.

Employment continues to grow, with wages incrementally improving and bringing new entrants into the labor market. Consumer balance sheets appear very healthy, with household debt service coverage at a40-year low. Other leading economic indicators including Purchasing Managers Indices are still well above contraction or recession levels. As always, there are many sources of risk and uncertainty to our economic

outlook, some of which manifest more directly and rapidly than others. Employers report difficulty hiring at this low unemployment rate, and it is unclear how much additional labor force elasticity remains, even though increasing wages have brought new, “undiscouraged” workers into the labor market. After pressing interest rates higher and affecting sectors such as housing and autos, the Federal Reserve appears to be near the end of its tightening cycle. These are common late-cycle headwinds, and while their effects tend to emerge slowly, they will make it increasingly difficult for economic growth to remain strong.

Other types of risks are less predictable, and can develop much more rapidly. While the portfolio managers note that trade wars are neither good nor easy to win, investors’ capacity for anticipating President Trump’s negotiations is limited. Trump has acknowledged that the trade war is affecting financial markets, and it is possible

GREEN CENTURY BALANCED FUND

INVESTMENT BY INDUSTRY (unaudited)

LOGO

that market volatility will impact his motivation to make a deal with China. Changing sentiment is itself a risk. Spending and, particularly, investments by both companies and consumers depend on confident expectations of future growth. Emerging recession fears are potentially self-fulfilling if enough companies and consumers respond to their concerns by delaying or avoiding hiring, investing, and spending, even though the Fund’s managers do not now see the type of excesses that led to past market collapses.

The Balanced Fund’s portfolio managers expect continuing volatility in financial markets, but consider the long-termrisk-to-reward ratio of the equity market to be reasonably balanced. As such, they have continued cautious but balanced positioning over the last few months. The U.S. economy is now at full employment, limiting the potential for further expansion. The Fund’s managers remain concerned about heightened geopolitical risk, as international friends and adversaries alike respond with alarm to President Trump’s often vacillating positions on a variety of major trade, currency, and defense issues. Therefore, the portfolio managers have continued a moderate allocation to stocks within the portfolio, favoring companies that the managers believe will produce consistent growth, and continue to have lower average maturity of the bond holdings, favoring high quality bonds, which they believe will lower the level of risk for the portfolio. The Balanced Fund’s portfolio managers believe the Fund is positioned to benefit from the steady, if slow, economic growth they expect for the United States in 2019.

The Green Century Balanced Fund invests in the stocks and bonds of environmentally responsible corporations of various sizes, including small, medium, and large companies. The Green Century Balanced Fund does not invest in fossil fuels though most other diversified mutual funds do. The portfolio managers continue to feel that their emphasis on companies with sustainable models for growth is both appropriate and wise, especially in an unsettled market environment. In many ways, 2018 is likely to mark the beginning of the real transition of our energy system from fossil to renewable fuels. This transition is occurring, not because of the hard work in the Paris international climate negotiations or the physical devastation suffered by many due to the changing climate, but because of economics. In 2018, utilities voluntarily pledged to give up carbon electricity in fossil fuel-rich states Colorado and Indiana. Cities and states including New York, Washington D.C., Oregon and Hawaii pledged to decarbonize. Corporate purchases of wind and solar generated electricity skyrocketed. In 2018, building new wind and solar became cheaper than running existing coal or gas generation assets. We are now in a full-fledged transition to a renewable energy-based economy.

The value of the stocks held in the Balanced Fund will fluctuate in response to factors that may affect a single issuer, industry, or sector of the economy or may affect the market as a whole. Bonds are subject to a variety of risks including interest rate, credit, and inflation risk.

THE GREEN CENTURY EQUITY FUND

The Green Century Equity Fund invests essentially all of its assets in the stocks which make up the MSCI KLD 400 Social ex Fossil Fuels Index (the KLD 400 Index or the Index),³ comprised primarily of large capitalization U.S. companies selected based on comprehensive environmental, social and governance sustainability criteria. The Equity Fund seeks to provide shareholders with a long-term total return that matches that of the Index.

CUMULATIVE
RETURNS*

AVERAGE ANNUAL RETURNS*

Six Months

One Year

Five Years

Ten Years

December 31, 2018

Green Century Equity Fund — Individual Investor Share Class

–6.45%

–4.00%

7.70%

12.21%

Green Century Equity Fund — Institutional Share Class

–6.30%

–3.79%

7.75%

12.24%

S&P 500^® Index⁴

–6.85%

–4.38%

8.49%

13.12%

January 31, 2019

Green Century Equity Fund — Individual Investor Share Class

–2.38%

–2.53%

10.02%

14.07%

Green Century Equity Fund — Institutional Share Class

–2.24%

–2.32%

10.07%

14.09%

S&P 500^® Index⁴

–3.00%

–2.31%

10.96%

15.00%

The Individual Investor Share Class total expense ratio of the Fund is 1.25% and the Institutional Share Class total expense ratio of the Fund is 0.95% as of the most recent prospectus.

As of April 1, 2014, the Equity Fund invests in the common stocks which make up the MSCI KLD 400 Social ex Fossil Fuel Index; prior to April 1, 2014, the Fund invested in the common stocks which made up the MSCI KLD 400 Social Index.

During the six month period ended January 31, 2019, the Green Century Equity Fund, which closely tracks the KLD 400 Index, outperformed the S&P 500^® Index (the S&P 500) by 62 basis points in the Individual Investor Share Class and by 76 basis points in the Institutional Share Class. The Equity Fund returned –2.38% in the Individual Investor Share Class and –2.24% in the Institutional Share Class for this six month period ended January 31, 2019, while the S&P 500 returned –3.00% during the same period.

As the KLD 400 Index does not include all of the stocks in the S&P 500 and includes some stocks not in the S&P 500 Index, the performance of the Equity Fund can be expected to differ from the performance of the broader benchmark. The difference in performance of the Equity Fund relative to the S&P 500 was influenced by differences in sector allocation and stock selection criteria between the Fund and the Index.

According to an analysis by the Fund’s portfolio managers, the strongest performing sectors in the Equity Fund were Utilities, Consumer Staples and Real Estate, which returned 9.29%, 5.40%, and 3.67%, respectively. The worst performing sectors were Financials and Industrials, which returned –5.82% and –4.73%, respectively, for the six month period.

Within the S&P 500^® Index, Real Estate and Utilities were the strongest performing sectors, gaining 6.31% and 5.37%, respectively. The worst performing sectors were Energy and Financials, which returned –15.99% and –6.25%, respectively, for the six month period.

The Equity Fund benefitted by not owning any securities in the Energy sector, which was the worst performing sector of the S&P 500 during the six month period, returning –15.99%. The performance of the Fund, relative to the S&P 500, was further boosted by the positive impact of stock selection in the Consumer Staples, Materials and Utilities sectors. The relative performance of the Fund was negatively impacted by stock selection in the Health Care and Real Estate sectors.

The Equity Fund, like other mutual funds invested primarily in stocks, carries the risk of investing in the stock market. The large companies in which the Equity Fund is invested may perform worse than the stock market as a whole. The Equity Fund will not shift concentration from one industry to another or from stocks to bonds or cash, in order to defend against a falling stock market.

GREEN CENTURY EQUITY FUND

INVESTMENT BY INDUSTRY (unaudited)

LOGO

THE GREEN CENTURY MSCI INTERNATIONAL INDEX FUND

The Green Century MSCI International Index Fund (the International Fund) invests in the stocks which make up the MSCI World ex USA SRI ex Fossil Fuels Index (the Index),⁵ comprised primarily of foreign companies selected based on comprehensive environmental, social and governance (ESG) sustainability criteria. The International Fund seeks to provide shareholders with a long-term total return that matches that of the Index.

CUMULATIVE
RETURNS*

AVERAGE
ANNUAL RETURNS*

Inception Date: September 30, 2016

Six Months

One Year

Since
Inception

December 31, 2018

Green Century MSCI International Index Fund — Individual Investor Share Class

–10.72%

–14.33%

1.27%

Green Century MSCI International Index Fund — Institutional Share Class

–10.60%

–14.07%

1.52%

MSCI World ex USA Index⁶

–11.64%

–14.09%

2.76%

January 31, 2019

Green Century MSCI International Index Fund — Individual Investor Share Class

–7.44%

–12.15%

3.97%

Green Century MSCI International Index Fund — Institutional Share Class

–7.31%

–11.96%

4.22%

MSCI World ex USA Index⁶

–7.61%

–12.06%

5.73%

The Individual Investor Share Class total expense ratio of the Fund is 1.28% and the Institutional Share Class total expense ratio of the Fund is 0.98% as of the most recent prospectus.

The Green Century MSCI International Index Fund closely tracks the MSCI World ex USA SRI ex Fossil Fuels Index. The International Fund’s Individual Investor Share Class returned –7.44% and the International Fund’s Institutional Share Class returned –7.31% for thesix-month period ended January 31, 2019, outperforming the MSCI World ex USA Index, the Fund’s benchmark, which returned –7.61% during the same period.

The MSCI World ex USA Index is not a values-based or SRI screened index and may invest in fossil fuels, nuclear weapons, and producers of genetically modified organisms. The difference in performance of the International Fund relative to this Index was largely due to differences in sector allocation and stock selection criteria between the Fund and the Index.

According to an analysis by the Fund’s portfolio managers, the Energy sector was the worst-performing sector of the Index during the period, returning –10.78%. The International Fund does not hold any securities in the Energy sector, contributing to a slight outperformance versus the Index. The International Fund’s performance relative to the Index was hindered by stock selection in the Real Estate sector, but boosted by stock selection in the Consumer Discretionary and Health Care sectors.

The International Fund, like other mutual funds invested primarily in stocks, carries the risk of investing in the stock market. The developedex-U.S. equities in which the International Fund is invested may perform worse than the stock market as a whole. The International Fund will not shift concentration from one industry to another or from stocks to bonds or cash, in order to defend against a falling stock market.

GREEN CENTURY MSCI INTERNATIONAL INDEX FUND

INVESTMENT BY COUNTRY (unaudited)

LOGO

The Green Century Funds’ proxy voting guidelines and a record of the Funds’ proxy votes for the year ended June 30, 2018 are available without charge, upon request, (i) at www.greencentury.com, (ii) by calling1-800-93-GREEN, (iii) sending an e-mail to info@greencentury.com, and (iv) on the Securities and Exchange Commission’s website at www.sec.gov.

The Green Century Funds file their complete schedule of portfolio holdings with the SEC for the first and third quarters of the year on FormN-Q. The Green Century Funds’ FormsN-Q are available on the EDGAR database on the SEC’s website atwww.sec.gov. Copies may be obtained upon payment of a duplicating fee, by writing the SEC’s Public Reference Section, Washington DC 20549-0102 or by electronic request at the following e-mail address:publicinfo@sec.gov. The information on FormN-Q may also be obtained by calling1-800-93-GREEN, or bye-mailing a request toinfo@greencentury.com.

* As of November 27, 2018, the Green Century Equity Fund was rated ninth among the top 10 Socially Conscious Funds by Bloomberg against 47open-end funds with ESG (Environmental, Social and Governance), Socially Responsible, Religiously Responsible, Environmentally Friendly, Clean Energy, or Climate Change as a general attribute in the fund prospectus, total assets of at least $100 million, an equity allocation greater than 80%, and a five-year history. The Green Century Equity Fund has been included in Bloomberg’s ranking of U.S. responsible funds three times since 2017: as of December 31, 2017 the Equity Fund was ranked in seventh place among U.S. Responsible Funds, ratedagainst 14 open-end funds with ESG (Environmental, Social and Governance) as a general attribute in the fund prospectus, total assets of at least $100 million, and a five-year history; and as of June 30, 2017, the Green Century Equity Fund was ranked in fifth place among 23open-end funds with ESG (Environmental, Social and Governance) as a general attribute in the fund prospectus, total assets of at least $100 million, and a five-year history. In all three rankings, retail funds were used, either primary or class A shares. Past performance is no guarantee of future results.

¹ As of January 31, 2019, the following companies comprised the listed percentages of each of the Green Century Funds:


Portfolio Holdings	GREEN CENTURY BALANCED FUND			GREEN CENTURY EQUITY FUND			GREEN CENTURY INTERNATIONAL INDEX FUND
Starbucks Corporation		1.89	%		0.86	%		0.00	%
Verizon Communications, Inc.		1.41	%		2.13	%		0.00	%
Danone SA		0.00	%		0.00	%		1.29	%
McDonald’s Corporation		0.00	%		1.30	%		0.00	%
Xilinx, Inc.		1.59	%		0.00	%		0.00	%
Mastercard, Inc. Class A		2.07	%		0.00	%		0.00	%
Palo Alto Networks, Inc.		1.00	%		0.00	%		0.00	%


Portfolio Holdings	GREEN CENTURY BALANCED FUND			GREEN CENTURY EQUITY FUND			GREEN CENTURY INTERNATIONAL INDEX FUND
Merck & Company, Inc.		1.70	%		1.85	%		0.00	%
The TJX Companies, Inc.		0.97	%		0.00	%		0.00	%
Lincoln National Corporation		0.64	%		0.00	%		0.00	%
Sealed Air Corporation		0.00	%		0.06	%		0.00	%
Illinois Tool Works, Inc.		0.63	%		0.39	%		0.00	%
The PNC Financial Services Group, Inc.		1.09	%		0.53	%		0.00	%
KeyCorp		0.90	%		0.16	%		0.00	%

Portfolio composition will change due to ongoing management of the Funds. Please refer to the Green Century Funds website for current information regarding the Funds’ portfolio holdings. Note that some of the holdings discussed above may not have been held by any Fund during thesix-month period ended January 31, 2019, or may have been held by a Fund for a portion of the period, or may have been held by a Fund for the entire period. These holdings are subject to risk as described in the Funds’ prospectus. References to specific investments should not be construed as a recommendation of the securities by the Funds, their administrator, or their distributor.

²The Custom Balanced Index is comprised of a 60% weighting in the S&P 1500 Index and a 40% weighting in the BofA Merrill Lynch1-10 Year US Corporate & Government Index (the BofA Merrill Lynch Index). The S&P Supercomposite 1500 Index is an unmanaged broad-based capitalization-weighted index comprising 1500 stocks oflarge-cap,mid-cap, andsmall-cap U.S. companies. The BofA Merrill Lynch Index tracks the performance of U.S. dollar-denominated investment grade government and corporate public debt issued in the U.S. domestic bond market with at least 1 year and less than 10 years remaining maturity, including U.S. treasury, U.S. agency, foreign government, supranational and corporate securities. It is not possible to invest directly in the Custom Balanced Index, the S&P Supercomposite 1500 Index, or the BofA Merrill Lynch Index.

³The MSCI KLD 400 Social ex Fossil Fuels Index (the KLD400 ex Fossil Fuels Index) is a custom index calculated by MSCI Inc. and is comprised of the common stocks of the approximately 400 companies in the MSCI KLD 400 Social Index (the KLD400 Index), minus the stocks of the companies that explore for, extract, produce, manufacture or refine coal, oil or gas or produce or transmit electricity derived from fossil fuels or transmit natural gas or have carbon reserves included in the KLD400 Index. The KLD400 Index is a free float-adjusted market capitalization index designed to provide exposure to U.S. companies that have positive Environmental, Social and Governance (ESG) characteristics and consists of approximately 400 companies selected from the MSCI USA Investable Market Index. It is not possible to invest directly in an index.

⁴ The S&P 500^® 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^® Index is heavily weighted toward stocks with large market capitalization and represents approximatelytwo-thirds of the total market value of all domestic stocks. It is not possible to invest directly in the S&P 500^® Index.

⁵ The World ex USA SRI ex Fossil Fuels Index is a custom index calculated by MSCI Inc. The World ex USA SRI ex Fossil Fuels Index is comprised of the common stocks of the companies in the MSCI World ex USA SRI Index (the World ex USA SRI Index), minus the stocks of the companies that explore for, extract, produce, manufacture or refine coal, oil or gas or produce or transmit electricity derived from fossil fuels or transmit natural gas or have carbon reserves included in the World ex USA SRI (Socially Responsible Investment) Index. The World ex USA SRI Index includes large andmid-cap stocks from approximately 22 developed market countries (excluding the U.S.). The World ex USA SRI Index is a capitalization weighted index that provides exposure to companies with what MSCI calculates to have outstanding ESG ratings and excludes companies whose products have negative social or environmental impacts. It is not possible to invest directly in an index.

⁶The MSCI World ex USA Index is a custom index calculated by MSCI Inc. The MSCI World ex USA Index includes large andmid-cap stocks across 22 of 23 Developed Markets countries and excludes the United States. With 1,023 constituents, the index covers approximately 85% of the free float-adjusted market capitalization in each country. The MSCI World ex USA Index is a free float-adjusted market capitalization index. It is not possible to invest directly in the MSCI World ex USA Index.

The Funds’ environmental criteria limit the investments available to the Funds compared to mutual funds that do not use environmental criteria.

This information has been prepared from sources believed reliable. The views expressed are as of the date of publication and are those of the Advisor to the Funds.

This material must be preceded or accompanied by a current Prospectus.

Distributor: UMB Distribution Services, LLC 3/19

The Green Century Equity Fund and the Green Century MSCI International Index Fund (the “Funds”) are not sponsored, endorsed, or promoted by MSCI, its affiliates, information providers or any other third party involved in, or related to, compiling, computing or creating the MSCI indices (the “MSCI Parties”), and the MSCI Parties bear no liability with respect to the Funds or any index on which a Fund is based. The MSCI Parties are not sponsors of the Funds and are not affiliated with the Funds in any way. The Statement of Additional Information contains a more detailed description of the limited relationship the MSCI Parties have with Green Century Capital Management and the Funds.

GREEN CENTURY FUNDS EXPENSE EXAMPLE

For the six months ended January 31, 2019 (unaudited)

As a shareholder of the Green Century Funds (the “Funds”), you incur two types of costs: (1) transaction costs, including redemption fees on certain redemptions; and (2) ongoing costs, including management fees and other Fund expenses. This example is intended to help you understand your ongoing costs (in dollars) of investing in the Funds and to compare these costs with the ongoing costs of investing in other mutual funds.

The example is based on an investment of $1,000 invested at the beginning of the period and held for the entire period from August 1, 2018 to January 31, 2019 (the “period”).

Actual Expenses The first line of the table below provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 equals 8.6), then multiply the result by the number in the first line under the heading entitled “Expenses Paid During the Period” to estimate the expenses you paid on your account during the period.

Hypothetical Example for Comparison Purposes The second line of the table below provides information about hypothetical account values and hypothetical expenses based on the Funds’ actual expense ratios and an assumed rate of return of 5% per year before expenses, which is not the actual return of either of the Funds. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Funds and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of other funds.

Please note that the expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any transactional costs, such as redemption fees on shares held for 60 days or less. Therefore, the second line of the table is useful in comparing the ongoing costs only, and will not help you determine the relative total costs of owning different funds. In addition, if these transactional costs were included, your costs could have been higher.


	BEGINNING ACCOUNT VALUE AUGUST 1, 2018		ENDING ACCOUNT VALUE JANUARY 31, 2019		EXPENSES PAID DURING THE PERIOD¹
Balanced Fund
Actual Expenses	$	1,000.00	$	1,001.60	$	7.47
Hypothetical Example, assuming a 5% return before expenses		1,000.00		1,017.54		7.53


	BEGINNING ACCOUNT VALUE AUGUST 1, 2018		ENDING ACCOUNT VALUE JANUARY 31, 2019		EXPENSES PAID DURING THE PERIOD

Equity Fund
Actual Expenses — Individual Investor Class¹	$	1,000.00	$	976.20	$	6.23
Actual Expenses — Institutional Class¹		1,000.00		977.60		4.73
Hypothetical Example, assuming a 5% return before expenses —Individual Investor Class		1,000.00		1,018.70		6.36
Hypothetical Example, assuming a 5% return before expenses —Institutional Class		1,000.00		1,020.21		4.84

	BEGINNING ACCOUNT VALUE AUGUST 1, 2018		ENDING ACCOUNT VALUE JANUARY 31, 2019		EXPENSES PAID DURING THE PERIOD¹

International Index Fund
Actual Expenses — Individual Investor Class	$	1,000.00	$	925.60	$	6.21
Actual Expenses — Institutional Class		1,000.00		926.90		4.76
Hypothetical Example, assuming a 5% return before expenses —Individual Investor Class		1,000.00		1,018.55		6.51
Hypothetical Example, assuming a 5% return before expenses —Institutional Class		1,000.00		1,020.06		4.99

¹ Expenses are equal to the Funds’ annualized expense ratios (1.48% for the Balanced Fund, 1.25% for the Equity Fund Individual Investor Class, 0.95% for the Equity Fund Institutional Class, 1.28% for the International Index Fund Individual Investor Class and 0.98% for the International Index Fund Institutional Class), multiplied by the average account value over the period, multiplied by 184/365 (to reflect theone-half year period).

GREEN CENTURY BALANCED FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)


COMMON STOCKS — 64.6%
	SHARES		VALUE

Software & Services — 7.4%
Adobe, Inc. (a)		6,573	$	1,628,921
Autodesk, Inc. (a)		11,965		1,761,248
Blackbaud, Inc.		16,690		1,195,004
MasterCard, Inc., Class A		23,949		5,056,352
Microsoft Corporation		50,734		5,298,152
PayPal Holdings, Inc. (a)		35,015		3,107,931

				18,047,608

Pharmaceuticals & Biotechnology — 5.8%
Celgene Corporation (a)		27,219		2,407,793
Gilead Sciences, Inc.		42,241		2,957,292
Illumina, Inc. (a)		6,759		1,891,101
IQVIA Holdings, Inc. (a)		11,283		1,455,620
Merck & Company, Inc.		55,816		4,154,385
Waters Corporation (a)		5,791		1,338,995

				14,205,186

Capital Goods — 4.7%
A.O. Smith Corporation		25,088		1,200,711
Hexcel Corporation		37,314		2,526,531
Illinois Tool Works, Inc.		11,220		1,540,618
Ingersoll-Rand PLC		26,748		2,675,870
Middleby Corporation (The) (a)		10,569		1,243,126
Wabtec Corporation		11,699		809,103
Xylem, Inc.		21,084		1,502,446

				11,498,405

Healthcare Equipment & Services — 4.6%
Baxter International, Inc.		28,987		2,101,268
Cigna Corporation		22,049		4,405,611
Medtronic PLC (b)		22,868		2,021,302
Quest Diagnostics, Inc.		13,466		1,176,255
Stryker Corporation		8,950		1,589,251

				11,293,687

Insurance — 4.4%
Aflac, Inc.		56,782		2,708,501
Chubb Ltd. (b)		15,375		2,045,644
Lincoln National Corporation		26,948		1,576,189
Reinsurance Group of America, Inc.		16,034		2,316,111
Travelers Companies, Inc. (The)		17,303		2,172,219

				10,818,664


	SHARES		VALUE

Media & Entertainment — 4.3%
Alphabet, Inc., Class A (a)		6,261	$	7,049,197
Facebook, Inc., Class A (a)		13,120		2,186,973
Omnicom Group, Inc.		15,070		1,173,652

				10,409,822

Retailing — 4.2%
Booking Holdings, Inc. (a)		968		1,774,160
Home Depot, Inc. (The)		13,443		2,467,194
Target Corporation		26,125		1,907,125
TJX Companies, Inc. (The)		47,508		2,362,573
Tractor Supply Company		20,224		1,727,129

				10,238,181

Banks — 3.4%
East West Bancorp, Inc.		22,236		1,118,916
First Republic Bank		22,973		2,219,881
KeyCorp		133,909		2,205,481
PNC Financial Services Group, Inc. (The)		21,808		2,675,187

				8,219,465

Semiconductors — 3.2%
Analog Devices, Inc.		24,092		2,381,735
ASML Holding NV (b)		8,209		1,436,821
Xilinx, Inc.		34,708		3,885,214

				7,703,770

Technology Hardware & Equipment — 3.0%
Apple, Inc.		17,962		2,989,595
Cisco Systems, Inc.		41,256		1,950,996
Palo Alto Networks, Inc. (a)		11,424		2,454,104

				7,394,695

Food & Beverage — 2.7%
General Mills, Inc.		300		13,332
McCormick & Company, Inc.		24,042		2,972,553
Unilever NV (b)		68,172		3,647,884

				6,633,769

Real Estate — 2.2%
AvalonBay Communities, Inc.		10,785		2,080,642
Boston Properties, Inc.		12,467		1,644,023
SBA Communications Corporation, Class A (a)		9,695		1,769,629

				5,494,294

GREEN CENTURY BALANCED FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

continued


	SHARES		VALUE

Renewable Energy & Energy Efficiency — 1.9%
First Solar, Inc. (a)		30,177	$	1,526,654
Hannon Armstrong Sustainable Infrastructure Capital, Inc.		53,040		1,198,174
Ormat Technologies, Inc.		31,517		1,818,846

				4,543,674

Food & Staples Retailing — 1.8%
Costco Wholesale Corporation		15,608		3,349,945
Sysco Corporation		18,023		1,150,769

				4,500,714

Materials — 1.8%
Ball Corporation		43,591		2,278,938
International Flavors & Fragrances, Inc.		15,290		2,167,816

				4,446,754

Telecommunication Services — 1.4%
Verizon Communications, Inc.		62,591		3,446,260

Diversified Financials — 1.4%
Bank of New York Mellon Corporation (The)		29,888		1,563,740
Charles Schwab Corporation (The)		38,304		1,791,478

				3,355,218

Consumer Durables & Apparel — 1.3%
NIKE, Inc., Class B		19,253		1,576,436
VF Corporation		19,571		1,647,291

				3,223,727

Household & Personal Products — 1.3%
Church & Dwight Company, Inc.		28,772		1,858,959
Procter & Gamble Company (The)		12,767		1,231,632

				3,090,591

Utilities — 1.1%
American Water Works Company, Inc.		28,536		2,730,039

Transportation — 1.0%
J.B. Hunt Transport Services, Inc.		9,336		999,325
United Parcel Service, Inc., Class B		14,085		1,484,559

				2,483,884


	SHARES		VALUE

Consumer Services — 0.8%
Starbucks Corporation		27,442	$	1,869,898

Automobiles & Components — 0.5%
BorgWarner, Inc.		29,100		1,190,190

Commercial & Professional Services — 0.4%
Verisk Analytics, Inc. (a)		9,081		1,066,200

Total Common Stocks (Cost $111,763,241)				157,904,695

	PRINCIPAL AMOUNT

BONDS & NOTES — 31.7%
Green and Sustainability Bonds, Renewable Energy & Energy Efficiency — 17.1%
Apple, Inc. 2.85%, due 2/23/23 (c)	$	3,000,000		3,011,034
Apple, Inc. 3.00%, due 6/20/27 (c)		1,000,000		977,787
Asian Development Bank 2.125%, due 3/19/25 (b)		1,000,000		971,597
Bank of America Corporation 2.151%, due 11/9/20 (c)		1,750,000		1,727,215
Boston Properties LP 4.50%, due 12/1/28 (c)		2,000,000		2,070,734
City & County of San Francisco CA Community Facilities DistrictNo. 2014-1 2.75%, due 9/1/23		650,000		644,235
City of San Francisco CA Public Utilities Commission Water Revenue 2.806%, due 11/1/23		2,000,000		1,996,080
Digital Realty Trust LP 3.95%, due 7/1/22 (c)		2,000,000		2,023,510
European Bank for Reconstruction & Development 0.875%, due 7/22/19 (b)		1,500,000		1,488,531
European Investment Bank 2.50%, due 10/15/24 (b)		2,000,000		1,989,264
European Investment Bank 2.125%, due 4/13/26 (b)		500,000		481,394
Fannie Mae Pool 1.76%, due 7/1/23		359,581		351,788

GREEN CENTURY BALANCED FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

continued


	PRINCIPAL AMOUNT		VALUE

Green and Sustainability Bonds, Renewable Energy & Energy Efficiency — (continued)
International Bank for Reconstruction & Development 2.125%, due 3/3/25 (b)	$	2,000,000	$	1,947,430
International Finance Corporation 2.125%, due 4/7/26 (b)		500,000		483,497
Kommunalbanken AS 1.375%, due 10/26/20 (b)(d)		2,000,000		1,957,614
Kommuninvest I Sverige AB 1.50%, due 4/23/19 (b)(d)		1,000,000		997,986
Korea Development Bank (The) 3.52% (LIBOR 3 Month+73 basis points), due 7/6/22 (b)(e)		1,250,000		1,252,353
Kreditanstalt fuer Wiederaufbau 1.75%, due 10/15/19 (b)		3,000,000		2,982,501
Kreditanstalt fuer Wiederaufbau 2.00%, due 11/30/21 (b)		1,000,000		984,906
National Australia Bank Ltd./New York 3.625%, due 6/20/23 (b)		2,000,000		2,023,662
Nederlandse Waterschapsbank NV 2.375%, due 3/24/26 (b)(d)		1,000,000		971,327
Nordic Investment Bank 2.25%, due 9/30/21 (b)		1,500,000		1,487,455
Overseas Private Investment Corporation 3.28%, due 9/15/29		770,596		778,662
Regency Centers LP 3.75%, due 6/15/24 (c)		2,000,000		1,991,538
Starbucks Corporation 2.45%, due 6/15/26 (c)		3,000,000		2,763,897
Sumitomo Mitsui Banking Corporation 2.45%, due 10/20/20 (b)		2,000,000		1,980,900
Svensk Exportkredit AB 1.875%, due 6/23/20 (b)		1,500,000		1,484,621

				41,821,518

U.S. Government Agencies — 5.2%
Federal Farm Credit Banks 1.80%, due 6/15/20		200,000		198,103


	PRINCIPAL AMOUNT		VALUE

U.S. Government Agencies — (continued)
Federal Farm Credit Banks 2.23%, due 11/15/22 (c)	$	1,500,000	$	1,481,243
Federal Farm Credit Banks 2.98%, due 3/13/23 (c)		3,000,000		3,000,429
Federal Farm Credit Banks 2.26%, due 11/13/24		500,000		487,695
Federal Farm Credit Banks 3.48%, due 9/22/25 (c)		500,000		500,019
Federal Home Loan Banks 3.89%, due 5/3/28 (c)		3,000,000		3,002,544
Federal Home Loan Mortgage Corporation 3.75%, due 3/27/19		500,000		501,042
Federal Home Loan Mortgage Corporation 0.00%, due 11/29/19		200,000		195,788
Federal National Mortgage Association 1.70%, due 1/27/20 (c)		3,000,000		2,972,568
Overseas Private Investment Corporation 3.33%, due 5/15/33		232,578		234,542
Overseas Private Investment Corporation 3.43%, due 6/1/33		225,441		229,251

				12,803,224

Community Development Financial Institutions — 3.4%
Capital Impact Partners 2.60%, due 12/15/22		2,000,000		1,945,802
Enterprise Community Loan Fund, Inc. 4.152%, due 11/1/28 (c)		3,000,000		2,971,527
Local Initiatives Support Corporation 3.782%, due 3/1/27 (c)		2,000,000		1,984,700
Reinvestment Fund, Inc. (The) 3.78%, due 2/15/26		1,400,000		1,411,025

				8,313,054

Media & Entertainment — 2.3%
International Business Machines Corporation 8.375%, due 11/1/19		500,000		520,632

GREEN CENTURY BALANCED FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

concluded


	PRINCIPAL AMOUNT		VALUE

Media & Entertainment — (continued)
Microsoft Corporation 1.10%, due 8/8/19	$	3,000,000	$	2,978,394
Oracle Corporation 5.00%, due 7/8/19		1,000,000		1,009,961
Oracle Corporation 2.50%, due 5/15/22 (c)		1,000,000		988,644

				5,497,631

Diversified Financials — 1.2%
Bank of New York Mellon Corporation (The) 3.55%, due 9/23/21 (c)		1,000,000		1,018,752
State Street Corporation 3.10%, due 5/15/23		2,000,000		1,994,004

				3,012,756

Banks — 1.1%
HSBC Holdings PLC 5.10%, due 4/5/21 (b)		1,500,000		1,564,029
JPMorgan Chase & Company 4.40%, due 7/22/20		1,000,000		1,020,479

				2,584,508

Pharmaceuticals & Biotechnology — 0.5%
Amgen, Inc. 5.70%, due 2/1/19		1,250,000		1,250,000

Real Estate — 0.4%
HCP, Inc. 3.875%, due 8/15/24 (c)		1,000,000		994,955

Telecommunication Services — 0.3%
America Movil SAB de C.V. 5.00%, due 10/16/19 (b)		750,000		760,184

Healthy Living — 0.2%
Whole Foods Market, Inc. 5.20%, due 12/3/25 (c)(d)		500,000		548,655

Total Bonds & Notes (Cost $78,037,298)				77,586,485


CERTIFICATES OF DEPOSIT — 0.1%
	PRINCIPAL AMOUNT		VALUE

Self-Help Credit Union 1.30%, due 6/21/19	$	95,000	$	94,563
Self-Help Federal Credit Union 1.40%, due 3/17/20		240,000		236,937

Total Certificates Of Deposit (Cost $335,000)				331,500

SHORT-TERM INVESTMENT — 3.3%
UMB Money Market Fiduciary Account , 0.25% (f) (Cost $8,060,966)				8,060,966

Total Short-term Investments (Cost $8,060,966)				8,060,966

TOTAL INVESTMENTS (g) — 99.7%
(Cost $198,196,505)				243,883,646
Other Assets Less Liabilities — 0.3%				688,622

NET ASSETS — 100.0%			$	244,572,268

(a)	Non-income producing security.

(b)	Securities whose values are determined or significantly influenced by trading in markets other than the United States or Canada.

(c)

Callable.

(d)	Security exempt from registration under Rule 144A of the Securities Act of 1933. These securities are restricted and may be resold in transactions exempt from registration normally to qualified institutional buyers. The total value of these securities is $X.

(e)	Floating rate bond. Rate shown is currently in effect at January 31, 2019.

(f)	The rate quoted is the annualizedseven-day yield of the fund at the period end.

(g)	The cost of investments for federal income tax purposes is $197,999,861 resulting in gross unrealized appreciation and depreciation of $48,742,824 and $2,859,039 respectively, or net unrealized appreciation of $45,883,785.

See Notes to Financial Statements

GREEN CENTURY EQUITY FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)


COMMON STOCKS — 100.0%
	SHARES		VALUE

Software & Services — 15.7%
Accenture PLC, Class A (a)		15,491	$	2,378,643
Adobe, Inc. (b)		11,870		2,941,624
ANSYS, Inc. (b)		2,060		338,561
Autodesk, Inc. (b)		5,312		781,926
Automatic Data Processing, Inc.		10,612		1,483,982
Cadence Design Systems, Inc. (b)		6,892		331,023
Citrix Systems, Inc.		3,290		337,357
Cognizant Technology Solutions Corporation, Class A		14,022		977,053
FleetCor Technologies, Inc. (b)		2,151		434,093
Fortinet, Inc. (b)		3,455		264,549
International Business Machines Corporation		22,086		2,968,800
Intuit, Inc.		5,905		1,274,417
Microsoft Corporation		176,374		18,418,737
Oracle Corporation		72,264		3,629,821
salesforce.com, Inc. (b)		17,423		2,647,773
Symantec Corporation		15,100		317,402
Teradata Corporation (b)		2,867		127,238
VMware, Inc., Class A		1,811		273,588
Western Union Company (The)		10,716		195,567
Workday, Inc., Class A (b)		3,542		642,979

				40,765,133

Media & Entertainment — 12.3%
Alphabet, Inc., Class A (b)		7,238		8,149,192
Alphabet, Inc., Class C (b)		7,625		8,512,321
Discovery, Inc., Class A (b)		3,695		104,864
Discovery, Inc., Class C (b)		7,381		196,704
Facebook, Inc., Class A (b)		58,385		9,732,196
John Wiley & Sons, Inc., Class A		1,187		61,463
Liberty Global PLC, Class A (a)(b)		4,470		109,068
Liberty Global PLC, Series C (a)(b)		12,679		298,717
New York Times Company (The), Class A		3,198		82,221
Omnicom Group, Inc.		5,454		424,757
Scholastic Corporation		689		28,724
Walt Disney Company (The)		36,017		4,016,616

				31,716,843

Pharmaceuticals & Biotechnology — 8.8%
AbbVie, Inc.		36,644		2,942,147
Agilent Technologies, Inc.		7,680		584,064
Amgen, Inc.		15,658		2,929,768


	SHARES		VALUE

Pharmaceuticals & Biotechnology — (continued)
Bio-Techne Corporation		898	$	156,665
Biogen, Inc. (b)		4,884		1,630,182
BioMarin Pharmaceutical, Inc. (b)		4,288		420,953
Bristol-Myers Squibb Company		39,555		1,952,830
Celgene Corporation (b)		17,059		1,509,039
Gilead Sciences, Inc.		31,432		2,200,554
IQVIA Holdings, Inc. (b)		3,939		508,170
Jazz Pharmaceuticals PLC (a)(b)		1,490		187,576
Merck & Company, Inc.		64,315		4,786,966
Mettler-Toledo International, Inc. (b)		611		389,916
Vertex Pharmaceuticals, Inc. (b)		6,198		1,183,260
Waters Corporation (b)		1,859		429,838
Zoetis, Inc.		11,700		1,008,072

				22,820,000

Capital Goods — 6.7%
3M Company		14,213		2,846,864
A.O. Smith Corporation		3,500		167,510
AGCO Corporation		1,614		103,619
Air Lease Corporation		2,383		90,411
Allegion PLC (a)		2,359		202,544
Applied Industrial Technologies, Inc.		898		52,991
Builders FirstSource, Inc. (b)		2,585		34,174
Caterpillar, Inc.		14,402		1,917,770
Cummins, Inc.		3,759		552,987
Deere & Company		7,409		1,215,076
Dover Corporation		3,627		318,559
Eaton Corporation PLC		10,549		804,361
EMCOR Group, Inc.		1,399		91,257
Fastenal Company		6,943		419,774
Flowserve Corporation		3,126		137,669
Fortive Corporation		7,295		547,052
Fortune Brands Home & Security, Inc.		3,383		153,250
Graco, Inc.		4,009		173,710
Granite Construction, Inc.		1,102		47,628
H&E Equipment Services, Inc.		741		19,837
HD Supply Holdings, Inc. (b)		4,286		179,755
Illinois Tool Works, Inc.		7,325		1,005,796
Ingersoll-Rand PLC		5,908		591,036
Lennox International, Inc.		898		205,893
Lincoln Electric Holdings, Inc.		1,503		129,919
Masco Corporation		7,472		242,168

GREEN CENTURY EQUITY FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

continued


	SHARES		VALUE

Capital Goods — (continued)
Meritor, Inc. (b)		1,997	$	41,298
Middleby Corporation (The) (b)		1,342		157,846
Owens Corning		2,649		138,781
PACCAR, Inc.		8,467		554,758
Parker-Hannifin Corporation		3,217		530,194
Quanta Services, Inc.		3,539		125,068
Rockwell Automation, Inc.		3,002		508,899
Roper Technologies, Inc.		2,499		707,867
Sensata Technologies Holding NV (b)		4,058		192,755
Snap-on, Inc.		1,382		229,398
Spirit AeroSystems Holdings, Inc.		2,554		213,004
Stanley Black & Decker, Inc.		3,701		467,954
Tennant Company		380		22,317
Timken Company (The)		1,626		69,251
United Rentals, Inc. (b)		2,042		255,781
W.W. Grainger, Inc.		1,164		343,834
WABCO Holdings, Inc. (b)		1,269		144,958
Wabtec Corporation		2,139		147,933
Wesco Aircraft Holdings, Inc. (b)		1,261		11,021
Xylem, Inc.		4,325		308,200

				17,422,727

Diversified Financials — 5.3%
Ally Financial, Inc.		10,368		270,190
American Express Company		17,667		1,814,401
Ameriprise Financial, Inc.		3,421		433,099
Bank of New York Mellon Corporation (The)		24,234		1,267,923
BlackRock, Inc.		2,902		1,204,562
Charles Schwab Corporation (The)		29,483		1,378,920
CME Group, Inc.		8,631		1,573,259
FactSet Research Systems, Inc.		938		205,075
Franklin Resources, Inc.		7,580		224,444
Intercontinental Exchange, Inc.		13,893		1,066,427
Invesco Ltd.		9,813		178,793
Legg Mason, Inc.		2,044		60,911
Moody’s Corporation		4,182		662,889
Northern Trust Corporation		5,151		455,657
S&P Global, Inc.		6,071		1,163,507
State Street Corporation		9,169		650,082
T. Rowe Price Group, Inc.		5,873		548,890
TD Ameritrade Holding Corporation		6,915		386,894


	SHARES		VALUE

Diversified Financials — (continued)
Voya Financial, Inc.		3,852	$	178,848

				13,724,771

Semiconductors — 5.2%
Advanced Micro Devices, Inc. (b)		22,315		544,709
Analog Devices, Inc.		9,038		893,497
Applied Materials, Inc.		23,904		934,168
Intel Corporation		111,612		5,259,157
Lam Research Corporation		3,810		646,100
Microchip Technology, Inc.		5,689		457,225
NVIDIA Corporation		14,001		2,012,644
Skyworks Solutions, Inc.		4,315		315,168
Texas Instruments, Inc.		23,535		2,369,504

				13,432,172

Healthcare Equipment & Services — 4.6%
ABIOMED, Inc. (b)		1,035		363,357
Align Technology, Inc. (b)		1,847		459,811
AmerisourceBergen Corporation		3,893		324,559
Becton, Dickinson and Company		6,481		1,616,750
Cardinal Health, Inc.		7,531		376,324
Centene Corporation (b)		4,971		649,063
Cerner Corporation (b)		7,186		394,583
Cigna Corporation		9,211		1,840,450
Cooper Companies, Inc. (The)		1,198		333,955
DENTSPLY SIRONA, Inc.		5,324		223,342
Edwards Lifesciences Corporation (b)		5,075		864,882
HCA Healthcare, Inc.		6,677		930,974
Henry Schein, Inc. (b)		3,714		288,578
Hologic, Inc. (b)		6,631		294,416
Humana, Inc.		3,341		1,032,336
IDEXX Laboratories, Inc. (b)		2,089		444,497
Laboratory Corporation of America Holdings (b)		2,483		346,006
MEDNAX, Inc. (b)		2,272		82,042
Patterson Companies, Inc.		2,040		45,472
Quest Diagnostics, Inc.		3,330		290,876
ResMed, Inc.		3,472		330,430
Select Medical Holdings Corporation (b)		2,671		41,721
Varian Medical Systems, Inc. (b)		2,193		289,542

				11,863,966

GREEN CENTURY EQUITY FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

continued


	SHARES		VALUE

Real Estate — 4.4%
American Tower Corporation		10,648	$	1,840,400
AvalonBay Communities, Inc.		3,349		646,089
Boston Properties, Inc.		3,747		494,117
CBRE Group, Inc., Class A (b)		7,791		356,438
Corporate Office Properties Trust		2,560		63,206
Digital Realty Trust, Inc.		4,983		539,858
Duke Realty Corporation		8,779		256,698
Equinix, Inc.		1,928		759,632
Equity Residential		8,941		648,759
Federal Realty Investment Trust		1,762		233,588
HCP, Inc.		11,454		361,259
Host Hotels & Resorts, Inc.		18,038		325,766
Iron Mountain, Inc.		6,636		246,859
Jones Lang LaSalle, Inc.		1,131		162,197
Liberty Property Trust		3,663		172,674
Macerich Company (The)		2,554		117,893
PotlatchDeltic Corporation		1,566		57,754
Prologis, Inc.		15,219		1,052,546
Realogy Holdings Corporation		2,896		51,404
SBA Communications Corporation, Class A (b)		2,786		508,529
Simon Property Group, Inc.		7,489		1,363,897
UDR, Inc.		6,390		279,563
Vornado Realty Trust		4,093		286,142
Weyerhaeuser Company		18,403		482,895

				11,308,163

Retailing — 4.0%
AutoNation, Inc. (b)		1,309		50,724
Best Buy Company, Inc.		6,088		360,653
Booking Holdings, Inc. (b)		1,151		2,109,564
Buckle, Inc. (The)		624		10,839
Caleres, Inc.		1,103		32,914
CarMax, Inc. (b)		4,319		253,871
Foot Locker, Inc.		2,812		157,163
GameStop Corporation, Class A		2,386		27,057
Gap, Inc. (The)		5,594		142,311
Kohl’s Corporation		4,084		280,530
LKQ Corporation (b)		7,654		200,688
Lowe’s Companies, Inc.		19,651		1,889,640
Netflix, Inc. (b)		10,542		3,579,009
Nordstrom, Inc.		2,814		130,598
Nutrisystem, Inc.		711		30,864
Office Depot, Inc.		11,823		34,878
Pool Corporation		967		144,963


	SHARES		VALUE

Retailing — (continued)
Shutterfly, Inc. (b)		755	$	34,700
Signet Jewelers Ltd.		1,442		35,127
Tiffany & Company		2,700		239,571
Tractor Supply Company		2,968		253,467
Ulta Beauty, Inc. (b)		1,371		400,222

				10,399,353

Food & Beverage — 4.0%
Archer-Daniels-Midland Company		13,555		608,620
Bunge Ltd.		3,388		186,577
Campbell Soup Company		4,475		158,549
Coca-Cola Company (The)		97,756		4,704,996
Darling Ingredients, Inc. (b)		3,841		81,698
General Mills, Inc.		14,417		640,692
Hormel Foods Corporation		7,000		296,240
Ingredion, Inc.		1,745		172,755
JM Smucker Company (The)		2,784		291,986
Kellogg Company		6,340		374,123
Kraft Heinz Company (The)		14,788		710,711
McCormick & Company, Inc.		2,952		364,985
Mondelez International, Inc., Class A		35,484		1,641,490

				10,233,422

Technology Hardware & Equipment — 3.8%
Cisco Systems, Inc.		113,866		5,384,723
Cognex Corporation		4,112		187,096
CommScope Holding Company, Inc. (b)		4,548		95,099
Corning, Inc.		19,732		656,286
Dell, Inc. (b)		3,551		172,543
F5 Networks, Inc. (b)		1,494		240,459
Flex Ltd. (b)		12,757		122,722
Hewlett Packard Enterprise Company		35,802		558,153
HP, Inc.		38,493		848,001
Motorola Solutions, Inc.		3,931		459,573
Plantronics, Inc.		821		31,847
TE Connectivity Ltd. (a)		8,411		680,870
Trimble, Inc. (b)		6,098		229,651
Xerox Corporation		5,488		154,817

				9,821,840

GREEN CENTURY EQUITY FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

continued


	SHARES		VALUE

Household & Personal Products — 3.6%
Avon Products, Inc. (a)(b)		11,136	$	26,058
Clorox Company (The)		3,084		457,604
Colgate-Palmolive Company		19,972		1,291,789
Estee Lauder Companies, Inc. (The), Class A		5,433		741,170
Kimberly-Clark Corporation		8,419		937,708
Procter & Gamble Company (The)		60,237		5,811,064

				9,265,393

Consumer Services — 3.3%
Aramark		5,923		195,163
Choice Hotels International, Inc.		854		67,603
Darden Restaurants, Inc.		3,016		316,469
Domino’s Pizza, Inc.		952		270,111
Hilton Worldwide Holdings, Inc.		6,843		509,667
Jack in the Box, Inc.		666		53,913
Marriott International, Inc., Class A		7,178		822,096
McDonald’s Corporation		18,779		3,357,309
Royal Caribbean Cruises Ltd.		4,036		484,522
Starbucks Corporation		32,626		2,223,135
Vail Resorts, Inc.		966		181,859

				8,481,847

Materials — 3.2%
Air Products & Chemicals, Inc.		5,314		873,568
Albemarle Corporation		2,598		209,737
Avery Dennison Corporation		2,153		224,881
Axalta Coating Systems Ltd. (b)		5,141		131,712
Ball Corporation		7,898		412,907
Compass Minerals International, Inc.		794		41,487
Domtar Corporation		1,582		74,196
Ecolab, Inc.		6,305		997,262
H.B. Fuller Company		1,174		57,984
International Flavors & Fragrances, Inc.		2,087		295,895
Linde PLC (a)		13,342		2,174,879
Minerals Technologies, Inc.		819		47,969
Mosaic Company (The)		8,835		285,194
Newmont Mining Corporation		12,919		440,667
PPG Industries, Inc.		5,852		617,035
Schnitzer Steel Industries, Inc., Class A		728		17,618
Sealed Air Corporation		3,821		150,929


	SHARES		VALUE

Materials — (continued)
Sherwin-Williams Company (The)		2,043	$	861,165
Sonoco Products Company		2,378		136,925
WestRock Company		6,270		255,252

				8,307,262

Insurance — 3.1%
Allstate Corporation (The)		8,340		732,836
Arthur J. Gallagher & Company		4,429		330,890
Chubb Ltd. (a)		11,215		1,492,156
Hartford Financial Services Group, Inc. (The)		8,722		409,236
Loews Corporation		6,564		314,416
Marsh & McLennan Companies, Inc.		12,233		1,078,828
Principal Financial Group, Inc.		6,952		348,087
Progressive Corporation (The)		14,088		947,981
Prudential Financial, Inc.		10,136		933,931
Travelers Companies, Inc. (The)		6,495		815,382
Willis Towers Watson PLC (a)		3,173		516,533

				7,920,276

Transportation — 2.9%
AMERCO		208		75,433
ArcBest Corporation		677		25,469
Avis Budget Group, Inc. (b)		1,577		42,011
C.H. Robinson Worldwide, Inc.		3,384		293,630
CSX Corporation		19,785		1,299,875
Delta Air Lines, Inc.		4,253		210,226
Echo Global Logistics, Inc. (b)		579		13,757
Expeditors International of Washington, Inc.		4,244		294,109
Genesee & Wyoming, Inc., Class A (b)		1,410		110,713
Hertz Global Holdings, Inc. (b)		1,307		21,683
Kansas City Southern		2,456		259,722
Ryder System, Inc.		1,241		71,866
Southwest Airlines Company		3,446		195,595
Union Pacific Corporation		17,884		2,844,808
United Parcel Service, Inc., Class B		16,794		1,770,088

				7,528,985

Banks — 2.3%
Bank of Hawaii Corporation		987		76,325
BB&T Corporation		18,829		918,855
Cathay General Bancorp		1,901		70,565

GREEN CENTURY EQUITY FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

continued


	SHARES		VALUE

Banks — (continued)
CIT Group, Inc.		2,743	$	126,699
Citizens Financial Group, Inc.		11,617		394,049
Comerica, Inc.		4,120		324,409
First Republic Bank		3,952		381,882
Heartland Financial USA, Inc.		746		33,838
International Bancshares Corporation		1,312		46,537
KeyCorp		25,619		421,945
M&T Bank Corporation		3,322		546,602
New York Community Bancorp, Inc.		11,571		134,455
Old National Bancorp		3,227		52,084
People’s United Financial, Inc.		9,194		150,598
PNC Financial Services Group, Inc. (The)		11,259		1,381,141
Regions Financial Corporation		26,884		407,830
Signature Bank		1,319		167,922
SVB Financial Group (b)		1,290		301,060
Umpqua Holdings Corporation		5,336		94,340

				6,031,136

Telecommunication Services — 2.3%
CenturyLink, Inc.		23,705		363,161
Cincinnati Bell, Inc. (b)		853		7,114
Sprint Corporation (b)		19,289		120,363
Verizon Communications, Inc.		100,051		5,508,808

				5,999,446

Consumer Durables & Apparel — 2.1%
Callaway Golf Company		2,170		35,349
Capri Holdings Ltd. (a)(b)		3,600		152,928
Columbia Sportswear Company		780		69,568
Deckers Outdoor Corporation (b)		666		85,548
Ethan Allen Interiors, Inc.		540		10,249
Garmin Ltd. (a)		2,792		193,151
Hanesbrands, Inc.		8,598		128,884
Hasbro, Inc.		2,940		266,246
La-Z-Boy, Inc.		1,083		32,078
Mattel, Inc. (b)		8,185		96,910
Meritage Homes Corporation (b)		916		41,293
Mohawk Industries, Inc. (b)		1,515		195,117
Newell Brands, Inc.		11,326		240,224
NIKE, Inc., Class B		31,024		2,540,245
PVH Corporation		1,861		203,054
Tupperware Brands Corporation		1,329		36,242


	SHARES		VALUE

Consumer Durables & Apparel — (continued)
Under Armour, Inc., Class A (b)		4,427	$	91,816
Under Armour, Inc., Class C (b)		4,607		87,257
VF Corporation		8,150		685,986
Whirlpool Corporation		1,547		205,767
Wolverine World Wide, Inc.		2,353		80,731

				5,478,643

Commercial & Professional Services — 0.8%
ACCO Brands Corporation		2,744		24,230
ASGN, Inc. (b)		1,253		78,926
Copart, Inc. (b)		5,095		257,960
Deluxe Corporation		1,123		52,747
Dun & Bradstreet Corporation (The)		913		132,148
Essendant, Inc.		801		10,253
Exponent, Inc.		1,265		63,199
Heidrick & Struggles International, Inc.		531		17,550
HNI Corporation		1,054		40,969
ICF International, Inc.		433		28,543
IHS Markit Ltd. (a)(b)		9,514		493,967
Interface, Inc.		1,437		23,581
Kelly Services, Inc.		787		17,629
Knoll, Inc.		1,268		25,563
ManpowerGroup, Inc.		1,569		123,998
Navigant Consulting, Inc.		1,017		26,361
R.R. Donnelley & Sons Company		1,494		7,619
Resources Connection, Inc.		605		10,110
Robert Half International, Inc.		2,951		190,133
Steelcase, Inc.		2,211		36,481
Team, Inc. (b)		585		8,389
Tetra Tech, Inc.		1,315		72,575
TransUnion		4,548		276,609
TrueBlue, Inc. (b)		978		23,853

				2,043,393

Renewable Energy & Energy Efficiency — 0.7%
Acuity Brands, Inc.		966		116,799
Itron, Inc. (b)		873		47,692
Johnson Controls International, PLC		22,463		758,575
Ormat Technologies, Inc.		870		50,208
Tesla, Inc. (b)		3,104		952,990

				1,926,264

GREEN CENTURY EQUITY FUND PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

concluded


	SHARES		VALUE

Automobiles & Components — 0.4%
Aptiv PLC (a)		6,475	$	512,367
Autoliv, Inc. (a)		2,085		166,487
BorgWarner, Inc.		4,994		204,255
Harley-Davidson, Inc.		3,979		146,666

				1,029,775

Food & Staples Retailing — 0.3%
Sysco Corporation		11,984		765,178

Utilities — 0.2%
American Water Works Company, Inc.		4,353		416,452

Healthy Living — 0.0%
Hain Celestial Group, Inc. (The) (b)		2,251		41,261
United Natural Foods, Inc. (b)		1,194		15,641

				56,902

Total Common Stocks (Cost $172,747,919)				258,759,342


SHORT-TERM INVESTMENT — 0.0%
UMB Money Market Fiduciary Account , 0.25% (c) (Cost $70,515)				70,515

Total Short-term Investments (Cost $70,515)				70,515

TOTAL INVESTMENTS (d) — 100.0%
(Cost $172,818,434)				258,829,857
Other Assets Less Liabilities — 0.0%				32,750

NET ASSETS — 100.0%			$	258,862,607

(a)	Securities whose values are determined or significantly influenced by trading in markets other than the United States or Canada.

(b)	Non-income producing security.

(c)	The rate quoted is the annualizedseven-day yield of the fund at the period end.

(d)	The cost of investments for federal income tax purposes is $177,190,630 resulting in gross unrealized appreciation and depreciation of $89,129,810 and $7,490,583 respectively, or net unrealized appreciation of $81,639,227.

See Notes to Financial Statements

GREEN CENTURY MSCI INTERNATIONAL INDEX PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)


COMMON STOCKS — 98.9%
	SHARES		VALUE


Japan — 22.1%
Aeon Company, Ltd.		10,000	$	203,522
Ajinomoto Company, Inc.		8,200		141,980
Asahi Kasei Corporation		20,400		223,837
Asics Corporation		2,900		41,978
Astellas Pharma, Inc.		29,600		439,212
Chugai Pharmaceutical Company, Ltd.		3,600		212,567
Daifuku Company, Ltd.		1,700		85,435
Daikin Industries Ltd.		3,900		422,140
Daiwa House Industry Company, Ltd.		9,100		295,034
Denso Corporation		7,200		331,176
Eisai Company, Ltd.		4,000		310,586
Fujitsu Ltd.		3,300		221,481
Hankyu Hanshin Holdings, Inc.		4,300		153,487
Honda Motor Company, Ltd.		25,500		765,560
Kao Corporation		7,700		544,378
KDDI Corporation		27,000		674,585
Kikkoman Corporation		2,400		127,680
Komatsu Ltd.		14,400		379,183
Kubota Corporation		16,000		253,665
Murata Manufacturing Company, Ltd.		2,800		420,604
Nintendo Company, Ltd.		1,700		515,590
Nippon Express Company, Ltd.		1,400		88,594
Nitto Denko Corporation		2,600		147,070
NTT DOCOMO, Inc.		20,400		490,147
Obayashi Corporation		11,700		111,329
Omron Corporation		3,400		139,632
Panasonic Corporation		34,600		338,811
Sekisui Chemical Company, Ltd.		7,400		114,859
Sekisui House Ltd.		11,600		173,367
Shimizu Corporation		10,300		87,655
Sompo Holdings, Inc.		5,400		203,603
Sony Corporation		19,400		972,075
Sumitomo Chemical Company, Ltd.		27,100		141,369
Sumitomo Metal Mining Company, Ltd.		3,900		112,799
Sumitomo Mitsui Trust Holdings, Inc.		5,700		215,912
Suntory Beverage & Food Ltd.		2,500		110,692
Sysmex Corporation		2,700		150,516
Tokyo Electron Ltd.		2,500		365,052


	SHARES		VALUE

Japan — (continued)
Tokyu Corporation		9,200	$	157,454
Toray Industries, Inc.		23,400		173,420
West Japan Railway Company		3,000		219,108
Yamaha Corporation		2,200		96,280
Yaskawa Electric Corporation		3,900		110,381
Yokogawa Electric Corporation		4,400		81,942

				11,565,747

Germany — 13.0%
adidas AG		2,857		679,773
Allianz SE		6,521		1,383,527
Beiersdorf AG		1,650		165,162
Deutsche Boerse AG		2,974		395,968
HeidelbergCement AG		2,394		165,772
Henkel AG & Company KGaA (a)		1,525		139,778
Henkel AG & Company KGaA		2,678		260,651
Merck KGaA		2,018		211,880
Muenchener Rueckversicherungs-Gesellschaft AG in Muenchen		2,243		500,530
SAP SE		14,930		1,543,783
Sartorius AG (a)		579		86,913
Siemens AG		11,613		1,275,035

				6,808,772

France — 11.7%
Atos SE		1,456		132,753
AXA SA		29,084		674,438
Bouygues SA		3,438		121,677
Cie Generale des Etablissements Michelin SCA		2,665		289,467
Danone SA		9,249		673,042
EssilorLuxottica SA		4,418		559,648
Gecina SA		686		100,813
Getlink		7,013		102,560
Kering		1,145		574,223
L’Oreal SA		3,844		926,466
Orange SA		30,640		475,220
Schneider Electric SE		8,251		586,803
Unibail-Rodamco-Westfield		2,075		373,179
Valeo SA		3,655		114,337
Vivendi SA		15,665		399,426

				6,104,052

Canada — 9.1%
Agnico Eagle Mines Ltd.		3,553		154,531

GREEN CENTURY MSCI INTERNATIONAL INDEX PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

continued


	SHARES		VALUE

Canada — (continued)
Bank of Montreal		9,860	$	721,716
Bank of Nova Scotia (The)		18,772		1,068,604
Canadian Imperial Bank of Commerce		6,865		582,062
Canadian National Railway Company		11,192		933,944
Canadian Tire Corporation Ltd., Class A		984		111,917
CGI Group, Inc. (b)		3,964		262,064
Gildan Activewear, Inc.		3,240		109,652
Lundin Mining Corporation		10,722		48,959
Metro, Inc.		3,652		132,767
Restaurant Brands International, Inc.		3,684		230,909
Rogers Communications, Inc., Class B		5,649		305,579
WSP Global, Inc.		1,803		92,538

				4,755,242

United Kingdom — 8.3%
Barratt Developments PLC		16,537		116,974
Berkeley Group Holdings PLC		2,088		102,810
BT Group PLC		128,718		392,519
Burberry Group PLC		6,652		157,252
Coca-Cola European Partners PLC		3,282		156,158
Croda International PLC		1,975		125,048
easyJet PLC		2,475		41,010
Investec PLC		10,208		65,618
ITV PLC		58,860		99,917
J Sainsbury PLC		30,061		112,567
Johnson Matthey PLC		3,127		124,927
Kingfisher PLC		33,899		99,034
Legal & General Group PLC		89,411		304,624
Marks & Spencer Group PLC		24,375		92,228
Mondi PLC		5,913		143,000
Pearson PLC		12,222		145,311
RELX PLC		30,455		674,588
Standard Chartered PLC		43,275		349,032
Unilever PLC		17,208		904,038
Wm Morrison Supermarkets PLC		33,735		103,745

				4,310,400

Switzerland — 8.2%
Coca-Cola HBC AG (b)		3,038		102,108
Givaudan SA		139		337,205


	SHARES		VALUE

Switzerland — (continued)
Kuehne + Nagel International AG		880	$	118,998
Lonza Group AG (b)		1,137		300,378
Roche Holding AG		10,157		2,701,989
Swiss Re AG		4,572		438,454
Swisscom AG		389		186,439
Vifor Pharma AG		758		96,469

				4,282,040

Australia — 6.3%
AMP Ltd.		43,990		72,529
ASX Ltd.		3,643		169,151
BlueScope Steel Ltd.		8,700		79,487
Boral Ltd.		18,710		67,688
Brambles Ltd.		25,609		198,699
Dexus		18,037		151,026
Goodman Group		26,481		225,378
GPT Group/The		31,652		133,835
Insurance Australia Group Ltd.		36,381		187,969
LendLease Group		9,295		82,784
Mirvac Group		63,452		111,254
Newcrest Mining Ltd.		11,862		211,035
Ramsay Health Care Ltd.		2,266		93,587
Stockland		41,264		113,738
Sydney Airport		19,337		92,301
Transurban Group		41,531		368,309
Westpac Banking Corporation		52,165		932,296

				3,291,066

Denmark — 3.7%
Coloplast A/S, Class B		1,859		169,818
Novo Nordisk A/S, Class B		27,609		1,293,926
Novozymes A/S		3,554		148,619
Pandora A/S		1,730		75,130
Vestas Wind Systems A/S		2,993		247,411

				1,934,904

Hong Kong — 2.8%
BOC Hong Kong Holdings Ltd.		59,500		229,902
Hang Seng Bank Ltd.		12,417		285,675
Hong Kong Exchanges & Clearing Ltd.		18,989		594,145
Hysan Development Company, Ltd.		14,000		72,853
MTR Corporation Ltd.		29,500		164,986

GREEN CENTURY MSCI INTERNATIONAL INDEX PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

continued


	SHARES		VALUE

Hong Kong — continued
Swire Properties Ltd.		23,400	$	91,334

				1,438,895

Spain — 2.4%
Banco Bilbao Vizcaya Argentaria SA		101,476		602,259
Ferrovial SA		7,883		176,769
Industria de Diseno Textil SA		16,679		466,548

				1,245,576

Italy — 1.6%
Assicurazioni Generali SpA		18,232		319,180
Intesa Sanpaolo SpA		223,519		511,431

				830,611

Sweden — 1.6%
Boliden AB		4,534		113,477
Essity AB, Class B		9,096		251,672
Skandinaviska Enskilda Banken AB, Class A		24,416		256,284
Skanska AB B Shares		5,103		89,354
Tele2 AB B Shares		8,071		101,043

				811,830

Singapore — 1.5%
Ascendas Real Estate Investment Trust		60,500		123,382
City Developments Ltd.		12,000		82,133
DBS Group Holdings Ltd.		28,449		507,033
Singapore Airlines Ltd.		10,100		72,558

				785,106

Ireland — 1.2%
CRH PLC (c)		51		1,468
CRH PLC (d)		12,847		369,782
Kerry Group PLC, Class A		2,491		254,343

				625,593

Netherlands — 1.2%
Akzo Nobel NV		3,370		289,998
CNH Industrial NV		15,512		152,457
STMicroelectronics NV		10,989		175,313

				617,768


	SHARES		VALUE

Belgium — 1.0%
KBC Group NV		3,819	$	259,263
Solvay SA		1,198		130,421
Umicore SA		3,388		143,230

				532,914

Jersey — 0.9%
Ferguson PLC		3,635		243,420
WPP PLC		19,335		221,270

				464,690

Norway — 0.8%
Norsk Hydro ASA		21,834		101,222
Orkla ASA		12,229		98,838
Telenor ASA		11,536		218,398

				418,458

Finland — 0.7%
UPM-Kymmene OYJ		8,459		245,656
Wartsila OYJ Abp		7,290		119,031

				364,687

New Zealand — 0.2%
Fletcher Building Ltd. (b)		16,479		56,950
Ryman Healthcare Ltd.		9,070		65,720

				122,670

Luxembourg — 0.2%
SES SA		5,859		119,410

Israel — 0.2%
Bank Hapoalim BM		16,679		113,052

Austria — 0.1%
voestalpine AG		2,034		64,996

Portugal — 0.1%
Jeronimo Martins SGPS SA		3,776		53,512

Total Common Stocks (Cost $52,912,961)				51,661,991

GREEN CENTURY MSCI INTERNATIONAL INDEX PORTFOLIO OF INVESTMENTS

January 31, 2019

(unaudited)

concluded


SHORT-TERM INVESTMENT — 0.6%
	VALUE

UMB Money Market Fiduciary Account , 0.25% (e) (Cost $311,114)	$	311,114

Total Short-term Investments (Cost $311,114)		311,114

TOTAL INVESTMENTS (f) — 99.5%
(Cost $53,224,075)		51,973,105
Other Assets Less Liabilities — 0.5%		254,637

NET ASSETS — 100.0%	$	52,227,742

(a)	Preference shares.

(b)	Non-income producing security.

(c)	Shares of this security are traded on the London Stock Exchange.

(d)	Shares of this security are traded on the Irish Stock Exchange.

(e)	The rate quoted is the annualizedseven-day yield of the fund at the period end.

(f)	The cost of investments for federal income tax purposes is $53,628,518 resulting in gross unrealized appreciation and depreciation of $2,754,331 and $4,409,744 respectively, or net unrealized depreciation of $1,655,413.

See Notes to Financial Statements

GREEN CENTURY FUNDS STATEMENTS OF ASSETS AND LIABILITIES

January 31, 2019

(unaudited)


	BALANCED FUND		EQUITY FUND		INTERNATIONAL INDEX FUND
ASSETS:
Investments, at value (cost $198,196,505, $172,818,434 and $53,224,075, respectively)	$	243,883,646	$	258,829,857	$	51,973,105
Foreign cash, at value (cost $51,547)		—		—		53,790
Receivables for:
Capital stock sold		677,258		117,212		68,708
Interest		580,482		212		58
Dividends		103,629		282,663		178,655

Total assets		245,245,015		259,229,944		52,274,316

LIABILITIES:
Payable for capital stock repurchased		373,114		112,167		—
Accrued expenses		299,633		255,170		46,574

Total liabilities		672,747		367,337		46,574

NET ASSETS	$	244,572,268	$	258,862,607	$	52,227,742

NET ASSETS CONSIST OF:
Paid-in capital (par value of $0.01 per share with unlimited number of shares authorized)	$	197,764,598	$	176,939,098	$	54,034,933
Net distributable earnings (accumulated deficit)		46,807,670		81,923,509		(1,807,191	)

NET ASSETS	$	244,572,268	$	258,862,607	$	52,227,742

NET ASSET VALUE PER SHARE PER CLASS:
Individual Investor Class Shares:
Net assets applicable to shares outstanding	$	244,572,268	$	218,366,078	$	18,689,713
Shares of beneficial interest issued and outstanding		9,234,233		5,285,185		1,770,229
Net asset value per share	$	26.49	$	41.32	$	10.56

Institutional Class Shares:
Net assets applicable to shares outstanding	$	—	$	40,496,529	$	33,538,029
Shares of beneficial interest issued and outstanding		—		979,970		3,174,874
Net asset value per share	$	—	$	41.32	$	10.56

See Notes to Financial Statements

GREEN CENTURY FUNDS STATEMENTS OF OPERATIONS

For the six months ended January 31, 2019

(unaudited)


	BALANCED FUND			EQUITY FUND			INTERNATIONAL INDEX FUND
INVESTMENT INCOME:
Interest income	$	1,068,243		$	1,003		$	282
Dividend and other income (net of $9,222, $0 and $44,336 foreign withholding taxes, respectively)		1,256,241			2,432,584			499,982

Total investment income		2,324,484			2,433,587			500,264

EXPENSES:
Administrative services fee		1,020,745			1,262,377			199,347
Investment advisory fee		799,379			299,943			68,763

Total expenses		1,820,124			1,562,320			268,110

NET INVESTMENT INCOME		504,360			871,267			232,154

NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized gain (loss) on:
Investments		1,027,158			867,120			(424,127	)
Foreign currency transactions		—			—			(3,436	)
Change in net unrealized appreciation (depreciation) on:
Investments		(1,339,229	)		(7,997,325	)		(3,293,999	)
Foreign currency translations		—			—			1,185

NET REALIZED AND UNREALIZED LOSS ON INVESTMENTS		(312,071	)		(7,130,205	)		(3,720,377	)

NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS	$	192,289		$	(6,258,938	)	$	(3,488,223	)

See Notes to Financial Statements

GREEN CENTURY FUNDS STATEMENTS OF CHANGES IN NET ASSETS


	BALANCED FUND						EQUITY FUND						INTERNATIONAL INDEX FUND
	FOR THE SIX MONTHS ENDED JANUARY 31, 2019 (UNAUDITED)			FOR THE YEAR ENDED JULY 31, 2018			FOR THE SIX MONTHS ENDED JANUARY 31, 2019 (UNAUDITED)			FOR THE YEAR ENDED JULY 31, 2018			FOR THE SIX MONTHS ENDED JANUARY 31, 2019 (UNAUDITED)			FOR THE YEAR ENDED JULY 31, 2018
INCREASE (DECREASE) IN NET ASSETS:
From operations:
Net investment income	$	504,360		$	605,329		$	871,267		$	1,298,891		$	232,154		$	761,399
Net realized gain (loss) on investments and foreign currency transactions		1,027,158			4,187,360			867,120			1,854,977			(427,563	)		149,525
Change in net unrealized appreciation (depreciation) on investments and foreign currency translations		(1,339,229	)		12,063,552			(7,997,325	)		29,117,667			(3,292,814	)		162,500

Net increase (decrease) in net assets resulting from operations		192,289			16,856,241			(6,258,938	)		32,271,535			(3,488,223	)		1,073,424

Dividends and distributions to shareholders:
Distributions¹
Individual Investor Class		(5,153,497	)					(3,883,452	)					(136,743	)
Institutional Class		—						(717,630	)					(280,904	)
From net investment income
Individual Investor Class					(465,630	)					(1,165,506	)					(281,782	)
Institutional Class					—						(71,333	)					(551,637	)
From net realized gains
Individual Investor Class					(2,807,871	)					(1,128,976	)					(30,723	)
Institutional Class					—						—						(52,139	)

Total dividends and distributions		(5,153,497	)		(3,273,501	)		(4,601,082	)		(2,365,815	)		(417,647	)		(916,281	)

Capital share transactions:
Proceeds from sales of shares
Individual Investor Class		18,599,240			35,948,771			16,872,682			57,834,330			4,261,616			13,677,715
Institutional Class		—			—			17,406,519			29,249,139			10,279,586			20,068,024
Reinvestment of dividends and distributions
Individual Investor Class		4,986,099			3,194,407			3,771,517			2,229,665			132,954			302,041
Institutional Class		—			—			561,537			45,798			279,259			600,880
Payments for shares redeemed
Individual Investor Class²		(21,117,656	)		(31,330,054	)		(5,851,719	)		(63,840,970	)		(2,881,902	)		(3,345,164	)
Institutional Class³		—			—			(25,625,038	)		(118,633	)		(6,489,455	)		(4,570,070	)

Net increase in net assets resulting from capital share transactions		2,467,683			7,813,124			7,135,498			25,399,329			5,582,058			26,733,426

Total increase (decrease) in net assets		(2,493,525	)		21,395,864			(3,724,522	)		55,305,049			1,676,188			26,890,569
NET ASSETS:
Beginning of period		247,065,793			225,669,929			262,587,129			207,282,080			50,551,554			23,660,985

End of period⁴	$	244,572,268		$	247,065,793		$	258,862,607		$	262,587,129		$	52,227,742		$	50,551,554

¹	The SEC eliminated the requirements to disclose components of distributions paid to shareholders in 2018.

²	Net of redemption fee proceeds (reversed)/received of $(36), $5,812, $(783), $16,057, $1,206 and $2,490, respectively.

³	Net of redemption fee proceeds received of $0, $0, $0, $218, $173 and $1,590, respectively.

⁴	For the year ended July 31, 2018, net assets included accumulated undistributed net investment income (loss) of $34,608, $54,133, $(55,647), respectively. The SEC eliminated the requirement to disclose undistributed net investment income (loss) in 2018.

See Notes to Financial Statements

GREEN CENTURY BALANCED FUND FINANCIAL HIGHLIGHTS


	FOR THE SIX MONTHS ENDED JANUARY 31, 2019			FOR THE YEARS ENDED JULY 31,
	(UNAUDITED)			2018			2017			2016			2015			2014
Net Asset Value, beginning of period	$	27.05		$	25.55		$	23.93		$	25.07		$	23.74		$	21.43

Income (loss) from investment operations:
Net investment income		0.06			0.07			0.08			0.02			0.01			0.09
Net realized and unrealized gain (loss) on investments		(0.05	)		1.79			2.05			(0.48	)		2.51			2.31

Total increase (decrease) from investment operations		0.01			1.86			2.13			(0.46	)		2.52			2.40

Less dividends:
Dividends from net investment income		(0.06	)		(0.05	)		(0.03	)		—			(0.02	)		(0.09	)
Distributions from net realized gains		(0.51	)		(0.31	)		(0.48	)		(0.68	)		(1.17	)		—

Total decrease from dividends		(0.57	)		(0.36	)		(0.51	)		(0.68	)		(1.19	)		(0.09	)

Net Asset Value, end of period	$	26.49		$	27.05		$	25.55		$	23.93		$	25.07		$	23.74

Total return		0.16	%(a)		7.32	%		9.07	%		(1.73	)%		10.84	%		11.20	%
Ratios/Supplemental data:
Net assets, end of period (in 000’s)	$	244,572		$	247,066		$	225,670		$	193,805		$	179,714		$	121,907
Ratio of expenses to average net assets		1.48	%(b)		1.48	%		1.48	%		1.48	%		1.48	%		1.48	%
Ratio of net investment income to average net assets		0.41	%(b)		0.25	%		0.31	%		0.10	%		0.03	%		0.44	%
Portfolio turnover		8	%(a)		18	%		26	%		24	%		30	%		42	%

(a)	Not annualized.

(b)	Annualized.

See Notes to Financial Statements

GREEN CENTURY EQUITY FUND INDIVIDUAL INVESTOR CLASS FINANCIAL HIGHLIGHTS


	FOR THE SIX MONTHS ENDED JANUARY 31, 2019			FOR THE YEARS ENDED JULY 31,
	(UNAUDITED)			2018			2017			2016			2015			2014
Net Asset Value, beginning of period	$	43.16		$	38.05		$	33.65		$	32.73		$	30.11		$	26.30

Income from investment operations:
Net investment income		0.13			0.22			0.27			0.27			0.20			0.19
Net realized and unrealized gain (loss) on investments		(1.22	)		5.28			4.84			1.27			2.96			3.79

Total increase (decrease) from investment operations		(1.09	)		5.50			5.11			1.54			3.16			3.98

Less dividends:
Dividends from net investment income		(0.11	)		(0.20	)		(0.22	)		(0.25	)		(0.19	)		(0.17	)
Distributions from net realized gains		(0.64	)		(0.19	)		(0.49	)		(0.37	)		(0.35	)		—

Total decrease from dividends		(0.75	)		(0.39	)		(0.71	)		(0.62	)		(0.54	)		(0.17	)

Net Asset Value, end of period	$	41.32		$	43.16		$	38.05		$	33.65		$	32.73		$	30.11

Total return		(2.38	)%(a)		14.52	%		15.42	%		4.83	%		10.54	%		15.16	%
Ratios/Supplemental data:
Net assets, end of period (in 000’s)	$	218,366		$	232,609		$	207,282		$	173,485		$	138,403		$	95,358
Ratio of expenses to average net assets		1.25	%(b)		1.25	%		1.25	%		1.25	%		1.25	%		1.25	%
Ratio of net investment income to average net assets		0.63	%(b)		0.53	%		0.76	%		0.89	%		0.68	%		0.72	%
Portfolio turnover		6	%(a)		18	%		17	%		19	%		13	%		32	%

(a)	Not annualized.

(b)	Annualized.

GREEN CENTURY EQUITY FUND INSTITUTIONAL CLASS FINANCIAL HIGHLIGHTS


	FOR THE SIX MONTHS ENDED JANUARY 31, 2019			FOR THE PERIOD APRIL 30, 2018 (COMMENCEMENT OF OPERATIONS) TO JULY 31, 2018
	(UNAUDITED)
Net Asset Value, beginning of period	$	43.16		$	40.86

Income from investment operations:
Net investment income		0.21			0.09
Net realized and unrealized gain (loss) on investments		(1.24	)		2.35

Total increase (decrease) from investment operations		(1.03	)		2.44

Less dividends:
Dividends from net investment income		(0.17	)		(0.14	)
Distributions from net realized gains		(0.64	)		—

Total decrease from dividends		(0.81	)		(0.14	)

Net Asset Value, end of period	$	41.32		$	43.16

Total return		(2.24	)%(a)		6.50	%(a)
Ratios/Supplemental data:
Net assets, end of period (in 000’s)	$	40,497		$	29,978
Ratio of expenses to average net assets		0.95	%(b)		0.95	%(b)
Ratio of net investment income to average net assets		0.93	%(b)		0.83	%(b)
Portfolio turnover		6	%(a)		18	%(a)

(a)	Not annualized.

(b)	Annualized.

See Notes to Financial Statements

GREEN CENTURY MSCI INTERNATIONAL INDEX FUND INDIVIDUAL INVESTOR CLASS FINANCIAL HIGHLIGHTS


	FOR THE SIX MONTHS ENDED JANUARY 31, 2019			FOR THE YEAR ENDED JULY 31, 2018			FOR THE PERIOD SEPTEMBER 30, 2016 (COMMENCEMENT OF OPERATIONS) TO JULY 31, 2017
	(UNAUDITED)
Net Asset Value, beginning of period	$	11.50		$	11.31		$	10.00

Income from investment operations:
Net investment income		0.04			0.17			0.10
Net realized and unrealized gain (loss) on investments		(0.90	)		0.24			1.31

Total increase (decrease) from investment operations		(0.86	)		0.41			1.41

Less dividends:
Dividends from net investment income		(0.03	)		(0.19	)		(0.10	)
Distributions from net realized gains		(0.05	)		(0.03	)		—

Total decrease from dividends		(0.08	)		(0.22	)		(0.10	)

Net Asset Value, end of period	$	10.56		$	11.50		$	11.31

Total return		(7.44	)%(a)		3.62	%		14.18	%(a)
Ratios/Supplemental data:
Net assets, end of period (in 000’s)	$	18,690		$	18,744		$	8,087
Ratio of expenses to average net assets		1.28	%(b)		1.28	%		1.28	%(b)
Ratio of net investment income to average net assets		0.76	%(b)		1.71	%		1.79	%(b)
Portfolio turnover		9	%(a)		28	%		13	%(a)

(a)	Not annualized.

(b)	Annualized.

GREEN CENTURY MSCI INTERNATIONAL INDEX FUND INSTITUTIONAL CLASS FINANCIAL HIGHLIGHTS


	FOR THE SIX MONTHS ENDED JANUARY 31, 2019			FOR THE YEAR ENDED JULY 31, 2018			FOR THE PERIOD SEPTEMBER 30, 2016 (COMMENCEMENT OF OPERATIONS) TO JULY 31, 2017
	(UNAUDITED)
Net Asset Value, beginning of period	$	11.50		$	11.31		$	10.00

Income from investment operations:
Net investment income		0.05			0.21			0.12
Net realized and unrealized gain (loss) on investments		(0.89	)		0.23			1.31

Total increase (decrease) from investment operations		(0.84	)		0.44			1.43

Less dividends:
Dividends from net investment income		(0.05	)		(0.22	)		(0.12	)
Distributions from net realized gains		(0.05	)		(0.03	)		—

Total decrease from dividends		(0.10	)		(0.25	)		(0.12	)

Net Asset Value, end of period	$	10.56		$	11.50		$	11.31

Total return		(7.31	)%(a)		3.90	%		14.36	%(a)
Ratios/Supplemental data:
Net assets, end of period (in 000’s)	$	33,538		$	31,808		$	15,574
Ratio of expenses to average net assets		0.98	%(b)		0.98	%		0.98	%(b)
Ratio of net investment income to average net assets		1.06	%(b)		2.01	%		2.09	%(b)
Portfolio turnover		9	%(a)		28	%		13	%(a)

(a)	Not annualized.

(b)	Annualized.

See Notes to Financial Statements

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

NOTE 1 — Organization and Significant Accounting Policies

Green Century Funds (the “Trust”) is a Massachusetts business trust which offers three separate series, the Green Century Balanced Fund (the “Balanced Fund”), the Green Century Equity Fund (the “Equity Fund”) and the Green Century MSCI International Index Fund (the “International Index Fund”), each a “Fund” and collectively, the “Funds”. The Trust is registered under the Investment Company Act of 1940, as amended (the “Act”), as anopen-end, diversified 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, the Equity Fund Individual Investor Share Class commenced operations on September 13, 1995, the Equity Fund Institutional Share Class commenced operations on April 30, 2018, and the Individual Investor Share Class and Institutional Share Class of the International Index Fund commenced operations on September 30, 2016.

The preparation of financial statements in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”) 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.

Each Fund is an investment company and accordingly follows the investment company accounting and reporting guidance of the Financial Accounting Standards Board (the “FASB”) Accounting Standard Codification Topic 946 “Financial Services—Investment Companies”.

The following is a summary of the Funds’ significant accounting policies:

(A)

Investment Valuation: Equity securities listed on U.S. national securities exchanges other than NASDAQ are valued at last sale price. If a last sale price is not available, securities listed on U.S. national exchanges other than NASDAQ are valued at the mean between the closing bid and closing ask prices. NASDAQ National Market^®and SmallCap^SMsecurities are valued at the NASDAQ Official Closing Price (“NOCP”). The NOCP is based on the last traded price if it falls within the concurrent best bid and ask prices and is normalized pursuant to NASDAQ’s published procedures if it falls outside this range. If a NOCP is not available for any such security, the security is valued at the last sale price, or, if there have been no sales that day, at the mean between the closing bid and closing ask prices. Unlisted U.S. equity securities are valued at last sale price, or when last sale prices are not available, at the last quoted bid price. Debt securities (other than certificates of deposit and short-term obligations maturing in sixty days or less) are valued on the basis of valuations furnished by a pricing service which takes into account appropriate factors such asinstitution-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 orover-the-counter prices. Securities, if any, for which there are no such valuations or quotations available, or for which the market quotation or valuation provided by a pricing service is deemed not reliable, are valued at fair value by management as determined in good faith under guidelines established by the Trustees. Certificates of deposit are valued at cost plus accrued interest, and short-term obligations maturing in sixty days or less are valued at amortized cost, both of which approximate market value.

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

continued

Fornon-U.S. securities traded in foreign markets, the International Index Fund uses a fair value model developed by an independent pricing service to assist in valuing those securities. If an event occurs after the time at which the market for foreign securities held by the Fund closes but before the time that the Fund’s next NAV is calculated, such event may cause the closing price on the foreign exchange to not represent the readily available reliable market value quotation for such securities at the time the Fund determines its NAV. In such a case, the Fund will use the fair value of such securities as determined under the Fund’s valuation procedures. Events after the close of trading on a foreign market that could require a Fund to fair value some or all of its foreign securities include, among others, securities trading in the U.S. and other markets, corporate announcements, natural and other disasters, and political and other events. Among other elements of analysis in the determination of a security’s fair value, the Board has authorized the use of one or more independent research services to assist with such determinations. An independent research service may use statistical analyses and quantitative models to help determine fair value as of the time the Fund calculates its NAV. There can be no assurance that such models accurately reflect the behavior of the applicable markets or the effect of the behavior of such markets on the fair value of securities, or that such markets will continue to behave in a fashion that is consistent with such models. Unlike the closing price of a security on an exchange, fair value determinations employ elements of judgment. Consequently, the fair value assigned to a security may not represent the actual value that the Fund could obtain if it were to sell the security at the time of the close of the NYSE. Pursuant to procedures adopted by the Board, the Fund is not obligated to use the fair valuations suggested by any research service, and valuation recommendations provided by such research services may be overridden if other events have occurred or if other fair valuations are determined in good faith to be more accurate. Unless an event is such that it causes the Fund to determine that the closing prices for one or more securities do not represent readily available reliable market value quotations at the time the Fund determines its NAV, events that occur between the time of the close of the foreign market on which they are traded and the close of regular trading on the NYSE will not be reflected in the Fund’s NAV.

Various inputs are used in determining the value of the Fund’s investments. These inputs are summarized in the three broad levels listed below:

Level 1 — quoted prices for active markets for identical securities. An active market for the security is a market in which transactions occur with sufficient frequency and volume to provide pricing information on an ongoing basis. A quoted price in an active market provides the most reliable evidence of fair value.

Level 2 — other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.). Examples of level 2 inputs include 1) quoted prices for identical or similar assets in markets that are not active 2) investments valued at amortized cost and 3) investments valued with inputs that are derived principally from or corroborated by observable market data. An adjustment to any observable input that is significant to the fair value may render the measurement a Level 3 measurement.

Level 3 — significant unobservable inputs, including the Funds’ own assumptions in determining the fair value of investments.

In some cases, the inputs used to measure the fair value of an asset or a liability might be categorized within different levels of the fair value hierarchy. In those cases, the fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

continued

The following is a summary of the inputs used to value the Balanced Fund’s net assets as of January 31, 2019:


	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
COMMON STOCKS		$157,904,695		$ —		$ —		$157,904,695
BONDS & NOTES		—		77,586,485		—		77,586,485
CERTIFICATES OF DEPOSIT		—		331,500		—		331,500
SHORT-TERM OBLIGATIONS		—		8,060,966		—		8,060,966

TOTAL		$157,904,695		$85,978,951		$ —		$243,883,646

The following is a summary of the inputs used to value the Equity Fund’s net assets as of January 31, 2019:


	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
COMMON STOCKS	$	258,759,342	$	—	$	—	$	258,759,342
SHORT-TERM OBLIGATIONS		—		70,515		—		70,515

TOTAL	$	258,759,342	$	70,515	$	—	$	258,829,857

The following is a summary of the inputs used to value the International Index Fund’s net assets as of January 31, 2019:


	LEVEL 1		LEVEL 2		LEVEL 3		TOTAL
COMMON STOCKS
JAPAN	$	—	$	11,565,747	$	—	$	11,565,747
GERMANY		—		6,808,772		—		6,808,772
FRANCE		—		6,104,052		—		6,104,052
CANADA		4,755,242		—		—		4,755,242
UNITED KINGDOM		156,158		4,154,242		—		4,310,400
SWITZERLAND		—		4,282,040		—		4,282,040
AUSTRALIA		—		3,291,066		—		3,291,066
DENMARK		—		1,934,904		—		1,934,904
HONG KONG		—		1,438,895		—		1,438,895
SPAIN		—		1,245,576		—		1,245,576
ITALY		—		830,611		—		830,611
SWEDEN		—		811,830		—		811,830
SINGAPORE		—		785,106		—		785,106
IRELAND		—		625,593		—		625,593
NETHERLANDS		—		617,768		—		617,768
BELGIUM		—		532,914		—		532,914
JERSEY		—		464,690		—		464,690
NORWAY		—		418,458		—		418,458
FINLAND		—		364,687		—		364,687
NEW ZEALAND		56,950		65,720		—		122,670
LUXEMBOURG		—		119,410		—		119,410
ISRAEL		—		113,052		—		113,052
AUSTRIA		—		64,996		—		64,996
PORTUGAL		—		53,512		—		53,512

TOTAL COMMONS STOCKS		4,968,350		46,693,641		—		51,661,991

SHORT-TERM OBLIGATIONS		—		311,114		—		311,114

TOTAL	$	4,968,350	$	47,004,755	$	—	$	51,973,105

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

continued

There were no transfers into or out of Level 3 during the reporting period.

(B)

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, including amortization of premiums and accretion of discounts on bonds, is recognized on the accrual basis and dividend income is recorded onex-dividend date. Income, expenses and realized and unrealized gains and losses on investments are allocated to each class of shares in proportion to their relative shares outstanding.

(C)

Options Transactions: The Balanced Fund may utilize options to hedge or protect from adverse movements in the market values of its portfolio securities and to enhance return. The Equity Fund and the International Index Fund are authorized to utilize options to hedge against possible increases in the value of securities which are expected to be purchased by the Equity Fund or the International Index Fund or possible declines in the value of securities which are expected to be sold by the Equity Fund or the International Index Fund. The use of options involves risk such as the possibility of illiquid markets or imperfect correlation between the value of the option and the underlying securities. The Funds are also authorized to write put and call options. Premiums received upon writing put or call options are recorded as an asset with a corresponding liability which is subsequently adjusted to the current market value of the option. Changes between the initial premiums received and the current market value of the options are recorded as unrealized gains or losses. When an option is closed, expired or exercised, a gain or loss is realized and the liability is eliminated. The Funds continue to bear the risk of adverse movements in the price of the underlying assets during the period of the option, although any potential loss during the period would be reduced by the amount of the option premium received. As required by the Act, liquid securities are designated as collateral in an amount equal to the market value of open options contracts. In the six months ended January 31, 2019, neither the Balanced Fund, the Equity Fund nor the International Index Fund utilized options or wrote put or call options.

(D)

Repurchase Agreements: The Funds may enter into repurchase agreements with selected banks or broker-dealers that are deemed by the Funds’ adviser to be creditworthy pursuant to guidelines established by the Board of Trustees. Each repurchase agreement is recorded at cost, which approximates fair value. The Funds require that the market value of collateral, represented by securities (primarily U.S. Government securities), be sufficient to cover payments of interest and principal, and that the collateral be maintained in a segregated account with a custodian bank in a manner sufficient to enable the Funds to obtain those securities in the event of a default of the counterparty. In the event of default or bankruptcy by the counterparty to the repurchase agreement, retention of the collateral may be subject to legal proceedings. As of January 31, 2019, neither the Balanced Fund, the Equity Fund, nor the International Index Fund held repurchase agreements.

(E)

Currency Translation and Contracts: Securities and other assets and liabilities denominated in foreign currencies are translated into U.S. dollar amounts on the date of valuation. Purchases and sales of securities, and income and expense items denominated in foreign currencies, are translated into U.S. dollar amounts on the respective dates of such transactions. Occasionally, events impact the availability or reliability of foreign exchange rates used to convert the U.S. dollar equivalent value. If such an event occurs, the foreign exchange rate will be valued at fair value using procedures established and approved by the Board of Trustees. The Funds do not separately report the effect of fluctuations in foreign exchange rates from changes in market prices on securities held. Such fluctuations are included with the net realized and unrealized gain or loss from investments. Realized foreign exchange gains or losses arise from sales of foreign currencies, currency gains or losses realized between the trade and settlement dates on securities transactions, and the difference between the recorded amounts of dividends, interest, and foreign withholding taxes and the U.S. dollar equivalent of

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

continued

the amounts actually received or paid. Net unrealized foreign exchange gains and losses arise from changes in fair value of assets and liabilities other than investments in securities held at the end of the reporting period, resulting from changes in exchange rates. When a Fund purchases or sells foreign securities, it enters into foreign exchange contracts to minimize foreign exchange risk from the trade date to the settlement date of the transactions. A foreign exchange contract is an agreement between two parties to exchange different currencies at an agreed-upon exchange rate on a specified date. The International Index Fund had no open foreign currency spot contracts outstanding as of January 31, 2019.

(F)

Distributions: Distributions to shareholders are recorded on theex-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 U.S. GAAP. To the extent that these differences are attributable to permanent book and tax accounting differences, the components of net assets have been adjusted.

(G)

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 (“RICs”). Accordingly, no provisions for Federal income or excise tax are necessary.

Accounting for Uncertainty in Income Taxes addresses the accounting for uncertainty in income taxes and establishes for all entities, including pass-through entities such as the Funds, a minimum threshold for financial statement recognition of the benefit of positions taken in filing tax returns (including whether an entity is taxable in a particular jurisdiction). The Funds recognize tax benefits only if it is more likely than not that a tax position (including the Funds’ assertion that their income is exempt from tax) will be sustained upon examination. The Funds had no material uncertain tax positions and have not recorded a liability for unrecognized tax benefits as of January 31, 2019. Also, the Funds had recognized no interest and penalties related to uncertain tax benefits through January 31, 2019. At January 31, 2019, the tax years 2015 through 2018 remain open to examination by the Internal Revenue Service.

(H)

Redemption Fee: A 2.00% redemption fee is retained by the Funds to offset the effect of transaction costs and other expenses associated with short-term investing. The fee is imposed on redemptions or exchanges of shares held 60 days or less from their purchase date. For the six months ended January 31, 2019, the Balanced Fund, Equity Fund and International Index Fund (reversed)/received $(36), $(783) and $1,379 respectively, in redemption fees. Redemption fees are recorded as an adjustment topaid-in capital.

(I)

Indemnification: The Funds’ organizational documents provide that trustees and officers are indemnified against certain liabilities arising out of the performance of their duties to the Funds. In the normal course of business, the Funds may also enter into contracts that provide general indemnifications. The Funds’ maximum exposure under these arrangements is unknown as this would be dependent on future claims that may be made against the Funds. The risk of material loss from such claims is considered remote. As of January 31, 2019, no liability has been accrued.

(J)

Offsetting of Assets and Liabilities: As of January 31, 2019, there are no master netting arrangements related to the Funds. The Funds’ Statements of Assets and Liabilities present derivative instruments on a gross basis, if applicable. As of January 31, 2019, no derivative instruments were held by the Funds.

NOTE 2 — Transactions With Affiliates

(A)

Investment Adviser: Green Century Capital Management, Inc. (“Green Century”) is the adviser (“the Adviser”) for the Funds. Green Century is owned by Paradigm Partners. Green Century oversees the portfolio

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

continued

management of the Funds on aday-to-day basis. Effective February 1, 2018, Green Century and the Funds on behalf of the Balanced Fund entered into a contractual investment advisory fee waiver agreement pursuant to which Green Century agrees to waive that portion of the fee to which it is otherwise entitled under the Advisory Agreement between Green Century and the Funds with respect to the Balanced Fund, so that Green Century’s investment advisory fee with respect to the Fund shall be equal on an annual basis to 0.65% of the average daily net assets of the Fund up to $250 million and 0.60% of the value of the average daily net assets of the Fund in excess of $250 million, accrued daily and paid monthly. Effective November 28, 2018, the Balanced Fund’s Advisory Agreement was amended to reflect the same reduction in the advisory fee that was stipulated in the fee waiver agreement. Prior to February 1, 2018, the Balanced Fund paid Green Century a fee, accrued daily and paid monthly, at an annual rate of 0.65% of the average daily net assets of the Fund. The Equity Fund pays Green Century a fee, accrued daily and paid monthly, at an annual rate of 0.25% of the Equity Fund’s average daily net assets up to but not including $100 million, 0.22% of average daily net assets including $100 million up to but not including $500 million, 0.17% of average daily net assets including $500 million up to but not including $1 billion and 0.12% of average daily net assets equal to or in excess of $1 billion. The International Index Fund pays Green Century a fee, accrued daily and paid monthly, at an annual rate of 0.28% of the International Index Fund’s average daily net assets.

(B)

Subadvisers: Trillium Asset Management, LLC (“Trillium”) is the subadviser for the Balanced Fund. Effective February 1, 2018, Green Century, Trillium, and the Funds on behalf of the Balanced Fund entered into a contractual investment subadvisory fee waiver agreement pursuant to which Trillium agreed to waive that portion of the fee to which it is otherwise entitled under the Subadvisory Agreement between Green Century, Trillium and the Funds with respect to the Balanced Fund, so that Trillium’s investment subadvisory fee with respect to the Fund shall be equal on an annual basis to 0.40% of the value of the average daily net assets of the Fund up to $30 million, 0.35% of the value of the average daily net assets of the Fund in excess of $30 million up to $250 million, and 0.30% of the value of the average daily net assets of the Fund in excess of $250 million. Effective November 28, 2018, the Balanced Fund’s Subadvisory Agreement was amended to reflect the same reduction in the subadvisory fee that was stipulated in the fee waiver agreement. Prior to February 1, 2018, Trillium was paid a fee by the Adviser at an annual rate of 0.40% on the first $30 million of average daily net assets and 0.35% on average daily net assets in excess of $30 million for its services. For the six months ended January 31, 2019, Green Century accrued fees of $438,026 to Trillium. Northern Trust Investments, Inc. (“Northern Trust”) is the subadviser for the Equity Fund and International Index Fund. For the Equity Fund, Northern Trust is paid a fee by the Adviser based on Northern Trust’s fee schedule of the greater of $75,000 or 0.10% of the value of the average daily net assets of the Fund up to but not including $50 million, 0.05% of the average daily net assets of the Fund from and including $50 million up to but not including $100 million and 0.03% of the average daily net assets of the Fund equal to or in excess of $100 million for its services. For the International Index Fund, Northern Trust is paid a fee by the Adviser based on Northern Trust’s fee schedule of the greater of $100,000 or 0.17% of the value of the average daily net assets of the Fund up to but not including $50 million, 0.12% of the average daily net assets of the Fund from and including $50 million up to but not including $100 million and 0.08% of the average daily net assets of the Fund equal to or in excess of $100 million for its services. For the six months ended January 31, 2019, Green Century accrued fees of $61,529 and $50,411 to Northern Trust for the Equity Fund and the International Index Fund, respectively.

(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; interest; taxes; brokerage costs and other capital expenses; expenses of

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

continued

non-interested trustees (including counsel fees) and any extraordinary expenses. The Balanced Fund pays Green Century a fee at a rate such that immediately following any payment to the Administrator, the total operating expenses of the Fund, on an annual basis, do not exceed 1.48% of the Fund’s average daily net assets up to but not including $250 million and 1.43% of the Fund’s average daily net assets equal to and in excess of $250 million. The Equity Fund pays Green Century a fee at a rate such that immediately following any payment to the Administrator, the total operating expenses of the Fund, on an annual basis, do not exceed 1.25% of the Fund’s Individual Investor Class average daily net assets, and 0.95% of the Fund’s Institutional Class average daily net assets. The International Index Fund pays Green Century a fee at a rate such that immediately following any payment to the Administrator, the total operating expenses of the Fund, on an annual basis, do not exceed 1.28% of the Fund’s Individual Investor Class average daily net assets, and 0.98% of the Fund’s Institutional Class average daily net assets.

(D)

Subadministrator: Pursuant to a Subadministrative and Fund Accounting Services Agreement with the Administrator, UMB Fund Services, Inc. (“UMBFS”) as Subadministrator and Fund Accountant, is responsible for conducting fund accounting and certainday-to-day administration of the Trust subject to the supervision and direction of the Administrator. For the six months ended January 31, 2019, Green Century accrued fees of $74,298, $92,847, and $47,522 to UMBFS related to services performed on behalf of the Balanced Fund, the Equity Fund, and the International Index Fund, respectively.

(E)

Index Agreements: The Equity Fund invests in the securities of the companies included in the MSCI KLD 400 Social ex Fossil Fuels Index (the “KLD Index”). The Index is owned and maintained by MSCI ESG Research (“MSCI”). For the use of the KLD Index for the Equity Fund, MSCI is paid by the Adviser an annual license fee of $26,000, plus the greater of $26,000 or at an annual rate of 0.05% on the first $100 million of average daily net assets, 0.04% on the next $100 million of average daily net assets, and 0.03% on average daily net assets in excess of $200 million. The International Index Fund invests in the securities included in the MSCI World ex USA SRI ex Fossil Fuels Index (the “World Index”). The Index is owned and maintained by MSCI. For the use of the World Index for the International Index Fund, MSCI is paid by the Adviser an annual license fee of $16,000, plus the greater of $25,000 or at an annual rate of 0.05% on the first $100 million of average daily net assets, 0.04% on the next $100 million of average daily net assets, and 0.03% on average daily net assets in excess of $200 million. For the six months ended January 31, 2019, Green Century accrued fees of $67,074 and $20,668 to MSCI for the Equity Fund and International Index Fund, respectively.

NOTE 3 — Investment Transactions

For the six months ended January 31, 2019, the Balanced Fund’s cost of purchases and proceeds from sales of securities, other than short-term securities, aggregated $18,552,185 and $24,373,976 respectively. The Equity Fund’s cost of purchases and proceeds from sales of securities, other than short-term securities, aggregated $19,781,840 and $15,770,789, respectively. The International Index Fund’s cost of purchases and proceeds from sales of securities, other than short-term securities, aggregated $9,690,710 and $4,533,305, respectively.

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

continued

NOTE 4 — Federal Income Tax Information

The tax basis of the components of distributable net earnings (deficit) at July 31, 2018 were as follows:


	BALANCED FUND		EQUITY FUND		INTERNATIONAL INDEX FUND
Undistributed ordinary income	$	576,130	$	1,179,576	$	17,201
Undistributed long-term capital gains		4,012,498		1,433,503		226,017

Tax accumulated earnings		4,588,628		2,613,079		243,218

Accumulated capital and other losses		—		—		—
Unrealized appreciation (depreciation)		47,180,250		90,170,450		1,856,431
Foreign currency translations		—		—		(970	)

Distributable net earnings (deficit)	$	51,768,878	$	92,783,529	$	2,098,679

The tax character of distributions paid during the fiscal year ended July 31, 2018 and the period ended July 31, 2017 were as follows:


	BALANCED FUND				EQUITY FUND
	YEAR ENDED JULY 31, 2018		YEAR ENDED JULY 31, 2017		YEAR ENDED JULY 31, 2018		YEAR ENDED JULY 31, 2017
Ordinary income	$	1,805,215	$	694,269	$	1,490,368	$	1,131,540
Long-term capital gains		1,468,286		3,507,239		875,447		2,567,630

	INTERNATIONAL INDEX FUND
	YEAR ENDED JULY 31, 2018		PERIOD ENDED JULY 31, 2017
Ordinary income	$	916,281	$	191,692
Long-term capital gains		—		—

NOTE 5 — Capital Share Transactions

Capital Share transactions for the Balanced Fund, the Equity Fund and the International Index Fund were as follows:


	BALANCED FUND			BALANCED FUND
	SIX MONTHS ENDED JANUARY 31, 2019			YEAR ENDED JULY 31, 2018
Shares sold		700,340			1,368,015
Reinvestment of dividends		199,524			121,135
Shares redeemed		(798,085	)		(1,189,813	)

		101,779			299,337

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

continued


	EQUITY FUND INDIVIDUAL INVESTOR CLASS			EQUITY FUND INDIVIDUAL INVESTOR CLASS
	SIX MONTHS ENDED JANUARY 31, 2019			YEAR ENDED JULY 31, 2018
Shares sold		407,457			1,432,689
Reinvestment of dividends		99,276			54,138
Shares redeemed		(611,249	)		(1,544,874	)

		(104,516	)		(58,047	)


	EQUITY FUND INSTITUTIONAL CLASS			EQUITY FUND INSTITUTIONAL CLASS
	SIX MONTHS ENDED JANUARY 31, 2019			PERIOD ENDED JULY 31, 2018
Shares sold		412,731			696,290
Reinvestment of dividends		14,781			1,099
Shares redeemed		(142,121	)		(2,810	)

		285,391			694,579


	INTERNATIONAL INDEX INDIVIDUAL INVESTOR CLASS			INTERNATIONAL INDEX INDIVIDUAL INVESTOR CLASS
	SIX MONTHS ENDED JANUARY 31, 2019			YEAR ENDED JULY 31, 2018
Shares sold		398,470			1,173,479
Reinvestment of dividends		13,457			26,688
Shares redeemed		(272,050	)		(285,075	)

		139,877			915,092


	INTERNATIONAL INDEX INSTITUTIONAL CLASS			INTERNATIONAL INDEX INSTITUTIONAL CLASS
	SIX MONTHS ENDED JANUARY 31, 2019			YEAR ENDED JULY 31, 2018
Shares sold		985,770			1,728,175
Reinvestment of dividends		28,265			53,083
Shares redeemed		(604,676	)		(393,058	)

		409,359			1,388,200

NOTE 6 — New Accounting Pronouncements

The FASB issued Accounting Standards UpdateNo. 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement (“ASU2018-13”) which includes amendments intended to improve the effectiveness of disclosures in the notes to financial statements which includes additional disclosure requirements regarding the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and clarifications to the narrative description of measurement uncertainty

GREEN CENTURY FUNDS NOTES TO FINANCIAL STATEMENTS

(unaudited)

concluded

disclosures. ASU2018-13 is effective for interim and annual periods beginning after December 15, 2019 but allowed for immediate adoption of these provisions. Management elected to early adopt only those provisions related to the elimination of certain disclosures and is currently evaluating the impact that ASU2018-13 will have on the Fund’s financial statements and related disclosures for the remaining provisions.

NOTE 7 — Subsequent Events

Subsequent to January 31, 2019 and through the date on which the financial statements were available for issuance, management has evaluated subsequent events requiring disclosure.

There were no other events requiring accrual or disclosure.

BOARD OF TRUSTEES’ CONSIDERATION OF ADVISORY AND SUBADVISORY AGREEMENTS

The Board of Trustees of the Green Century Funds considered and approved the continuance of three advisory and subadvisory agreements.

INVESTMENT ADVISORY AGREEMENTS WITH GREEN CENTURY CAPITAL MANAGEMENT, INC.

The Board, including the Independent Trustees, voted to approve the continuance of the Investment Advisory Agreements (the “Advisory Agreements”) between the Trust, on behalf of each of the Balanced Fund, the Equity Fund, and the International Fund and Green Century Capital Management (“Green Century” or the “Adviser”) at a meeting on November 13, 2018. The Trustees considered, among other things, information provided by Green Century regarding the investment performance of each Fund; the expenses of each Fund and the advisory fee paid to Green Century by each Fund; and the profitability to Green Century of its advisory relationship with each Fund. The Independent Trustees were assisted by independent counsel in considering these materials and the approval and continuance of the Advisory Agreements. The Trustees considered all of the information provided to them by Green Century, including information provided throughout the year. The Trustees also received a memorandum from independent legal counsel advising them of their duties and responsibilities in connection with the review of the Advisory Agreements. They took into account a proposal by Green Century to amend the Advisory Agreement for the Balanced Fund to reduce the investment advisory fee by 0.05% or 5 basis points per annum on average daily net assets of the Fund in excess of $250 million (the “Proposed Advisory Agreement Amendment”). In approving the Advisory Agreements, including the Proposed Advisory Agreement Amendment, the Board, including the Independent Trustees, did not identify any single factor as determinative. Matters considered in connection with their approval of the Advisory Agreements included the following.

Nature, Quality, and Extent of Services Performed. The Trustees considered the scope and quality of the services performed for each of the Funds by the Adviser, including the resources dedicated by the Adviser.

With respect to the Balanced Fund, the services performed include the oversight and monitoring of the portfolio management and performance of the Balanced Fund; monitoring the implementation of the Balanced Fund’s environmental screens; implementing the environmental and other policies of the Trust by voting the Balanced Fund’s shareholder proxies; and overall compliance oversight provided by the Adviser. The Trustees also considered the Adviser’s supervision of Trillium Asset Management, LLC (“Trillium”), the subadviser of the Balanced Fund, which performs theday-to-day portfolio management for the Fund.

With respect to the Equity Fund and the International Fund, these services include monitoring the Equity Fund’s performance and tracking error relative to the MSCI KLD 400 Social ex Fossil Fuels Index (the “MSCI KLD Index”); monitoring the International Fund’s performance and tracking error relative to the MSCI World ex USA SRI ex Fossil Fuels Index (the “MSCI World Index”); implementing the environmental and other policies of the Trust by voting the Equity Fund’s and the International Fund’s shareholder proxies; and overall compliance oversight provided by the Adviser. The Trustees also considered the Adviser’s supervision of Northern Trust Investments, Inc. (“Northern Trust”), the subadviser of the Equity Fund and the International Fund, which performsday-to-day portfolio management for those two Funds.

In addition, the Trustees considered the Adviser’s ongoing efforts and commitment with respect to shareholder advocacy and corporate environmental responsibility. They took into account thenot-for-profit ownership of the Adviser’s business, including its grant to a nonprofit organization out of its own resources and the fact that any distribution of profits by the Adviser are paid to its 100% owner, Paradigm Partners, which is comprised entirely of nonprofit advocacy organizations so that no individuals directly benefit from the distributed earned profits of the

Adviser. They also considered the administrative services provided by Green Century to the Funds under a separate agreement, including the coordination of the activities of the Funds’ other service providers. Based on its review of all of the services provided, the Trustees concluded that the nature, quality, and extent of services provided by the Adviser supported the continuance of the Advisory Agreements with respect to each Fund.

Investment Performance. With respect to the Balanced Fund, the Trustees reviewed and considered information regarding the investment performance of the Balanced Fund and comparative data with respect to the performance of other funds designated by Morningstar to have similar investment objectives as well as the Balanced Fund’s performance measured against the Lipper Balanced Fund Index (“Lipper Index”), which is a broad-based balanced fund market index, and against a custom balanced index (“Custom Index”) comprised of a 60% weighting in the S&P 1500 Index and a 40% weighting in the BofA Merrill Lynch1-10 Year US Corporate and Government Index. The Trustees also considered the performance information they had been provided throughout the year. After weighing all the factors deemed appropriate, including the environmental screens applied to the Fund’s investment process, the Trustees, including the Independent Trustees, concluded that the performance of the Balanced Fund supported the continuance of the Advisory Agreement with respect to the Balanced Fund.

The Costs of Services Provided and Profitability. The Trustees considered the costs of the services provided to the Funds and the profitability to the Adviser from its arrangements with the Funds.

The Trustees reviewed and considered an analysis of the advisory fees and total expenses ratios of each Fund and comparative data for multiple categories of mutual funds included in and as defined by Morningstar’s mutual fund database of thousands of mutual funds. For the Balanced Fund, the Trustees considered the Proposed Advisory Agreement Amendment and noted that, based on the information provided, the Fund’s advisory fee was lower than the average advisory fee for socially conscious funds (by 5 basis points), and higher than the average advisory fee for socially conscious balanced Funds (by 14 basis points), all balanced funds (by 11 basis points), and balanced funds with assets between $200 million and $300 million (by 1 basis point). The Trustees also noted that the total expense ratio of the Balanced Fund was capped at 1.48% and that the total expense ratio was higher than that of the average of socially conscious funds (by 36 basis points), socially conscious balanced funds (by 52 basis points), all balanced funds (by 54 basis points), and balanced funds with assets between $200 million and $300 million (by 57 basis points).

For the Equity Fund, the Trustees noted that, based on the information provided, the Fund’s advisory fee was lower than that of the average advisory fee for socially conscious funds (by 41 basis points), socially conscious growth and income funds (by 27 basis points), growth and income funds (by 37 basis points) and growth and income index funds (by 37 basis points). The Trustees also noted that the total expense ratio of Individual Investor Class of the Equity Fund was capped at 1.25%, and that the total expense ratio was higher than that of the average of socially conscious funds (by 13 basis points), socially conscious growth and income funds (by 13 basis points), all growth and income funds (by 9 basis points), and growth and income index funds (by 9 basis points).

For the International Fund, the Trustees noted that, based on the information provided, the Fund’s advisory fee for the Investor Class was lower than that of the average advisory fee for socially conscious funds (by 37 basis points) and socially conscious foreign large blend funds (by 42 basis points), and higher than the average advisory fee for foreign large blend index funds (by 10 basis points). The Trustees also noted that the total expense ratio of Individual Investor

Class shares of the International Fund was capped at 1.28% and that the total expense ratio was higher than that of the average of socially conscious funds (by 16 basis points) and foreign large blend index funds (by 78 basis points), and lower than the average of socially conscious foreign large blend funds (by 9 basis points).

Green Century provided the Trustees with information relating to the profitability to Green Century of its advisory relationships to the Funds. The Trustees noted that based on information provided by Green Century, the relationships to the Funds had not been profitable for several years, though recent growth in Fund assets resulted in a profit for the Adviser’s fiscal year ended June 30, 2015 and increasing levels of profit for subsequent periods through the Adviser’s fiscal year ended June 30, 2018. The Trustees considered an analysis of the estimatedFund-by-Fund profitability for Green Century from the investment management and administrative service it provides to the Trust, which showed that the Adviser had made a profit from managing the Balanced Fund and the Equity Fund, while its management of the International Fund remained unprofitable. In this regard, the Trustees considered the subadvisory fees and the other expenses incurred by the Adviser in providing advisory services to the Funds and the amount retained by Green Century out of the advisory fees. The Trustees also considered the fees received by Green Century for providing administrative services to the Funds and the expenses incurred in providing those services. In considering the cost allocation methodology used by Green Century, the Trustees took into consideration that the Adviser does not provide advisory or administrative services to other mutual funds ornon-mutual fund clients. The Trustees considered the costs and entrepreneurial risks assumed by the Adviser in connection with launching, branding and maintaining publicly-offered mutual funds and that the Adviser had been unprofitable for ten of the last eighteen years. The Trustees took into account the operational enhancements that Green Century had indicated it would need to undertake in connection with the growth of Fund assets, the addition of new share classes, and the expansion into different types of assets. The Trustees also considered Green Century’snon-profit ownership structure, its cost structure and personnel needs, and its investment in shareholder advocacy that aligns with the Funds’ stated intention to promote greater corporate environmental accountability. After reviewing the information described above, the Trustees concluded that the fees specified in the Advisory Agreements, taking into account the costs of the services provided by the Adviser and the profitability to the Adviser of its relationships with the Funds, supported the continuance of the Advisory Agreements with respect to the Funds.

Other Benefits. With respect tofall-out benefits from the Adviser’s arrangements with the Funds, the Trustees considered that neither Green Century nor any affiliate of Green Century receives any brokerage fees, soft dollar benefits, liquidity rebates from electronic communications networks or payments for order flow from the trades executed for each Fund. The Trustees noted that Green Century does potentially benefit from its relationship with the Funds due to the Funds’ reputation as the first family ofno-load environmentally responsible mutual funds and, more recently, as a pioneer in responsible and diversified fossil fuel free mutual funds. The Trustees considered that the association with the Funds supports Green Century’s own stated mission of advocating for corporate environmental responsibility. Further, pursuant to the Advisory Agreements, Green Century has reserved for itself the rights to the names “Green Century Funds” and any similar names; thus, Green Century may benefit in the future from developing other funds or investment products with the Green Century brand. The Trustees concluded that thefall-out benefits to be realized by Green Century were appropriate, and supported the continuance of the Advisory Agreements with respect to the Balanced Fund, the Equity Fund and the International Fund.

Economies of Scale. The Trustees also considered whether economies of scale could be realized by the Adviser as the Funds grow in asset size and the extent to which such economies of scale were reflected in the level of fees charged. They noted the relatively small size of each Fund and the resultant difficulty of achieving meaningful economies of scale, though they took into account the effects of significant recent increases in assets relative to how small the Trust had been up until a few years prior. They considered that if the assets were to increase, the Funds could have the opportunity to experience economies of scale as fixed costs would become a smaller percentage of the Funds’ assets and some of the Funds’ service providers’ fees, as a percentage of the Funds’ assets, could decrease. The Trustees noted that

the advisory fee structure for the Equity Fund includes break-points that would cause the advisory fee to decrease as a percentage of net assets as the Fund increased in size, though under certain circumstances the structure of the Fund’s unitary administrative fee arrangements with the Adviser could partly or wholly offset the effects of any advisory fee reduction on the total expense ratio. The Trustees concluded that there was no current need to seek additional breakpoints, that economies of scale could be realized as the Funds grow, and that if assets increased significantly the Trustees would have opportunities to negotiate further breakpoints or other decreases in fees with the Adviser.

Based on a review of all factors deemed relevant the Trustees, including the Independent Trustees, concluded that the Proposed Amendments with respect to the Balanced Fund’s Advisory Agreement be approved and that the Advisory Agreements with respect to all of the Funds should be continued for an additionalone-year period.

INVESTMENT SUBADVISORY AGREEMENTS

The Trustees voted to approve the continuance of the subadvisory agreement between the Trust, on behalf of the Balanced Fund, Green Century, and Trillium (the “Balanced Fund Subadvisory Agreement”), the continuance of the subadvisory agreement between the Trust, on behalf of the Equity Fund, Green Century, and Northern Trust (the “Equity Fund Subadvisory Agreement”) and the continuance of the subadvisory agreement between the Trust, on behalf of the International Fund, Green Century, and Northern Trust (the “International Fund Subadvisory Agreement” and together with the Balanced Fund Subadvisory Agreement and the Equity Fund Subadvisory Agreement, the “Subadvisory Agreements”) at the November 13, 2018 meeting. In connection with their deliberations at the meetings, and in a separate executive session of the Independent Trustees, the Trustees considered, among other things, information provided by Trillium regarding the investment performance of the Balanced Fund, and information provided by Northern Trust regarding the investment performance of the Equity Fund (including the success with which the Equity Fund tracked the MSCI KLD Index) and the International Fund (including the success with which the International Fund tracked the MSCI World Index), the subadvisory fees paid to Trillium and Northern Trust, the profitability to Trillium of its subadvisory relationship to the Balanced Fund and financial information about Northern Trust. The Trustees were assisted by independent counsel in considering these materials and the continuance of the Subadvisory Agreements. The Trustees considered all of the information provided to them by Trillium and Northern Trust, including information provided throughout the year. The Trustees also received a memorandum from independent legal counsel advising them of their duties and responsibilities in connection with the review of the Subadvisory Agreements. They took into account a proposal by Green Century and Trillium to amend the Subadvisory Agreement for the Balanced Fund to reduce the subadvisory fee by 0.05% or 5 basis points per annum on the average daily net assets of the Fund in excess of $250 million (the “Proposed Trillium Amendment”). In approving the continuance of the Subadvisory Agreements, including the Proposed Trillium Amendment, the Board, including the Independent Trustees, did not identify any single factor as determinative. Matters considered in connection with their approval of the Subadvisory Agreements included the following.

Nature, Quality, and Extent of Services Performed. The Trustees noted that under the terms of the Balanced Fund Subadvisory Agreement, Trillium provided theday-to-day portfolio management of the Balanced Fund, including determining asset and sector allocation; conducting securities selection and discovery; researching and analyzing environmental policies and practices of companies and implementing the Balanced Fund’s environmental screening criteria; managing the volatility, liquidity, risk, and turnover of the portfolio; and investing the portfolio consistent with the Balanced Fund’s investment objective and policies. The Trustees considered the professional expertise, tenure, and qualifications of the portfolio management team and noted that Trillium was devoted exclusively to environmentally and socially responsible investing and managed over $2 billion in assets. The Trustees also considered Trillium’s compliance record as well as the professional experience and responsiveness of Trillium’s compliance staff, as reported to them by the Trust’s chief compliance officer. The Trustees also considered Trillium’s leadership in social and environmental responsibility, including its shareholder advocacy efforts.

The Trustees noted that under the terms of the Equity Fund Subadvisory Agreement and the International Fund Subadvisory Agreement, Northern Trust provided theday-to-day portfolio management of each of the Equity Fund and the International Fund, making purchases and sales of portfolio securities consistent with each such Fund’s investment objective and policies and with changes to the applicable index. The Trustees considered the professional expertise, tenure, and qualifications of the portfolio management team as well as the team’s experience in passive management. The Trustees also considered Northern Trust’s handling of daily inflows and outflows, transaction costs, tracking error, and the portfolio turnover rates for each of the Equity Fund and the International Fund. The Trustees also considered Northern Trust’s compliance record as well as the professional experience and responsiveness of Northern Trust’s compliance staff, as reported to them by the Trust’s chief compliance officer.

Based on its review of all of the services provided and to be provided, the Trustees concluded that the nature, quality, and extent of services provided by Trillium and Northern Trust, respectively, supported the continuance of the Subadvisory Agreements.

Investment Performance. The Trustees reviewed and considered information regarding the investment performance of the Balanced Fund, exclusive of the expenses of the Fund, and comparative data with respect to the performance of mutual funds with similar investment objectives as well as other broad-based market indexes. The Trustees noted that as of periods ended July 31, 2018, the Balanced Fund’sten-year average annual returns outperformed the Lipper Index and itsone-, three- and five-year average annual returns underperformed the Lipper Index. The Trustees also noted that as of periods ended July 31, 2018, the Balanced Fund’sone-, three-, five- andten-year average annual returns underperformed the Custom Index.After considering all the factors deemed appropriate, the Trustees concluded that the performance of the Balanced Fund together with Trillium’s investment process, philosophies and experience in environmentally and socially responsible investing, supported the continuance of the Balanced Fund Subadvisory Agreement.

With respect to the Equity Fund and the International Fund, the Trustees considered that due to each Fund’s passive investment strategy, the principal concern with regard to investment performance was the extent to which the Fund tracked its respective index. The Trustees reviewed the performance of the Equity Fund, exclusive of the expenses of the Fund, as compared to that of the MSCI KLD Index for the twelve month period ended July 31, 2018, and noted that the Equity Fund’s performance closely followed that of the MSCI KLD Index. In particular, they observed that, after taking into consideration the Equity Fund’s fees and expenses, for theone-year period the Equity Fund’s performance was in line with that of the MSCI KLD Index. After considering all the factors deemed appropriate, the Trustees concluded that the performance of the Equity Fund together with Northern Trust’s investment process and experience in passive portfolio management supported the continuance of the Equity Fund Subadvisory Agreement. The Trustees reviewed the performance of the Investor Class shares of the International Fund, exclusive of the expenses of the class, as compared to that of the MSCI World Index for the twelve month period ended July 31, 2018, and noted that the Fund’s performance closely followed that of the MSCI World Index. In particular, they observed that, after taking into consideration the fees and expenses of the Investor Class shares, for the twelve month period ended July 31, 2018, the Fund’s performance was in line with that of the MSCI World Index. After considering all the factors they deemed appropriate, the Trustees concluded that the performance of the International Fund together with Northern Trust’s investment process and experience in passive portfolio management supported the continuance of the International Fund Subadvisory Agreement.

Costs of Services Provided and Profitability. The Trustees considered that the subadvisory fees paid by Green Century to Trillium under the Balanced Fund Subadvisory Agreement were 0.40% of the value of the average daily net assets of the Balanced Fund up to $30 million, and 0.35% of the value of the average daily net assets of the Balanced Fund in excess of $30 million, and, after the Proposed Trillium Amendment, would be 0.30% of the value of the average daily net assets of the Balanced Fund in excess of $250 million.

In evaluating the profitability of the Subadvisory Agreement to Trillium, the Trustees noted that based on information provided by Trillium, the relationship was profitable. The Trustees noted that Trillium stated that recent increases in the assets of the Balanced Fund have allowed Trillium to realize what it considers to be a fair entrepreneurial profit on the subadvisory services it provides. The Trustees considered the financial resources Trillium dedicated and the other expenses Trillium incurred in providing subadvisory services to the Balanced Fund, including startup costs relating to the relationship, and additional personnel, legal, trading analysis and compliance costs required in the context of providing subadvisory services to a mutual fund. The Trustees took under consideration that Trillium is the investment adviser to two other mutual funds and that Trillium recently began subadvising two additional mutual funds. The Trustees also considered Trillium’s fee structure and noted, based on the information provided, that the subadvisory fees were lower than the fees Trillium would receive from an institutional client with separate accounts of similar size as the Balanced Fund.

The Trustees considered that the subadvisory fees paid by Green Century to Northern Trust under the Equity Fund Subadvisory Agreement were an annual fee equal to the greater of (a) $75,000 or (b) 0.10% of the value of the average daily net assets of the Equity Fund up to but not including $50 million, 0.05% of the value of the average daily net assets of the Equity Fund from and including $50 million up to but not including $100 million, and 0.03% of the value of the average daily net assets of the Equity Fund equal to or in excess of $100 million.

The Trustees considered that the subadvisory fees paid by Green Century to Northern Trust under the International Fund Subadvisory Agreement were an annual fee equal to the greater of (a) $100,000 or (b) 0.17% of the value of the average daily net assets of the Fund up to but not including $50 million, 0.12% of the average daily net assets of the Fund from and including $50 million up to but not including $100 million, and 0.08% of the average daily net assets of the Fund equal to or in excess of $100 million.

The Trustees reviewed and considered an analysis of the subadvisory fees for the Equity Fund and the International Fund against comparative data for mutual funds subadvised by Northern Trust with a similar investment strategy and asset size. The Trustees noted that each Fund paid subadvisory fees at effective rates comparable to those paid to Northern Trust by other subadvised index funds with similar levels of net assets. In evaluating the profitability of each of the Equity Fund Subadvisory Agreement and International Fund Subadvisory Agreement to Northern Trust, the Trustees noted that Northern Trust does not calculate earnings at the subadvisory client level.

The Trustees also considered that the subadvisory fees are paid by Green Century, and are not in addition to the advisory fees paid to Green Century by the Funds.

After reviewing the information described above, the Trustees concluded that the fees specified in the Subadvisory Agreements, taking into account the nature and quality of services provided and the costs of the services provided by Trillium and Northern Trust as applicable, supported the continuance of the Subadvisory Agreements.

Other Benefits. The Trustees evaluated potential other benefits that each of Trillium and Northern Trust may realize from its relationship with the applicable Fund(s). The Trustees considered the brokerage practices of Trillium, including the soft dollar commissions that were generated with respect to the Balanced Fund’s portfolio transactions. The Trustees considered that Trillium was not affiliated with a broker/dealer and therefore no benefit would be realized by Trillium through transactions with affiliated brokers. The Trustees also considered the brokerage practices of Northern Trust, including that Northern Trust does not trade for the Equity Fund or the International Fund through its affiliated broker. The Trustees also considered that no soft dollars have been paid in connection with Northern Trust’s management of the Equity Fund and the International Fund.

The Trustees further considered the reputational and other advantages that each of Trillium and Northern Trust may gain from its relationship with the applicable Fund(s), including that Northern Trust’s management of the Equity Fund and the International Fund will broaden its exposure to the socially responsible mutual fund market, which may assist in its marketing efforts. The Trustees concluded that the benefits received by each of Trillium and Northern Trust were reasonable in the context of its relationship with the applicable Fund(s) and supported the continuance of the Subadvisory Agreements.

Economies of Scale. The Trustees also considered whether economies of scale would be realized by each of Trillium and Northern Trust as the Funds grow in asset size and the extent to which such economies of scale might be reflected in the subadvisory fees. They noted the relatively small size of each Fund (compared with similar funds in the industry) and the resultant difficulty of achieving meaningful economies of scale, though they took into account the effects of significant recent increases in assets. They considered that if the assets were to increase, Trillium and Northern Trust could have the opportunity to experience economies of scale. They also noted that pursuant to the Balanced Fund Subadvisory Agreement, the subadvisory fees paid to Trillium by Green Century (out of the flat 0.65% advisory fee) include breakpoints at $30 million and $250 million, so that fees as a percentage of net assets decrease modestly (from 40 basis points towards 35 basis points at $30 million and from 35 basis points toward 30 basis points at $250 million) as assets in the Balanced Fund increase. They also noted that pursuant to the Equity Fund Subadvisory Agreement and the International Fund Subadvisory Agreement, the overall subadvisory fees paid to Northern Trust by Green Century (out of the advisory fee that Green Century receives from the applicable Fund, which, for the Equity Fund, is subject to breakpoints) include breakpoints at $50 million and $100 million (subject to a minimum annual fee of $75,000 for the Equity Fund and $100,000 for the International Fund), so that fees as a percentage of net assets decrease as assets in the Equity Fund and the International Fund increase. The Trustees concluded that economies of scale could be realized as the Funds grow, and that the fee schedules as specified were appropriate, and supported the continuance of the Subadvisory Agreements.

Based on a review of all factors deemed relevant, the Trustees, including the Independent Trustees, concluded that the Proposed Trillium Amendment with respect to the Balanced Fund should be approved and that all of the Subadvisory Agreements should be continued for an additionalone-year period.

INVESTMENT ADVISER AND ADMINISTRATOR

Green Century Capital Management, Inc.

114 State Street

Boston, MA 02109

1-800-93-GREEN

www.greencentury.com

info@greencentury.com

INVESTMENT SUBADVISER (Balanced Fund)

Trillium Asset Management, LLC

Two Financial Center

60 South Street, Suite 1100

Boston, MA 02111

INVESTMENT SUBADVISER (Equity Fund and International Fund)

Northern Trust Investments, Inc.

50 South LaSalle Street

Chicago, IL 60603

SUBADMINISTRATOR and DISTRIBUTOR

UMB Fund Services, Inc. (Subadministrator)

UMB Distribution Services, LLC (Distributor)

235 West Galena Street

Milwaukee, WI 53212

CUSTODIAN

UMB Bank, n.a.

928 Grand Blvd

Kansas City, MO 64106

TRANSFER AGENT

Atlantic Shareholder Services, LLC

Three Canal Plaza

Portland, ME 04101

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

KPMG LLP

Two Financial Center

60 South Street

Boston, MA 02111

Printed on recycled paper with soy-based ink.

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YOUR NOTES

Semi-Annual Report

Beginning in March 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the Green Century Funds’ shareholder reports like this one will no longer be sent by mail, unless you specifically request paper copies of the reports from Green Century or from your financial intermediary, such as a broker-dealer or bank. Instead, the reports will be made available on the Funds’ website, and you will be notified by mail each time a report is posted and provided with a website link to access the report.

If you already elected to receive shareholder reports electronically, you will not be affected by this change and you need not take any action. You may elect to receive shareholder reports and other communications from the Green Century Funds electronically by contacting your financial intermediary or, if you invest directly with the Funds, by contacting Shareholder Services at1-800-221-5519 or by visitinghttps://www.greencentury.com/access-my-account/.

You may elect to receive all future reports in paper free of charge. If you invest directly with the Funds, you can inform Green Century that you wish to continue receiving paper copies of your shareholder reports by contacting Green Century at 1-800-221-5519 or via email at info@greencentury.com. If you invest through a financial intermediary, you can contact your financial intermediary to request that you continue to receive paper copies of your shareholder reports. Your election to receive reports in paper will apply to all funds held in your account if you invest through your financial intermediary or all accounts held in the Green Century Funds.

LOGO

January 31, 2019

Balanced

Fund

Equity Fund

International Fund

Item 2. Code of Ethics

Not applicable to semi-annual reports.

Item 3. Audit Committee Financial Expert

Not applicable to semi-annual reports.

Item 4. Principal Accountant Fees and Services

Not applicable to semi-annual reports.

Item 5. Audit Committee of Listed Registrants

Not applicable.

Item 6. Schedule of Investments

Included as part of the report to shareholders filed under Item 1 of this FormN-CSR.

Item 7. Disclosure of Proxy Voting Policies and Procedures forClosed-End Management Investment Companies

Not applicable.

Item 8. Portfolio Managers ofClosed-End Management Investment Companies

Not applicable.

Item 9. Purchases of Equity Securities byClosed-End Management Investment Company and Affiliated Purchasers

Not applicable.

Item 10. Submission of Matters to a Vote of Security Holders

There were no material changes to the procedures by which shareholders may recommend nominees to the registrant’s Board of Trustees.

Item 11. Controls and Procedures

(a)

Based on an evaluation of the disclosure controls and procedures (as defined in Rule30a-3(c) under the Investment Company Act of 1940, as amended, the “Disclosure Controls”) as of a date within 90 days of the filing date (the “Filing Date”) of this FormN-CSR (the “Report”), the registrant’s principal executive officer and principal financial officer have concluded that the Disclosure Controls are effectively designed to ensure that information that is required to be disclosed by the registrant in the Report is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms, including ensuring that information required to be disclosed in the Report is accumulated and communicated to the registrant’s management, including the registrant’s principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosures.

(b)

There were no changes in the registrant’s internal controls over financial reporting (as defined in Rule30a-3(d) under the Investment Company Act of 1940) that occurred during the fiscal period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 12. Disclosure of securities lending activities forclosed-end management investment companies.

Not applicable.

Item 13. Exhibits

(a)(1)

Not applicable.

(2)

Certifications for each principal executive and principal financial officer as required by Rule30a-2(a) under the Investment Company Act of 1940, as amended, (17 CFR270.30a-2(a)) are filed herewith.

(3)

Not applicable.

(4)

There was no change in the registrant’s independent public accountant for the period covered by this report.

(b)	Certifications required by Rule30a-2(b) under the Investment Company Act of 1940, as amended, (17 CFR270.30a-2(b)) are filed herewith.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Green Century Funds

/s/ John R. Nolan

John R. Nolan

President and Principal Executive Officer

April 5, 2019

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

/s/ John R. Nolan

John R. Nolan

President and Principal Executive Officer

April 5, 2019

/s/ John R. Nolan

John R. Nolan

Treasurer and Principal Financial Officer

April 5, 2019

Green Century Balanced Fund (GCBLX) N-CSRSCertified semi-annual shareholder report (management investment company)