Strategy. The Fund pursues its investment objective by investing, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in bonds. For purposes of this 80% policy, the term bonds refers to a variety of fixed-income securities and instruments of all types and maturities, including, but not limited to, mortgage-backed securities, asset-backed securities, corporate bonds, U.S. Treasury obligations, U.S. government and agency securities, commercial paper, loan interests, and funds that invest in short-term debt (such as money market funds). The Fund seeks to provide risk-adjusted returns that will outperform the Funds benchmark while achieving certain positive social and environmental impact objectives, as discussed below. In identifying investment opportunities for the Fund, the portfolio managers use … Show more… The Fund pursues its investment objective by investing, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in bonds. For purposes of this 80% policy, the term bonds refers to a variety of fixed-income securities and instruments of all types and maturities, including, but not limited to, mortgage-backed securities, asset-backed securities, corporate bonds, U.S. Treasury obligations, U.S. government and agency securities, commercial paper, loan interests, and funds that invest in short-term debt (such as money market funds). The Fund seeks to provide risk-adjusted returns that will outperform the Funds benchmark while achieving certain positive social and environmental impact objectives, as discussed below. In identifying investment opportunities for the Fund, the portfolio managers use a proprietary multi-factor sustainability framework, along with an analysis of fundamental business and credit quality factors, to guide both security selection and overall portfolio composition. The sustainability framework incorporates thematic investing, exclusions, positive tilting, sector- and issuer-level environmental, social and governance factor analysis and issuer engagement considerations as determined by the Adviser, as discussed further below. The Fund may, but is not required to, invest in so-called labeled bonds, which include debt where the proceeds have been specifically earmarked for ESG-themed purposes (Use of Proceeds bonds), or the returns are specifically tied to defined sustainable or environmental key performance indicators (KPI-linked bonds). The Fund will invest principally in investment grade bonds. An investment grade bond is a fixed-income or other debt security rated Baa3/BBB- or higher by a Nationally Recognized Statistical Ratings Organization (NRSRO) or, if unrated, determined to be of comparable credit quality by the Adviser. An NRSRO is a credit rating agency that is registered with the Securities and Exchange Commission (SEC) that issues credit ratings that the SEC permits other financial firms to use for certain regulatory purposes. The Fund may also invest up to 5% of its assets in securities rated below investment grade (sometimes referred to as junk bonds), or, if unrated, determined to be of comparable credit quality by the Adviser. The Fund may invest up to 20% of its net assets in foreign securities. The Fund will only invest in U.S. dollar denominated securities. Under normal circumstances, the Fund will seek to maintain an average portfolio duration (price sensitivity to changes in interest rates) of plus or minus 2 years as compared to the Bloomberg U.S. Aggregate Bond Index. As of October 31, 2022, the duration of the Bloomberg U.S. Aggregate Bond Index was 6.09 years. Please refer to the Glossary of Investment Terms for additional information about duration. In selecting bond investments, the portfolio managers employ a combination of bottom up fundamental security selection with a top down thematic approach, focusing on positive social and environmental themes. To identify the universe of investible securities for the Fund, the portfolio managers first apply broad-based negative screens, which incorporate third-party inputs, to seek to avoid (i) securities of issuers that are non-compliant with the UN Global Compact, and/or (ii) securities of issuers that, in the determination of the Adviser, are significantly engaged in or derive more than de minimis revenue from (or securitized products the economic value of which is tied in more than de minimis fashion to), industries, activities or assets considered by the Adviser or the portfolio managers to have a negative impact on society or the environment. A current list of such activities, which may evolve over time, follows: alcohol; animal testing (cosmetics); chemicals of concern; contentious industries (limited to excluding companies that produce palm oil); controversial armaments; controversial fossil fuel extraction and refining; controversial fossil fuel power generation; fur; gambling; genetic engineering; pornography; tobacco production; and United Nations Global Compact violators. Thereafter, the portfolio managers seek to identify bonds that are aligned with positive environmental and social impact themes, which are informed by the United Nations Sustainable Development Goals (UNSDGs). The impact themes followed by the Fund, which may evolve over time, include the following: Transition to a Green Economy, including the development of clean energy and sustainable transportation and cities; Affordable Housing, including increased access to home ownership and benefiting low to moderate income borrowers; Economic and Community Development and Inclusion, which includes financial services and infrastructure that are integral in the development of a sustainable economy; Knowledge & Technology, and Innovation, which includes technological advancements that can enable a transition to more sustainable business practices for companies across industries, such as software and semiconductors and industry specific innovation; and Health & Well-Being, which includes increased access to healthcare, and innovation for medical treatment and health. Under normal circumstances, the Fund will generally sell or dispose of portfolio investments when, in the opinion of the Adviser, they (i) no longer present attractive investment opportunity (e.g., they have reached their expected value, or where better relative value exists elsewhere, or as the result of changing market conditions); and/or (ii) no longer meet the Funds ESG and/or sustainable criteria. Decisions with respect to the timing of such dispositions shall be made by the Funds portfolio managers taking into account the best interests of Fund shareholders. The Fund may use derivatives, including, but not limited to, swaps (including interest-rate swaps, total rate of returns swaps and credit default swaps), swaptions, options, futures, and options on futures, which may be used for risk, duration and yield-curve management, or to enhance expected returns. Derivatives are instruments that have a value derived from, or directly linked to, an underlying asset, such as fixed-income securities, interest rates, currencies, or market indices. The Fund may invest in reverse-repurchase agreements and use the proceeds to invest in securities consistent with the Funds principal investment strategies. The Fund may enter into to be announced or TBA commitments when purchasing mortgage-backed securities or other securities. The Fund may also invest in floating rate obligations, such as collateralized loan obligations, floating rate senior secured syndicated bank loans, floating rate unsecured loans, and other floating rate bonds, loans and notes. The Fund may also invest in securities that have contractual restrictions that prohibit or limit their public resale (these are known as restricted securities), which may include Rule 144A securities. The Fund may also invest in cash or cash equivalents such as commercial paper, repurchase agreements and other short-duration fixed-income securities. The Fund may invest its uninvested cash in affiliated or non-affiliated money market funds (or private funds operating as money market funds). Due to the nature of the securities in which the Fund may invest, as well as certain investment techniques utilized by the portfolio managers, it may have relatively high portfolio turnover compared to other funds. The portfolio managers do not apply the ESG factors noted above in managing the Funds cash and exposure to U.S. Treasuries and certain derivatives, such as credit default swaps on indices or derivatives used to manage interest rate risk. The Fund may seek to earn additional income through lending its securities to certain qualified broker-dealers and institutions, on a short-term or long-term basis, in an amount equal to up to one-third of its total assets as determined at the time of the loan origination. Show less