Strategy. The Fund seeks to provide a combination of income and capital growth by investing in a portfolio of debt securities, using model-based asset allocation and security selection models. To determine the Funds investable universe, Fund management will first seek to screen out certain issuers based on ESG criteria determined by BlackRock, subject to the considerations noted below. Such screening criteria principally includes: (i) issuers that derive more than zero percent of revenue from the production of controversial weapons; (ii) issuers that derive more than zero percent of revenue from the production of civilian firearms; (iii) issuers that derive more than zero percent of revenue from the production of tobacco-related products; (iv) issuers that derive more than five percent of revenue … Show more… The Fund seeks to provide a combination of income and capital growth by investing in a portfolio of debt securities, using model-based asset allocation and security selection models. To determine the Funds investable universe, Fund management will first seek to screen out certain issuers based on ESG criteria determined by BlackRock, subject to the considerations noted below. Such screening criteria principally includes: (i) issuers that derive more than zero percent of revenue from the production of controversial weapons; (ii) issuers that derive more than zero percent of revenue from the production of civilian firearms; (iii) issuers that derive more than zero percent of revenue from the production of tobacco-related products; (iv) issuers that derive more than five percent of revenue from thermal coal generation, unless such issuers either (a) have made certain commitments to reduce climate impact or (b) derive at least fifty percent of revenue from alternative energy sources; (v) issuers that derive more than five percent of revenue from thermal coal mining; (vi) issuers that derive more than five percent of revenue from oil sands extraction; (vii) issuers identified violators of the United Nations Global Compact, which are globally accepted principles covering corporate behavior in the areas of human rights, labor, environment, and anti-corruption; and (viii) issuers receiving an ESG rating of B or below (or equivalent) by recognized third-party rating agencies. Notwithstanding the foregoing, the Fund may invest in green bonds of issuers that exceed the thresholds stated in (iv), (v) and (vi) above. The Fund relies on third-party ratings agencies to identify issuers for purposes of the above screening criteria. Third-party rating agencies may base the above screening criteria on an estimate when revenue for a covered business activity is not disclosed by the issuer or publicly available. The Funds screening criteria is measured at the time of investment and is dependent upon information and data that may be incomplete, inaccurate, unavailable or estimated. Where the Funds criteria looks solely to third-party ratings or data, issuers are only screened to the extent such ratings or data have been assigned or made available by the third parties. This screening criteria is subject to change over time at BlackRocks discretion. Fund management, relying on BlackRocks Systematic Fixed Income Research, then selects securities for the Fund by using a systematic method that relies on proprietary quantitative models to allocate the Funds assets among (i) various bond sectors by evaluating each sectors relative value and risk-adjusted return and (ii) bonds of different maturities based on yield characteristics and expectations. Specific investment selection decisions are made on the basis of evaluations of relative value, credit quality, transaction costs and other factors. In conjunction with this systematic method and to the extent applicable to a particular sector, Fund management selects and weights securities based on an issuers ability to manage the ESG risks to which its business is exposed, as determined by BlackRock. BlackRock researches and develops investment insights related to economic transition, which target carbon transition readiness and climate opportunities. The Fund seeks to maintain certain ESG characteristics, climate risk exposure and climate opportunities relative to the Bloomberg U.S. Aggregate Bond Index (the Benchmark). Specifically, the Fund generally seeks to invest in fixed income instruments that, with respect to certain sectors, in BlackRocks view, (i) have an ESG assessment that is better than the ESG assessment of such sectors within the Benchmark, (ii) have an aggregate carbon emissions assessment that is lower than that of such sectors within the Benchmark, and (iii) in the aggregate, includes issuers that BlackRock believes are better positioned to capture climate opportunities relative to the issuers in the Benchmark. Fund management makes such assessments based on BlackRocks ESG research, which includes due diligence of the ESG risks and opportunities facing an issuer, as well as third-party ESG ratings. Such sectors and issuers may not comprise the majority of the Funds portfolio. The Fund invests, under normal circumstances, at least 80% of its assets in bonds. For the purposes of this strategy, bonds include the following: obligations issued or guaranteed by the U.S. Government, its agencies or instrumentalities; mortgage-backed securities issued or guaranteed by the U.S. Government or its agencies or instrumentalities, including U.S. agency mortgage pass-through securities; commercial mortgage-backed securities; mortgage to-be-announced (TBA) securities; debt obligations of U.S. issuers, including corporate bonds and green bonds (which are bonds with proceeds that are used to fund eligible projects with specific environmental benefits); municipal securities; asset-backed securities; and U.S.-registered dollar-denominated debt obligations of foreign issuers. The Fund may invest in bonds issued by companies located in countries other than the United States, including companies in emerging markets. These securities may have all types of interest rate payment and reset terms, including fixed rate, adjustable rate, floating rate, zero coupon, contingent, deferred, payment in kind and auction rate features. The Fund seeks to invest a substantial portion of its assets in U.S.-registered, dollar-denominated bonds. The Fund may invest up to 10% of its assets in securities rated below investment grade (high yield or junk bonds). The Fund may invest in bonds of any maturity or duration. The Fund may invest a significant portion of its assets in U.S. agency mortgage pass-through securities, which are securities issued by entities such as the Government National Mortgage Association (GNMA) and the Federal National Mortgage Association that are backed by pools of mortgages. Most transactions in mortgage pass-through securities occur through standardized contracts for future delivery in which the exact mortgage-backed securities to be delivered are not specified until a few days prior to settlement. The Fund expects to enter into such contracts on a regular basis. When assessing the Funds investments in the mortgage sector against the Benchmark, the Fund currently considers GNMA securities to have a positive ESG assessment, and currently considers most other types of mortgage-backed securities to be neutral from an ESG perspective. The Fund may also seek to gain exposure to mortgage or government-backed securities that fund societal opportunity projects or environmental development, among other ESG related issues. The Fund may use derivatives, such as futures contracts, options, swaps and various other instruments. The Fund may also invest in derivatives based on foreign currencies. In addition, the Fund may use derivatives and short sales to enhance returns as part of an overall investment strategy or to offset a potential decline in the value of other holdings (commonly referred to as a hedge), although the Fund is not required to hedge and may choose not to do so. Show less