GRNB is a unique take in the fixed income space: an ESG-focused fund with a global scope and passive management. The fund invests in bonds issued to finance green projectsprimarily solar, wind, and low-carbon construction. Issuers must seek and receive certification from the Climate Bonds Initiative, a London-based NGO. GRNB may hold both corporate and government issues, with only a few restrictions: tax-exempt municipals are excluded, while sub-investment-grade issues are capped at 20% of the portfolio. Issuers may be located in any geography, but holdings must be USD denominated. Rebalancing is done monthly. GRNB launched in March 2017 and as of September 3, 2019, the fund tracks the S&P Green Bond U.S. Dollar Select Index.