Sustainable Bottom Line: Focused sustainable ultrashort bond funds are limited in number to eight funds but offer sustainable investors a range of sustainable investing strategies.
Notes of Explanation: In the case of mutual funds, returns are displayed for the largest share classes. Returns are to January 31, 2026. 3- and 5-year returns are average annual. Sources: Morningstar, Sustainable Research and Analysis LLC.
Observations:
• One of 19 focused sustainable fixed income investment categories, Ultrashort Bond funds, with $1.6 billion in assets across just eight mutual funds and ETFs (14 share classes) makes up the eighth largest investment category based on assets under management as of January 31, 2026. Just five firms currently offer focused sustainable Ultrashort Bond funds, including Calvert, PIMCO, Fidelity, Putnam and Krane, listed in size order. Krane’s KraneShares Sustainable Ultra Short Duration Index EFT is the only passively managed fund on offer.
• As is the case more generally for the taxable and municipal focused sustainable fixed income segment, when compared to the universe of conventional fixed income funds, Ultrashort Bond funds have room to grow. Currently, the investment category accounts for just 2.8% of focused sustainable fixed income fund assets versus a 6.3% share applicable to conventional Ultrashort Bond funds.
• Ultrashort Bond funds are investment vehicles that invest in high-quality, short-term debt securities with maturities typically under one year. Like money market funds, they are designed for capital preservation and income generation, but they offer higher yields than money market funds due to their exposure to higher but still modest interest rate and credit risk exposures.
• Focused sustainable Ultrashort Bond funds posted average annual returns over the trailing 12 months, 3- and 5-years of 4.5%, 5.1% and 3.4%, respectively, outpacing in each instance the Bloomberg 9-12 Month Short Treasury Index. While performance comparisons to conventional funds are problematic due to the significant disparities that exist in the number of listed funds, variety of fund offerings and strategies, their sizes and diversity of managers, their average and average weighted performance results nevertheless track each other closely. Maximum deviations based on average results run 40 bps while on a weighted average basis the deviations are narrower. That said, focused sustainable Ultrashort Bond funds achieved their results with lower levels of volatility, on average, relative to conventional funds while average expense ratios tend to be slightly higher.
• Sustainable investors have a limited number of investment options in this space but the eight funds offer a wider spectrum of sustainable investing strategies, ranging from the multi-strategy approach employed by the Calvert funds that encapsulate ESG integration, exclusionary screening, impact investing, thematic investing through an allocation to securities aligned with sustainability themes, as well as corporate engagement, to ESG screening and integration. Click on the following link for more details regarding the sustainable investing approaches employed by the segment of eight focused sustainable ultrashort bond funds. Ultrashort bond funds sustainable investing assessments
• Investors whose sustainable investing preferences align with an ESG integration approach pursuant to which relevant and financially material environmental, social and governance considerations are considered in investment decisions, should consider the option of investing in a non-focused sustainable ultrashort bond fund offered by investment management firms that integrate ESG across their investment franchises without explicitly reflecting this approach in prospectus language. Such options, for example, include ultrashort bond fund offerings by some of the largest investment management firms, including BlackRock, State Street and J.P. Morgan Asset Management that offer the iShares 0-3 Month Treasury Bond ETF, State Street SPDR Blmbg1-3MthT-Bill ETF and the JPMorgan Ultra-Short Income ETF, to mention just a few.
