It is an ultra-short-term bond ETF that holds US Treasury floating rate notes and tracks the Bloomberg U.S. Treasury Floating Rate Bond Index. The coupons on its holdings reset periodically to short-term interest rates, so its duration is very short.

It suits conservative investors who want to earn interest at short-term rate levels while minimizing price losses when rates rise, as well as those who manage cash-parking funds.

It is a passive (index-tracking) ETF managed by WisdomTree.

The fund holds only floating rate Treasury notes issued by the US Treasury, using a representative sampling approach, and follows the movements of short-term interest rates. Because the coupons on its holdings are linked to short-term Treasury yields and reset periodically, its price tends to fluctuate little even when rates rise, unlike fixed-rate bonds.

• High credit quality, holding only US Treasuries
• Floating rate structure with coupons linked to interest rates

Assets under management (AUM) stand at $21.3B, and the expense ratio is 0.15% per year.

Compared with short-term Treasury ETFs in the same category, its floating rate structure makes a difference in how it responds to rising-rate environments.

Its distributions depend on the level of short-term interest rates, while price movements themselves tend to be limited given the nature of ultra-short-term bonds. When rates remain high, the appeal of its distributions tends to stand out.

In periods when demand for cash-like assets grows, money tends to flow into the short-term Treasury and ultra-short bond categories, and USFR, as a large ETF with a broad asset base, continues to draw steady interest.

Its strengths are the high credit quality of its Treasury base and protection against rising rates, while its drawback is that distributions shrink when rates fall.

The four funds shown in the table, SGOV, BIL, VBIL and BILS, invest in short-term Treasuries or Treasury bills on a fixed-rate basis. They belong to the same ultra-short, cash-like category, but their coupon structure is different. As a close direct alternative that tracks floating rate Treasuries, there is TFLO, also shown in the table. For those who want slightly longer-maturity short-term Treasury exposure, SHV is an option, and products such as ICSH, which also includes ultra-short corporate bonds, can be considered as well.

Here are the points to review before investing in USFR. It is relatively stable as a cash-like asset, but distributions vary with the direction of interest rates, and exchange rates and accumulated costs affect returns over long holding periods, so they should be checked in advance.

The key risk is that when rates fall, coupons shrink and distribution income declines. In addition, during periods of rising prices, nominal interest may not fully protect real purchasing power.

It is highly useful as a cash-like asset for those who want to earn interest at short-term rate levels while reducing exposure to rising-rate risk. If you prefer fixed-rate exposure, short-term Treasury ETFs such as SGOV and BIL are comparison candidates, and if you want a floating rate structure, products such as TFLO are the ones to compare.