ISTB vs NBSD

ISTBAiShares Core 1-5 Year USD Bond ETF

NBSDDNeuberger Berman Short Duration Income ETF

In short

ISTB The Agg with the long end trimmed off, plus a dash of high yield. ISTB tracks a broad USD bond index that stops at five-year maturities, so you get core bond plumbing with a fraction of the rate sensitivity, for six basis points.

NBSD A 1986 mutual fund that swapped into an ETF wrapper in 2024: same team, same mandate. It hunts the highest current income it can find in investment-grade bonds while holding duration to three years or less, and pays monthly.

Stated mandate

ISTB The fund seeks to track an index of U.S.-dollar bonds rated investment grade or high yield, with remaining maturities from one to five years.

NBSD The fund seeks the highest available current income while maintaining liquidity and limiting principal risk; total return is secondary. It invests at least 80% of net assets in investment-grade fixed- and floating-rate debt and normally targets average portfolio duration of three years or less.

Why people hold it

• ISTB Six basis points a year, a fraction of the typical broad bond ETF fee. On a bond fund, every basis point of fee comes straight out of the income you keep.ishares.com
• The index casts a wider credit net than the Agg: investment grade plus high yield, thousands of individual bonds deep.ishares.com
• Nothing in the index matures past five years, so the portfolio carries far less interest-rate sensitivity than full-maturity core bond funds like BND, SPAB or SCHZ.ishares.com
• Running since 2012, multi-billion-dollar, actively traded, and it pays income monthly rather than quarterly.

• NBSD Not a startup strategy. It ran as the Neuberger Berman Short Duration Bond Fund from 1986 and converted into this ETF in June 2024, carrying over the portfolio and the record.nb.comsec.gov
• The three-year duration target is written into the mandate, along with at least 80% investment grade, so rate moves push it around less than a core aggregate bond fund.
• Roughly 1,100 fixed and floating rate positions, US and overseas, keep any single issuer small. Income lands monthly.

Worth knowing

• ISTB The high yield sleeve adds credit risk that investment-grade-only short bond funds skip.ishares.com
• Short maturities cut both ways: smaller price swings when rates rise, and less lift when they fall.
• Not a cash substitute. The share price moves daily, and maturing bonds get replaced at whatever rates prevail, so the monthly payout drifts.ishares.com

• NBSD The 0.42% fee sits above the typical charge in its bond cohort. JPLD measures against the same 1-3 year government/credit index for 0.24%, and index agg funds like BND run 0.03%.
• Income comes first by design and total return is secondary. Short duration also means smaller price moves than long bonds when yields swing.
• Active picks across credit and floating rate debt can land either side of the plain 1-3 year benchmark, and the ETF's own trading history only starts in 2024.

Full ISTB profile⁠

Full NBSD profile⁠