ISTB vs STOT

ISTBAiShares Core 1-5 Year USD Bond ETF

STOTDState Street DoubleLine Short Duration Total Return Tactical 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.

STOT State Street's wrapper, DoubleLine's mandate: an actively run short-duration bond fund that aims to maximize current income while keeping average effective duration between one and three years, 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.

STOT The fund seeks to maximize current income while maintaining a dollar-weighted average effective duration of one to three years.

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.

• STOT Active, not an index clone. Managers work across bond sectors inside a stated one to three year average effective duration band rather than replicating a benchmark basket.
• Its reference point is the 1-3 year slice of the Agg, the low-rate-sensitivity end of the bond aisle, where price swings from rate moves are structurally smaller than long-maturity debt.
• Income is the stated job, and it lands monthly across roughly 600 positions, so no single issuer carries the paycheck.
• Among the steadier risk profiles in the broad bond cohort, which follows directly from the short maturity mandate.

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

• STOT 0.45% a year is above the typical broad bond fund and well above index anchors like BND and SPAB at 0.03%. Active security selection is what that premium buys.
• Active means drift. The 1-3 year Agg index is a yardstick here, not a target the fund is built to mirror, so holdings and results can diverge from it.
• Mid-sized and moderately traded rather than a liquidity giant, so spreads deserve a look before you place an order.

Full ISTB profile⁠

Full STOT profile⁠