GOVT vs SPTB

GOVTAiShares U.S. Treasury Bond ETF

SPTBAState Street SPDR Portfolio Treasury ETF

In short

GOVT The plain-vanilla Treasury sleeve. One index fund spanning the full maturity spectrum of US government debt, running since 2012 at five basis points, with none of the credit risk that lives in the rest of the bond aisle.

SPTB State Street's Treasury slice of the Agg in one ticker: the whole curve from a year out to the long end, roughly 300 bonds, for three basis points. It arrived in 2024 as the Treasury building block in the SPDR Portfolio suite.

Stated mandate

GOVT The fund seeks to track an index of U.S. Treasury bonds spanning the full maturity spectrum, providing broad exposure to U.S. government debt for stability and income.

SPTB The fund seeks to track, before fees and expenses, the price and yield performance of the Bloomberg U.S. Treasury Index and provides exposure to U.S. Treasuries with at least one year remaining to maturity.

Why people hold it

• GOVT Charges 0.05% a year, well under the median fee in its broad-Treasury peer group.
• Tracks the ICE US Treasury Core Bond Index tightly, one of the cleaner index implementations among broad Treasury funds.
• A multi-billion-dollar fund that trades heavily, which tends to show up as thin bid-ask spreads for retail-size orders.
• US Treasury debt and nothing else, paid out monthly. No corporate credit to underwrite, no mortgage prepayments to model.ishares.com

• SPTB Three basis points. The typical fund in the Treasury cohort charges about five times that, and SPTB undercuts iShares' GOVT at five while tying Vanguard's VTG.
• One ticker covers the full Treasury curve, everything with at least a year to maturity, instead of stacking separate short, intermediate and long sleeves.ssga.com
• Plain index replication of the Bloomberg U.S. Treasury Index: government paper only, no credit sleeve, no derivatives overlay in the mandate.ssga.com
• Pays income monthly, and the implementation ranks in the top quartile of its Treasury peer group on our review.

Worth knowing

• GOVT Covering the full maturity spectrum means long-dated bonds are in the mix, so the share price moves with interest rates more than a short-dated Treasury fund's would.
• Nominal Treasuries only. Inflation-linked exposure sits in different funds, such as SPIP or VTP.
• SPTB runs the same broad-Treasury idea at 0.03%, two basis points less.

• SPTB Full-curve means long bonds are in the mix, so the price swings with interest rates far more than a short-term Treasury fund does.
• It launched in 2024, so the live record is short next to cohort veterans that have traded through multiple rate cycles.
• Moderately traded rather than the volume leader in its category, so bigger orders are worth routing with limits and a glance at the spread.

Full GOVT profile⁠

Full SPTB profile⁠