USIG vs VTC

USIGAiShares Broad USD Investment Grade Corporate Bond ETF

VTCAVanguard Total Corporate Bond ETF

In short

USIG Most investment-grade corporate bond funds hand you one slice of the maturity curve. USIG takes the whole thing, thousands of US dollar corporate bonds from short-dated to long, for four basis points a year.

VTC Most cheap corporate bond funds sell you one slice of the maturity curve. VTC buys the whole investment-grade corporate market, short to long, for 0.03% a year, and since 2025 it owns the bonds directly instead of stacking three Vanguard funds.

Stated mandate

USIG The fund seeks to track an index of U.S. dollar-denominated investment-grade corporate bonds.

VTC The Fund seeks to track a broad, market-weighted corporate bond index, specifically the Bloomberg U.S. Corporate Bond Index. It uses an indexing approach focused on investment-grade, fixed-rate, taxable corporate bonds.

Why people hold it

• USIG Costs 0.04% a year, against a category median near 0.19%. CORP, which tracks the same ICE BofA US Corporate Index, charges 0.41%.
• One ticker, the full USD investment-grade corporate curve: thousands of bonds, short to long. Slice funds like IGSB (1-5 year) and IGIB (5-10 year) each cover one segment.ishares.com
• Running since 2007, it has tracked its index with very little drift and is one of the more actively traded funds in its category.
• Interest lands monthly, and this is a multi-billion-dollar fund that ranks among the strongest implementations in its peer group.

• VTC 0.03% a year against a 0.19% median for investment-grade corporate ETFs. On this exact Bloomberg index, nothing in the group charges less.
• One ticker, the full corporate curve. Top-graded rivals like VCIT, IGIB and IGSB each buy a single maturity band; VTC's index spans short, intermediate and long fixed-rate corporates.
• No overlays, no active tilts, no credit guesswork. Market-weighted indexing of investment-grade, fixed-rate, taxable corporates, and the portfolio hews tightly to that mandate.
• Income lands monthly, not quarterly, which matters if bond coupons are doing real work in your cash flow.

Worth knowing

• USIG Owning the whole curve means long-dated bonds ride along, so the price swings more when rates move than a short-maturity slice such as IGSB.
• This is corporate credit, not Treasuries. Investment grade at purchase, but prices can fall when spreads widen or an issuer is downgraded.ishares.com
• VCIT edges it on fee at 0.03%, though that fund stays in intermediate maturities rather than the full curve.

• VTC Whole-curve means long bonds in the mix, so prices move more with interest rates than a 1-5 year slice like IGSB does.
• The plumbing changed in March 2025: Vanguard moved it from holding three underlying corporate bond ETFs to buying the index bonds directly. Same objective, same index.sec.gov
• Moderately traded rather than a volume heavyweight, so spreads can run wider than the busiest corporate bond funds, particularly in choppy markets.

Full USIG profile⁠

Full VTC profile⁠