AGG vs AGGS

AGGAiShares Core U.S. Aggregate Bond ETF

AGGSCHarbor Disciplined Bond ETF (AGGS)

In short

AGG Launched in 2003, one of the first funds to pack the entire U.S. investment-grade bond market into a single ticker: Treasuries, corporates and mortgage bonds, three basis points a year, cash paid monthly.

AGGS Harbor hands the keys to Income Research + Management, a Boston bond boutique whose day job is institutional money, and lets it run an active core bond book at a price near the middle of an index-dominated pack.

Stated mandate

AGG The fund seeks to track the Bloomberg U.S. Aggregate Bond Index, providing broad exposure to the total U.S. investment-grade bond market.

AGGS The Fund seeks total return.

Why people hold it

• AGG 0.03% a year against a peer-group median near 0.36%. On a bond fund, the fee comes straight out of the coupon, so the gap matters more than it looks.
• A $100 billion-plus fund and very actively traded, the kind of depth that keeps bid-ask costs down for retail-sized orders.
• Tracks the Bloomberg U.S. Aggregate closely, with one of the tightest index-following records in its peer group. Income is distributed monthly.
• Running since 2003, giving it one of the longest track records among U.S. bond index ETFs.

• AGGS Subadvised since its 2024 launch by Income Research + Management, an independent fixed income firm that manages bond portfolios for institutional and private clients.sec.govharborcapital.com
• At 0.35%, it charges about what the typical aggregate-bond ETF does, which is unusual for a portfolio picked bond by bond rather than copied from an index.
• Pays monthly across roughly 200 positions, so income lands on a steady cadence instead of quarterly lumps.
• Stays in its lane: total return from a diversified book of mostly US dollar bonds, matching what the prospectus describes.

Worth knowing

• AGG Investment grade and U.S. dollar only. High-yield debt and foreign bonds sit outside the mandate, so this is designed as core ballast rather than a yield hunt.
• Rate risk comes as it comes. The index gets tracked whether yields rise or fall, with no manager stepping in to shorten duration.
• The same index is sold by SPAB, SCHZ and BBAG at the same 0.03%. The portfolio is the commodity here; scale and trading depth are the tiebreakers.

• AGGS Thinly traded on a small asset base, so bid-ask spreads can run wider than the giant index bond funds.
• Index rivals BND, SPAB and SCHZ charge 0.03%, so the active work here starts with a real fee gap to make up.
• Launched in 2024, so the track record is short and covers a narrow slice of rate history.

Full AGG profile⁠

Full AGGS profile⁠