AGG vs WCPB

AGGAiShares Core U.S. Aggregate Bond ETF

WCPBBWeitz Core Plus Bond ETF

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.

WCPB Weitz has been an independent Omaha shop since 1983. In 2025 it put its fixed income playbook in an ETF: an actively run core bond portfolio that hunts income in the mortgage and asset-backed corners the Agg leaves thin.

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.

WCPB The fund's primary objectives are current income and capital preservation.

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.

• WCPB Built to roam where the Agg does not. The fund's own materials point to agency and non-agency mortgages, asset-backed paper and select corporate credit as the "plus" in core plus.weitzinvestments.com
• Income comes first in the mandate: current income and capital preservation are the stated objectives, and cash goes out monthly.
• Not a new idea in a new wrapper. Weitz runs the same research-driven fixed income process it has used in its mutual funds, and the ETF discloses its holdings daily.businesswire.comweitzinvestments.com
• What sits in the portfolio lines up closely with the income-and-preservation mandate on the label, which is not a given among active bond funds.

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.

• WCPB 0.45% a year sits above the 0.36% category median and far above 0.03% index trackers like BND and SPAB. You are paying for active judgment, not index replication.
• It opened in August 2025, so the record is short and trading is lighter than the category's giants, which can mean wider spreads on the way in and out.
• Stepping outside the Agg into structured credit means results can diverge from a plain aggregate index fund, in either direction.weitzinvestments.com

Full AGG profile⁠

Full WCPB profile⁠