BND vs AGG overlap: how much of them is the same

Measured over 19 years of daily prices: what each one brings, and what changes when both are held.

Measured on 2026-09-17

What is inside BND could not be read today, so how much these two hold in common is not measured here. What was measured: essentially all of the movement travels in one shared direction.

The largest companies, and which of the two holds them

Company	Share of a half-and-half mix	Through
BISXX	1.5%	AGG 1.5% — held through one of the two only

The vendor published no holdings for BND at the moment this page was built, and nothing was assumed in their place. The table above therefore shows one fund's companies, not an overlap. Every other figure on this page is measured from prices and is unaffected.

The worst falls on record

Holding	Worst fall	Volatility
BND	19%	5%
AGG	18%	5%
Both, half and half	18%	5%

Measured on the same window for all three rows, so they can be read against each other. A fall is peak to trough on daily closes.

Where the risk sits in a half-and-half mix

Holding	Money	Risk	Ratio
AGG	50%	51%	1.02
BND	50%	49%	0.98

The reading, in full

PORTFOLIO: BND + AGG
2007-04-10 to 2026-09-17 · 4,891 trading days · USD

2 holdings.
Essentially all of it is one shared direction, led by AGG, BND.

AGG carries 51% of the risk on its own.
Volatility 5% · worst fall on record 18%.
Risk 5% → 4% over the last year, mostly because the holdings themselves got quieter.

Descriptive. No forecast, no advice. Every figure above is measured over the window named at the top.
riskcopilot.app

What this does not say

Every figure is measured on past daily prices over the window below. It is not a forecast of returns or losses.
The window starts when the younger fund began trading, so older crises may lie outside it.
The overlap is measured through published holdings only, and is a floor: the real figure is at least this, and cannot be smaller.
Which of two funds to hold depends on things not measured here — what you already own, costs at your broker, and your own tax position.

Measure it with what you actually hold

Change the split, add the rest of your portfolio, see what the pair does inside it: same engine, nothing saved on our side.

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Other pairs

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Measured 2007-04-10 to 2026-09-17 over 4,891 trading days, in USD, from yahoo prices. Descriptive: this page reports what these two funds have done and how much of them is the same holding. It does not forecast returns or losses, it does not say which to hold, and it is not advice. How every figure is measured. Terms and privacy: /terms. If a figure looks wrong: [email protected].