September 2026 update

iShares US Aggregate Bond UCITS ETF · IE00BYXYYM63 · IUAA

Rebalix monthly basket snapshots compared: 6 August 2026 → 31 August 2026 (issuer-declared dates; each section states its own)

In brief: 3 issuers added and 1 removed from the basket · large-holding weights nearly unchanged · NAV change over the period +0.0% · costs and key facts unchanged.

Among countries, United States rises by 0.4 percentage points. 3 issuers entered the basket and 1 left.

Declared positions

10,146

10,124 → 10,146 · Δ +22

as of 31 Aug

NAV change over the period

+0.0%

in USD · 6 Aug → 31 Aug

Assets at month end

4.5 mld $

−1.6% in the month

Duration (effective)

5.71 yrs

first reading on record

as of 20 Aug

This page pictures the ETF’s basket, not the index. Because the fund uses optimised replication, portfolio changes reflect how the replication is implemented and do not necessarily coincide with the official index reviews.

Basket

Source: basket file published by the issuer, as of 20 Aug and 31 Aug, compared holding by holding by Rebalix (cash excluded, lines of the same holding merged).

Issuers added (3)

FHLMC 30YR UMBS SUPER0.02%

AVALONBAY COMMUNITIES INC MTN<0.01%

TEVA PHARMACEUTICAL FINANCE NETHER<0.01%

Issuers removed (1)

Andrew Mellon Foundation<0.01%

Rows compared: 1,575 → 1,577 issuers. The issuer file lists 10,146 positions but does not identify individual issues (no code per row): rows with the same name — e.g. the issues of one sovereign — are merged into one, so additions, removals and weight changes here are per issuer. Files of 20 Aug and 31 Aug.

Top 10 holdings

The largest holdings are issues of the same sovereign issuer: comparing them one by one says nothing. The useful reading is by country, below.

Sectors and countries

Source: aggregate breakdowns declared by the issuer in the two snapshots (6 Aug and 31 Aug).

Sectors — where the weight moved

MBS Pass-Through

22.9 → 23.0% · +0.14 p.p.

Treasury

48.2 → 48.3% · +0.13 p.p.

Industrial

5.2 → 5.3% · +0.07 p.p.

Financial Institutions

4.5 → 4.4% · −0.07 p.p.

Sovereign

1.0 → 1.0% · +0.02 p.p.

Supranational

1.1 → 1.1% · +0.02 p.p.

Bars scaled to the change: orange = up, grey = down. Basket percentages at the two snapshots.

Countries — where the weight moved

United States

75.8 → 76.2% · +0.39 p.p.

Ireland

4.8 → 4.5% · −0.36 p.p.

Switzerland

0.1 → 0.1% · +0.03 p.p.

Belgium

0.1 → 0.1% · +0.02 p.p.

Supranational

1.1 → 1.1% · +0.02 p.p.

The five countries that moved the most between the two snapshots.

See the numbers as a table

Country	6 Aug	31 Aug
United States	75.8%	76.2%
Ireland	4.8%	4.5%
Supranational	1.1%	1.1%
United Kingdom	0.7%	0.7%
Canada	0.5%	0.5%
Mexico	0.3%	0.4%
Japan	0.2%	0.2%
Germany	0.2%	0.2%
Belgium	0.1%	0.1%
Poland	0.1%	0.1%
Chile	0.1%	0.1%
Philippines	0.1%	0.1%
Switzerland	0.1%	0.1%
Peru	0.1%	0.1%
Panama	0.1%	0.1%
Israel	0.1%	0.1%
Uruguay	0.1%	0.1%
Spain	0.1%	0.1%
France	0.0%	0.1%
Australia	0.1%	0.1%
19 more countries below 0.05% in both snapshots

Maturities and ratings

Source: issuer factsheet with data as of 20 Aug; preserved in Rebalix’s monthly registry snapshot (2026-09).

Issuer-declared breakdowns, preserved in Rebalix’s monthly registry snapshots (as of 20 August 2026). Labels and order are the issuer document’s.

Maturities

0 - 1 Years

0.5%

1 - 2 Years

12.6%

2 - 3 Years

10.3%

3 - 5 Years

19.4%

5 - 7 Years

14.6%

7 - 10 Years

23.8%

10 - 15 Years

3.2%

15 - 20 Years

5.1%

20+ Years

9.8%

Cash and Derivatives

0.8%

this month (2026-09)the comparison with the prior month starts with the next snapshot

Rating — average AA- (media ponderata dal breakdown)

AAA

1.6%

74.6%

11.7%

BBB

11.3%

0.0%

Not

0.0%

Cash and/or Derivatives

0.8%

this month (2026-09)the comparison with the prior month starts with the next snapshot

NAV and assets over the period

Source: daily NAV series published by the issuer.

NAV over the period (USD)

6 Aug31 Aug

5.71 → 5.71: +0.0% from 6 Aug to 31 Aug, the last NAV available at each snapshot date.

Assets over the month

3 Aug31 Aug

4.5 mld $ → 4.5 mld $ (issuer’s daily series).

Costs and key facts

Source: issuer KID (costs as of 2 Sept); Rebalix events register.

TER

0.25%

unchanged

Transaction costs (KID)

0.01%

unchanged

Index, name, policy

unchanged

Issuer-declared basket snapshots, compared by Rebalix. Each section states its own dates: the basket comparison uses the issuer file dates; top 10, composition and breakdowns the dates of the two archived snapshots; maturities, ratings and duration the monthly registry snapshots. Weight changes are shown above ±0.25 points (the archive records them from ±0.1). We record the past: nothing on this page is a recommendation.