Fund · iShares Broad USD Investment Grade Corporate Bond ETF · measured from SEC filings
USIG holdings
USIG reports 11,459 holdings and behaves like 6893.6 equally weighted ones, computed from its SEC Form N-PORT filing for 2026-05-31. The fact sheet publishes the first number; this page computes the second, and traces it across 27 quarters of filings.
Measured concentration
as of 2026-05-31Read this figure with the following in mind
9.4% of net assets is securities-lending cash collateral, excluded from the figure; counted as filed the fund would read 110.8
The figure below is what the filing says, published unchanged. What it may not do is sit beside a plain long-only fund and be read as the same quantity. How comparability is decided.
Computed by this site from the fund's SEC Form N-PORT filing; what the measure does not tell you · every fund in one table · hold it with other funds? X-ray the mix. Pricing: 8.73% at a quoted market price (level 1), 43 issuer countries.
What stands out
as of 2026-05-31USIG's largest investment is Anheuser-Busch Cos LLC / Anheuser-Busch InBev Worldwide Inc at 0.09% of net assets. Bank Of America Corp and Eagle Funding Luxco Sarl follow; the three together are 0.25%. Ten companies are 0.73% of the fund; the other 11,449 share the rest. Among the 192 bond funds measured here, USIG behaves like 6893.6 holdings against a median of 236.4 — 29.1 times the median. Across 27 quarterly filings USIG has become less concentrated: it behaved like 1999.4 at 2019-11-30 and 6893.6 at 2026-05-31. Between the 2026-02-28 and 2026-05-31 filings 550 positions were added and 386 dropped; 9.6% of the weight moved. the United States is the largest country at 80.29% of the portfolio, across 43 countries in the filing.
Each sentence is read from the fund's own SEC filing; the class median is computed across the comparable bond funds on this site. Nothing here is a view on the fund.
Every filing since 2019
27Between 2019-11-30 and 2026-05-31, USIG went from behaving like 1999.4 equally weighted positions to 6893.6 — 245% more, while its top ten went from 2.65% to 0.73% of net assets. Read across the funds on the concentration-over-time table.
| Period | Holdings | Effective | Top 10 | Largest |
|---|---|---|---|---|
| 2026-05-31 | 11,459 | 6893.6 | 0.73% | 0.09% |
| 2026-02-28 | 11,295 | 6845.4 | 0.73% | 0.08% |
| 2025-11-30 | 11,175 | 6121 | 1.11% | 0.45% |
| 2025-08-31 | 11,036 | 6021.4 | 1.11% | 0.49% |
| 2025-05-31 | 10,997 | 6886.1 | 0.68% | 0.09% |
| 2025-02-28 | 10,647 | 6617.9 | 0.73% | 0.1% |
| 2024-11-30 | 10,507 | 6073.7 | 1.03% | 0.37% |
| 2024-08-31 | 10,362 | 5925.5 | 1.05% | 0.4% |
Earlier filings (19 more, back to 2019-11-30)
| Period | Holdings | Effective | Top 10 | Largest |
|---|---|---|---|---|
| 2024-05-31 | 10,343 | 6399.8 | 0.81% | 0.13% |
| 2024-02-29 | 10,177 | 6268.5 | 0.83% | 0.14% |
| 2023-11-30 | 9,988 | 6184.9 | 0.78% | 0.11% |
| 2023-08-31 | 9,806 | 5005.3 | 1.33% | 0.61% |
| 2023-05-31 | 9,700 | 3696.2 | 1.74% | 1.04% |
| 2023-02-28 | 9,631 | 4400.7 | 1.51% | 0.8% |
| 2022-11-30 | 9,434 | 2802 | 2.12% | 1.4% |
| 2022-08-31 | 9,340 | 4492.5 | 1.49% | 0.74% |
| 2022-05-31 | 9,253 | 3566.4 | 1.83% | 1.07% |
| 2022-02-28 | 8,939 | 2369.9 | 2.36% | 1.57% |
| 2021-11-30 | 8,776 | 3615.3 | 1.83% | 0.98% |
| 2021-08-31 | 8,483 | 3549.2 | 1.86% | 0.96% |
| 2021-05-31 | 8,229 | 3517.9 | 1.84% | 0.93% |
| 2021-02-28 | 7,837 | 2986.7 | 2.02% | 1.07% |
| 2020-11-30 | 7,638 | 3807.6 | 1.73% | 0.57% |
| 2020-08-31 | 7,269 | 3454.4 | 1.72% | 0.76% |
| 2020-05-31 | 6,649 | 3329.5 | 1.69% | 0.7% |
| 2020-02-29 | 6,341 | 2804.4 | 2.13% | 1.02% |
| 2019-11-30 | 6,074 | 1999.4 | 2.65% | 1.56% |
One row per filed reporting period, newest first, read from EDGAR. Quarterly because that is the public filing cadence. Rows marked * are published but held out of the comparison above; the methodology page says when and why.
As filed, collateral included
9.42% collateralUSIG's filing lists 11,460 positions including 9.42% of net assets in securities-lending cash collateral. Counted as filed the fund reads 110.8 effective holdings with a top ten of 10.08%; on its own investments — the figure above — it reads 6893.6 with a top ten of 0.73%. The collateral is matched by a liability and is not a holding the fund chose; since 2026-09-18 every figure on this site sets it aside (methodology). Both numbers are in the data.
Largest positions, as filed
as of 2026-05-31The 15 largest of 11,459 positions in USIG's Form N-PORT, weight as a share of net assets, securities-lending collateral excluded. Every position, every quarter: listed with the point-in-time files, available on request.
| # | Position | Weight | Cumulative |
|---|---|---|---|
| 1 | ANHEUSER-BUSCH CO/INBEV | 0.09% | 0.1% |
| 2 | BANK OF AMERICA CORP | 0.09% | 0.2% |
| 3 | EAGLE FUNDING LUXCO SARL | 0.08% | 0.3% |
| 4 | CVS HEALTH CORP | 0.08% | 0.3% |
| 5 | T-MOBILE USA INC | 0.07% | 0.4% |
| 6 | GOLDMAN SACHS GROUP INC | 0.07% | 0.5% |
| 7 | META PLATFORMS INC | 0.06% | 0.5% |
| 8 | GOLDMAN SACHS GROUP INC | 0.06% | 0.6% |
| 9 | GOLDMAN SACHS GROUP INC | 0.06% | 0.7% |
| 10 | GOLDMAN SACHS GROUP INC | 0.06% | 0.7% |
| 11 | PFIZER INVESTMENT ENTER | 0.06% | 0.8% |
| 12 | AMAZON.COM INC | 0.06% | 0.8% |
| 13 | BOEING CO | 0.06% | 0.9% |
| 14 | CVS HEALTH CORP | 0.06% | 1.0% |
| 15 | ABBVIE INC | 0.06% | 1.0% |
By country of issuer
as of 2026-05-31Share of USIG's own investments by the issuer country the filer reported (incorporation, not revenue). Each country links to every fund that holds it.
| Country | Share |
|---|---|
| United States | 78.41% |
| United Kingdom | 3.81% |
| Canada | 3.05% |
| Japan | 2.21% |
| France | 1.66% |
| Netherlands° | 1.29% |
| Australia | 1.26% |
| Cayman Islands° | 0.90% |
Returns the fund reported
2019-09 – 2026-05Monthly total returns from Item B.5 of USIG's own filings, 81 months on record. Not computed here and not from a price feed.
Cross-checked against a series computed separately from prices: median difference 0.14 percentage points over 81 months, which is roughly the distributions. Every month with the filing it came from: USIG.json · all funds.
Who borrows USIG's shares
2026-05-31The fund lends its holdings, and Item B.4.a of the filing names every firm holding them. At 2026-05-31, $1.6bn was out to 27 borrowers, 9.13% of net assets. The largest, JP MORGAN SECURITIES LLC, held 22.3% of it.
| Borrower | On loan | Share of the loan |
|---|---|---|
| JP MORGAN SECURITIES LLC | $354m | 22.3% |
| BARCLAYS BANK PLC | $301m | 19.0% |
| GOLDMAN SACHS & CO. | $239m | 15.0% |
| BNP PARIBAS PRIME BROKERAGE INTERNATIONAL LIMITED | $107m | 6.8% |
| DEUTSCHE BANK SECURITIES INC | $94m | 6.0% |
Cash collateral reported against the loan: 9.42% of net assets, 103.2% of the amount lent. That is a floor on the collateral, not the whole of it — collateral the fund does not hold as a position is not in this filing, so a figure under 100% is not evidence of under-collateralisation. How that figure behaves across all funds. Every quarter USIG has filed, with each borrower: USIG.json · all funds.
Since the previous filing
2026-02-28 → 2026-05-3111,295 positions became 11,459: 550 added (4.7% of the fund at the later date), 386 dropped (3.0% at the earlier date). Half the sum of all weight changes, a turnover proxy: 9.6%. Positions are matched on identifiers, so a security whose identifier changed shows as one drop and one add. Every filing of USIG compared this way, as a feed: changes.xml · all funds: filings received.
| Largest increases | 2026-02-28 | 2026-05-31 | Largest decreases | 2026-02-28 | 2026-05-31 |
|---|---|---|---|---|---|
| BLACKROCK CASH FUNDS TREASURY SL AGENCY SHARES | 0.03% | 0.05% | UBS GROUP AG | 0.04% | 0.02% |
| AMERICAN EXPRESS CO | 0.01% | 0.03% | JPMORGAN CHASE & CO | 0.04% | 0.02% |
| FEDEX CORP | 0.00% | 0.02% | BANK OF AMERICA CORP | 0.05% | 0.03% |
| BANK OF MONTREAL | 0.02% | 0.03% | KRAFT HEINZ FOODS CO | 0.02% | 0.00% |
| CAPITAL ONE FINANCIAL CO | 0.00% | 0.01% | JPMORGAN CHASE & CO | 0.05% | 0.03% |
| MORGAN STANLEY | 0.03% | 0.04% | BECTON DICKINSON & CO | 0.02% | 0.00% |
New: AMAZON.COM INC (0.06%), AMAZON.COM INC (0.05%), SALESFORCE INC (0.04%), AMAZON.COM INC (0.04%), BANK OF AMERICA CORP (0.04%), BANK OF AMERICA CORP (0.04%). Gone: WELLS FARGO & COMPANY (0.05%), T-MOBILE USA INC (0.04%), JPMORGAN CHASE & CO (0.04%), WELLS FARGO & COMPANY (0.03%), GOLDMAN SACHS GROUP INC (0.03%), CENTENE CORP (0.03%).
Asset categories and pricing
as of 2026-05-3191.27% debt, 8.73% short-term investment as filed; 8.7% carried at a quoted market price (fair-value level 1). Categories and levels are the filer's; what a low level-1 share does and does not mean is in the measure's page.
Neighbours by effective holdings, debt funds
5Every measured debt fund lined up by how many holdings it behaves like; these sit either side of USIG (6893.6). Same filings, same arithmetic. Position in this list says nothing about which fund is better.
| Fund | Reports | Behaves like | Top ten | As of |
|---|---|---|---|---|
| LQD iShares iBoxx $ Investment Grade Corporate Bond ETF | 3,136 | 1889.9 | 2.41% | 2026-05-31 |
| IGLB iShares 10+ Year Investment Grade Corporate Bond ETF | 3,836 | 1905.3 | 2.64% | 2026-05-31 |
| SPIB State Street(R) SPDR(R) Portfolio Intermediate Term Corporate Bond ETF | 5,147 | 2196.7 | 2.69% | 2026-06-30 |
| QLTA iShares Aaa - A Rated Corporate Bond ETF | 3,502 | 2213.7 | 1.83% | 2026-07-31 |
| PZA Invesco National AMT-Free Municipal Bond ETF | 6,664 | 3341.2 | 1.1% | 2026-05-31 |
Essays that examine USIG
1-
Why 2,017 IWM Holdings Read as 33: Securities Lending in the Russell 2000 ETF
IWM, the iShares Russell 2000 ETF, files 2,017 holdings but our concentration measure read it as 33. The cause is a 17% cash-collateral position from securities lending, flagged in the filing itself; set it aside and the fund's own investments behave like about 840. Seventy-three funds on this site, including IJH, IJR, RSP, LQD and HYG, had the same problem. What we found, what we changed today, and what is still open.
Mentions are detected across the full text of every article, so an appearance may be a passing comparison rather than the subject. Nothing here is a recommendation to buy or sell — see the disclaimer.