Fund · iShares U.S. Oil & Gas Exploration & Production ETF · measured from SEC filings
IEO holdings
IEO reports 47 holdings and behaves like 13.9 equally weighted ones, computed from its SEC Form N-PORT filing for 2026-06-30. The fact sheet publishes the first number; this page computes the second, and traces it across 28 quarters of filings.
Measured concentration
as of 2026-06-30Read this figure with the following in mind
3.4% of net assets is securities-lending cash collateral, excluded from the figure; counted as filed the fund would read 13.7
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: 100% at a quoted market price (level 1), one issuer country.
What stands out
as of 2026-06-30IEO's largest investment is Conocophillips at 17.26% of net assets. Valero Energy Corp and Marathon Petroleum Corp follow; the three together are 37.98%. Ten companies are 71.25% of the fund; the other 37 share the rest. Among the 721 equity funds measured here, IEO behaves like 13.9 holdings against a median of 42.4 — 3.0 times more concentrated than the median. Across 28 quarterly filings IEO has held roughly steady since 2019-09-30 (15.1 then, 13.9 now). Between the 2026-03-31 and 2026-06-30 filings 1 positions were added and 2 dropped; 12.8% of the weight moved.
Each sentence is read from the fund's own SEC filing; the class median is computed across the comparable equity funds on this site. Nothing here is a view on the fund.
Every filing since 2019
28Between 2019-09-30 and 2026-06-30, IEO went from behaving like 15.1 equally weighted positions to 13.9 — 8% fewer, while its top ten went from 68.62% to 71.25% of net assets. Read across the funds on the concentration-over-time table.
| Period | Holdings | Effective | Top 10 | Largest |
|---|---|---|---|---|
| 2026-06-30 | 47 | 13.9 | 71.25% | 17.26% |
| 2026-03-31 | 48 | 13.2 | 70.64% | 19.46% |
| 2025-12-31 | 48 | 13.2 | 71.33% | 19.52% |
| 2025-09-30 | 48 | 13.2 | 71.46% | 19.21% |
| 2025-06-30 | 49 | 13.5 | 71.36% | 18.24% |
| 2025-03-31 | 49 | 12.7 | 71.26% | 20.1% |
| 2024-12-31 | 48 | 12.8 | 70.2% | 20.26% |
| 2024-09-30 | 49 | 13.7 | 69.41% | 18.78% |
Earlier filings (20 more, back to 2019-09-30)
| Period | Holdings | Effective | Top 10 | Largest |
|---|---|---|---|---|
| 2024-06-30 | 48 | 13.3 | 70.17% | 19.12% |
| 2024-03-31 | 49 | 13.8 | 70.72% | 18.38% |
| 2023-12-31 | 48 | 13.5 | 70.33% | 19.3% |
| 2023-09-30 | 47 | 13.6 | 69.85% | 19.19% |
| 2023-06-30 | 51 | 15.1 | 67.24% | 17.7% |
| 2023-03-31 | 49 | 15.2 | 68.66% | 16.68% |
| 2022-12-31 | 49 | 14.3 | 67.9% | 18.66% |
| 2022-09-30 | 51 | 14.9 | 67.4% | 18.09% |
| 2022-06-30 | 51 | 15.2 | 67.57% | 17.28% |
| 2022-03-31 | 53 | 15 | 67.12% | 17.67% |
| 2021-12-31 | 52 | 14.7 | 68.63% | 17.72% |
| 2021-09-30 | 51 | 14.6 | 68.33% | 18.12% |
| 2021-06-30 | 48 | 15.4 | 67.64% | 16.64% |
| 2021-03-31 | 45 | 14 | 70.91% | 17.71% |
| 2020-12-31 | 42 | 15.2 | 69.51% | 14.53% |
| 2020-09-30 | 41 | 14.6 | 70.49% | 15.95% |
| 2020-06-30 | 41 | 13.8 | 71.72% | 16.4% |
| 2020-03-31 | 55 | 13 | 72.86% | 17.49% |
| 2019-12-31 | 57 | 15.2 | 68.31% | 15.27% |
| 2019-09-30 | 59 | 15.1 | 68.62% | 14.7% |
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
3.39% collateralIEO's filing lists 48 positions including 3.39% of net assets in securities-lending cash collateral. Counted as filed the fund reads 13.7 effective holdings with a top ten of 71.26%; on its own investments — the figure above — it reads 13.9 with a top ten of 71.25%. 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 2026-06-30The 15 largest of 47 positions in IEO's Form N-PORT, weight as a share of net assets, securities-lending collateral excluded. Every position, every quarter: IEO.csv.gz.
| # | Position | Weight | Cumulative |
|---|---|---|---|
| 1 | CONOCOPHILLIPS | 17.26% | 17.3% |
| 2 | VALERO ENERGY CORPORATION | 10.54% | 27.8% |
| 3 | MARATHON PETROLEUM CORPORATION | 10.17% | 38.0% |
| 4 | EOG RESOURCES, INC. | 6.56% | 44.5% |
| 5 | EQT CORPORATION | 4.84% | 49.4% |
| 6 | TEXAS PACIFIC LAND CORPORATION | 4.77% | 54.2% |
| 7 | PHILLIPS 66 | 4.46% | 58.6% |
| 8 | DIAMONDBACK ENERGY, INC. | 4.29% | 62.9% |
| 9 | DEVON ENERGY CORPORATION | 4.25% | 67.2% |
| 10 | EXPAND ENERGY CORPORATION | 4.10% | 71.3% |
| 11 | OVINTIV INC. | 2.73% | 74.0% |
| 12 | PERMIAN RESOURCES CORPORATION | 2.73% | 76.7% |
| 13 | APA CORPORATION | 2.17% | 78.9% |
| 14 | HF SINCLAIR CORPORATION | 2.01% | 80.9% |
| 15 | ANTERO RESOURCES CORPORATION | 1.95% | 82.8% |
Returns the fund reported
2019-07 – 2026-06Monthly total returns from Item B.5 of IEO's own filings, 84 months on record. Not computed here and not from a price feed.
Cross-checked against a series computed separately from prices: median difference — percentage points over 0 months, which is roughly the distributions. Every month with the filing it came from: IEO.json · all funds.
Who borrows IEO's shares
2026-06-30The fund lends its holdings, and Item B.4.a of the filing names every firm holding them. At 2026-06-30, $18m was out to 4 borrowers, 3.46% of net assets. The largest, JP MORGAN SECURITIES LLC, held 71.6% of it.
| Borrower | On loan | Share of the loan |
|---|---|---|
| JP MORGAN SECURITIES LLC | $13m | 71.6% |
| BofA Securities, Inc. | $4m | 22.5% |
| BNP PARIBAS PRIME BROKERAGE INTERNATIONAL LIMITED | $1m | 5.9% |
| CITIGROUP GLOBAL MARKETS INC. | $129 | 0.0% |
Cash collateral reported against the loan: 3.39% of net assets, 98.1% 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 IEO has filed, with each borrower: IEO.json · all funds.
Since the previous filing
2026-03-31 → 2026-06-3048 positions became 47: 1 added (0.1% of the fund at the later date), 2 dropped (3.8% at the earlier date). Half the sum of all weight changes, a turnover proxy: 12.8%. Positions are matched on identifiers, so a security whose identifier changed shows as one drop and one add. Every filing of IEO compared this way, as a feed: changes.xml · all funds: filings received.
| Largest increases | 2026-03-31 | 2026-06-30 | Largest decreases | 2026-03-31 | 2026-06-30 |
|---|---|---|---|---|---|
| MARATHON PETROLEUM CORPORATION | 4.43% | 10.17% | EOG RESOURCES, INC. | 9.44% | 6.56% |
| VALERO ENERGY CORPORATION | 9.07% | 10.54% | PHILLIPS 66 | 7.29% | 4.46% |
| TEXAS PACIFIC LAND CORPORATION | 3.72% | 4.77% | CONOCOPHILLIPS | 19.46% | 17.26% |
| EQT CORPORATION | 4.10% | 4.84% | DIAMONDBACK ENERGY, INC. | 4.80% | 4.29% |
| HF SINCLAIR CORPORATION | 1.40% | 2.01% | DEVON ENERGY CORPORATION | 4.47% | 4.25% |
| PERMIAN RESOURCES CORPORATION | 2.26% | 2.73% | SABLE OFFSHORE CORP. | 0.29% | 0.08% |
New: DIVERSIFIED ENERGY COMPANY (0.15%). Gone: COTERRA ENERGY INC. (3.82%), XAE ENERGY JUN26 (0.00%).
Asset categories and pricing
as of 2026-06-3096.63% equity, 3.37% short-term investment as filed; 100.0% 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.
Derivative exposure and counterparties
as of 2026-06-30A position count cannot describe a fund that uses derivatives, because a swap is filed at its unrealised gain, not its exposure. These are the notionals the fund itself reported, against net assets of $516M. Notional of an interest-rate or currency swap is not equity exposure.
Full detail for every fund that files derivatives: leverage.json (CC BY 4.0).
Neighbours by effective holdings, equity funds
10Every measured equity fund lined up by how many holdings it behaves like; these sit either side of IEO (13.9). Same filings, same arithmetic. Position in this list says nothing about which fund is better.
| Fund | Reports | Behaves like | Top ten | As of |
|---|---|---|---|---|
| URA Global X Uranium ETF | 66 | 13.1 | 63.33% | 2026-07-31 |
| LSGR Natixis Loomis Sayles Focused Growth ETF | 22 | 13.2 | 73.33% | 2026-06-30 |
| FTEC Fidelity MSCI Information Technology Index ETF | 282 | 13.4 | 62.26% | 2026-07-31 |
| TOPT iShares Top 20 U.S. Stocks ETF | 23 | 13.8 | 69.28% | 2026-06-30 |
| SMH VanEck Semiconductor ETF | 25 | 13.9 | 70.27% | 2026-06-30 |
| EWL iShares MSCI Switzerland ETF | 45 | 14.1 | 68.01% | 2026-05-31 |
| IAT iShares U.S. Regional Banks ETF | 33 | 14.1 | 69.48% | 2026-06-30 |
| EPOL iShares MSCI Poland ETF | 37 | 14.2 | 67.97% | 2026-05-31 |
| EWM iShares MSCI Malaysia ETF | 30 | 14.2 | 68.97% | 2026-05-31 |
| UPRO ProShares UltraPro S&P500 | 523 | 14.3 * | 51.33% | 2026-05-31 |
Essays that examine IEO
0Mentions 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.