Key Highlights

  • The fund tracks U.S. companies involved in oil and gas exploration and production.
  • ConocoPhillips, Marathon Petroleum and Valero make up roughly 42% of the portfolio.
  • The expense ratio is 0.37%, and net Assets were about US$817.7 million.
  • The fund is listed on Cboe BZX and pays distributions quarterly.

The iShares U.S. Oil & Gas Exploration & Production ETF (CBOE:IEO) seeks to track U.S. companies engaged in exploration, production and distribution of oil and gas. The fund closed at $129.73 on 6 November 2026, with a net asset value of $129.79. It is listed on Cboe BZX, and it holds 47 positions across the sector.

Fund detail

Data (as stated on the fund page)

Exchange

Cboe BZX

Closing price (6 Nov 2026)

$129.73

Net asset value (6 Nov 2026)

$129.79

Net assets (6 Nov 2026)

$817.7 million

Expense ratio

0.37%

Number of holdings

47

Benchmark index

Dow Jones U.S. Select Oil Exploration & Production Index

Fund inception

1 May 2006

Distribution frequency

Quarterly

30-day SEC Yield (30 Sep 2026)

1.64%

Holdings and weighting

ConocoPhillips is the largest position at 18.87% of market value, followed by Marathon Petroleum at 12.07% and Valero Energy at 11.50%. EOG Resources, Phillips 66, EQT, Diamondback Energy, Devon Energy, Expand Energy and Permian Resources complete the leading names.

Several of the largest holdings are refiners, which means the portfolio includes companies beyond pure exploration and production. The index design determines these weights, and they can differ from the fund's sector label.

Costs and trading

The expense ratio is 0.37%. The fund had 6.3 million shares outstanding on 6 November 2026, and its 30-day median bid-ask spread was 0.07%. The premium or discount recorded that day was -0.05%.

Yield and structure

The fund pays distributions quarterly. Its 30-day SEC yield as of 30 September 2026 was 1.64%, and its price-to-earnings ratio stood at 19.54 as of 5 November 2026. The fund's inception date is 1 May 2006.

Final Word

IEO provides a concentrated route into U.S. oil and gas companies, with the largest positions weighted toward a small group of large producers and refiners. Its future composition will depend on the index methodology and the companies' own disclosures.