iShares U.S. Long Government Bond Index Fund
Data updated: 2026-09-25
C000234049 — iShares U.S. Long Government Bond Index Fund. Long Treasury / Sovereign Bond · $2.65B AUM. Holdings, fees, performance and SEC filings.
C000234049 Fund Overview
iShares U.S. Long Government Bond Index Fund is a US mutual fund managed by Blackrock Funds, categorised as Long Treasury / Sovereign Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Blackrock Funds
- Category: Long Treasury / Sovereign Bond
- Assets under management: $2.65B
- 1-year return: 1.0%
- SEC CIK: 0000844779
- SEC series ID: S000075205
- Share class ID: C000234049
C000234049 Investment Objective and Strategy
iShares U.S. Long Government Bond Index Fund describes its objective and strategy as follows, from its latest prospectus filed with the SEC by Blackrock Funds.
Investment objective
The investment objective of iShares U.S. Long Government Bond Index Fund (the Fund), a series of BlackRock Funds SM (the Trust), is to seek to provide investment results that correspond to the total return performance of fixed-income securities, in aggregate, as represented by the Bloomberg U.S. Government: Long Index (or the Underlying Index).
Principal investment strategy
Under normal circumstances, at least 90% of the value of the Funds assets, plus the amount of any borrowings for investment purposes, is invested in securities comprising the Bloomberg U.S. Government: Long Index, which, for the Fund, are considered bonds issued or guaranteed by the U.S. Government and its agencies or instrumentalities. The Fund attempts to achieve, in both rising and falling markets, a correlation of at least 95% between the total return of its net assets before fees and expenses and the total return of the Funds benchmark index, the Bloomberg U.S. Government: Long Index. Notwithstanding the factors described below, perfect (100%) correlation would be achieved if the total return of the Funds net assets, before fees and expenses, increased or decreased exactly as the total return of the Funds benchmark index increased or decreased.
The Funds ability to match its investment performance to the investment performance of its benchmark index may be affected by, among other things, the Funds expenses, the amount of cash and cash equivalents held by the Fund, the manner in which the total return of the Funds benchmark index is calculated, the size of the Funds investment portfolio, and the timing, frequency and size of shareholder purchases and redemptions. The Bloomberg U.S. Government: Long Index is a capitalization weighted index that measures U.S. dollar-denominated, fixed-rate, nominal U.S. Treasuries and U.S. agency debentures (securities issued by U.S. government owned or government sponsored entities, and debt explicitly guaranteed by the U.S. government) with a maturity equal or greater than ten years. The index is rebalanced monthly.
There were approximately 362 fixed-income securities included in the Bloomberg U.S. Government: Long Index as of December 31, 2025. All securities in the Bloomberg U.S. Government: Long Index are rated investment-grade. The Fund will be invested and reinvested primarily in U.S. debt securities with maturities greater than ten years, with the objective of approximating as closely as practicable the total rate of return of the Bloomberg U.S. Government: Long Index. The dollar-weighted average maturity of the Funds portfolio, under normal circumstances, is expected to be more than ten years. The Fund utilizes sampling techniques that are designed to allow the Fund to duplicate substantially the investment performance of the Bloomberg U.S. Government: Long Index. However, the Fund is not expected to track the Bloomberg U.S.
Government: Long Index with the same degree of accuracy that complete replication of the Bloomberg U.S. Government: Long Index would provide. No attempt is made to manage the Fund using economic, financial or market analysis. In addition, at times, the portfolio composition of the Fund may be altered (or rebalanced) to reflect changes in the characteristics of the index that the Fund tracks. The Fund also may engage in futures, forwards and options transactions and other derivative securities transactions and lend its portfolio securities, each of which involves risk. The Fund may use futures contracts, forwards, options and other derivative transactions to manage its short-term liquidity and/or as substitutes for comparable market positions in the securities in its benchmark index. The Fund may also invest in high-quality money market instruments, including shares of money market funds advised by BFA or its affiliates.
C000234049 Holdings
Top 10 holdings of iShares U.S. Long Government Bond Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| United States Treasury | 2.36% |
| United States Treasury | 2.35% |
| United States Treasury | 2.33% |
| United States Treasury | 2.17% |
| United States Treasury | 2.16% |
| United States Treasury | 2.16% |
| United States Treasury | 2.12% |
| United States Treasury | 2.11% |
| United States Treasury | 2.03% |
| United States Treasury | 2.03% |
C000234049 Portfolio Allocation
Asset-class allocation of iShares U.S. Long Government Bond Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 98.9% |
| Cash & Equivalents | 0.2% |
C000234049 Performance
Total returns for C000234049 (as of 2026-10-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | -0.8% |
| 1 year | 1.0% |
| 3 years (annualised) | -1.8% |
C000234049 Risk Information
Risk metrics for C000234049, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 8.4%
C000234049 Costs and Fees
C000234049 costs about $0 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.00%
- Gross expense ratio: 0.10%
- Portfolio turnover: 33%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
C000234049 Cashflows
Over the 12 months to 2026-04, iShares U.S. Long Government Bond Index Fund had net outflows of $387.52M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-04 | −$26.39M |
| 2026-03 | −$32.90M |
| 2026-02 | $38.41M |
| 2026-01 | −$2.94M |
| 2025-12 | $167.98M |
| 2025-11 | −$3.96M |
C000234049 Debt Constituents
Largest debt holdings of iShares U.S. Long Government Bond Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States Treasury | 2.36% |
| United States Treasury | 2.35% |
| United States Treasury | 2.33% |
| United States Treasury | 2.17% |
| United States Treasury | 2.16% |
| United States Treasury | 2.16% |
| United States Treasury | 2.12% |
| United States Treasury | 2.11% |
| United States Treasury | 2.03% |
| United States Treasury | 2.03% |
C000234049 Prospectus and SEC Filings
Official iShares U.S. Long Government Bond Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-02-23
- Prospectus (485BPOS) — filed 2025-02-26
- Prospectus (485BPOS) — filed 2024-02-22
- Portfolio holdings (N-PORT) — filed 2026-09-25
- Portfolio holdings (N-PORT) — filed 2026-06-25
- Portfolio holdings (N-PORT) — filed 2026-03-26
- Annual census (N-CEN) — filed 2026-01-14
- Annual census (N-CEN) — filed 2025-01-13
Related Funds
Other Long Treasury / Sovereign Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.