ABTAX — Government Bond Fund
Data updated: 2026-08-28
ABTAX — Government Bond Fund. Long Total / Aggregate Bond · $454.00M AUM · 0.72% expense ratio. Holdings, fees, performance and SEC filings.
ABTAX Fund Overview
ABTAX — Government Bond Fund is a US mutual fund managed by American Century Government Income Trust, categorised as Long Total / Aggregate Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: American Century Government Income Trust
- Category: Long Total / Aggregate Bond
- Assets under management: $454.00M
- 1-year return: 3.2%
- Ticker: ABTAX
- SEC CIK: 0000773674
- SEC series ID: S000005968
- Share class ID: C000016436
ABTAX Holdings
Top 10 holdings of Government Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| State Street Bank & Trust Co | 3.67% |
| U.s. Treasury | 3.52% |
| U.s. Treasury | 3.31% |
| U.s. Treasury | 3.12% |
| Fannie Mae Pool | 3.08% |
| State of California | 2.88% |
| U.s. Treasury | 2.87% |
| U.s. Treasury | 2.64% |
| Federal National Mortgage Association | 1.90% |
| U.s. Treasury | 1.77% |
ABTAX Portfolio Allocation
Asset-class allocation of Government Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Securitized | 56.1% |
| Fixed Income | 44.1% |
| Cash & Equivalents | 3.7% |
| Real Estate | 0.2% |
ABTAX Performance
Total returns for ABTAX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.3% |
| 1 year | 3.2% |
| 3 years (annualised) | 3.2% |
| 5 years (annualised) | -0.7% |
ABTAX Risk Information
Risk metrics for ABTAX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.1%
ABTAX Costs and Fees
ABTAX costs about $72 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.72%
- Gross expense ratio: 0.72%
- Portfolio turnover: 218%
- Brokerage commissions: 0.49 bps of average net assets (SEC N-CEN)
ABTAX Cashflows
Over the 12 months to 2026-06, Government Bond Fund had net outflows of $125.88M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$484.88K |
| 2026-05 | −$4.36M |
| 2026-04 | −$5.20M |
| 2026-03 | $2.10M |
| 2026-02 | −$4.75M |
| 2026-01 | −$10.52M |
ABTAX Debt Constituents
Largest debt holdings of Government Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| U.s. Treasury | 3.52% |
| U.s. Treasury | 3.31% |
| U.s. Treasury | 3.12% |
| State of California | 2.88% |
| U.s. Treasury | 2.87% |
| U.s. Treasury | 2.64% |
| U.s. Treasury | 1.77% |
| U.s. Treasury | 1.53% |
| U.s. Treasury | 1.53% |
| U.s. Treasury | 1.52% |
ABTAX Prospectus and SEC Filings
Official Government Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-07-29
- Prospectus (485BPOS) — filed 2025-07-29
- Prospectus (485BPOS) — filed 2024-07-29
- Portfolio holdings (N-PORT) — filed 2026-08-28
- Portfolio holdings (N-PORT) — filed 2026-05-29
- Portfolio holdings (N-PORT) — filed 2026-02-27
- Annual census (N-CEN) — filed 2026-06-11
- Annual census (N-CEN) — filed 2025-06-11
Related Funds
Other Long Total / Aggregate 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.