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ISIN
US0250813088
CUSIP
025081308
Inception Date
May 15, 1980
Min. Investment
$2,500
Distribution Policy
Distributing
Asset Class
Bond
Assets Under Management
$460M

Share Price Chart


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Performance

CPTNX Performance Chart

American Century Government Bond Fund (CPTNX) is up 0.0% since the beginning of the year. CPTNX is currently trading at $9 per share. Investors who bought $1,000 worth of CPTNX shares 5 years ago would now be looking at an investment worth $968.


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S&P 500 Index

Returns By Period

American Century Government Bond Fund (CPTNX) has returned -0.00% so far this year and 4.51% over the past 12 months. Over the last ten years, CPTNX has returned 0.83% per year, falling short of the S&P 500 Index benchmark, which averaged 13.88% annually.


American Century Government Bond Fund

1D
0.22%
1M
0.88%
YTD
-0.00%
6M
0.33%
1Y
4.51%
3Y*
3.23%
5Y*
-0.65%
10Y*
0.83%

Benchmark (S&P 500 Index)

1D
-0.37%
1M
-0.01%
YTD
9.16%
6M
8.64%
1Y
25.22%
3Y*
19.78%
5Y*
11.99%
10Y*
13.88%
*Multi-year figures are annualized to reflect compound growth (CAGR)

CPTNX Monthly Returns History

Based on dividend-adjusted daily data since May 16, 1980, CPTNX's average daily return is +0.02%, while the average monthly return is +0.43%. At this rate, an investment would double in approximately 13.5 years.

Historically, 64% of months were positive and 36% were negative. The best month was Nov 1981 with a return of +4.7%, while the worst month was Dec 1986 at -4.7%. The longest winning streak lasted 11 consecutive months, and the longest losing streak was 6 months.

On a daily basis, CPTNX closed higher 43% of trading days. The best single day was Oct 22, 1987 with a return of +5.7%, while the worst single day was Dec 31, 1986 at -4.5%.


JanFebMarAprMayJunJulAugSepOctNovDecTotal
20260.22%1.68%-1.78%0.00%0.01%-0.11%0.00%
20250.57%2.30%-0.08%0.66%-1.03%1.53%-0.41%1.42%0.88%0.76%0.66%-0.19%7.26%
2024-0.31%-1.57%0.67%-2.65%1.71%1.09%2.41%1.52%1.16%-2.98%1.11%-1.68%0.32%
20232.98%-2.67%2.73%0.38%-1.32%-0.92%-0.44%-0.74%-2.88%-1.76%4.41%4.04%3.51%
2022-1.59%-0.62%-2.69%-2.94%0.09%-1.36%1.77%-2.78%-4.28%-1.63%3.26%-0.94%-13.10%
2021-0.43%-1.01%-0.91%0.69%0.06%0.33%1.12%-0.23%-0.70%-0.09%0.27%-0.33%-1.24%

Benchmark Metrics

American Century Government Bond Fund has an annualized alpha of 5.43%, beta of -0.01, and R2 of 0.00 versus S&P 500 Index. Calculated based on daily prices since May 16, 1980.

  • This fund captured 12.49% of S&P 500 Index gains and tended to rise during its downturns (downside capture of -10.26%) - a profile typical of hedging or uncorrelated assets.
  • Beta of -0.01 may look defensive, but with R2 of 0.00 this fund is largely uncorrelated with S&P 500 Index - low beta reflects independence, not downside protection. See the Volatility section for a true picture of this fund's risk.
  • R2 of 0.00 means this fund moves largely independently of S&P 500 Index - capture ratios reflect limited market correlation rather than active downside protection. Consider using a more representative benchmark.

Alpha
5.43%
Beta
-0.01
0.00
Upside Capture
12.49%
Downside Capture
-10.26%

Expense Ratio

CPTNX has an expense ratio of 0.47%, placing it in the medium range.


Return for Risk

Risk / Return Rank

CPTNX ranks 17 for risk / return — in the bottom 17% of mutual funds on our site. This means you're taking on significantly more risk than the returns justify. Consider whether the potential upside is worth the volatility, or explore alternatives with better risk / return profiles.


CPTNX Risk / Return Rank: 1717
Overall Rank
CPTNX Sharpe Ratio Rank: 1818
Sharpe Ratio Rank
CPTNX Sortino Ratio Rank: 1919
Sortino Ratio Rank
CPTNX Omega Ratio Rank: 1717
Omega Ratio Rank
CPTNX Calmar Ratio Rank: 1717
Calmar Ratio Rank
CPTNX Martin Ratio Rank: 1515
Martin Ratio Rank
The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

Return / Risk — by metrics

The table below present risk-adjusted performance metrics for American Century Government Bond Fund (CPTNX) and compare them to S&P 500 Index.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.


CPTNXBenchmarkDifference
Sharpe ratioReturn per unit of total volatility

-0.90

Sortino ratioReturn per unit of downside risk

-1.06

Omega ratioGain probability vs. loss probability

1.20

1.37

-0.17

Calmar ratioReturn relative to maximum drawdown

1.35

2.78

-1.44

Martin ratioReturn relative to average drawdown

3.96

12.44

-8.48

Dividends

Dividend History

American Century Government Bond Fund provided a 4.02% dividend yield over the last twelve months, with an annual payout of $0.37 per share.


2.00%2.50%3.00%3.50%4.00%$0.00$0.10$0.20$0.30$0.4020152016201720182019202020212022202320242025
Dividends
Dividend Yield
PeriodTTM20252024202320222021202020192018201720162015
Dividend$0.37$0.39$0.39$0.36$0.18$0.24$0.24$0.28$0.27$0.23$0.25$0.19

Dividend yield

4.02%4.07%4.22%3.72%1.84%2.10%2.09%2.48%2.49%2.14%2.28%1.69%

Monthly Dividends

The table displays the monthly dividend distributions for American Century Government Bond Fund. The dividends shown in the table have been adjusted to account for any splits that may have occurred.


JanFebMarAprMayJunJulAugSepOctNovDecTotal
2026$0.03$0.03$0.03$0.03$0.03$0.00$0.15
2025$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.39
2024$0.03$0.03$0.03$0.03$0.04$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.39
2023$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.03$0.36
2022$0.01$0.01$0.02$0.02$0.02$0.00$0.00$0.02$0.00$0.02$0.03$0.03$0.18
2021$0.00$0.01$0.02$0.02$0.02$0.02$0.02$0.01$0.01$0.01$0.01$0.09$0.24

Drawdowns

Drawdowns Chart

The Drawdowns chart displays portfolio losses from any high point along the way. Drawdowns are calculated considering price movements and all distributions paid, if any.


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Worst Drawdowns

The table below displays the maximum drawdowns of the American Century Government Bond Fund. A maximum drawdown is a measure of risk, indicating the largest reduction in portfolio value due to a series of losing trades.

The maximum drawdown for the American Century Government Bond Fund was 19.73%, occurring on Oct 19, 2023. The portfolio has not yet recovered.

The current American Century Government Bond Fund drawdown is 5.10%.


Related event

Drawdown

Fall

Recovery

Underwater

2023 correction2023
-19.73%Oct 2023
3y 2mo
5y 10moAug 2020 - now
Black Monday1987
-14.00%Oct 1987
10mo 11d1y 7mo
2y 5moDec 1986 - May 1989
1980 pullback1980
-6.63%Dec 1980
6mo 1d3mo 3d
9mo 4dJun 1980 - Mar 1981
1986 pullback1986
-6.42%Jun 1986
1mo 18d2mo 9d
3mo 27dApr 1986 - Aug 1986
1999 pullback1999
-5.98%Jun 1999
6mo 12d1y 10d
1y 6moDec 1998 - Jul 2000

Drawdown Indicators


CPTNXBenchmarkDifference

Max Drawdown

Largest peak-to-trough decline

-19.73%

-56.78%

+37.05%

Max Drawdown (1Y)

Largest decline over 1 year

-3.36%

-9.10%

+5.74%

Max Drawdown (3Y)

Largest decline over 3 years

-7.26%

-18.90%

+11.64%

Max Drawdown (5Y)

Largest decline over 5 years

-19.15%

-25.43%

+6.28%

Max Drawdown (10Y)

Largest decline over 10 years

-19.73%

-33.92%

+14.19%

Current Drawdown

Current decline from peak

-5.10%

-1.80%

-3.30%

Average Drawdown

Average peak-to-trough decline

-2.29%

-10.71%

+8.42%

Ulcer Index

Depth and duration of drawdowns from previous peaks

1.14%

2.03%

-0.89%

Volatility

Volatility Chart

The chart below shows the rolling one-month volatility.


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Portfolio Analyzer

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