FGDKX vs. AMRGX

Last updated Aug 1, 2026

FGDKX (Fidelity Growth Discovery Fund Class K) and AMRGX (American Growth Fund Series One) are both Large Cap Growth Equities funds. Over the past 10 years, FGDKX returned 17.80%/yr vs 11.79%/yr for AMRGX. Their correlation of 0.85 means they have usually moved in the same direction. FGDKX charges 0.68%/yr vs 4.07%/yr for AMRGX.

Performance

FGDKX vs. AMRGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Growth Discovery Fund Class K (FGDKX) and American Growth Fund Series One (AMRGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FGDKX achieves a 6.22% return, which is significantly lower than AMRGX's 17.06% return. Over the past 10 years, FGDKX has outperformed AMRGX with an annualized return of 17.80%, while AMRGX has yielded a comparatively lower 11.79% annualized return.

FGDKX

• 1D: 2.84%
• 1M: -3.44%
• 6M: 5.12%
• YTD: 6.22%
• 1Y: 13.66%
• 3Y*: 19.29%
• 5Y*: 11.77%
• 10Y*: 17.80%
• ALL TIME*: 12.96%

AMRGX

• 1D: 2.55%
• 1M: -0.50%
• 6M: 12.78%
• YTD: 17.06%
• 1Y: 37.70%
• 3Y*: 17.59%
• 5Y*: 9.71%
• 10Y*: 11.79%
• ALL TIME*: 2.94%

*Multi-year figures are annualized to reflect compound growth (CAGR)

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
AMRGX American Growth Fund Series One	$0.00	$0.00	$0.00
FGDKX Fidelity Growth Discovery Fund Class K	$0.00	$0.00	$0.00

FGDKX vs. AMRGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FGDKX Fidelity Growth Discovery Fund Class K	6.22%	15.23%	30.30%	35.73%	-24.34%	23.03%	43.54%	33.91%	-0.20%	34.68%
AMRGX American Growth Fund Series One	17.06%	11.18%	16.61%	24.38%	-19.93%	15.64%	18.65%	36.73%	-9.07%	13.37%

Correlation

The correlation between FGDKX and AMRGX is 0.73, which is moderate. They have sometimes moved together and sometimes differently, sharing some price drivers without tracking each other closely.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.73
Correlation (3Y) Balances recent behavior with more history.	0.78
Correlation (5Y) Shows whether the relationship held over a longer period.	0.83
Correlation (10Y) Provides a long-term view across more market conditions.	0.84
Correlation (All Time) Calculated using the full available price history since May 9, 2008	0.85

The correlation between FGDKX and AMRGX shifts across timeframes, from 0.73 (1 year) to 0.85 (all time), reflecting how their relationship changes across market environments.

Return for Risk

FGDKX vs. AMRGX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

FGDKX

FGDKX Risk / Return Rank: 18
FGDKX Sharpe Ratio Rank: 16
FGDKX Sortino Ratio Rank: 16
FGDKX Omega Ratio Rank: 16
FGDKX Calmar Ratio Rank: 19
FGDKX Martin Ratio Rank: 21

AMRGX

AMRGX Risk / Return Rank: 56
AMRGX Sharpe Ratio Rank: 43
AMRGX Sortino Ratio Rank: 49
AMRGX Omega Ratio Rank: 69
AMRGX Calmar Ratio Rank: 78
AMRGX Martin Ratio Rank: 41

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

FGDKX vs. AMRGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Growth Discovery Fund Class K (FGDKX) and American Growth Fund Series One (AMRGX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

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.

	FGDKX	AMRGX	Difference
Sharpe ratio: Return per unit of total volatility	0.59	1.22	-0.63
Sortino ratio: Return per unit of downside risk	0.93	1.88	-0.95
Omega ratio: Gain probability vs. loss probability	1.11	1.30	-0.18
Calmar ratio: Return relative to maximum drawdown	0.89	2.50	-1.62
Martin ratio: Return relative to average drawdown	2.88	5.86	-2.99

FGDKX vs. AMRGX - Sharpe Ratio Comparison

The current FGDKX Sharpe Ratio is 0.59, which is lower than the AMRGX Sharpe Ratio of 1.22. The chart below compares the historical Sharpe Ratios of FGDKX and AMRGX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

FGDKX vs. AMRGX - Drawdown Comparison

The maximum FGDKX drawdown since its inception was -55.39%, smaller than the maximum AMRGX drawdown of -80.32%. Use the drawdown chart below to compare losses from any high point for FGDKX and AMRGX.

Drawdown Indicators

	FGDKX	AMRGX	Difference
Max Drawdown Largest peak-to-trough decline	-55.39%	-80.32%	+24.93%
Max Drawdown (1Y) Largest decline over 1 year	-12.51%	-13.98%	+1.47%
Max Drawdown (3Y) Largest decline over 3 years	-23.41%	-21.15%	-2.26%
Max Drawdown (5Y) Largest decline over 5 years	-29.75%	-35.42%	+5.67%
Max Drawdown (10Y) Largest decline over 10 years	-31.09%	-35.42%	+4.33%
Current Drawdown Current decline from peak	-8.03%	-5.31%	-2.72%
Average Drawdown Average peak-to-trough decline	-8.63%	-40.05%	+31.42%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.84%	5.91%	-2.07%

Volatility

FGDKX vs. AMRGX - Volatility Comparison

Fidelity Growth Discovery Fund Class K (FGDKX) and American Growth Fund Series One (AMRGX) have volatilities of 6.51% and 6.43%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FGDKX	AMRGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.51%	6.43%	+0.08%
Volatility (6M) Calculated over the trailing 6-month period	15.40%	17.26%	-1.86%
Volatility (1Y) Calculated over the trailing 1-year period	18.81%	28.73%	-9.92%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.77%	22.64%	-1.87%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.75%	21.64%	-0.89%

FGDKX vs. AMRGX - Expense Ratio Comparison

FGDKX has a 0.68% expense ratio, which is lower than AMRGX's 4.07% expense ratio.

Dividends

FGDKX vs. AMRGX - Dividend Comparison

FGDKX's dividend yield for the trailing twelve months is around 1.55%, less than AMRGX's 15.23% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AMRGX American Growth Fund Series One	15.23%	17.82%	12.39%	8.17%	7.77%	12.21%	2.36%	0.00%	0.00%	0.00%	0.00%	0.00%
FGDKX Fidelity Growth Discovery Fund Class K	1.55%	1.65%	12.82%	2.63%	3.69%	13.53%	9.71%	4.37%	5.13%	4.92%	0.15%	0.28%

Frequently Asked Questions

Can I hold both FGDKX and AMRGX in my portfolio?

FGDKX and AMRGX have a correlation of 0.73, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FGDKX or AMRGX?

FGDKX has higher volatility (6.51%) compared to AMRGX (6.43%). In terms of maximum drawdown, FGDKX dropped -55.39% vs AMRGX's -80.32%.

Which has better risk-adjusted returns?

AMRGX currently has the higher Sharpe Ratio (1.22 vs 0.59), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.