AFDIX vs. FLCPX

Last updated Aug 4, 2026

AFDIX (American Century Large Cap Equity Fund Investor Class) and FLCPX (Fidelity SAI U.S. Large Cap Index Fund) are both Large Cap Blend Equities funds. Over the past 10 years, AFDIX returned 13.90%/yr vs 15.15%/yr for FLCPX. Their 0.98 correlation means they have historically moved very closely together. AFDIX charges 0.79%/yr vs 0.02%/yr for FLCPX.

Performance

AFDIX vs. FLCPX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Large Cap Equity Fund Investor Class (AFDIX) and Fidelity SAI U.S. Large Cap Index Fund (FLCPX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AFDIX achieves a 7.79% return, which is significantly lower than FLCPX's 10.14% return. Over the past 10 years, AFDIX has underperformed FLCPX with an annualized return of 13.90%, while FLCPX has yielded a comparatively higher 15.15% annualized return.

AFDIX

• 1D: 0.96%
• 1M: 0.29%
• 6M: 6.12%
• YTD: 7.79%
• 1Y: 16.89%
• 3Y*: 14.41%
• 5Y*: 9.39%
• 10Y*: 13.90%
• ALL TIME*: 10.85%

FLCPX

• 1D: 0.71%
• 1M: 0.13%
• 6M: 7.96%
• YTD: 10.14%
• 1Y: 21.47%
• 3Y*: 19.44%
• 5Y*: 12.85%
• 10Y*: 15.15%
• ALL TIME*: 16.15%

*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)
AFDIX American Century Large Cap Equity Fund Investor Class	$0.00	$0.00	$0.00
FLCPX Fidelity SAI U.S. Large Cap Index Fund	$0.00	$0.00	$0.00

AFDIX vs. FLCPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AFDIX American Century Large Cap Equity Fund Investor Class	7.79%	11.17%	19.56%	24.21%	-19.52%	28.66%	19.27%	33.82%	-4.60%	25.78%
FLCPX Fidelity SAI U.S. Large Cap Index Fund	10.14%	17.84%	25.08%	26.25%	-18.06%	28.61%	18.24%	31.59%	-4.38%	21.74%

Correlation

The correlation between AFDIX and FLCPX is 0.99 - they have historically moved very closely together. At this level, their price movements offset little of one another.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.99
Correlation (3Y) Balances recent behavior with more history.	0.98
Correlation (5Y) Shows whether the relationship held over a longer period.	0.98
Correlation (10Y) Provides a long-term view across more market conditions.	0.99
Correlation (All Time) Calculated using the full available price history since Feb 12, 2016	0.99

The correlation between AFDIX and FLCPX has been stable across timeframes, ranging from 0.98 to 0.99 - a consistent structural relationship.

Return for Risk

AFDIX vs. FLCPX — Risk / Return Rank

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

AFDIX

AFDIX Risk / Return Rank: 33
AFDIX Sharpe Ratio Rank: 32
AFDIX Sortino Ratio Rank: 31
AFDIX Omega Ratio Rank: 31
AFDIX Calmar Ratio Rank: 31
AFDIX Martin Ratio Rank: 41

FLCPX

FLCPX Risk / Return Rank: 59
FLCPX Sharpe Ratio Rank: 56
FLCPX Sortino Ratio Rank: 52
FLCPX Omega Ratio Rank: 52
FLCPX Calmar Ratio Rank: 61
FLCPX Martin Ratio Rank: 74

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.

AFDIX vs. FLCPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Large Cap Equity Fund Investor Class (AFDIX) and Fidelity SAI U.S. Large Cap Index Fund (FLCPX). 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.

	AFDIX	FLCPX	Difference
Sharpe ratio: Return per unit of total volatility	1.14	1.53	-0.39
Sortino ratio: Return per unit of downside risk	1.62	2.13	-0.51
Omega ratio: Gain probability vs. loss probability	1.21	1.27	-0.07
Calmar ratio: Return relative to maximum drawdown	1.48	2.22	-0.74
Martin ratio: Return relative to average drawdown	6.35	9.50	-3.15

AFDIX vs. FLCPX - Sharpe Ratio Comparison

The current AFDIX Sharpe Ratio is 1.14, which is comparable to the FLCPX Sharpe Ratio of 1.53. The chart below compares the historical Sharpe Ratios of AFDIX and FLCPX, 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

AFDIX vs. FLCPX - Drawdown Comparison

The maximum AFDIX drawdown since its inception was -52.82%, which is greater than FLCPX's maximum drawdown of -33.87%. Use the drawdown chart below to compare losses from any high point for AFDIX and FLCPX.

Drawdown Indicators

	AFDIX	FLCPX	Difference
Max Drawdown Largest peak-to-trough decline	-52.82%	-33.87%	-18.95%
Max Drawdown (1Y) Largest decline over 1 year	-10.16%	-8.89%	-1.27%
Max Drawdown (3Y) Largest decline over 3 years	-20.56%	-18.76%	-1.80%
Max Drawdown (5Y) Largest decline over 5 years	-26.53%	-24.40%	-2.13%
Max Drawdown (10Y) Largest decline over 10 years	-34.35%	-33.87%	-0.48%
Current Drawdown Current decline from peak	-0.90%	-1.41%	+0.51%
Average Drawdown Average peak-to-trough decline	-7.59%	-4.15%	-3.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.36%	2.07%	+0.29%

Volatility

AFDIX vs. FLCPX - Volatility Comparison

American Century Large Cap Equity Fund Investor Class (AFDIX) has a higher volatility of 3.75% compared to Fidelity SAI U.S. Large Cap Index Fund (FLCPX) at 3.51%. This indicates that AFDIX's price experiences larger fluctuations and is considered to be riskier than FLCPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AFDIX	FLCPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.75%	3.51%	+0.24%
Volatility (6M) Calculated over the trailing 6-month period	10.45%	10.10%	+0.35%
Volatility (1Y) Calculated over the trailing 1-year period	13.20%	12.88%	+0.32%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.47%	17.18%	+0.29%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.62%	18.17%	+0.45%

AFDIX vs. FLCPX - Expense Ratio Comparison

AFDIX has a 0.79% expense ratio, which is higher than FLCPX's 0.02% expense ratio.

Dividends

AFDIX vs. FLCPX - Dividend Comparison

AFDIX's dividend yield for the trailing twelve months is around 21.52%, more than FLCPX's 0.51% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AFDIX American Century Large Cap Equity Fund Investor Class	21.52%	23.20%	6.67%	1.77%	0.63%	2.39%	0.41%	0.63%	8.69%	2.94%	1.18%	1.08%
FLCPX Fidelity SAI U.S. Large Cap Index Fund	0.51%	0.56%	6.11%	7.05%	11.23%	10.38%	3.93%	1.74%	2.18%	1.57%	0.76%	0.00%

Frequently Asked Questions

Can I hold both AFDIX and FLCPX in my portfolio?

With a correlation of 0.99, AFDIX and FLCPX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, AFDIX or FLCPX?

AFDIX has higher volatility (3.75%) compared to FLCPX (3.51%). In terms of maximum drawdown, AFDIX dropped -52.82% vs FLCPX's -33.87%.

Which has better risk-adjusted returns?

FLCPX currently has the higher Sharpe Ratio (1.53 vs 1.14), 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.