FNKFX vs. FTHMX

Last updated Jun 4, 2026

FNKFX (Fidelity Mid-Cap Stock K6 Fund) and FTHMX (FullerThaler Behavioral Mid-Cap Equity Fund Institutional Shares) are both Mid Cap Blend Equities funds. Over the past year, FNKFX returned 30.45% vs 27.99% for FTHMX. Their correlation of 0.93 suggests significant overlap in exposure. FNKFX charges 0.52%/yr vs 0.83%/yr for FTHMX.

Performance

FNKFX vs. FTHMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Mid-Cap Stock K6 Fund (FNKFX) and FullerThaler Behavioral Mid-Cap Equity Fund Institutional Shares (FTHMX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FNKFX achieves a 17.30% return, which is significantly higher than FTHMX's 14.83% return.

FNKFX

• 1D: 1.64%
• 1M: 3.92%
• YTD: 17.30%
• 6M: 17.71%
• 1Y: 30.45%
• 3Y*: 20.76%
• 5Y*: 11.69%
• 10Y*: —

FTHMX

• 1D: 0.59%
• 1M: 2.44%
• YTD: 14.83%
• 6M: 14.83%
• 1Y: 27.99%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

FNKFX vs. FTHMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
FNKFX Fidelity Mid-Cap Stock K6 Fund	17.30%	11.07%	21.99%	10.83%
FTHMX FullerThaler Behavioral Mid-Cap Equity Fund Institutional Shares	14.83%	12.89%	12.48%	11.60%

Correlation

The correlation between FNKFX and FTHMX is 0.89, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.89
Correlation (All Time) Calculated using the full available price history since Oct 3, 2023	0.93

The correlation between FNKFX and FTHMX has been stable across timeframes, ranging from 0.89 to 0.93 - a consistent structural relationship.

Return for Risk

FNKFX vs. FTHMX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

FNKFX

FNKFX Risk / Return Rank: 58
FNKFX Sharpe Ratio Rank: 47
FNKFX Sortino Ratio Rank: 46
FNKFX Omega Ratio Rank: 43
FNKFX Calmar Ratio Rank: 80
FNKFX Martin Ratio Rank: 75

FTHMX

FTHMX Risk / Return Rank: 72
FTHMX Sharpe Ratio Rank: 63
FTHMX Sortino Ratio Rank: 66
FTHMX Omega Ratio Rank: 56
FTHMX Calmar Ratio Rank: 90
FTHMX Martin Ratio Rank: 86

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.

FNKFX vs. FTHMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Mid-Cap Stock K6 Fund (FNKFX) and FullerThaler Behavioral Mid-Cap Equity Fund Institutional Shares (FTHMX). 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.

	FNKFX	FTHMX	Difference
Sharpe ratio: Return per unit of total volatility	2.02	2.35	-0.33
Sortino ratio: Return per unit of downside risk	2.85	3.40	-0.56
Omega ratio: Gain probability vs. loss probability	1.35	1.41	-0.06
Calmar ratio: Return relative to maximum drawdown	3.69	4.69	-1.00
Martin ratio: Return relative to average drawdown	14.28	16.43	-2.15
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FNKFX vs. FTHMX - Sharpe Ratio Comparison

The current FNKFX Sharpe Ratio is 2.02, which is comparable to the FTHMX Sharpe Ratio of 2.35. The chart below compares the historical Sharpe Ratios of FNKFX and FTHMX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	FNKFX	FTHMX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.02	2.35	-0.33
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.62	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.66	1.31	-0.64

Drawdowns

FNKFX vs. FTHMX - Drawdown Comparison

The maximum FNKFX drawdown since its inception was -41.25%, which is greater than FTHMX's maximum drawdown of -20.45%. Use the drawdown chart below to compare losses from any high point for FNKFX and FTHMX.

Drawdown Indicators

	FNKFX	FTHMX	Difference
Max Drawdown Largest peak-to-trough decline	-41.25%	-20.45%	-20.80%
Max Drawdown (1Y) Largest decline over 1 year	-8.67%	-6.33%	-2.34%
Max Drawdown (3Y) Largest decline over 3 years	-21.86%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-21.86%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-4.98%	-3.04%	-1.94%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.23%	1.80%	+0.43%

Volatility

FNKFX vs. FTHMX - Volatility Comparison

Fidelity Mid-Cap Stock K6 Fund (FNKFX) has a higher volatility of 5.13% compared to FullerThaler Behavioral Mid-Cap Equity Fund Institutional Shares (FTHMX) at 3.45%. This indicates that FNKFX's price experiences larger fluctuations and is considered to be riskier than FTHMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FNKFX	FTHMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.13%	3.45%	+1.68%
Volatility (6M) Calculated over the trailing 6-month period	12.49%	9.36%	+3.13%
Volatility (1Y) Calculated over the trailing 1-year period	15.87%	12.65%	+3.22%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.86%	15.43%	+3.43%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.97%	15.43%	+6.54%

FNKFX vs. FTHMX - Expense Ratio Comparison

FNKFX has a 0.52% expense ratio, which is lower than FTHMX's 0.83% expense ratio.

Dividends

FNKFX vs. FTHMX - Dividend Comparison

FNKFX's dividend yield for the trailing twelve months is around 0.50%, more than FTHMX's 0.29% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019
FNKFX Fidelity Mid-Cap Stock K6 Fund	0.50%	0.59%	12.35%	0.99%	2.91%	4.03%	1.45%	0.52%
FTHMX FullerThaler Behavioral Mid-Cap Equity Fund Institutional Shares	0.29%	0.33%	0.28%	0.18%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FNKFX and FTHMX in my portfolio?

FNKFX and FTHMX have a correlation of 0.89, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FNKFX or FTHMX?

FNKFX has higher volatility (5.13%) compared to FTHMX (3.45%). In terms of maximum drawdown, FNKFX dropped -41.25% vs FTHMX's -20.45%.

Which has better risk-adjusted returns?

FTHMX currently has the higher Sharpe Ratio (2.35 vs 2.02), 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.