THPMX vs. FSMAX

Last updated Aug 1, 2026

THPMX (Thompson MidCap Fund) and FSMAX (Fidelity Extended Market Index Fund) are both Mid Cap Blend Equities funds. Over the past 10 years, THPMX returned 11.04%/yr vs 11.60%/yr for FSMAX. Their correlation of 0.91 means they have usually moved in the same direction. THPMX charges 1.15%/yr vs 0.04%/yr for FSMAX.

Performance

THPMX vs. FSMAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thompson MidCap Fund (THPMX) and Fidelity Extended Market Index Fund (FSMAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, THPMX achieves a 16.70% return, which is significantly higher than FSMAX's 13.84% return. Over the past 10 years, THPMX has underperformed FSMAX with an annualized return of 11.04%, while FSMAX has yielded a comparatively higher 11.60% annualized return.

THPMX

• 1D: -0.41%
• 1M: 0.35%
• 6M: 13.92%
• YTD: 16.70%
• 1Y: 34.90%
• 3Y*: 15.14%
• 5Y*: 9.32%
• 10Y*: 11.04%
• ALL TIME*: 13.08%

FSMAX

• 1D: 1.41%
• 1M: -2.65%
• 6M: 11.17%
• YTD: 13.84%
• 1Y: 23.61%
• 3Y*: 15.94%
• 5Y*: 6.17%
• 10Y*: 11.60%
• ALL TIME*: 12.12%

*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)
FSMAX Fidelity Extended Market Index Fund	$0.00	$0.00	$0.00
THPMX Thompson MidCap Fund	$0.00	$0.00	$0.00

THPMX vs. FSMAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
THPMX Thompson MidCap Fund	16.70%	20.08%	7.70%	17.01%	-14.84%	29.71%	11.97%	33.48%	-21.90%	17.10%
FSMAX Fidelity Extended Market Index Fund	13.84%	11.40%	16.99%	25.36%	-26.44%	12.41%	32.28%	28.01%	-9.44%	18.04%

Correlation

The correlation between THPMX and FSMAX is 0.84, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.84
Correlation (3Y) Balances recent behavior with more history.	0.90
Correlation (5Y) Shows whether the relationship held over a longer period.	0.92
Correlation (10Y) Provides a long-term view across more market conditions.	0.90
Correlation (All Time) Calculated using the full available price history since Sep 8, 2011	0.91

The correlation between THPMX and FSMAX has been stable across timeframes, ranging from 0.84 to 0.92 - a consistent structural relationship.

Return for Risk

THPMX vs. FSMAX — Risk / Return Rank

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

THPMX

THPMX Risk / Return Rank: 84
THPMX Sharpe Ratio Rank: 84
THPMX Sortino Ratio Rank: 82
THPMX Omega Ratio Rank: 78
THPMX Calmar Ratio Rank: 88
THPMX Martin Ratio Rank: 88

FSMAX

FSMAX Risk / Return Rank: 46
FSMAX Sharpe Ratio Rank: 40
FSMAX Sortino Ratio Rank: 41
FSMAX Omega Ratio Rank: 37
FSMAX Calmar Ratio Rank: 62
FSMAX Martin Ratio Rank: 51

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.

THPMX vs. FSMAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thompson MidCap Fund (THPMX) and Fidelity Extended Market Index Fund (FSMAX). 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.

	THPMX	FSMAX	Difference
Sharpe ratio: Return per unit of total volatility	2.06	1.16	+0.91
Sortino ratio: Return per unit of downside risk	2.93	1.70	+1.23
Omega ratio: Gain probability vs. loss probability	1.36	1.20	+0.16
Calmar ratio: Return relative to maximum drawdown	3.20	2.00	+1.19
Martin ratio: Return relative to average drawdown	11.78	6.80	+4.99

THPMX vs. FSMAX - Sharpe Ratio Comparison

The current THPMX Sharpe Ratio is 2.06, which is higher than the FSMAX Sharpe Ratio of 1.16. The chart below compares the historical Sharpe Ratios of THPMX and FSMAX, 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

THPMX vs. FSMAX - Drawdown Comparison

The maximum THPMX drawdown since its inception was -47.55%, smaller than the maximum FSMAX drawdown of -50.55%. Use the drawdown chart below to compare losses from any high point for THPMX and FSMAX.

Drawdown Indicators

	THPMX	FSMAX	Difference
Max Drawdown Largest peak-to-trough decline	-47.55%	-50.55%	+3.00%
Max Drawdown (1Y) Largest decline over 1 year	-9.90%	-10.26%	+0.36%
Max Drawdown (3Y) Largest decline over 3 years	-21.52%	-26.82%	+5.30%
Max Drawdown (5Y) Largest decline over 5 years	-25.29%	-36.31%	+11.02%
Max Drawdown (10Y) Largest decline over 10 years	-47.55%	-50.55%	+3.00%
Current Drawdown Current decline from peak	-1.43%	-3.77%	+2.34%
Average Drawdown Average peak-to-trough decline	-6.71%	-12.06%	+5.35%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.69%	3.02%	-0.33%

Volatility

THPMX vs. FSMAX - Volatility Comparison

Thompson MidCap Fund (THPMX) and Fidelity Extended Market Index Fund (FSMAX) have volatilities of 3.92% and 3.90%, 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

	THPMX	FSMAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.92%	3.90%	+0.02%
Volatility (6M) Calculated over the trailing 6-month period	11.35%	13.31%	-1.96%
Volatility (1Y) Calculated over the trailing 1-year period	15.38%	17.80%	-2.42%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.47%	22.39%	-1.92%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.65%	30.22%	-7.57%

THPMX vs. FSMAX - Expense Ratio Comparison

THPMX has a 1.15% expense ratio, which is higher than FSMAX's 0.04% expense ratio.

Dividends

THPMX vs. FSMAX - Dividend Comparison

THPMX's dividend yield for the trailing twelve months is around 8.13%, more than FSMAX's 0.50% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSMAX Fidelity Extended Market Index Fund	0.50%	0.57%	0.48%	1.17%	1.90%	7.49%	2.14%	4.30%	6.09%	5.44%	4.85%	6.34%
THPMX Thompson MidCap Fund	8.13%	9.48%	8.04%	7.60%	12.04%	9.76%	0.33%	2.93%	7.29%	7.51%	4.84%	9.46%

Frequently Asked Questions

Can I hold both THPMX and FSMAX in my portfolio?

THPMX and FSMAX have a correlation of 0.84, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, THPMX or FSMAX?

THPMX has higher volatility (3.92%) compared to FSMAX (3.90%). In terms of maximum drawdown, THPMX dropped -47.55% vs FSMAX's -50.55%.

Which has better risk-adjusted returns?

THPMX currently has the higher Sharpe Ratio (2.06 vs 1.16), 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.