OTCAX vs. PKSFX

Last updated Apr 2, 2026

Compare and contrast key facts about MFS Mid Cap Growth Fund (OTCAX) and Virtus KAR Small-Cap Core Fund (PKSFX).

OTCAX is managed by MFS. It was launched on Dec 1, 1993. PKSFX is managed by Virtus. It was launched on Oct 18, 1996.

Performance

OTCAX vs. PKSFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Mid Cap Growth Fund (OTCAX) and Virtus KAR Small-Cap Core Fund (PKSFX). The values are adjusted to include any dividend payments, if applicable.

OTCAX vs. PKSFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OTCAX MFS Mid Cap Growth Fund	-6.41%	3.32%	23.47%	21.00%	-28.53%	13.66%	35.34%	37.43%	0.82%	25.95%
PKSFX Virtus KAR Small-Cap Core Fund	1.54%	-2.58%	13.67%	32.32%	-10.77%	19.03%	21.38%	40.21%	-1.99%	34.98%

Returns By Period

In the year-to-date period, OTCAX achieves a -6.41% return, which is significantly lower than PKSFX's 1.54% return. Over the past 10 years, OTCAX has underperformed PKSFX with an annualized return of 11.20%, while PKSFX has yielded a comparatively higher 14.98% annualized return.

OTCAX

• 1D: 3.59%
• 1M: -6.60%
• YTD: -6.41%
• 6M: -10.76%
• 1Y: 2.30%
• 3Y*: 10.38%
• 5Y*: 3.37%
• 10Y*: 11.20%

PKSFX

• 1D: 2.07%
• 1M: -6.10%
• YTD: 1.54%
• 6M: 1.60%
• 1Y: 3.79%
• 3Y*: 10.39%
• 5Y*: 7.79%
• 10Y*: 14.98%

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

OTCAX vs. PKSFX - Expense Ratio Comparison

Both OTCAX and PKSFX have an expense ratio of 1.00%.

OTCAX

MFS Mid Cap Growth Fund

PKSFX

Virtus KAR Small-Cap Core Fund

Return for Risk

OTCAX vs. PKSFX — Risk / Return Rank

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

OTCAX

OTCAX Risk / Return Rank: 7
OTCAX Sharpe Ratio Rank: 7
OTCAX Sortino Ratio Rank: 7
OTCAX Omega Ratio Rank: 7
OTCAX Calmar Ratio Rank: 9
OTCAX Martin Ratio Rank: 8

PKSFX

PKSFX Risk / Return Rank: 10
PKSFX Sharpe Ratio Rank: 8
PKSFX Sortino Ratio Rank: 9
PKSFX Omega Ratio Rank: 8
PKSFX Calmar Ratio Rank: 13
PKSFX Martin Ratio Rank: 10

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.

OTCAX vs. PKSFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Mid Cap Growth Fund (OTCAX) and Virtus KAR Small-Cap Core Fund (PKSFX). 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.

	OTCAX	PKSFX	Difference
Sharpe ratio Return per unit of total volatility	0.15	0.23	-0.08
Sortino ratio Return per unit of downside risk	0.35	0.48	-0.13
Omega ratio Gain probability vs. loss probability	1.05	1.06	-0.01
Calmar ratio Return relative to maximum drawdown	0.18	0.42	-0.24
Martin ratio Return relative to average drawdown	0.51	0.95	-0.44
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OTCAX vs. PKSFX - Sharpe Ratio Comparison

The current OTCAX Sharpe Ratio is 0.15, which is lower than the PKSFX Sharpe Ratio of 0.23. The chart below compares the historical Sharpe Ratios of OTCAX and PKSFX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	OTCAX	PKSFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.15	0.23	-0.08
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.17	0.44	-0.27
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.56	0.80	-0.23
Sharpe Ratio (All Time) Calculated using the full available price history	0.37	0.56	-0.19

Correlation

The correlation between OTCAX and PKSFX is 0.81, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

OTCAX vs. PKSFX - Dividend Comparison

OTCAX's dividend yield for the trailing twelve months is around 17.91%, more than PKSFX's 14.08% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OTCAX MFS Mid Cap Growth Fund	17.91%	16.76%	15.59%	0.00%	0.00%	3.64%	0.83%	0.86%	4.70%	8.80%	5.67%	2.84%
PKSFX Virtus KAR Small-Cap Core Fund	14.08%	14.30%	4.07%	4.12%	6.65%	12.05%	7.45%	4.03%	4.33%	0.17%	5.69%	19.83%

Drawdowns

OTCAX vs. PKSFX - Drawdown Comparison

The maximum OTCAX drawdown since its inception was -74.39%, which is greater than PKSFX's maximum drawdown of -54.46%. Use the drawdown chart below to compare losses from any high point for OTCAX and PKSFX.

Drawdown Indicators

	OTCAX	PKSFX	Difference
Max Drawdown Largest peak-to-trough decline	-74.39%	-54.46%	-19.93%
Max Drawdown (1Y) Largest decline over 1 year	-16.46%	-11.21%	-5.25%
Max Drawdown (5Y) Largest decline over 5 years	-36.85%	-22.02%	-14.83%
Max Drawdown (10Y) Largest decline over 10 years	-36.85%	-33.45%	-3.40%
Current Drawdown Current decline from peak	-13.46%	-9.42%	-4.04%
Average Drawdown Average peak-to-trough decline	-23.21%	-7.17%	-16.04%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.84%	4.96%	+0.88%

Volatility

OTCAX vs. PKSFX - Volatility Comparison

MFS Mid Cap Growth Fund (OTCAX) has a higher volatility of 7.09% compared to Virtus KAR Small-Cap Core Fund (PKSFX) at 4.62%. This indicates that OTCAX's price experiences larger fluctuations and is considered to be riskier than PKSFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OTCAX	PKSFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.09%	4.62%	+2.47%
Volatility (6M) Calculated over the trailing 6-month period	13.06%	11.11%	+1.95%
Volatility (1Y) Calculated over the trailing 1-year period	20.72%	18.95%	+1.77%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.13%	17.90%	+2.23%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.89%	18.79%	+1.10%