FOKFX vs. VIIIX

Last updated Aug 1, 2026

FOKFX (Fidelity OTC K6 Portfolio) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both mutual funds - FOKFX is a Large Cap Growth Equities fund managed by Fidelity, while VIIIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 5 years, FOKFX returned 14.43%/yr vs 12.83%/yr for VIIIX. Their correlation of 0.91 means they have usually moved in the same direction. FOKFX charges 0.50%/yr vs 0.02%/yr for VIIIX.

Performance

FOKFX vs. VIIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity OTC K6 Portfolio (FOKFX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FOKFX achieves a 17.71% return, which is significantly higher than VIIIX's 9.35% return.

FOKFX

• 1D: 2.72%
• 1M: -3.54%
• 6M: 15.23%
• YTD: 17.71%
• 1Y: 33.55%
• 3Y*: 26.35%
• 5Y*: 14.43%
• 10Y*: —
• ALL TIME*: 21.57%

VIIIX

• 1D: 1.66%
• 1M: -0.56%
• 6M: 7.79%
• YTD: 9.35%
• 1Y: 20.63%
• 3Y*: 19.44%
• 5Y*: 12.83%
• 10Y*: 15.07%
• ALL TIME*: 9.41%

*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)
FOKFX Fidelity OTC K6 Portfolio	$0.00	$0.00	$0.00
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	$0.00	$0.00	$0.00

FOKFX vs. VIIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
FOKFX Fidelity OTC K6 Portfolio	17.71%	20.30%	34.58%	43.48%	-32.32%	25.95%	47.52%	17.08%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	9.35%	17.87%	26.29%	25.79%	-18.14%	28.69%	18.41%	13.39%

Correlation

The correlation between FOKFX and VIIIX is 0.90, 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.	0.90
Correlation (3Y) Balances recent behavior with more history.	0.89
Correlation (5Y) Shows whether the relationship held over a longer period.	0.92
Correlation (All Time) Calculated using the full available price history since Jun 13, 2019	0.91

The correlation between FOKFX and VIIIX has been stable across timeframes, ranging from 0.89 to 0.92 - a consistent structural relationship.

Return for Risk

FOKFX vs. VIIIX — Risk / Return Rank

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

FOKFX

FOKFX Risk / Return Rank: 66
FOKFX Sharpe Ratio Rank: 63
FOKFX Sortino Ratio Rank: 58
FOKFX Omega Ratio Rank: 57
FOKFX Calmar Ratio Rank: 79
FOKFX Martin Ratio Rank: 72

VIIIX

VIIIX Risk / Return Rank: 63
VIIIX Sharpe Ratio Rank: 61
VIIIX Sortino Ratio Rank: 58
VIIIX Omega Ratio Rank: 58
VIIIX Calmar Ratio Rank: 65
VIIIX Martin Ratio Rank: 76

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.

FOKFX vs. VIIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity OTC K6 Portfolio (FOKFX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). 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.

	FOKFX	VIIIX	Difference
Sharpe ratio: Return per unit of total volatility	1.48	1.43	+0.05
Sortino ratio: Return per unit of downside risk	2.03	2.00	+0.03
Omega ratio: Gain probability vs. loss probability	1.26	1.26	0.00
Calmar ratio: Return relative to maximum drawdown	2.53	2.06	+0.46
Martin ratio: Return relative to average drawdown	8.60	8.86	-0.25

FOKFX vs. VIIIX - Sharpe Ratio Comparison

The current FOKFX Sharpe Ratio is 1.48, which is comparable to the VIIIX Sharpe Ratio of 1.43. The chart below compares the historical Sharpe Ratios of FOKFX and VIIIX, 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

FOKFX vs. VIIIX - Drawdown Comparison

The maximum FOKFX drawdown since its inception was -37.26%, smaller than the maximum VIIIX drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for FOKFX and VIIIX.

Drawdown Indicators

	FOKFX	VIIIX	Difference
Max Drawdown Largest peak-to-trough decline	-37.26%	-55.18%	+17.92%
Max Drawdown (1Y) Largest decline over 1 year	-12.53%	-8.90%	-3.63%
Max Drawdown (3Y) Largest decline over 3 years	-24.81%	-18.75%	-6.06%
Max Drawdown (5Y) Largest decline over 5 years	-37.26%	-24.50%	-12.76%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.79%	—
Current Drawdown Current decline from peak	-8.04%	-2.11%	-5.93%
Average Drawdown Average peak-to-trough decline	-9.09%	-9.97%	+0.88%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.67%	2.07%	+1.60%

Volatility

FOKFX vs. VIIIX - Volatility Comparison

Fidelity OTC K6 Portfolio (FOKFX) has a higher volatility of 6.26% compared to Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) at 3.44%. This indicates that FOKFX's price experiences larger fluctuations and is considered to be riskier than VIIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FOKFX	VIIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.26%	3.44%	+2.82%
Volatility (6M) Calculated over the trailing 6-month period	17.69%	10.09%	+7.60%
Volatility (1Y) Calculated over the trailing 1-year period	21.42%	12.86%	+8.56%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.47%	17.01%	+6.46%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	24.72%	18.07%	+6.65%

FOKFX vs. VIIIX - Expense Ratio Comparison

FOKFX has a 0.50% expense ratio, which is higher than VIIIX's 0.02% expense ratio.

Dividends

FOKFX vs. VIIIX - Dividend Comparison

FOKFX's dividend yield for the trailing twelve months is around 3.57%, more than VIIIX's 2.51% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FOKFX Fidelity OTC K6 Portfolio	3.57%	4.20%	4.58%	0.24%	0.08%	3.81%	0.39%	0.32%	0.00%	0.00%	0.00%	0.00%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	2.51%	2.11%	3.66%	2.66%	3.39%	4.79%	3.07%	2.86%	2.45%	1.84%	2.38%	2.47%

Frequently Asked Questions

Can I hold both FOKFX and VIIIX in my portfolio?

With a correlation of 0.90, FOKFX and VIIIX 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, FOKFX or VIIIX?

FOKFX has higher volatility (6.26%) compared to VIIIX (3.44%). In terms of maximum drawdown, FOKFX dropped -37.26% vs VIIIX's -55.18%.

Which has better risk-adjusted returns?

FOKFX currently has the higher Sharpe Ratio (1.48 vs 1.43), 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.