BFOCX vs. STK

Last updated Jun 4, 2026

BFOCX (Berkshire Focus Fund) and STK (Columbia Seligman Premium Technology Growth Closed Fund) are both Technology Equities funds. Over the past 10 years, BFOCX returned 22.88%/yr vs 24.60%/yr for STK. A 0.61 correlation means they provide meaningful diversification when combined. BFOCX charges 1.94%/yr vs 1.26%/yr for STK.

Performance

BFOCX vs. STK - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Berkshire Focus Fund (BFOCX) and Columbia Seligman Premium Technology Growth Closed Fund (STK). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with BFOCX having a 60.81% return and STK slightly lower at 59.80%. Over the past 10 years, BFOCX has underperformed STK with an annualized return of 22.88%, while STK has yielded a comparatively higher 24.60% annualized return.

BFOCX

• 1D: -0.27%
• 1M: 19.71%
• YTD: 60.81%
• 6M: 57.53%
• 1Y: 100.22%
• 3Y*: 52.74%
• 5Y*: 13.57%
• 10Y*: 22.88%

STK

• 1D: -0.19%
• 1M: 17.70%
• YTD: 59.80%
• 6M: 57.03%
• 1Y: 116.50%
• 3Y*: 37.51%
• 5Y*: 22.04%
• 10Y*: 24.60%

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

BFOCX vs. STK - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BFOCX Berkshire Focus Fund	60.81%	28.67%	59.16%	50.20%	-65.06%	-1.79%	90.81%	40.56%	10.04%	44.10%
STK Columbia Seligman Premium Technology Growth Closed Fund	59.80%	24.85%	17.74%	46.60%	-30.36%	48.63%	25.39%	52.73%	-14.91%	33.52%

Correlation

The correlation between BFOCX and STK is 0.69, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.69
Correlation (3Y) Calculated over the trailing 3-year period	0.74
Correlation (5Y) Calculated over the trailing 5-year period	0.74
Correlation (10Y) Calculated over the trailing 10-year period	0.68
Correlation (All Time) Calculated using the full available price history since Nov 30, 2009	0.61

The correlation between BFOCX and STK shifts across timeframes, from 0.61 (all time) to 0.74 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

BFOCX vs. STK — Risk / Return Rank

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

BFOCX

BFOCX Risk / Return Rank: 77
BFOCX Sharpe Ratio Rank: 87
BFOCX Sortino Ratio Rank: 55
BFOCX Omega Ratio Rank: 59
BFOCX Calmar Ratio Rank: 96
BFOCX Martin Ratio Rank: 89

STK

STK Risk / Return Rank: 98
STK Sharpe Ratio Rank: 99
STK Sortino Ratio Rank: 97
STK Omega Ratio Rank: 95
STK Calmar Ratio Rank: 98
STK Martin Ratio Rank: 98

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.

BFOCX vs. STK - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Berkshire Focus Fund (BFOCX) and Columbia Seligman Premium Technology Growth Closed Fund (STK). 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.

	BFOCX	STK	Difference
Sharpe ratio: Return per unit of total volatility	2.84	5.11	-2.27
Sortino ratio: Return per unit of downside risk	3.14	5.87	-2.73
Omega ratio: Gain probability vs. loss probability	1.43	1.80	-0.37
Calmar ratio: Return relative to maximum drawdown	6.07	9.12	-3.05
Martin ratio: Return relative to average drawdown	17.65	38.55	-20.90
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BFOCX vs. STK - Sharpe Ratio Comparison

The current BFOCX Sharpe Ratio is 2.84, which is lower than the STK Sharpe Ratio of 5.11. The chart below compares the historical Sharpe Ratios of BFOCX and STK, 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

	BFOCX	STK	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.84	5.11	-2.27
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.31	0.88	-0.57
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.61	0.94	-0.33
Sharpe Ratio (All Time) Calculated using the full available price history	0.26	0.76	-0.50

Drawdowns

BFOCX vs. STK - Drawdown Comparison

The maximum BFOCX drawdown since its inception was -95.80%, which is greater than STK's maximum drawdown of -41.74%. Use the drawdown chart below to compare losses from any high point for BFOCX and STK.

Drawdown Indicators

	BFOCX	STK	Difference
Max Drawdown Largest peak-to-trough decline	-95.80%	-41.74%	-54.06%
Max Drawdown (1Y) Largest decline over 1 year	-17.22%	-12.84%	-4.38%
Max Drawdown (3Y) Largest decline over 3 years	-40.55%	-26.59%	-13.96%
Max Drawdown (5Y) Largest decline over 5 years	-72.53%	-36.27%	-36.26%
Max Drawdown (10Y) Largest decline over 10 years	-72.53%	-41.74%	-30.79%
Current Drawdown Current decline from peak	-0.27%	-0.19%	-0.08%
Average Drawdown Average peak-to-trough decline	-58.17%	-7.41%	-50.76%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.91%	3.03%	+2.88%

Volatility

BFOCX vs. STK - Volatility Comparison

Berkshire Focus Fund (BFOCX) has a higher volatility of 13.22% compared to Columbia Seligman Premium Technology Growth Closed Fund (STK) at 8.47%. This indicates that BFOCX's price experiences larger fluctuations and is considered to be riskier than STK based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BFOCX	STK	Difference
Volatility (1M) Calculated over the trailing 1-month period	13.22%	8.47%	+4.75%
Volatility (6M) Calculated over the trailing 6-month period	29.39%	18.91%	+10.48%
Volatility (1Y) Calculated over the trailing 1-year period	36.86%	22.93%	+13.93%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	43.52%	25.10%	+18.42%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	37.56%	26.13%	+11.43%

BFOCX vs. STK - Expense Ratio Comparison

BFOCX has a 1.94% expense ratio, which is higher than STK's 1.26% expense ratio.

Dividends

BFOCX vs. STK - Dividend Comparison

BFOCX has not paid dividends to shareholders, while STK's dividend yield for the trailing twelve months is around 4.72%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BFOCX Berkshire Focus Fund	0.00%	0.00%	0.00%	0.00%	0.00%	19.54%	21.20%	14.20%	5.70%	21.73%	0.14%	9.52%
STK Columbia Seligman Premium Technology Growth Closed Fund	4.72%	7.38%	16.02%	6.70%	12.62%	8.48%	6.79%	7.86%	14.88%	11.82%	9.87%	10.32%

Frequently Asked Questions

Can I hold both BFOCX and STK in my portfolio?

BFOCX and STK have a correlation of 0.69, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BFOCX or STK?

BFOCX has higher volatility (13.22%) compared to STK (8.47%). In terms of maximum drawdown, BFOCX dropped -95.80% vs STK's -41.74%.

Which has better risk-adjusted returns?

STK currently has the higher Sharpe Ratio (5.11 vs 2.84), 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.