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Performance
Performance Chart
The chart shows the growth of an initial investment of $10,000 in William Blair Institutional International Growth Fund, comparing it to the performance of the S&P 500 index or another benchmark. All prices have been adjusted for splits and dividends.
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Returns By Period
William Blair Institutional International Growth Fund (WBIIX) has returned -3.55% so far this year and 13.88% over the past 12 months. Over the last ten years, WBIIX has returned 7.09% per year, falling short of the S&P 500 Index benchmark, which averaged 12.16% annually.
William Blair Institutional International Growth Fund
- 1D
- -1.14%
- 1M
- -12.89%
- YTD
- -3.55%
- 6M
- -1.60%
- 1Y
- 13.88%
- 3Y*
- 7.44%
- 5Y*
- 1.27%
- 10Y*
- 7.09%
Benchmark (S&P 500 Index)
- 1D
- 2.91%
- 1M
- -5.09%
- YTD
- -4.63%
- 6M
- -2.39%
- 1Y
- 16.33%
- 3Y*
- 16.69%
- 5Y*
- 10.18%
- 10Y*
- 12.16%
Monthly Returns
Based on dividend-adjusted daily data since Jul 29, 2002, WBIIX's average daily return is +0.04%, while the average monthly return is +0.73%. At this rate, your investment would double in approximately 7.9 years.
Historically, 62% of months were positive and 38% were negative. The best month was May 2009 with a return of +15.2%, while the worst month was Oct 2008 at -25.9%. The longest winning streak lasted 12 consecutive months, and the longest losing streak was 6 months.
On a daily basis, WBIIX closed higher 53% of trading days. The best single day was Oct 13, 2008 with a return of +11.8%, while the worst single day was Mar 16, 2020 at -11.4%.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 5.71% | 4.74% | -12.89% | -3.55% | |||||||||
| 2025 | 3.43% | -0.63% | -2.62% | 4.08% | 5.39% | 3.05% | -2.13% | 1.38% | 3.18% | 1.70% | -2.17% | 2.54% | 18.16% |
| 2024 | -0.76% | 4.69% | 2.54% | -5.48% | 3.66% | 0.20% | 1.86% | 2.48% | 0.25% | -4.31% | 0.07% | -2.28% | 2.40% |
| 2023 | 7.88% | -2.96% | 3.58% | 0.94% | -1.57% | 3.33% | 0.98% | -4.58% | -5.53% | -3.85% | 11.21% | 6.35% | 15.23% |
| 2022 | -11.40% | -4.39% | -0.50% | -9.16% | -1.24% | -8.27% | 8.94% | -6.12% | -10.22% | 6.52% | 10.30% | -4.31% | -28.39% |
| 2021 | 0.15% | -0.00% | -1.32% | 6.26% | 2.43% | 0.87% | 1.67% | 3.65% | -5.67% | 3.87% | -3.94% | 1.57% | 9.30% |
Benchmark Metrics
William Blair Institutional International Growth Fund has an annualized alpha of 0.95%, beta of 0.79, and R² of 0.65 versus S&P 500 Index. Calculated based on daily prices since July 30, 2002.
- This fund participated in 101.56% of S&P 500 Index downside but only 96.24% of its upside — more exposed to losses than it benefited from rallies.
- Alpha
- 0.95%
- Beta
- 0.79
- R²
- 0.65
- Upside Capture
- 96.24%
- Downside Capture
- 101.56%
Expense Ratio
WBIIX has a high expense ratio of 0.98%, indicating above-average management fees.
Return for Risk
Risk / Return Rank
WBIIX ranks 30 for risk / return — below 30% of mutual funds on our site. The returns aren't fully compensating for the risk involved. This isn't necessarily a dealbreaker, but factor it into your decision — especially if you're risk-averse.
Return / Risk — by metrics
The table below present risk-adjusted performance metrics for William Blair Institutional International Growth Fund (WBIIX) and compare them to a chosen benchmark (S&P 500 Index).
| WBIIX | Benchmark | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 0.76 | 0.90 | -0.13 |
Sortino ratioReturn per unit of downside risk | 1.11 | 1.39 | -0.28 |
Omega ratioGain probability vs. loss probability | 1.17 | 1.21 | -0.04 |
Calmar ratioReturn relative to maximum drawdown | 0.86 | 1.40 | -0.54 |
Martin ratioReturn relative to average drawdown | 3.41 | 6.61 | -3.20 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
Explore WBIIX risk-adjusted metrics in detail
Dive deeper into individual metrics with historical trends, benchmark comparisons, and performance across different time periods.
Dividends
Dividend History
William Blair Institutional International Growth Fund provided a 12.99% dividend yield over the last twelve months, with an annual payout of $1.80 per share. The fund has been increasing its distributions for 2 consecutive years.
| Period | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dividend | $1.80 | $1.80 | $1.03 | $0.36 | $0.84 | $3.15 | $2.57 | $0.17 | $1.57 | $0.75 | $0.17 | $0.19 |
Dividend yield | 12.99% | 12.53% | 7.49% | 2.51% | 6.57% | 16.58% | 12.61% | 0.95% | 11.74% | 4.16% | 1.15% | 1.28% |
Monthly Dividends
The table displays the monthly dividend distributions for William Blair Institutional International Growth Fund. The dividends shown in the table have been adjusted to account for any splits that may have occurred.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | $0.00 | $0.00 | $0.00 | $0.00 | |||||||||
| 2025 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $1.80 | $1.80 |
| 2024 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $1.03 | $1.03 |
| 2023 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.36 | $0.36 |
| 2022 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.84 | $0.84 |
| 2021 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $0.00 | $3.15 | $3.15 |
Drawdowns
Drawdowns Chart
The Drawdowns chart displays portfolio losses from any high point along the way. Drawdowns are calculated considering price movements and all distributions paid, if any.
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Worst Drawdowns
The table below displays the maximum drawdowns of the William Blair Institutional International Growth Fund. A maximum drawdown is a measure of risk, indicating the largest reduction in portfolio value due to a series of losing trades.
The maximum drawdown for the William Blair Institutional International Growth Fund was 65.13%, occurring on Mar 9, 2009. Recovery took 1520 trading sessions.
The current William Blair Institutional International Growth Fund drawdown is 13.17%.
Depth | Start | To Bottom | Bottom | To Recover | End | Total |
|---|---|---|---|---|---|---|
| -65.13% | Nov 1, 2007 | 339 | Mar 9, 2009 | 1520 | Mar 23, 2015 | 1859 |
| -40.91% | Sep 8, 2021 | 266 | Sep 27, 2022 | 835 | Jan 27, 2026 | 1101 |
| -32.76% | Jan 23, 2020 | 42 | Mar 23, 2020 | 72 | Jul 6, 2020 | 114 |
| -25.63% | Jan 29, 2018 | 229 | Dec 24, 2018 | 251 | Dec 23, 2019 | 480 |
| -22.56% | May 22, 2015 | 184 | Feb 12, 2016 | 316 | May 16, 2017 | 500 |
Volatility
Volatility Chart
The chart below shows the rolling one-month volatility.
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