WISIX Performance — William Blair International Small Cap Growth Fund, Class I
Data updated: 2026-08-14
WISIX returned +10.46% year to date and +7.69% over one year to Jun 2026. Annualised returns are +10.62% over 3 years and −0.19% over 5 years. The fund trailed its International Small Growth category average: $100 invested three years ago grew to $135, against $150 for the category, and to $108 over one year, against $119. Volatility over the past three years was 16.69% a year. In the 12 months to Jun 2026 the fund lost a net $52.5M, and assets reached $138.35M.
WISIX Growth of $100
What $100 invested in William Blair International Small Cap Growth Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the International Small Growth category average over the same months.
| Period | WISIX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $108 | $119 |
| 3 years (Jul 2023 – Jun 2026) | $135 | $150 |
| 5 years (Jul 2021 – Jun 2026) | $99 | $118 |
| Since data start (Jul 2019 – Jun 2026) | $155 | $182 |
WISIX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +10.46% |
| 1 year | +7.69% |
| 3 years (annualised) | +10.62% |
| 5 years (annualised) | −0.19% |
WISIX Annual Returns
Calendar-year total returns of William Blair International Small Cap Growth Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +10.46% |
| 2025 | +15.29% |
| 2024 | +0.83% |
| 2023 | +14.70% |
| 2022 | −35.00% |
| 2021 | +11.16% |
| 2020 | +29.04% |
| 2019 (Jul–Dec) | +12.84% |
WISIX Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +2.3% | +4.8% | −8.1% | +12.4% | +3.7% | −3.8% | — | — | — | — | — | — |
| 2025 | +3.3% | −0.9% | −1.3% | +7.0% | +5.9% | +3.3% | −2.5% | +1.6% | +0.2% | −2.3% | −0.5% | +1.1% |
| 2024 | −3.6% | +2.4% | +0.3% | −4.2% | +3.1% | +0.2% | +3.6% | +3.3% | +1.1% | −5.1% | +1.8% | −1.6% |
| 2023 | +7.0% | −2.1% | +2.5% | +1.6% | −1.5% | +1.4% | +2.0% | −4.5% | −5.2% | −6.8% | +13.5% | +7.9% |
| 2022 | −15.4% | −6.3% | 0.0% | −10.7% | −1.8% | −12.1% | +10.7% | −5.7% | −10.8% | +6.2% | +11.7% | −3.7% |
| 2021 | −1.3% | +0.1% | −1.1% | +7.3% | +1.0% | +1.6% | +3.3% | +5.5% | −4.9% | +3.3% | −4.8% | +1.6% |
| 2020 | −1.9% | −7.9% | −17.0% | +13.2% | +11.8% | +2.3% | +7.5% | +5.0% | +0.6% | −2.8% | +11.3% | +8.2% |
| 2019 | — | — | — | — | — | — | −1.2% | −1.9% | +1.7% | +4.8% | +4.1% | +4.9% |
WISIX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 16.69%
- 3-year Sharpe ratio: 0.37 (vs 4.5% risk-free rate)
- Best month: +13.52% (Nov 2023)
- Worst month: −8.10% (Mar 2026)
WISIX Fund Flows
Monthly money in and out of William Blair International Small Cap Growth Fund, from SEC Form N-PORT.
- 12-month net flow: −$52.5M
- 12-month gross sales (incl. reinvestments): $7.3M
- Sales ÷ redemptions: 0.12×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $186K | $401K | −$215K |
| May 2026 | $385K | $3.8M | −$3.4M |
| Apr 2026 | $308K | $1.0M | −$725K |
| Mar 2026 | $1.9M | $2.1M | −$197K |
| Feb 2026 | $485K | $980K | −$495K |
| Jan 2026 | $597K | $932K | −$334K |
| Dec 2025 | $1.3M | $2.2M | −$879K |
| Nov 2025 | $619K | $2.0M | −$1.3M |
| Oct 2025 | $248K | $16.2M | −$15.9M |
| Sep 2025 | $186K | $1.8M | −$1.6M |
| Aug 2025 | $442K | $27.7M | −$27.2M |
| Jul 2025 | $580K | $828K | −$248K |
WISIX Assets Under Management
Net assets of William Blair International Small Cap Growth Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $138.35M |
| 2026-03-31 | $127.32M |
| 2025-12-31 | $130.25M |
| 2025-09-30 | $151.83M |
| 2025-06-30 | $182.19M |
| 2025-03-31 | $159.47M |
| 2024-12-31 | $160.77M |
| 2024-09-30 | $202.97M |
| 2024-06-30 | $210.21M |
| 2024-03-31 | $235.24M |
| 2023-12-31 | $240.74M |
| 2023-09-30 | $214.29M |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.