BGGIX Performance — William Blair Global Leaders Fund, Class R6
Data updated: 2026-08-14
BGGIX returned +9.81% year to date and +16.58% over one year to Jun 2026. Annualised returns are +12.25% over 3 years and +4.56% over 5 years. Against its Global Large Growth category average the fund came out behind over three years but ahead over one: $100 invested three years ago grew to $141, against $157 for the category, and to $117 over one year, against $114. Volatility over the past three years was 14.66% a year. In the 12 months to Jun 2026 the fund lost a net $29.1M, and assets reached $14.42M.
BGGIX Growth of $100
What $100 invested in William Blair Global Leaders Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Global Large Growth category average over the same months.
| Period | BGGIX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $117 | $114 |
| 3 years (Jul 2023 – Jun 2026) | $141 | $157 |
| 5 years (Jul 2021 – Jun 2026) | $125 | $141 |
| Since data start (Jul 2019 – Jun 2026) | $200 | $216 |
BGGIX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +9.81% |
| 1 year | +16.58% |
| 3 years (annualised) | +12.25% |
| 5 years (annualised) | +4.56% |
BGGIX Annual Returns
Calendar-year total returns of William Blair Global Leaders Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +9.81% |
| 2025 | +15.22% |
| 2024 | +7.79% |
| 2023 | +23.11% |
| 2022 | −29.31% |
| 2021 | +16.89% |
| 2020 | +31.90% |
| 2019 (Jul–Dec) | +9.18% |
BGGIX 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 | +1.7% | −2.2% | −7.4% | +10.0% | +7.6% | +0.8% | — | — | — | — | — | — |
| 2025 | +4.2% | −2.5% | −5.8% | +2.5% | +6.3% | +4.0% | −0.3% | +1.0% | +3.3% | +1.9% | −0.6% | +0.7% |
| 2024 | +0.8% | +6.2% | +1.5% | −5.9% | +3.3% | +2.3% | −0.6% | +1.3% | +1.2% | −2.1% | +3.0% | −3.0% |
| 2023 | +8.1% | −2.1% | +4.9% | +2.3% | −0.2% | +4.8% | +1.0% | −3.7% | −5.5% | −3.2% | +10.1% | +5.8% |
| 2022 | −9.6% | −5.3% | +0.5% | −10.5% | −1.9% | −8.4% | +11.4% | −6.5% | −11.0% | +5.8% | +9.3% | −4.7% |
| 2021 | −2.0% | +2.3% | +0.8% | +6.5% | +1.1% | +2.0% | +3.6% | +3.5% | −6.2% | +6.3% | −5.1% | +3.8% |
| 2020 | 0.0% | −5.6% | −13.1% | +12.4% | +7.5% | +3.2% | +7.5% | +8.1% | −2.1% | −1.8% | +11.1% | +3.9% |
| 2019 | — | — | — | — | — | — | +0.1% | −2.3% | +0.7% | +3.4% | +3.9% | +3.2% |
BGGIX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 14.66%
- 3-year Sharpe ratio: 0.53 (vs 4.5% risk-free rate)
- Best month: +10.13% (Nov 2023)
- Worst month: −7.45% (Mar 2026)
BGGIX Fund Flows
Monthly money in and out of William Blair Global Leaders Fund, from SEC Form N-PORT.
- 12-month net flow: −$29.1M
- 12-month gross sales (incl. reinvestments): $12.3M
- Sales ÷ redemptions: 0.30×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $24K | $362K | −$339K |
| May 2026 | $15K | $435K | −$420K |
| Apr 2026 | $14K | $518K | −$504K |
| Mar 2026 | $33K | $1.2M | −$1.2M |
| Feb 2026 | $39K | $2.0M | −$2.0M |
| Jan 2026 | $546K | $1.0M | −$462K |
| Dec 2025 | $10.8M | $8.4M | $2.4M |
| Nov 2025 | $515K | $1.1M | −$594K |
| Oct 2025 | $37K | $13.5M | −$13.5M |
| Sep 2025 | $149K | $5.0M | −$4.8M |
| Aug 2025 | $35K | $466K | −$431K |
| Jul 2025 | $19K | $7.3M | −$7.3M |
BGGIX Assets Under Management
Net assets of William Blair Global Leaders Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $14.42M |
| 2026-03-31 | $13.21M |
| 2025-12-31 | $18.05M |
| 2025-09-30 | $39.12M |
| 2025-06-30 | $49.97M |
| 2025-03-31 | $47.99M |
| 2024-12-31 | $54.48M |
| 2024-09-30 | $78.93M |
| 2024-06-30 | $103.62M |
| 2024-03-31 | $108.38M |
| 2023-12-31 | $100.19M |
| 2023-09-30 | $94.02M |
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.