WSMNX — William Blair Small-Mid Cap Growth Fund
Data updated: 2026-05-28
WSMNX — William Blair Small-Mid Cap Growth Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. United States Mid Cap Growth Equity · $1.13B AUM · 1.50% expense ratio · 11.1% 1-yr return. From SEC regulatory filings.
WSMNX Fund Overview
WSMNX — William Blair Small-Mid Cap Growth Fund is a US mutual fund managed by William Blair Funds, categorised as United States Mid Cap Growth Equity. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: William Blair Funds
- Category: United States Mid Cap Growth Equity
- Assets under management: $1.13B
- 1-year return: 11.1%
- Ticker: WSMNX
- SEC CIK: 0000822632
- SEC series ID: S000008603
- Share class ID: C000023542
WSMNX Holdings
Top 10 holdings of William Blair Small-Mid Cap Growth Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Primo Brands Corp | 2.22% |
| Twist Bioscience Corp | 2.16% |
| Lattice Semiconductor Corp | 2.11% |
| BWX Technologies Inc | 2.05% |
| F5 Inc | 2.01% |
| Mueller Industries Inc | 2.01% |
| Akamai Technologies Inc | 2.01% |
| Nextpower Inc | 1.98% |
| Onto Innovation Inc | 1.98% |
| Insmed Inc | 1.92% |
WSMNX Portfolio Allocation
Asset-class allocation of William Blair Small-Mid Cap Growth Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 98.6% |
| Cash & Equivalents | 1.5% |
WSMNX Performance
Total returns for WSMNX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | -2.1% |
| 1 year | 11.1% |
| 3 years (annualised) | 6.9% |
| 5 years (annualised) | 0.6% |
WSMNX Risk Information
Risk metrics for WSMNX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 9.8%
WSMNX Costs and Fees
WSMNX costs about $150 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.50%
- Gross expense ratio: 1.37%
- Portfolio turnover: 57%
- Brokerage commissions: 4.39 bps of average net assets (SEC N-CEN)
WSMNX Cashflows
Over the 12 months to 2026-03, William Blair Small-Mid Cap Growth Fund had net outflows of $471.41M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | −$8.01M |
| 2026-02 | −$57.77M |
| 2026-01 | −$41.11M |
| 2025-12 | −$33.85M |
| 2025-11 | −$54.40M |
| 2025-10 | −$54.55M |
WSMNX Debt Constituents
No individual debt constituents are reported in William Blair Small-Mid Cap Growth Fund's latest SEC N-PORT filing.
WSMNX Prospectus and SEC Filings
Official William Blair Small-Mid Cap Growth Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other United States Mid Cap Growth Equity funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.