William Blair Small Cap Growth Fund Class I
WBSIX
NASDAQ- -
USD
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- -
Capital Structure
FRC
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in mil. unless spec.Working Capital
FRC
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in mil. unless spec.Growth Rates
FRC
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in mil. unless spec.Quarterly Revenue
FRC
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in mil. unless spec.Quarterly Earnings Per Share
FRC
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in mil. unless spec.Quarterly Dividends Per Share
FRC
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in mil. unless spec.- CEO
- Don Schreiber Jr.
- Sector
- Financial Services
- Industry
- Asset Management
- Address
- Chicago, IL 60606 Chicago IL United States of America 08054
- IPO Date
- Dec 27, 1999
- CIK
- 0000822632
- Website
- wbiinvestments.com
- Similar Companies
- Business
- William Blair Small Cap Growth Fund Class I (WBSIX) is an open-end mutual fund that seeks long-term capital appreciation by investing primarily in equity securities of small-cap domestic growth companies, focusing on high-quality firms expected to sustain durable earnings growth beyond market expectations; it employs a differentiated strategy emphasizing valuation sensitivity, contrarian bias, and exposure to smaller-cap opportunities to exploit short-term market inefficiencies. The fund offers Class I shares with a minimum initial investment of $500,000, a net expense ratio of 0.99% (with contractual fee waivers through April 30, 2026), and benchmarks performance against the Russell 2000 Growth Index within the Morningstar Small Growth category; as of October 31, 2025, it manages approximately $1,006 million in total net assets across 92 holdings, with a weighted average market cap of $5.07 billion, median market cap of $3.66 billion, next-12-month P/E ratio of 24.6, and long-term EPS growth projection of 16.4%. Core portfolio allocations include health care (24.7%), industrials (21.4%), and information technology (19.5%), with top holdings such as The Brink's Company (2.1%), Diebold Nixdorf (1.8%), Twist Bioscience Corporation (1.8%), Amicus Therapeutics (1.8%), and Globus Medical (1.8%); market cap diversification features 40.7% in companies over $5.0 billion, 23.9% between $3.0-$5.0 billion, 32.0% between $1.0-$3.0 billion, and 3.4% under $1.0 billion, complemented by 3.6% cash and a trailing 12-month turnover of 87.0%. The fund is managed by Ward Sexton, CFA, Partner (tenure since 1999), and Mark Thompson, CFA, Partner (tenure since 2006), under the advice of William Blair Investment Management, LLC, with shares distributed by William Blair & Company, L.L.C., a member of FINRA/SIPC. Inception date is December 27, 1999, with operations domiciled in the United States and targeted at institutional and eligible long-term investors seeking exposure to small-cap growth equities. William Blair & Company, L.L.C., the firm's distributor and broader parent entity, was founded in 1935 and maintains global headquarters in Chicago, Illinois, with additional offices across the United States and international locations including London, Asia-Pacific, and Europe. The strategy is also available via separate accounts, broadening access beyond mutual fund share classes. Recent developments include sustained portfolio evolution with strong performance contributions from holdings like BWX Technologies (up 51.85% in recent periods) and robust order growth in industrial holdings focused on emissions management and AI data center interconnects as of Q3 2025; the fund reported total net assets growth to $1,006 million by October 31, 2025, alongside a 10-year standard deviation of 19.90% versus the benchmark's 21.12%. No major acquisitions, funding rounds, partnerships, or strategic reorganizations specific to WBSIX were identified in the last 1-2 years, though the broader William Blair organization advised on notable transactions such as smaXtec's pending sale to KKR Growth and Highland Europe, and Varicent's strategic investment from Warburg Pincus in 2025.