WBSIX Mutual Fund

NAV$38.51

AUM$556M

TER0.99%

Holdings91

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WBSIX Mutual Fund

NAV$38.51

William Blair Small Cap Growth Fund Class I

AUM$556M

TER0.99%

Holdings91

See how much of WBSIX you already own

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Overview Performance Chart Dividends Top Holdings All Holdings Sectors Geography Similar Compare Overlap

Showing top 50 of 91 holdings · as of Aug 31, 2026

WBSIX holdings, by weight
#	Ticker	Name	Weight	Cumulative	Shares	Mkt value	Sector	Industry
1	Debt	Fixed Inc Clearing Corp.Repo	4.38%	4.4%	52,435,905	$52.44M	-	-
2	MMSI	Merit Medical Systems IncHealth Care · Healthcare Equip.	2.05%	6.4%	271,180	$24.59M	Health Care	Healthcare Equip.
Sector and industry · Pro
3	TWST	Twist Bioscience Corp.	1.96%	8.4%	169,074	$23.50M
4	KRYS	Krystal Biotech Inc	1.80%	10.2%	59,988	$21.56M
5	DBD	Diebold Nixdorf	1.79%	12.0%	316,882	$21.50M
6	ESTC	Elastic N.V. Ordinary Shares	1.69%	13.7%	207,470	$20.24M
7	APPF	Appfolio Inc - A	1.68%	15.3%	86,060	$20.16M
8	BWA	BorgWarner Inc	1.66%	17.0%	309,870	$19.88M
9	OSIS	Osi Systems Inc	1.63%	18.6%	94,060	$19.56M
10	BCPC	Balchem Corp	1.61%	20.2%	109,410	$19.24M
11	PRMB	Primo Brands Corp-A	1.61%	21.9%	844,826	$19.28M
12	VCEL	Vericel Corp	1.60%	23.5%	479,954	$19.15M
13	QTWO	Q2 Holdings, Inc.	1.57%	25.0%	289,394	$18.82M
14	RGEN	Repligen Corp	1.56%	26.6%	103,183	$18.67M
15	STEP	Stepstone Group Lp	1.56%	28.1%	358,209	$18.72M
16	LOPE	Grand Canyon Education Inc	1.53%	29.7%	123,951	$18.36M
17	WFRD	Weatherford International Plc	1.51%	31.2%	185,120	$18.10M
18	PI	Impinj Inc	1.50%	32.7%	103,400	$18.02M
19	NBHC	National Bank Holdings Corp Class A	1.46%	34.1%	423,280	$17.48M
20	VCYT	Veracyte, Inc.	1.45%	35.6%	402,733	$17.39M
21	FLS	Flowserve Corp.	1.44%	37.0%	218,810	$17.31M
22	HALO	Halozyme Therapeutics Inc	1.43%	38.5%	160,640	$17.11M
23	—	Quaker Chemical Corp.	1.38%	39.9%	99,867	$16.56M
24	AGYS	Agilysys Inc	1.37%	41.2%	141,090	$16.42M
25	HQY	Healthequity Inc	1.35%	42.6%	167,440	$16.16M
26	—	Firstservice Corp.	1.33%	43.9%	114,507	$15.96M
27	VSH	Vishay Intertechnology Inc	1.33%	45.2%	524,430	$15.96M
28	MIRM	Mirum Pharmaceuticals, Inc.	1.31%	46.5%	160,303	$15.72M
29	—	Marex Group Plc	1.30%	47.8%	215,140	$15.59M
30	KNX	Knight-Swift Transportation Holdings Inc	1.28%	49.1%	223,150	$15.29M
31	BANR	Banner Corp_None_0	1.24%	50.4%	212,140	$14.88M
32	ESTA	Establishment Labs Holdings Inc	1.23%	51.6%	212,710	$14.75M
33	BWIN	The Baldwin Insurance Group Inc	1.22%	52.8%	474,061	$14.62M
34	CGNX	Cognex Corp -	1.22%	54.0%	239,490	$14.60M
35	NOVT	Novanta Inc.	1.20%	55.2%	98,400	$14.39M
36	MDGL	Madrigal Pharmaceuticals Inc	1.19%	56.4%	26,348	$14.23M
37	TEX	Terex Corp	1.18%	57.6%	221,810	$14.09M
38	BSY	Bentley Systems Inc Class B	1.16%	58.8%	376,534	$13.84M
39	ESAB	ESAB Corp	1.10%	59.9%	175,450	$13.23M
40	JCAP	Jefferson Capital Inc	1.09%	60.9%	629,387	$13.10M
41	PTCT	Ptc Therapeutics Inc	1.07%	62.0%	184,790	$12.85M
42	RVLV	Revolve Group Inc	1.05%	63.1%	564,277	$12.54M
43	FRPT	Freshpet, Inc.	1.04%	64.1%	177,780	$12.42M
44	—	Colliers International Group, Inc.	1.02%	65.1%	121,310	$12.21M
45	CYTK	Cytokinetics Inc	1.02%	66.1%	173,110	$12.28M
46	ETSY	Etsy Inc	1.01%	67.2%	148,100	$12.04M
47	LFUS	Littelfuse Inc	0.99%	68.1%	28,690	$11.83M
48	USPH	Us Physical Therapy Inc	0.99%	69.1%	152,232	$11.83M
49	JBTM	Jbt Marel Corp	0.96%	70.1%	98,400	$11.50M
50	—	Mercury Computer Sys	0.96%	71.1%	132,288	$11.55M
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Not reported for this fund: share changes.

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WBSIX Mutual Fund All Holdings

WBSIX holdings total 91 positions. The top 10 holdings account for 20.2% of the fund, led by Fixed Inc Clearing Corp.Repo at 4.4%, Merit Medical Systems Inc at 2.0%, Twist Bioscience Corp. at 2.0%.

WBSIX portfolio concentration is well-diversified, with the top 10 representing 20.2% of total assets. The largest sector exposure is Health Care at 26.2%.

WBSIX sectors provide a detailed breakdown. WBSIX overlap shows how holdings compare to other funds in your portfolio.