William Blair Small Cap Growth Fund Class I (WBSIX) NASDAQ

Currency In USD

WBSIX Historical Return

If you invested $1000 in William Blair Small Cap Growth Fund Class I (WBSIX) 10 years ago, it would be worth $2,396.18 as of September 12, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $911.84, while $1000 invested 1 year ago would be worth $1,188.93. This corresponds to total returns of 139.62%, -8.82%, 18.89%, respectively, with annualized returns of 9.13%, -1.83%, 18.89%.

Custom investment amounts or purchase dates can also be explored using the Stoculator calculator. Past performance does not guarantee future results.

WBSIX Historical Data

Date Range:

Date	Open	Close	Adj Close	High	Low
September 11, 2026	38.89	38.89	38.89	38.89	38.89
September 10, 2026	38.6	38.6	38.6	38.6	38.6
September 09, 2026	39.02	39.02	39.02	39.02	39.02
September 08, 2026	39.92	39.6	39.6	39.92	39.6
September 04, 2026	39.92	39.92	39.92	39.92	39.92
September 03, 2026	39.96	39.96	39.96	39.96	39.96
September 02, 2026	39.67	39.67	39.67	39.67	39.67
September 01, 2026	39.36	39.36	39.36	39.36	39.36
August 31, 2026	40.05	39.92	39.92	40.05	39.92
August 28, 2026	40.05	40.05	40.05	40.05	40.05
August 27, 2026	40.54	40.54	40.54	40.54	40.54
August 26, 2026	40.5	40.5	40.5	40.5	40.5
August 25, 2026	40.41	40.41	40.41	40.41	40.41
August 24, 2026	40.22	40.22	40.22	40.22	40.22
August 21, 2026	40.67	40.67	40.67	40.67	40.67
August 20, 2026	40.28	40.28	40.28	40.28	40.28
August 19, 2026	40.58	40.9	40.9	40.9	40.58
August 18, 2026	40.58	40.58	40.58	40.58	40.58
August 17, 2026	41.41	41.41	41.41	41.41	41.41
August 14, 2026	41.47	41.62	41.62	41.62	41.47
August 13, 2026	41.47	41.47	41.47	41.47	41.47
August 12, 2026	41.31	41.31	41.31	41.31	41.31
August 11, 2026	41.25	41.25	41.25	41.25	41.25
August 10, 2026	41.21	40.94	40.94	41.21	40.94
August 07, 2026	40.44	40.44	40.44	40.44	40.44
August 06, 2026	40.44	40.44	40.44	40.44	40.44
August 05, 2026	40.87	40.87	40.87	40.87	40.87
August 04, 2026	41.04	41.04	41.04	41.04	41.04
August 03, 2026	40.09	40.09	40.09	40.09	40.09
July 31, 2026	39.27	39.27	39.27	39.27	39.27
July 30, 2026	39.05	39.05	39.05	39.05	39.05
July 29, 2026	39.05	39.05	39.05	39.05	39.05
July 28, 2026	39.82	39.82	39.82	39.82	39.82
July 27, 2026	39.72	39.72	39.72	39.72	39.72
July 23, 2026	39.33	39.33	39.33	39.33	39.33
July 22, 2026	39.63	39.63	39.63	39.63	39.63
July 21, 2026	40.03	40.03	40.03	40.03	40.03
July 20, 2026	39.59	39.59	39.59	39.59	39.59
July 17, 2026	40.04	40.04	40.04	40.04	40.04
July 16, 2026	40.33	40.33	40.33	40.33	40.33
July 15, 2026	39.98	39.98	39.98	39.98	39.98
July 14, 2026	39.98	39.98	39.98	39.98	39.98
July 13, 2026	39.98	39.98	39.98	39.98	39.98
July 10, 2026	40.37	40.37	40.37	40.37	40.37
July 09, 2026	40.6	40.6	40.6	40.6	40.6
July 08, 2026	40.03	40.03	40.03	40.03	40.03
July 07, 2026	40.57	40.57	40.57	40.57	40.57
July 06, 2026	41.4	41.4	41.4	41.4	41.4
July 02, 2026	41.22	41.22	41.22	41.22	41.22
July 01, 2026	41.4	41.4	41.4	41.4	41.4
June 30, 2026	40.88	40.88	40.88	40.88	40.88
June 29, 2026	40.87	40.87	40.87	40.87	40.87
June 26, 2026	40.81	40.81	40.81	40.81	40.81
June 25, 2026	40.14	40.14	40.14	40.14	40.14
June 24, 2026	39.85	39.85	39.85	39.85	39.85
June 23, 2026	40.47	40.47	40.47	40.47	40.47
June 22, 2026	40.37	40.37	40.37	40.37	40.37
June 18, 2026	39.28	39.28	39.28	39.28	39.28
June 17, 2026	39.28	39.28	39.28	39.28	39.28
June 16, 2026	39.75	39.75	39.75	39.75	39.75