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 $2,344.1 as of October 23, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $875.84, while $1000 invested 1 year ago would be worth $1,135.38. This corresponds to total returns of 134.41%, -12.42%, 13.54%, respectively, with annualized returns of 8.89%, -2.62%, 13.54%.

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
October 22, 2026	37.74	37.74	37.74	37.74	37.74
October 21, 2026	37.93	37.93	37.93	37.93	37.93
October 20, 2026	37.76	37.76	37.76	37.76	37.76
October 19, 2026	37.23	37.23	37.23	37.23	37.23
October 16, 2026	37.07	37.07	37.07	37.07	37.07
October 15, 2026	37.8	37.8	37.8	37.8	37.8
October 14, 2026	37.14	37.14	37.14	37.14	37.14
October 13, 2026	37.82	37.82	37.82	37.82	37.82
October 12, 2026	38.05	38.05	38.05	38.05	38.05
October 09, 2026	38.3	38.3	38.3	38.3	38.3
October 08, 2026	37.9	37.9	37.9	37.9	37.9
October 07, 2026	38.14	38.14	38.14	38.14	38.14
October 06, 2026	38.69	38.69	38.69	38.69	38.69
October 05, 2026	38.88	38.88	38.88	38.88	38.88
October 02, 2026	38.51	38.51	38.51	38.51	38.51
October 01, 2026	37.92	37.92	37.92	37.92	37.92
September 30, 2026	37.86	37.86	37.86	37.86	37.86
September 29, 2026	37.88	37.88	37.88	37.88	37.88
September 28, 2026	37.83	37.83	37.83	37.83	37.83
September 25, 2026	38.19	38.19	38.19	38.19	38.19
September 24, 2026	38.14	38.14	38.14	38.14	38.14
September 23, 2026	38.12	38.12	38.12	38.12	38.12
September 22, 2026	38.66	38.66	38.66	38.66	38.66
September 21, 2026	38.38	38.52	38.52	38.52	38.38
September 18, 2026	38.38	38.38	38.38	38.38	38.38
September 17, 2026	38.46	38.46	38.46	38.46	38.46
September 16, 2026	38.25	38.25	38.25	38.25	38.25
September 15, 2026	38.31	38.31	38.31	38.31	38.31
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