William Blair Investment Management, Llc

Q2 2017 13F Combination Report, Stock Holdings

Signature - Title
Michelle R. Seitz - Partner
Location
Chicago
Holdings as of
June 30, 2017
Value $
$27.4B
Num holdings
447
Date filed
8/4/2017, 12:13 PM
Form type
13F-HR
Description
A portion of the US holdings for this investor are reported in this report and a portion are reported by other reporting manager(s). Top holdings included BABA, TSM, SPY, CSGP, and CNI.
Previous filing
Q1 2017 - May 10, 2017
Sym Weight Trade Impact Company Class Shares Change Activity Value Change $ Value $ * Price $ Shares Principal
Filing 2017 Q2 compared to 2017 Q1 by default.
* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.

Person Signing this Report on Behalf of Reporting Manager:

Name Title City, State Date
Michelle R. Seitz Partner Chicago, Illinois 8/4/2017

List of Other Managers Reporting for William Blair Investment Management, Llc:

Name Holdings Value Location File Number
Russell Investments Group, Ltd. $78.4B London, United Kingdom 028-17598

Other Included Managers (1):

Num Name Location File Number
1 Russell Investments Group, Ltd. London, United Kingdom 028-17598