*
|
The
remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter the disclosures provided in a prior cover
page.
|
1.
|
NAME
OF REPORTING PERSONS
|
|
I.R.S.
IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
|
||
William
Blair & Company, L.L.C.
|
||
36-2214610
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||
2.
|
CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
|
|
(a) o
|
||
(b) o
|
||
3.
|
SEC
USE ONLY
|
|
4.
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
|
|
222 W Adams | ||
Chicago,
IL 60606
|
NUMBER
OF
|
5.
|
SOLE
VOTING POWER
|
SHARES
|
824567
|
|
BENEFICIALLY
|
6.
|
SHARED
VOTING POWER
|
OWNED
BY
|
-0-
|
|
EACH
|
7.
|
SOLE
DISPOSITIVE POWER
|
REPORTING
|
824567
|
|
PERSON
|
8.
|
SHARED
DISPOSITIVE POWER
|
WITH
|
-0-
|
9.
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
|
|
824567
|
||
10.
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
SHARES*
|
|
o
|
||
11.
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
|
|
1.62% | ||
12.
|
TYPE
OF REPORTING PERSON*
|
|
BD,
IA
|
Item
3.
|
If
This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b)
or (c), Check Whether the Person Filing is
a:
|
|
(a)
|
x
|
Broker
or dealer registered under Section 15 of the Exchange
Act.
|
|
(b)
|
o
|
Bank
as defined in Section 3(a)(6) of the Exchange
Act.
|
|
(c)
|
o
|
Insurance
company as defined in Section 3(a)(19) of the Exchange
Act.
|
|
(d)
|
o
|
Investment
company registered under Section 8 of the Investment Company
Act.
|
|
(e)
|
x
|
An
investment adviser in accordance with Rule
13d-1(b)(1)(ii)(E);
|
|
(f)
|
o
|
An
employee benefit plan or endowment fund in accordance with Rule
13d-1(b)(1)(ii)(F);
|
|
(g)
|
o
|
A
parent holding company or control person in accordance with Rule
13d-1(b)(1)(ii)(G);
|
|
(h)
|
o
|
A
savings association as defined in Section 3(b) of the Federal Deposit
Insurance Act;
|
|
(i)
|
o
|
A
church plan that is excluded from the definition of an investment company
under Section 3(c)(14) of the Investment Company
Act;
|
|
(j)
|
o
|
Group,
in accordance with Rule
13d-1(b)(1)(ii)(J).
|
|
(i)
|
Sole
power to vote or to direct the vote
|
|
(ii)
|
Shared
power to vote or to direct the vote
|
|
(iii)
|
Sole
power to dispose or to direct the disposition
of
|
|
(iv)
|
Shared
power to dispose or to direct the disposition
of
|
Item
7.
|
Identification
and Classification of the Subsidiary Which Acquired the Security Being
Reported on by the Parent Holding Company or Control
Person.
|
February 5, 2010
|
|
(Date)
|
|
/s/ Michelle Seitz
|
|
(Signature)
|
|
Principal & Manager of Investment
Services
|
|
(Name/Title)
|