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Idexx Laboratories
IDXX

Name Holding Trade Value Shares
Change 		Change in
Stake
T. Rowe Price Associates
1
T. Rowe Price Associates
Maryland
$785M +$764M +17,482,500 New
RCG
2
Ruane, Cunniff & Goldfarb
New York
$480M +$468M +10,703,524 New
William Blair & Company
3
William Blair & Company
Illinois
$418M +$407M +9,309,644 New
Brown Advisory
4
Brown Advisory
Maryland
$358M +$349M +7,990,466 New
BAMCO Inc
5
BAMCO Inc
New York
$322M +$313M +7,169,996 New
Vanguard Group
6
Vanguard Group
Pennsylvania
$250M +$243M +5,563,968 New
Neuberger Berman Group
7
Neuberger Berman Group
New York
$221M +$216M +4,934,262 New
State Street
8
State Street
Massachusetts
$147M +$143M +3,284,006 New
RA
9
Royce & Associates
New York
$147M +$143M +3,269,822 New
BIT
10
BlackRock Institutional Trust
California
$133M +$130M +2,967,586 New
BFA
11
BlackRock Fund Advisors
California
$118M +$115M +2,636,324 New
JP Morgan Chase
12
JP Morgan Chase
New York
$73.4M +$71.5M +1,636,648 New
JHIU
13
Janus Henderson Investors US
Colorado
$69.2M +$67.4M +1,541,958 New
CC
14
Capital Counsel
New York
$67.2M +$65.5M +1,498,388 New
Westfield Capital Management
15
Westfield Capital Management
Massachusetts
$64.6M +$63M +1,441,620 New
American Century Companies
16
American Century Companies
Missouri
$62.7M +$61M +1,396,058 New
ACM
17
Atlanta Capital Management
Georgia
$61.7M +$60.1M +1,375,028 New
Bank of New York Mellon
18
Bank of New York Mellon
New York
$54.2M +$52.8M +1,208,480 New
SGA
19
Sustainable Growth Advisers
Connecticut
$45.5M +$44.4M +1,015,416 New
Northern Trust
20
Northern Trust
Illinois
$39.5M +$38.5M +879,962 New
RFC
21
Russell Frank Company
Washington
$37.2M +$36.2M +828,870 New
TCIM
22
TIAA CREF Investment Management
New York
$32.9M +$32.1M +733,716 New
AIM
23
Aster Investment Management
California
$32.3M +$31.5M +720,000 New
Renaissance Technologies
24
Renaissance Technologies
New York
$30.7M +$29.9M +684,904 New
Ameriprise
25
Ameriprise
Minnesota
$30.4M +$29.6M +676,526 New
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