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Spok Holdings

Name Holding Trade Value Shares
Change
Change in
Stake
Marshall Wace
26
Marshall Wace
United Kingdom
$689K -$879K -89,549 -55%
Citadel Advisors
27
Citadel Advisors
Florida
$661K -$164K -16,710 -19%
Northern Trust
28
Northern Trust
Illinois
$654K +$23.6K +2,406 +4%
Connor, Clark & Lunn Investment Management (CC&L)
29
Connor, Clark & Lunn Investment Management (CC&L)
British Columbia, Canada
$604K -$91.3K -9,298 -13%
State Street
30
State Street
Massachusetts
$515K +$35.9K +3,660 +7%
CC
31
Centiva Capital
New York
$467K
William Blair & Company
32
William Blair & Company
Illinois
$451K -$718K -73,157 -60%
Verition Fund Management
33
Verition Fund Management
Connecticut
$430K +$452K +46,057 New
D.E. Shaw & Co
34
D.E. Shaw & Co
New York
$419K -$200K -20,333 -31%
CC
35
Corton Capital
Ontario, Canada
$390K +$410K +41,784 New
PCM
36
Prelude Capital Management
New York
$375K -$19.3K -1,969 -2%
RA
37
Royce & Associates
New York
$371K -$43.2K -4,404 -10%
Bank of America
38
Bank of America
North Carolina
$312K -$1.69K -172 -0.5%
Barclays
39
Barclays
United Kingdom
$299K -$29.2K -2,974 -9%
EGM
40
Engineers Gate Manager
New York
$291K -$100K -10,227 -25%
Invesco
41
Invesco
Georgia
$289K -$18.2K -1,851 -6%
MS
42
Maven Securities
Jersey
$257K +$270K +27,530 New
Nuveen
43
Nuveen
North Carolina
$242K -$127K -12,981 -33%
VAM
44
Vazirani Asset Management
New York
$221K +$232K +23,670 New
Royal Bank of Canada
45
Royal Bank of Canada
Ontario, Canada
$211K
Group One Trading
46
Group One Trading
Illinois
$211K +$203K +20,720 +1,091%
PGCM
47
Prescott Group Capital Management
Oklahoma
$202K -$914K -93,099 -81%
RC
48
RBF Capital
California
$187K
Walleye Capital
49
Walleye Capital
New York
$185K -$501K -51,033 -72%
DU
50
Delphia (USA)
Ontario, Canada
$151K +$159K +16,195 New