OMB
APPROVAL
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||
UNITED
STATES
SECURITIES
AND EXCHANGE
COMMISSION
Washington,
D.C. 20549
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OMB
Number:
3235-0145
Expires:
February 28, 2009
Estimated
average burden hours per
response.........................................10.4
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Cogent
Communications Group, Inc.
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Common
Stock, Par Value $.001 Per
Share
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19239V302
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December
31, 2007
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CUSIP
No.
19239V302
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13G
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Page
2 of 10
Pages
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1
|
NAMES
OF REPORTING PERSONS
I.R.S.
IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Ziff
Asset Management,
L.P.
|
2
|
CHECK
THE APPROPRIATE BOX IF A
MEMBER OF A GROUP (SEE
INSTRUCTIONS)
(a)
o
(b) o
|
3
|
SEC
USE ONLY
|
4
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
Delaware
|
NUMBER
OF
SHARES
|
5
|
SOLE
VOTING POWER
0
|
BENEFICIALLY
OWNED
BY
|
6
|
SHARED
VOTING POWER
859,923
|
EACH
REPORTING
|
7
|
SOLE
DISPOSITIVE POWER
0
|
PERSON
WITH
|
8
|
SHARED
DISPOSITIVE POWER
859,923
|
9
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
859,923
|
10
|
CHECK
IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
INSTRUCTIONS)
o
|
11
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
1.8%
|
12
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TYPE
OF REPORTING PERSON (SEE INSTRUCTIONS)
PN
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CUSIP
No.
19239V302
|
13G
|
Page 3
of 10
Pages
|
1
|
NAMES
OF REPORTING PERSONS
I.R.S.
IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
PBK
Holdings, Inc.
|
2
|
CHECK
THE APPROPRIATE BOX IF A
MEMBER OF A GROUP (SEE
INSTRUCTIONS)
(a)
o
(b) o
|
3
|
SEC
USE ONLY
|
4
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
Delaware
|
NUMBER
OF
SHARES
|
5
|
SOLE
VOTING POWER
0
|
BENEFICIALLY
OWNED
BY
|
6
|
SHARED
VOTING POWER
955,476
|
EACH
REPORTING
|
7
|
SOLE
DISPOSITIVE POWER
0
|
PERSON
WITH
|
8
|
SHARED
DISPOSITIVE POWER
955,476
|
9
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
955,476
|
10
|
CHECK
IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
INSTRUCTIONS) o
|
11
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.0%
|
12
|
TYPE
OF REPORTING PERSON (SEE INSTRUCTIONS)
CO
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CUSIP
No.
19239V302
|
13G
|
Page 4
of 10
Pages
|
1
|
NAMES
OF REPORTING PERSONS
I.R.S.
IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Philip
B. Korsant
|
2
|
CHECK
THE APPROPRIATE BOX IF A
MEMBER OF A GROUP (SEE
INSTRUCTIONS)
(a)
o
(b) o
|
3
|
SEC
USE ONLY
|
4
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
United
States of
America
|
NUMBER
OF
SHARES
|
5
|
SOLE
VOTING POWER
0
|
BENEFICIALLY
OWNED
BY
|
6
|
SHARED
VOTING POWER
955,476
|
EACH
REPORTING
|
7
|
SOLE
DISPOSITIVE POWER
0
|
PERSON
WITH
|
8
|
SHARED
DISPOSITIVE POWER
955,476
|
9
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
955,476
|
10
|
CHECK
IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
INSTRUCTIONS)
o
|
11
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.0%
|
12
|
TYPE
OF REPORTING PERSON (SEE INSTRUCTIONS)
IN
|
CUSIP
No.
19239V302
|
13G
|
Page 5
of 10
Pages
|
1
|
NAMES
OF REPORTING PERSONS
I.R.S.
IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
ZBI
Equities, L.L.C.
|
2
|
CHECK
THE APPROPRIATE BOX IF A
MEMBER OF A GROUP (SEE INSTRUCTIONS)
(a)
o
(b) o
|
3
|
SEC
USE ONLY
|
4
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
Delaware
|
NUMBER
OF
SHARES
|
5
|
SOLE
VOTING POWER
0
|
BENEFICIALLY
OWNED
BY
|
6
|
SHARED
VOTING POWER
955,476
|
EACH
REPORTING
|
7
|
SOLE
DISPOSITIVE POWER
0
|
PERSON
WITH
|
8
|
SHARED
DISPOSITIVE POWER
955,476
|
9
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
955,476
|
10
|
CHECK
IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
INSTRUCTIONS)
o
|
11
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.0%
|
12
|
TYPE
OF REPORTING PERSON (SEE INSTRUCTIONS)
IA
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(a)
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Amount
beneficially owned:
|
|
See
Item 9 of the attached cover pages.
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(b)
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Percent
of class:
|
|
See
Item 11 of the attached cover pages.
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(c)
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Number
of shares as to which such person
has:
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(i)
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Sole
power to vote or to direct the vote:
|
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See
Item 5 of the attached cover pages.
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(ii)
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Shared
power to vote or to direct the vote:
|
|
See
Item 6 of the attached cover pages.
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(iii)
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Sole
power to dispose or to direct the disposition:
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See
Item 7 of the attached cover pages.
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(iv)
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Shared
power to dispose or to direct the disposition:
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See
Item 8 of the attached cover pages.
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Item
7.
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Identification
and
Classification of the Subsidiary Which Acquired the Security Being
Reported on by the Parent Holding
Company
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ZIFF
ASSET MANAGEMENT, L.P.
By: PBK
Holdings, Inc., its general partner
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By:
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/s/
DAVID GRAY
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Name:
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David
Gray
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Title:
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Vice
President
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PBK
HOLDINGS, INC.
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By:
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/s/
DAVID GRAY
|
||
Name:
|
David
Gray
|
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Title:
|
Vice
President
|
||
/s/
PHILIP B.
KORSANT
|
|||
Philip
B. Korsant
|
ZBI
EQUITIES, L.L.C.
By: PBK
Holdings, Inc., its sole member
|
|||
By:
|
/s/
DAVID GRAY
|
||
Name:
|
David
Gray
|
||
Title:
|
Vice
President
|
ZIFF
ASSET MANAGEMENT, L.P.
By: PBK
Holdings, Inc., its general partner
|
|||
By:
|
/s/
DAVID GRAY
|
||
Name:
|
David
Gray
|
||
Title:
|
Vice
President
|
PBK
HOLDINGS, INC.
|
|||
By:
|
/s/
DAVID GRAY
|
||
Name:
|
David
Gray
|
||
Title:
|
Vice
President
|
||
/s/
PHILIP B.
KORSANT
|
|||
Philip
B. Korsant
|
ZBI
EQUITIES, L.L.C.
By: PBK
Holdings, Inc., its sole member
|
|||
By:
|
/s/
DAVID GRAY
|
||
Name:
|
David
Gray
|
||
Title:
|
Vice
President
|