CUSIP
NO. 00484M106
|
13G
|
Page
2 of 10
|
1.
|
NAMES
OF REPORTING PERSONS
I.R.S.
IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
Ridgeback
Capital Investments
L.P.
00-0000000
|
||||
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
Cayman
Islands
|
||||
NUMBER
OF
SHARES
BENEFICIALLY
OWNED
BY
EACH
REPORTING
PERSON
WITH
|
5.
|
SOLE
VOTING POWER
-0-
|
|||
6.
|
SHARED
VOTING POWER
628,836
|
||||
7.
|
SOLE
DISPOSITIVE POWER
-0-
|
||||
8.
|
SHARED
DISPOSITIVE POWER
628,836
|
||||
9.
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
628,836
|
||||
10.
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES
CERTAIN
SHARES**
|
o
|
|||
11.
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW 9
1.7%
|
||||
12.
|
TYPE
OF REPORTING PERSON**
OO
|
||||
**
SEE INSTRUCTIONS BEFORE FILLING
OUT
|
CUSIP
NO. 00484M106
|
13G
|
Page 3
of 10
|
1.
|
NAMES
OF REPORTING PERSONS
I.R.S.
IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
Ridgeback
Capital Investments
Ltd. 00-0000000
|
||||
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
Cayman
Islands
|
||||
NUMBER
OF
SHARES
BENEFICIALLY
OWNED
BY
EACH
REPORTING
PERSON
WITH
|
5.
|
SOLE
VOTING POWER
-0-
|
|||
6.
|
SHARED
VOTING POWER
628,836
|
||||
7.
|
SOLE
DISPOSITIVE POWER
-0-
|
||||
8.
|
SHARED
DISPOSITIVE POWER
628,836
|
||||
9.
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
628,836
|
||||
10.
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES
CERTAIN
SHARES**
|
o
|
|||
11.
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW 9
1.7%
|
||||
12.
|
TYPE
OF REPORTING PERSON**
OO
|
||||
**
SEE INSTRUCTIONS BEFORE FILLING
OUT
|
CUSIP
NO. 00484M106
|
13G
|
Page 4
of 10
|
1.
|
NAMES
OF REPORTING PERSONS
I.R.S.
IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
Ridgeback
Capital Management
LLC 42-1684320
|
||||
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
Delaware
|
||||
NUMBER
OF
SHARES
BENEFICIALLY
OWNED
BY
EACH
REPORTING
PERSON
WITH
|
5.
|
SOLE
VOTING POWER
-0-
|
|||
6.
|
SHARED
VOTING POWER
628,836
|
||||
7.
|
SOLE
DISPOSITIVE POWER
-0-
|
||||
8.
|
SHARED
DISPOSITIVE POWER
628,836
|
||||
9.
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
628,836
|
||||
10.
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES
CERTAIN
SHARES**
|
o
|
|||
11.
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW 9
1.7%
|
||||
12.
|
TYPE
OF REPORTING PERSON**
OO
|
||||
**
SEE INSTRUCTIONS BEFORE FILLING
OUT
|
CUSIP
NO. 00484M106
|
13G
|
Page 5
of 10
|
Item
1(a).
|
Name
of Issuer.
|
Item
1(b).
|
Address
of Issuer’s Principal Executive
Offices.
|
Items
2(a).
|
Name
of Person Filing.
|
Item
2(b).
|
Address
of Principal Business Office or, if None,
Residence.
|
Item
2(c).
|
Citizenship.
|
Item
2(d).
|
Title
of Class of Securities.
|
Item
2(e).
|
CUSIP
Number.
|
CUSIP
NO. 00484M106
|
13G
|
Page 6
of 10
|
Item
3.
|
(a)
|
o
|
Broker
or dealer registered under Section 15 of the Act,
|
|
(b)
|
o
|
Bank
as defined in Section 3(a)(6) of the Act,
|
|
(c)
|
o
|
Insurance
Company as defined in Section 3(a)(19) of the Act,
|
|
(d)
|
o
|
Investment
Company registered under Section 8 of the Investment Company Act of
1940,
|
|
(e)
|
o
|
Investment
Adviser in accordance with Rule 13d-1 (b)(1)(ii)(E),
|
|
(f)
|
o
|
Employee
Benefit Plan or Endowment Fund in accordance with 13d-1
(b)(1)(ii)(F),
|
|
(g)
|
o
|
Parent
Holding Company or control person in accordance with Rule 13d-1
(b)(1)(ii)(G),
|
|
(h)
|
o
|
Savings
Association as defined in Section 3(b) of the Federal Deposit Insurance
Act,
|
|
(i)
|
o
|
Church
Plan that is excluded from the definition of an investment company under
Section 3(c)(14) of the Investment Company Act of 1940,
|
|
(j)
|
o
|
Group,
in accordance with Rule
13d-1(b)(1)(ii)(J).
|
Item
4.
|
Ownership.
|
A.
|
Ridgeback
Capital Investments L.P.
|
|
(a)
|
Amount
beneficially owned: 628,836
|
|
(b)
|
Percent
of class: 1.7%
|
|
(c)
|
(i)
|
Sole
power to vote or direct the vote: -0-
|
(ii)
|
Shared
power to vote or direct the vote: 628,836
|
|
(iii)
|
Sole
power to dispose or direct the
disposition: -0-
|
|
(iv)
|
Shared
power to dispose or direct the disposition:
628,836
|
CUSIP
NO. 00484M106
|
13G
|
Page 7
of 10
|
B.
|
Ridgeback
Capital Investments Ltd.
|
|
(a)
|
Amount
beneficially owned: 628,836
|
|
(b)
|
Percent
of class: 1.7%
|
|
(c)
|
(i)
|
Sole
power to vote or direct the vote: -0-
|
(ii)
|
Shared
power to vote or direct the vote: 628,836
|
|
(iii)
|
Sole
power to dispose or direct the
disposition: -0-
|
|
(iv)
|
Shared
power to dispose or direct the disposition: 628,836
|
|
C.
|
Ridgeback
Capital Management LLC
|
|
(a)
|
Amount
beneficially owned: 628,836
|
|
(b)
|
Percent
of class: 1.7%
|
|
(c)
|
(i)
|
Sole
power to vote or direct the vote: -0-
|
(ii)
|
Shared
power to vote or direct the vote: 628,836
|
|
(iii)
|
Sole
power to dispose or direct the
disposition: -0-
|
|
(iv)
|
Shared
power to dispose or direct the disposition:
628,836
|
Item
5.
|
Ownership
of Five Percent or Less of a Class.
|
Item
6.
|
Ownership
of More than Five Percent on Behalf of Another
Person.
|
CUSIP
NO. 00484M106
|
13G
|
Page 8
of 10
|
Item
7.
|
Identification
and Classification of the Subsidiary Which Acquired the Security Being
Reported on by the Parent Holding
Company.
|
Item
8.
|
Identification
and Classification of Members of the
Group.
|
Item
9.
|
Notice
of Dissolution of Group.
|
Item
10.
|
Certifications.
|
CUSIP
NO. 00484M106
|
13G
|
Page 9
of 10
|
Ridgeback
Capital Investments L.P.
|
|||
By:
|
Ridgeback
Capital Investments Ltd.,
|
||
Its
General Partner
|
|||
By:
|
/s/
Bud Holman
|
||
Name: Bud
Holman
|
|||
Title: Director
|
Ridgeback
Capital Investments Ltd.
|
|||
By:
|
/s/
Bud Holman
|
||
Name:
Bud Holman
|
|||
Title:
Director
|
Ridgeback
Capital Management LLC
|
|||
By:
|
*
|
||
Name:
Wayne Holman
|
|||
Title:
Managing Member
|
*
|
By:
|
/s/ Bud Holman | |||
Bud
Holman, Attorney-in-Fact
|
|||||
Power
of attorney previously filed
|
CUSIP
NO. 00484M106
|
13G
|
Page 10
of 10
|
Exhibit
Number
|
Exhibit
Description
|
24.1
|
Power of Attorney*
|
99.1
|
Joint Filing
Agreement*
|