*
|
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 disclosures provided in a prior cover page.
|
CUSIP No. 98933Q108
|
Page 2 of 10
|
1
|
NAMES OF REPORTING PERSONS:
VENROCK ASSOCIATES V, L.P.
|
||
2
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
(a) x1 (b) ¨
|
||
3
|
SEC USE ONLY:
|
||
4
|
SOURCE OF FUNDS (SEE INSTRUCTIONS):
OO
|
||
5
|
CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
¨
|
||
6
|
CITIZENSHIP OR PLACE OF ORGANIZATION:
Delaware
|
||
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
7
|
SOLE VOTING POWER:
0
|
|
8
|
SHARED VOTING POWER:
1,771,8252
|
||
9
|
SOLE DISPOSITIVE POWER:
0
|
||
10
|
SHARED DISPOSITIVE POWER:
1,771,8252
|
||
11
|
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
1,771,8252
|
||
12
|
CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
¨
|
||
13
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
4.5%3
|
||
14
|
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
PN
|
1
|
Venrock Associates V, L.P., Venrock Entrepreneurs Fund V, L.P. and Venrock Partners V, L.P. (the “Venrock Entities”) and the general partner of each Venrock Entity, respectively, Venrock Management V, LLC, VEF Management V, LLC and Venrock Partners Management V, LLC (the “Venrock GPs”), are members of a group for purposes of this Schedule 13D/A.
|
2
|
As described in Item 5 below, the Venrock Entities and the Venrock GPs beneficially own 1,771,825 shares of Common Stock of the Issuer and each has shared voting and dispositive power over such shares.
|
3
|
This percentage is calculated based upon 39,025,926 shares of the Issuer’s Common Stock outstanding on October 22, 2015, as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on October 28, 2015.
|
CUSIP No. 98933Q108
|
Page 3 of 10
|
1
|
NAMES OF REPORTING PERSONS:
VENROCK ENTREPRENEURS FUND V, L.P.
|
||
2
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
(a) x1 (b) ¨
|
||
3
|
SEC USE ONLY:
|
||
4
|
SOURCE OF FUNDS (SEE INSTRUCTIONS):
OO
|
||
5
|
CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
¨
|
||
6
|
CITIZENSHIP OR PLACE OF ORGANIZATION:
Delaware
|
||
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH
|
7
|
SOLE VOTING POWER:
0
|
|
8
|
SHARED VOTING POWER:
1,771,8252
|
||
9
|
SOLE DISPOSITIVE POWER:
0
|
||
10
|
SHARED DISPOSITIVE POWER:
1,771,8252
|
||
11
|
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
1,771,8252
|
||
12
|
CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
¨
|
||
13
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
4.5%3
|
||
14
|
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
PN
|
1
|
Venrock Associates V, L.P., Venrock Entrepreneurs Fund V, L.P. and Venrock Partners V, L.P. (the “Venrock Entities”) and the general partner of each Venrock Entity, respectively, Venrock Management V, LLC, VEF Management V, LLC and Venrock Partners Management V, LLC (the “Venrock GPs”), are members of a group for purposes of this Schedule 13D/A.
|
2
|
As described in Item 5 below, the Venrock Entities and the Venrock GPs beneficially own 1,771,825 shares of Common Stock of the Issuer and each has shared voting and dispositive power over such shares.
|
3
|
This percentage is calculated based upon 39,025,926 shares of the Issuer’s Common Stock outstanding on October 22, 2015, as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on October 28, 2015.
|
CUSIP No. 98933Q108
|
Page 4 of 10
|
1
|
NAMES OF REPORTING PERSONS:
VENROCK PARTNERS V, L.P.
|
||
2
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
(a) x1 (b) ¨
|
||
3
|
SEC USE ONLY:
|
||
4
|
SOURCE OF FUNDS (SEE INSTRUCTIONS):
OO
|
||
5
|
CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
¨
|
||
6
|
CITIZENSHIP OR PLACE OF ORGANIZATION:
Delaware
|
||
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH
|
7
|
SOLE VOTING POWER:
0
|
|
8
|
SHARED VOTING POWER:
1,771,8252
|
||
9
|
SOLE DISPOSITIVE POWER:
0
|
||
10
|
SHARED DISPOSITIVE POWER:
1,771,8252
|
||
11
|
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
1,771,8252
|
||
12
|
CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
¨
|
||
13
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
4.5%3
|
||
14
|
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
PN
|
1
|
Venrock Associates V, L.P., Venrock Entrepreneurs Fund V, L.P. and Venrock Partners V, L.P. (the “Venrock Entities”) and the general partner of each Venrock Entity, respectively, Venrock Management V, LLC, VEF Management V, LLC and Venrock Partners Management V, LLC (the “Venrock GPs”), are members of a group for purposes of this Schedule 13D/A.
|
2
|
As described in Item 5 below, the Venrock Entities and the Venrock GPs beneficially own 1,771,825 shares of Common Stock of the Issuer and each has shared voting and dispositive power over such shares.
|
3
|
This percentage is calculated based upon 39,025,926 shares of the Issuer’s Common Stock outstanding on October 22, 2015, as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on October 28, 2015.
|
CUSIP No. 98933Q108
|
Page 5 of 10
|
1
|
NAMES OF REPORTING PERSONS:
VENROCK MANAGEMENT V, LLC
|
||
2
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
(a) x1 (b) ¨
|
||
3
|
SEC USE ONLY:
|
||
4
|
SOURCE OF FUNDS (SEE INSTRUCTIONS):
OO
|
||
5
|
CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
¨
|
||
6
|
CITIZENSHIP OR PLACE OF ORGANIZATION:
Delaware
|
||
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH
|
7
|
SOLE VOTING POWER:
0
|
|
8
|
SHARED VOTING POWER:
1,771,8252
|
||
9
|
SOLE DISPOSITIVE POWER:
0
|
||
10
|
SHARED DISPOSITIVE POWER:
1,771,8252
|
||
11
|
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
1,771,8252
|
||
12
|
CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
¨
|
||
13
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
4.5%3
|
||
14
|
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
OO
|
1
|
Venrock Associates V, L.P., Venrock Entrepreneurs Fund V, L.P. and Venrock Partners V, L.P. (the “Venrock Entities”) and the general partner of each Venrock Entity, respectively, Venrock Management V, LLC, VEF Management V, LLC and Venrock Partners Management V, LLC (the “Venrock GPs”), are members of a group for purposes of this Schedule 13D/A.
|
2
|
As described in Item 5 below, the Venrock Entities and the Venrock GPs beneficially own 1,771,825 shares of Common Stock of the Issuer and each has shared voting and dispositive power over such shares.
|
3
|
This percentage is calculated based upon 39,025,926 shares of the Issuer’s Common Stock outstanding on October 22, 2015, as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on October 28, 2015.
|
CUSIP No. 98933Q108
|
Page 6 of 10
|
1
|
NAMES OF REPORTING PERSONS:
VEF MANAGEMENT V, LLC
|
||
2
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
(a) x1 (b) ¨
|
||
3
|
SEC USE ONLY:
|
||
4
|
SOURCE OF FUNDS (SEE INSTRUCTIONS):
OO
|
||
5
|
CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
¨
|
||
6
|
CITIZENSHIP OR PLACE OF ORGANIZATION:
Delaware
|
||
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
7
|
SOLE VOTING POWER:
0
|
|
8
|
SHARED VOTING POWER:
1,771,8252
|
||
9
|
SOLE DISPOSITIVE POWER:
0
|
||
10
|
SHARED DISPOSITIVE POWER:
1,771,8252
|
||
11
|
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
1,771,8252
|
||
12
|
CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
¨
|
||
13
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
4.5%3
|
||
14
|
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
OO
|
1
|
Venrock Associates V, L.P., Venrock Entrepreneurs Fund V, L.P. and Venrock Partners V, L.P. (the “Venrock Entities”) and the general partner of each Venrock Entity, respectively, Venrock Management V, LLC, VEF Management V, LLC and Venrock Partners Management V, LLC (the “Venrock GPs”), are members of a group for purposes of this Schedule 13D/A.
|
2
|
As described in Item 5 below, the Venrock Entities and the Venrock GPs beneficially own 1,771,825 shares of Common Stock of the Issuer and each has shared voting and dispositive power over such shares.
|
3
|
This percentage is calculated based upon 39,025,926 shares of the Issuer’s Common Stock outstanding on October 22, 2015, as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on October 28, 2015.
|
CUSIP No. 98933Q108
|
Page 7 of 10
|
1
|
NAMES OF REPORTING PERSONS:
VENROCK PARTNERS MANAGEMENT V, LLC
|
||
2
|
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
(a) x1 (b) ¨
|
||
3
|
SEC USE ONLY:
|
||
4
|
SOURCE OF FUNDS (SEE INSTRUCTIONS):
OO
|
||
5
|
CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e):
¨
|
||
6
|
CITIZENSHIP OR PLACE OF ORGANIZATION:
Delaware
|
||
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH
|
7
|
SOLE VOTING POWER:
0
|
|
8
|
SHARED VOTING POWER:
1,771,8252
|
||
9
|
SOLE DISPOSITIVE POWER:
0
|
||
10
|
SHARED DISPOSITIVE POWER:
1,771,8252
|
||
11
|
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
1,771,8252
|
||
12
|
CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
¨
|
||
13
|
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
4.5%3
|
||
14
|
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
OO
|
1
|
Venrock Associates V, L.P., Venrock Entrepreneurs Fund V, L.P. and Venrock Partners V, L.P. (the “Venrock Entities”) and the general partner of each Venrock Entity, respectively, Venrock Management V, LLC, VEF Management V, LLC and Venrock Partners Management V, LLC (the “Venrock GPs”), are members of a group for purposes of this Schedule 13D/A.
|
2
|
As described in Item 5 below, the Venrock Entities and the Venrock GPs beneficially own 1,771,825 shares of Common Stock of the Issuer and each has shared voting and dispositive power over such shares.
|
3
|
This percentage is calculated based upon 39,025,926 shares of the Issuer’s Common Stock outstanding on October 22, 2015, as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on October 28, 2015.
|
CUSIP No. 98933Q108
|
Page 8 of 10
|
CUSIP No. 98933Q108
|
Page 9 of 10
|
Venrock Entity
|
|
Number of Shares Distributed to Partners
|
|
|
VA5
|
|
1,560,163
|
|
|
VEF5
|
|
36,642
|
|
|
VP5
|
|
132,312
|
|
Venrock GP
|
|
Number of Shares Received in Distribution
|
||
Venrock Management V, LLC
|
|
38,614
|
|
|
VEF Management V, LLC
|
|
815
|
|
|
Venrock Partners Management V, LLC
|
|
3,280
|
|
CUSIP No. 98933Q108
|
Page 10 of 10
|
VENROCK PARTNERS V, L.P.
By: Venrock Partners Management V, LLC
Its: General Partner
|
||
By:
|
|
/s/ David L. Stepp
|
Name:
|
|
David L. Stepp
|
Title:
|
|
Authorized Signatory
|
VENROCK ASSOCIATES V, L.P.
By: Venrock Management V, LLC
Its: General Partner
|
||
By:
|
|
/s/ David L. Stepp
|
Name:
|
|
David L. Stepp
|
Title:
|
|
Authorized Signatory
|
VENROCK ENTREPRENEURS FUND V, L.P.
By: VEF Management V, LLC
Its: General Partner
|
||
By:
|
|
/s/ David L. Stepp
|
Name:
|
|
David L. Stepp
|
Title:
|
|
Authorized Signatory
|
VENROCK PARTNERS MANAGEMENT V, LCC
|
||
By:
|
|
/s/ David L. Stepp
|
Name:
|
|
David L. Stepp
|
Title:
|
|
Authorized Signatory
|
VENROCK MANAGEMENT V, LCC
|
||
By:
|
|
/s/ David L. Stepp
|
Name:
|
|
David L. Stepp
|
Title:
|
|
Authorized Signatory
|
VEF MANAGEMENT V, LLC
|
||
By:
|
|
/s/ David L. Stepp
|
Name:
|
|
David L. Stepp
|
Title:
|
|
Authorized Signatory
|