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Filing Details

Accession Number:: 0001193125-17-030958
Form Type:: 13G Filing
Publication Date:: 2017-02-03 18:49:56

Filed By:: Columbia Capital Equity Partners Iv Qp L P
Company:: Zayo Group Holdings Inc. (NYSE:ZAYO)
Filing Date:: 2017-02-06
SEC Url:: 13G Filing

Ownership Summary

Please notice the below summary table is generated without human intervention and may contain errors. Please refer to the complete filing displayed below for exact figures.

Name	Sole Voting Power	Shared Voting Power	Sole Dispositive Power	Shared Dispositive Power	Aggregate Amount Owned Power	Percent of Class
Columbia Capital Equity Partners IV (QP)	0	0	0	0	0	0.0%
Columbia Capital Equity Partners IV (QPCO)	0	0	0	0	0	0.0%
Columbia Capital Employee Investors IV	0	0	0	0	0	0.0%
Columbia Capital Equity Partners III (QP)	0	0	0	0	0	0.0%
Columbia Capital Equity Partners III (Cayman)	0	0	0	0	0	0.0%
Columbia Capital Equity Partners III (AI)	0	0	0	0	0	0.0%
Columbia Capital Investors III	0	0	0	0	0	0.0%
Columbia Capital Employee Investors III	0	0	0	0	0	0.0%
Columbia Capital Equity Partners IV	0	0	0	0	0	0.0%
Columbia Capital IV	0	0	0	0	0	0.0%
Columbia Capital Equity Partners (Cayman) III, Ltd	0	0	0	0	0	0.0%
Columbia Capital Equity Partners III	0	0	0	0	0	0.0%
Columbia Capital III	0	0	0	0	0	0.0%
James B. Fleming, Jr	0	0	0	0	0	0.0%

Filing

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 2)*

ZAYO GROUP HOLDINGS, INC.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

98919V105

(CUSIP Number)

December 31, 2016

(Date of Event which Requires filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☐ Rule 13d-1(c)

☒ Rule 13d-1(d)

*	The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).


CUSIP No. 98919V105		Schedule 13G		Page 1 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Equity Partners IV (QP), L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON PN


CUSIP No. 98919V105		Schedule 13G		Page 2 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Equity PartnersIV (QPCO), L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON PN


CUSIP No. 98919V105		Schedule 13G		Page 3 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Employee Investors IV, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON PN


CUSIP No. 98919V105		Schedule 13G		Page 4 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Equity Partners III (QP), L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON PN


CUSIP No. 98919V105		Schedule 13G		Page 5 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Equity Partners III (Cayman), L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN 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 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON PN


CUSIP No. 98919V105		Schedule 13G		Page 6 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Equity Partners III (AI), L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON PN


CUSIP No. 98919V105		Schedule 13G		Page 7 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Investors III, LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON OO


CUSIP No. 98919V105		Schedule 13G		Page 8 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Employee Investors III, LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON OO


CUSIP No. 98919V105		Schedule 13G		Page 9 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Equity Partners IV, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON PN


CUSIP No. 98919V105		Schedule 13G		Page 10 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital IV, LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON OO


CUSIP No. 98919V105		Schedule 13G		Page 11 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Equity Partners (Cayman) III, Ltd.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN 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 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON CO


CUSIP No. 98919V105		Schedule 13G		Page 12 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital Equity Partners III, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON PN


CUSIP No. 98919V105		Schedule 13G		Page 13 of 22


1	NAMES OF REPORTING PERSONS Columbia Capital III, LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON OO


CUSIP No. 98919V105		Schedule 13G		Page 14 of 22


1	NAMES OF REPORTING PERSONS James B. Fleming, Jr.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
3	SEC USE ONLY
4	CITIZEN OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 0
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES Not Applicable
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.0%
12	TYPE OF REPORTING PERSON IN


CUSIP No. 98919V105		Schedule 13G		Page 15 of 22


ITEM 1. (a)				Name of Issuer:

				Zayo Group Holdings, Inc. (the Issuer).

(b)				Address of Issuers Principal Executive Offices:

				1805 29th Street, Suite 2050 Boulder, CO 80301

ITEM 2. (a)				Name of Person Filing:

				Each of the following is hereinafter individually referred to as a Reporting Person and collectively as the Reporting Persons. This statement is filed on behalf of:

				Columbia Capital Equity Partners IV (QP), L.P. Columbia Capital Equity Partners IV (QPCO), L.P. Columbia Capital Employee Investors IV, L.P. Columbia Capital Equity Partners III (QP), L.P. Columbia Capital Equity Partners III (Cayman), L.P. Columbia Capital Equity Partners III (AI), L.P. Columbia Capital Investors III, LLC Columbia Capital Employee Investors III, LLC Columbia Capital Equity Partners IV, L.P. Columbia Capital IV, LLC Columbia Capital Equity Partners (Cayman) III, Ltd. Columbia Capital Equity Partners III, L.P. Columbia Capital III, LLC James B. Fleming, Jr.

(b)				Address of Principal Business Office:

				The business address of each of the Reporting Persons is 204 S. Union Street, Alexandria, VA 22314.


CUSIP No. 98919V105		Schedule 13G		Page 16 of 22


(c)				Citizenship:


Columbia Capital Equity Partners IV (QP), L.P.			Delaware
Columbia Capital Equity Partners IV (QPCO), L.P.			Delaware
Columbia Capital Employee Investors IV, L.P.			Delaware
Columbia Capital Equity Partners III (QP), L.P.			Delaware
Columbia Capital Equity Partners III (Cayman), L.P.			Cayman Islands
Columbia Capital Equity Partners III (AI), L.P.			Delaware
Columbia Capital Investors III, LLC			Delaware
Columbia Capital Employee Investors III, LLC			Delaware
Columbia Capital Equity Partners IV, L.P.			Delaware
Columbia Capital IV, LLC			Delaware
Columbia Capital Equity Partners (Cayman) III, Ltd.			Cayman Islands
Columbia Capital Equity Partners III, L.P.			Delaware
Columbia Capital III, LLC			Delaware
James B. Fleming, Jr.			United States



(d)				Title of Class of Securities:

				Common stock, $0.001 par value per share (Common Stock).

(e)				CUSIP Number:

				98919V105

ITEM 3.

				Not applicable.


CUSIP No. 98919V105		Schedule 13G		Page 17 of 22


ITEM 4.				Ownership.

Ownership (a-c)

The ownership information presented below represents beneficial ownership of Common Stock of the Issuer as of December 31, 2016.


Reporting Person	Amount beneficially owned		Percent of class			Sole power to vote or to direct the vote		Shared power to vote or to direct the vote		Sole power to dispose or to direct the disposition of		Shared power to dispose or to direct the disposition of
Columbia Capital Equity Partners IV (QP), L.P.		0		0.0	%		0		0		0		0
Columbia Capital Equity Partners IV (QPCO), L.P.		0		0.0	%		0		0		0		0
Columbia Capital Employee Investors IV, L.P.		0		0.0	%		0		0		0		0
Columbia Capital Equity Partners III (QP), L.P.		0		0.0	%		0		0		0		0
Columbia Capital Equity Partners III (Cayman), L.P.		0		0.0	%		0		0		0		0
Columbia Capital Equity Partners III (AI), L.P.		0		0.0	%		0		0		0		0
Columbia Capital Investors III, LLC		0		0.0	%		0		0		0		0
Columbia Capital Employee Investors III, LLC		0		0.0	%		0		0		0		0
Columbia Capital Equity Partners IV, L.P.		0		0.0	%		0		0		0		0
Columbia Capital IV, LLC		0		0.0	%		0		0		0		0
Columbia Capital Equity Partners (Cayman) III, Ltd.		0		0.0	%		0		0		0		0
Columbia Capital Equity Partners III, L.P.		0		0.0	%		0		0		0		0
Columbia Capital III, LLC		0		0.0	%		0		0		0		0
James B. Fleming, Jr.		0		0.0	%		0		0		0		0


CUSIP No. 98919V105		Schedule 13G		Page 18 of 22


ITEM 5.				Ownership of Five Percent or Less of a Class.

				If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following ☑.

ITEM 6.				Ownership of More Than Five Percent on Behalf of Another Person.

				Not applicable.

ITEM 7.				Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.

				Not applicable.

ITEM 8.				Identification and Classification of Members of the Group.

				Not applicable.

ITEM 9.				Notice of Dissolution of Group.

				Not applicable.

ITEM 10.				Certifications.

				Not applicable.


CUSIP No. 98919V105		Schedule 13G		Page 19 of 22

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: February 3, 2017


COLUMBIA CAPITAL EQUITY PARTNERS IV (QP), L.P.
By:		Columbia Capital Equity Partners IV, L.P., its general partner
By:		Columbia Capital IV, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL EQUITY PARTNERS IV (QPCO), L.P.
By:		Columbia Capital Equity Partners IV, L.P., its general partner
By:		Columbia Capital IV, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL EMPLOYEE INVESTORS IV, L.P.
By:		Columbia Capital IV, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL EQUITY PARTNERS III (QP), L.P.
By:		Columbia Capital Equity Partners III, L.P., its general partner
By:		Columbia Capital III, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President


CUSIP No. 98919V105		Schedule 13G		Page 20 of 22


COLUMBIA CAPITAL EQUITY PARTNERS III (CAYMAN), L.P.
By: Columbia Capital Equity Partners (Cayman) III, Ltd., its general partner
By: Columbia Capital Equity Partners III, L.P., its sole shareholder
By: Columbia Capital III, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL EQUITY PARTNERS III (AI), L.P.
By:		Columbia Capital Equity Partners III, L.P., its general partner
By:		Columbia Capital III, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL INVESTORS III, LLC
By: Columbia Capital Equity Partners III, L.P., its managing member
By:		Columbia Capital III, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL EMPLOYEE INVESTORS III, LLC
By: Columbia Capital Equity Partners III, L.P., its managing member
By:		Columbia Capital III, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL EQUITY PARTNERS IV, L.P.
By:		Columbia Capital IV, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President


CUSIP No. 98919V105		Schedule 13G		Page 21 of 22


COLUMBIA CAPITAL IV, LLC

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL EQUITY PARTNERS (CAYMAN) III, LTD.
By: Columbia Capital Equity Partners III, L.P., its sole shareholder
By:		Columbia Capital III, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL EQUITY PARTNERS III, L.P.
By:		Columbia Capital III, LLC, its general partner

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

COLUMBIA CAPITAL III, LLC

By:		/s/ Donald A. Doering
Name:		Donald A. Doering
Title:		Executive Vice President

JAMES B. FLEMING, JR.

By:		/s/ James B. Fleming, Jr.


CUSIP No. 98919V105		Schedule 13G		Page 22 of 22

LIST OF EXHIBITS


Exhibit No.		Description

99		Joint Filing Agreement (incorporated by reference to Exhibit 99 to the Schedule 13G filed by the Reporting Persons on February 12, 2015)