Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
*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 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. 923359103
13G
PAGE 1 OF 9 PAGES
1.
NAME OF REPORTING PERSONS
Oak Investment Partners X, Limited Partnership
06-1601019
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ X ]
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
307,378 Shares of Common Stock
6. SHARED VOTING POWER
0 Shares of Common Stock
7. SOLE DISPOSITIVE POWER
307,378 Shares of Common Stock
8. SHARED DISPOSITIVE POWER
0 Shares of Common Stock
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
307,378 Shares of Common Stock
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES: [ ]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.1%
12.
TYPE OF REPORTING PERSON
PN
CUSIP NO. 923359103
13G
PAGE 2 OF 9 PAGES
1.
NAME OF REPORTING PERSONS
Oak Associates X, LLC
06-1630661
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ X ]
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 Shares of Common Stock
6. SHARED VOTING POWER
307,378 Shares of Common Stock
7. SOLE DISPOSITIVE POWER
0 Shares of Common Stock
8. SHARED DISPOSITIVE POWER
307,378 Shares of Common Stock
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
307,378 Shares of Common Stock
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES: [ ]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.1%
12.
TYPE OF REPORTING PERSON
OO-LLC
CUSIP NO. 923359103
13G
PAGE 3 OF 9 PAGES
1.
NAME OF REPORTING PERSONS
Oak X Affiliates Fund, Limited Partnership
06-1622220
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ X ]
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
4,934 Shares of Common Stock
6. SHARED VOTING POWER
0 Shares of Common Stock
7. SOLE DISPOSITIVE POWER
4,934 Shares of Common Stock
8. SHARED DISPOSITIVE POWER
0 Shares of Common Stock
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
4,934 Shares of Common Stock
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES: [ ]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
Less than 0.1%
12.
TYPE OF REPORTING PERSON
PN
CUSIP NO. 923359103
13G
PAGE 4 OF 9 PAGES
1.
NAME OF REPORTING PERSONS
Oak X Affiliates, LLC
06-1630662
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ X ]
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 Shares of Common Stock
6. SHARED VOTING POWER
4,934 Shares of Common Stock
7. SOLE DISPOSITIVE POWER
0 Shares of Common Stock
8. SHARED DISPOSITIVE POWER
4,934 Shares of Common Stock
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
4,934 Shares of Common Stock
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES: [ ]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
Less than 0.1%
12.
TYPE OF REPORTING PERSON
OO-LLC
CUSIP NO. 923359103
13G
PAGE 5 OF 9 PAGES
1.
NAME OF REPORTING PERSONS
Oak Management Corporation
06-0990851
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ X ]
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 Shares of Common Stock
6. SHARED VOTING POWER
312,312 Shares of Common Stock
7. SOLE DISPOSITIVE POWER
0 Shares of Common Stock
8. SHARED DISPOSITIVE POWER
312,312 Shares of Common Stock
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
312,312 Shares of Common Stock
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES: [ ]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.2%
12.
TYPE OF REPORTING PERSON
CO
CUSIP NO. 923359103
13G
PAGE 6 OF 9 PAGES
1.
NAME OF REPORTING PERSONS
Bandel L. Carano
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ X ]
3.
SEC USE ONLY
4.
CITIZENSHIP OR PLACE OF ORGANIZATION
United States
NUMBER OF SHARES BENEFICIALLY OWNED BY
EACH REPORTING PERSON WITH:
5. SOLE VOTING POWER
0 Shares of Common Stock
6. SHARED VOTING POWER
312,312 Shares of Common Stock
7. SOLE DISPOSITIVE POWER
0 Shares of Common Stock
8. SHARED DISPOSITIVE POWER
312,312 Shares of Common Stock
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
312,312 Shares of Common Stock
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES: [ ]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.2%
12.
TYPE OF REPORTING PERSON
IN
CUSIP NO. 923359103
13G
PAGE 7 OF 9 PAGES
1.
NAME OF REPORTING PERSONS
Edward F. Glassmeyer
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ X ]
3.
SEC USE ONLY
4.
CITIZENSHIP OR PLACE OF ORGANIZATION
United States
NUMBER OF SHARES BENEFICIALLY OWNED BY
EACH REPORTING PERSON WITH:
5. SOLE VOTING POWER
0 Shares of Common Stock
6. SHARED VOTING POWER
312,312 Shares of Common Stock
7. SOLE DISPOSITIVE POWER
0 Shares of Common Stock
8. SHARED DISPOSITIVE POWER
312,312 Shares of Common Stock
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
312,312 Shares of Common Stock
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES: [ ]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.2%
12.
TYPE OF REPORTING PERSON
IN
CUSIP NO. 923359103
13G
PAGE 8 OF 9 PAGES
1.
NAME OF REPORTING PERSONS
Fredric W. Harman
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ X ]
3.
SEC USE ONLY
4.
CITIZENSHIP OR PLACE OF ORGANIZATION
United States
NUMBER OF SHARES BENEFICIALLY OWNED BY
EACH REPORTING PERSON WITH:
5. SOLE VOTING POWER
0 Shares of Common Stock
6. SHARED VOTING POWER
312,312 Shares of Common Stock
7. SOLE DISPOSITIVE POWER
0 Shares of Common Stock
8. SHARED DISPOSITIVE POWER
312,312 Shares of Common Stock
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
312,312 Shares of Common Stock
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES: [ ]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.2%
12.
TYPE OF REPORTING PERSON
IN
CUSIP NO. 923359103
13G
PAGE 9 OF 9 PAGES
1.
NAME OF REPORTING PERSONS
Ann H. Lamont
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [ X ]
3.
SEC USE ONLY
4.
CITIZENSHIP OR PLACE OF ORGANIZATION
United States
NUMBER OF SHARES BENEFICIALLY OWNED BY
EACH REPORTING PERSON WITH:
5. SOLE VOTING POWER
0 Shares of Common Stock
6. SHARED VOTING POWER
312,312 Shares of Common Stock
7. SOLE DISPOSITIVE POWER
0 Shares of Common Stock
8. SHARED DISPOSITIVE POWER
312,312 Shares of Common Stock
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
312,312 Shares of Common Stock
10.
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES: [ ]
11.
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
2.2%
12.
TYPE OF REPORTING PERSON
IN