UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 13F

                               FORM 13F Cover Page

              Report for the Calendar Year or Quarter End: 06/30/08

Matrix VI Management Co., L.L.C.
Name of Institutional Investment Manager

1000 Winter Street, Suite 4500              Waltham     MA      02451
Business Address                 (Street)    (City)   (State)   (Zip)

13F File Number:

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information herein is true, correct and complete, and
that it is understood that all required items, statements, schedules, and
tables, are considered integral parts of this form.

Name, Title and Telephone Number of Person Submitting Report:

Timothy A. Barrows                 Authorized Member           781-890-2244
(Name)                             (Title)                     (Phone)

Signature, Place and Date of Signing:


/s/ Timothy A. Barrows 8/13/2008
- --------------------------------

Report Type:

[X]  13F HOLDINGS REPORT.

[ ]  13F NOTICE.

[ ]  13F COMBINATION REPORT.



                              FORM 13F SUMMARY PAGE

Number of Other Included Managers:          None
List of Other Included Managers:            None

Form 13F File Number:                      Name:
No.

Form 13F Information Table Entry Total:        3
Form 13F Information Table Value Total: $246,097



                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 13F
                                INFORMATION TABLE

                           FORM 13F INFORMATION TABLE
                            AS OF DATE: June 30, 2008



ITEM 1                      ITEM 2        ITEM 3    ITEM 4          ITEM 5          ITEM 6   ITEM 7       ITEM 8
                                                     VALUE    SHARES/         PUT/ INVSTMT   OTHER   VOTING AUTHORITY
NAME OF ISSUER          TITLE OF CLASS    CUSIP    (x$1000)   PRN AMT  SH/PRN CALL DSCRETN MANAGERS* SOLE SHARED NONE
- --------------          -------------- ----------- -------- ---------- ------ ---- ------- --------- ---- ------ ----
                                                                                
Starent Networks, Corp. Common         85528P 10 8   87,283  6,938,256              Sole     None    Sole
Airvana, Inc.           Common         00950V 10 1   63,535 11,853,500              Sole     None    Sole
Netezza Corporation     Common         64111N 10 1   95,279  8,249,272              Sole     None    Sole