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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Schedule 13G

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1 (b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 (b)

(Amendment No. __) *


Fortinet, Inc.

 (Name of Issuer)

Common Stock, par value $0.001

(Title of Class of Securities)

34959E109

(CUSIP Number)

December 31, 2009

(Date of Event Which Requires Filing of this Statement)

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

o

Rule 13d-1(b)

o

Rule 13d-1(c)

x

Rule 13d-1(d)

*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.

The information required on 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).

(Continued on following pages)

Page 1 of 14 Pages

Exhibit Index Contained on Page 13





CUSIP NO. 34959E109

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Page 2 of 14




1

NAME OF REPORTING PERSON

Meritech Capital Partners II L.P. (“MCP II”)

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a)

o

(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
6,131,510 shares, except that Meritech Capital Associates II L.L.C. (“MCA II”), the general partner of MCP II, may be deemed to have sole voting power with respect to such shares, Meritech Management Associates II L.L.C. (“MMA II”), a managing member of MCA II, may be deemed to have sole voting power with respect to such shares, and Paul Madera (“Madera”) and Michael Gordon (“Gordon”), the managing members of MMA II, may be deemed to have shared voting power with respect to such shares.

6

SHARED VOTING POWER
See response to row 5.

7

SOLE DISPOSITIVE POWER
6,131,510 shares, except that MCA II, the general partner of MCP II, may be deemed to have sole dispositive power with respect to such shares, MMA II, a managing member of MCA II, may be deemed to have sole dispositive power with respect to such shares, and Madera and Gordon, the managing members of MMA II, may be deemed to have shared dispositive power with respect to such shares.

8

SHARED DISPOSITIVE POWER
See response to row 7.

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
REPORTING PERSON

6,131,510

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9
EXCLUDES CERTAIN SHARES*

o

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

9.2%

12

TYPE OF REPORTING PERSON*

PN







CUSIP NO. 34959E109

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Page 3 of 14




1

NAME OF REPORTING PERSON

Meritech Capital Affiliates II L.P. (“MC AFF II”)

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a)

o

(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
157,770 shares, except that MCA II, the general partner of MC AFF II, may be deemed to have sole voting power with respect to such shares, MMA II, a managing member of MCA II, may be deemed to have sole voting power with respect to such shares, and Madera and Gordon, the managing members of MMA II, may be deemed to have shared voting power with respect to such shares.

6

SHARED VOTING POWER
See response to row 5.

7

SOLE DISPOSITIVE POWER
157,770 shares, except that MCA II, the general partner of MC AFF II, may be deemed to have sole dispositive power with respect to such shares, MMA II, a managing member of MCA II, may be deemed to have sole dispositive power with respect to such shares, and Madera and Gordon, the managing members of MMA II, may be deemed to have shared dispositive power with respect to such shares.

8

SHARED DISPOSITIVE POWER
See response to row 7.

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
REPORTING PERSON

157,770

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES*

o

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

0.2%

12

TYPE OF REPORTING PERSON*

PN







CUSIP NO. 34959E109

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Page 4 of 14




1

NAME OF REPORTING PERSON

MCP Entrepreneur Partners II L.P. (“MEP II”)

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a)

o

(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
46,888 shares, except that MCA II, the general partner of MEP II, may be deemed to have sole voting power with respect to such shares, MMA II, a managing member of MCA II, may be deemed to have sole voting power with respect to such shares, and Madera and Gordon, the managing members of MMA II, may be deemed to have shared voting power with respect to such shares.

6

SHARED VOTING POWER
See response to row 5.

7

SOLE DISPOSITIVE POWER
46,888 shares, except that MCA II, the general partner of MEP II, may be deemed to have sole dispositive power with respect to such shares, MMA II, a managing member of MCA II, may be deemed to have sole dispositive power with respect to such shares, and Madera and Gordon, the managing members of MMA II, may be deemed to have shared dispositive power with respect to such shares.

8

SHARED DISPOSITIVE POWER
See response to row 7.

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
REPORTING PERSON

46,888

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES*

o

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

0.1%

12

TYPE OF REPORTING PERSON*

PN








CUSIP NO. 34959E109

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Page 5 of 14




1

NAME OF REPORTING PERSON

Meritech Capital Associates II LLC

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a)

o

(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
6,336,168 shares, of which 6,131,510 shares are held by MCP II, 157,770 shares are held by MC AFF II, and 46,888 shares are held by MEP II, for whom MCA II serves as general partner, except that MMA II, a managing member of MCA II, may be deemed to have sole power to vote these shares, and Madera and Gordon, the managing members of MMA II, may be deemed to have shared power to vote these shares.

6

SHARED VOTING POWER
See response to row 5.

7

SOLE DISPOSITIVE POWER
6,336,168 shares, of which 6,131,510 shares are held by MCP II, 157,770 shares are held by MC AFF II, and 46,888 shares are held by MEP II, for whom MCA II serves as general partner, except that MMA II, a managing member of MCA II, may be deemed to have sole power to dispose of these shares, and Madera and Gordon, the managing members of MMA II, may be deemed to have shared power to dispose of these shares.

8

SHARED DISPOSITIVE POWER
See response to row 7.

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
REPORTING PERSON

6,336,168

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES*

o

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

9.5%

12

TYPE OF REPORTING PERSON*

OO







CUSIP NO. 34959E109

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Page 6 of 14




1

NAME OF REPORTING PERSON

Meritech Management Associates II L.L.C

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a)

o

(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
6,336,168 shares, of which 6,131,510 shares are held by MCP II, 157,770 shares are held by MC AFF II, and 46,888 shares are held by MEP II. MMA II serves as a managing member of MCA II, the general partner of such entities. Madera and Gordon, the managing members of MMA II, may be deemed to have shared power to vote these shares.

6

SHARED VOTING POWER
See response to row 5.

7

SOLE DISPOSITIVE POWER
6,336,168 shares, of which 6,131,510 shares are held by MCP II, 157,770 shares are held by MC AFF II, and 46,888 shares are held by MEP II. MMA II serves as a managing member of MCA II, the general partner of such entities. Madera and Gordon, the managing members of MMA II, may be deemed to have shared power to dispose of these shares.

8

SHARED DISPOSITIVE POWER
See response to row 7.

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
REPORTING PERSON

6,336,168

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES*

o

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

9.5%

12

TYPE OF REPORTING PERSON*

OO









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Page 7 of 14




1

NAME OF REPORTING PERSON      Paul Madera

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a)

o

(b)

x

3

SEC USE ONLY

4

CITIZENSHIP OR PLACE OF ORGANIZATION

U.S. Citizen

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY EACH

REPORTING

PERSON

WITH

5

SOLE VOTING POWER
0 shares

6

SHARED VOTING POWER
6,336,168 shares, of which 6,131,510 shares are held by MCP II, 157,770 shares are held by MC AFF II, and 46,888 shares are held by MEP II. MCA II is the general partner of such entities and Madera, as a managing member of MMA II, a managing member of MCA II, may be deemed to have shared power to vote these shares.

7

SOLE DISPOSITIVE POWER
0 shares

8

SHARED DISPOSITIVE POWER
6,336,168 shares, of which 6,131,510 shares are held by MCP II, 157,770 shares are held by MC AFF II, and 46,888 shares are held by MEP II. MCA II is the general partner of such entities and Madera, as a managing member of MMA II, a managing member of MCA II, may be deemed to have shared power to dispose of these shares.

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
REPORTING PERSON

6,336,168

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES*

o

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

9.5%

12

TYPE OF REPORTING PERSON*

IN









CUSIP NO. 34959E109

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Page 8 of 14




1

NAME OF REPORTING PERSON      Michael Gordon

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a)

o

(b)

x

3

SEC USE ONLY

4

CITIZENSHIP OR PLACE OF ORGANIZATION

U.S. Citizen

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY EACH

REPORTING

PERSON

WITH

5

SOLE VOTING POWER
0 shares

6

SHARED VOTING POWER
6,336,168 shares, of which 6,131,510 shares are held by MCP II, 157,770 shares are held by MC AFF II, and 46,888 shares are held by MEP II. MCA II is the general partner of such entities and Gordon, as a managing member of MMA II, a managing member of MCA II, may be deemed to have shared power to vote these shares.

7

SOLE DISPOSITIVE POWER
0 shares

8

SHARED DISPOSITIVE POWER
6,336,168 shares, of which 6,131,510 shares are held by MCP II, 157,770 shares are held by MC AFF II, and 46,888 shares are held by MEP II. MCA II is the general partner of such entities and Gordon, as a managing member of MMA II, a managing member of MCA II, may be deemed to have shared power to dispose of these shares.

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
REPORTING PERSON

6,336,168

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES*

o

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

9.5%

12

TYPE OF REPORTING PERSON*

IN







CUSIP NO. 34959E109

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Page 9 of 14




ITEM 1(A).

NAME OF ISSUER

Fortinet, Inc.

ITEM 1(B).

ADDRESS OF ISSUER’S PRINCIPAL EXECUTIVE OFFICES

1090 Kifer Road

Sunnyvale, CA 94086


ITEM 2(A).

NAME OF PERSONS FILING

This Statement is filed by Meritech Capital Partners II L.P., a Delaware limited partnership (“MCP II”), Meritech Capital Affiliates II L.P., a Delaware limited partnership (“MC AFF II”), MCP Entrepreneur Partners II L.P., a Delaware limited partnership (“MEP II”), Meritech Capital Associates II L.L.C., a Delaware limited liability company (“MCA II”), Meritech Management Associates II L.L.C., a Delaware limited liability company (“MMA II”), Paul Madera (“Madera”) and Michael Gordon (“Gordon”). The foregoing entities and individuals are collectively referred to as the “Reporting Persons.”  

MCA II is the general partner of each of MCP II, MC AFF II and MEP II, and may be deemed to have indirect beneficial ownership of shares of the issuer directly owned by MCP II, MC AFF II and MEP II.  MMA II is a managing member of MCA II and may be deemed to have indirect beneficial ownership of shares of the issuer directly owned by MCP II, MC AFF II and MEP II.  Madera and Gordon are managing members of MMA II and may be deemed to have indirect beneficial ownership of shares of the issuer directly owned by MCP II, MC AFF II and MEP II.

ITEM 2(B).

ADDRESS OF PRINCIPAL OFFICE

The address for each of the Reporting Persons is:


Meritech Capital Partners
245 Lytton Ave, Suite 350
Palo Alto, CA  94301

ITEM 2(C).

CITIZENSHIP

MCP II, MC AFF II and MEP II are Delaware limited partnerships.  MCA II and MMA II are Delaware limited liability companies.  Madera and Gordon are United States citizens.

ITEM 2(D) AND (E).

TITLE OF CLASS OF SECURITIES AND CUSIP NUMBER

Common Stock
CUSIP # 34959E109

ITEM 3.

Not Applicable.







CUSIP NO. 34959E109

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ITEM 4.

OWNERSHIP

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.  

(a)

Amount beneficially owned:

See Row 9 of cover page for each Reporting Person.

(b)

Percent of Class:

See Row 11 of cover page for each Reporting Person.

(c)

Number of shares as to which such person has:

(i)

Sole power to vote or to direct the vote:

See Row 5 of cover page for each Reporting Person.

(ii)

Shared power to vote or to direct the vote:

See Row 6 of cover page for each Reporting Person.

(iii)

Sole power to dispose or to direct the disposition of:

See Row 7 of cover page for each Reporting Person.

(iv)

Shared power to dispose or to direct the disposition of:

See Row 8 of cover page for each Reporting Person.

ITEM 5.

OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

Not applicable.

ITEM 6.

OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

Under certain circumstances set forth in the limited partnership agreements of MCP II, MC AFF II and MEP II, and the limited liability company agreements of MCA II and MMA II, the general and limited partners or members, as the case may be, of each of such entities may be deemed to have the right to receive dividends from, or the proceeds from, the sale of shares of the issuer owned by each such entity of which they are a partner or member, as the case may be.

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.







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Page 11 of 14




ITEM 8.

IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

Not applicable.

ITEM 9.

NOTICE OF DISSOLUTION OF GROUP

Not applicable.

ITEM 10.

CERTIFICATION

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.









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Page 12 of 14




SIGNATURES



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 12, 2010


MERITECH CAPITAL PARTNERS II L.P.

By:  Meritech Capital Associates II L.L.C.

its General Partner


By:  Meritech Management Associates II L.L.C.

a managing member


By: /s/ Paul S. Madera                                       

Paul S. Madera, a managing member


MERITECH CAPITAL AFFILIATES II L.P.

By:  Meritech Capital Associates II L.L.C.

its General Partner


By:  Meritech Management Associates II L.L.C.

a managing member


By: /s/ Paul S. Madera                                       

Paul S. Madera, a managing member


MCP ENTREPRENEUR PARTNERS II L.P.


By:  Meritech Capital Associates II L.L.C.

its General Partner

By:  Meritech Management Associates II L.L.C.

a managing member

By: /s/ Paul S. Madera                                       

Paul S. Madera, a managing member


MERITECH CAPITAL ASSOCIATES II L.L.C.

By:  Meritech Management Associates II L.L.C.

a managing member


By: /s/ Paul S. Madera                                       

Paul S. Madera, a managing member


MERITECH MANAGEMENT ASSOCIATES II L.L.C.


By: /s/ Paul S. Madera                                       

Paul S. Madera, a managing member


/s/ Paul S. Madera                                             

Paul S. Madera



/s/ Michael B. Gordon                                      

Michael B. Gordon

The original statement shall be signed by each person on whose behalf the statement is filed or his authorized representative. If the statement is signed on behalf of a person by his authorized representative other than an executive officer or general partner of the filing person, evidence of the representative's authority to sign on behalf of such person shall be filed with the statement, provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference. The name and any title of each person who signs the statement shall be typed or printed beneath his signature.


NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for

other parties for whom copies are to be sent.


Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001)







CUSIP NO. 34959E109

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Page 13 of 14




EXHIBIT INDEX


 

Found on

Sequentially

Numbered Page

Exhibit


Exhibit A:  Agreement of Joint Filing


14








CUSIP NO. 34959E109

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Page 14 of 14




EXHIBIT A


Agreement of Joint Filing


The undersigned hereby agree that a single Schedule 13G (or any amendment thereto) relating to the Common Stock of Fortinet, Inc. shall be filed on behalf of each of the undersigned and that this Agreement shall be filed as an exhibit to such Schedule 13G.

Date: February 12, 2010


MERITECH CAPITAL PARTNERS II L.P.

By:  Meritech Capital Associates II L.L.C.

its General Partner


By:  Meritech Management Associates II L.L.C.

a managing member


By: /s/ Paul S. Madera                                       

Paul S. Madera, a managing member


MERITECH CAPITAL AFFILIATES II L.P.


By:  Meritech Capital Associates II L.L.C.

its General Partner



By:  Meritech Management Associates II L.L.C.

a managing member


By: /s/ Paul S. Madera                                       

Paul S. Madera, a managing member


MCP ENTREPRENEUR PARTNERS II L.P.


By:  Meritech Capital Associates II L.L.C.

its General Partner

By:  Meritech Management Associates II L.L.C.

a managing member

By: /s/ Paul S. Madera                                       

Paul S. Madera, a managing member


MERITECH CAPITAL ASSOCIATES II L.L.C.

By:  Meritech Management Associates II L.L.C.

a managing member


By: /s/ Paul S. Madera                                       

Paul S. Madera, a managing member


MERITECH MANAGEMENT ASSOCIATES II L.L.C.



By: /s/ Paul S. Madera                                        

Paul S. Madera, a managing member


/s/ Paul S. Madera                                               

Paul S. Madera



/s/ Michael B. Gordon                                         

Michael B. Gordon