Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
DUNLEVIE BRUCE
   2. Issuer Name and Ticker or Trading Symbol
AMBARELLA INC [AMBA] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
2480 SAND HILL ROAD, SUITE 200		 3. Date of Earliest Transaction (Month/Day/Year)
10/15/2012
(Street)

MENLO PARK, CA 94025		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Ordinary Shares 10/15/2012   C   2,777,777 A (2) 2,777,777 I See footnote (1)
Ordinary Shares 10/15/2012   C   558,347 A (3) 3,336,124 I See footnote (1)
Ordinary Shares 10/15/2012   C   370,370 A (4) 3,706,494 I See footnote (1)
Ordinary Shares 10/15/2012   S   555,974 D $ 6 3,150,520 I See footnote (1)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Series A Convertible Preference Shares (2) 10/15/2012   C     2,777,777   (2)   (2) Ordinary Shares 2,777,777 $ 0 0 I See footnotes (1)
Series B Convertible Preference Shares (3) 10/15/2012   C     558,347   (3)   (3) Ordinary Shares 558,347 $ 0 0 I See footnotes (1)
Series C Convertible Preference Shares (4) 10/15/2012   C     370,370   (4)   (4) Ordinary Shares 370,370 $ 0 0 I See footnotes (1)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
DUNLEVIE BRUCE
2480 SAND HILL ROAD
SUITE 200
MENLO PARK, CA 94025		     X    

Signatures

 /s/ Steven M. Spurlock, by power of attorney for Bruce W. Dunlevie   10/15/2012
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Shares held of record by Benchmark Capital Partners IV, L.P. or BCP IV, as nominee for Benchmark Capital Partners IV, L.P., Benchmark Founders' Fund IV, L.P., Benchmark Founders' Fund IV-A, L.P., and Benchmark Founders' Fund IV-B, L.P. and related individuals, or the Benchmark Funds. Benchmark Capital Management Co IV, L.L.C., or BCMC IV, is the general partner of BCP IV. BCMC IV's managing members are Alexandre Balkanski, Bruce W. Dunlevie, J. William Gurley, Kevin R. Harvey, Robert C. Kagle and Steven M. Spurlock. These individuals may be deemed to have shared voting and investment power over the shares held by the Benchmark Funds. Each of these indivduals disclaims beneficial ownership of such shares except to the extent of such individual's pecuniary interest therein.
(2) The Series A Convertible Preference Shares converted into Ordinary Shares on a 1-to-1 basis and had no expiration date.
(3) The Series A Convertible Preference Shares converted into Ordinary Shares on a 1-to-1 basis and had no expiration date.
(4) The Series A Convertible Preference Shares converted into Ordinary Shares on a 1-to-1 basis and had no expiration date.
 
Remarks:
Alexandre Balkanski, Bruce W. Dunlevie, J. William Gurley, Kevin R. Harvey, Robert C. Kagle and Steven M. Spurlock are the managing
members of Benchmark Capital Management Co IV, L.L.C., which serves as general partner to Benchmark Capital Partners IV, L.P., Benchmark
Founders' Fund IV, Benchmark Founders Fund IV-A, L.P. and Benchmark Founders Fund IV-B, L.P. and may be deemed to share voting
and investment power over the shares beneficially held by such entities.  Each such person and entity disclaims the existence of a "group"
and disclaims beneficial ownership of any securities (except to the extent of such person's or entity's pencuniary
interest in such securities ) other than any securities being reported herein as being directly owned by such person or entity. The
filing of this report is not an admission that any Reporting Persons is the beneficial owners of these shares for purposes of Section
16 or for any other purpose.  *This report is one of two reports, each on a separate Form 4, but relating to the same transaction
being filed by entities affiliated with Benchmark Capital and their applicable members.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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