SEC FORM 3 SEC Form 3
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
MENG TERESA H

(Last) (First) (Middle)
3101 JAY STREET

(Street)
SANTA CLARA CA 95054

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
10/15/2018
3. Issuer Name and Ticker or Trading Symbol
AMBARELLA INC [ AMBA ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
5. If Amendment, Date of 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
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units (1) 09/15/2019 Ordinary Shares 5,248 (2) D
Explanation of Responses:
1. The restricted stock units will vest as to 1/4th of the restricted stock units each three months following the vesting start date of September 15, 2018, so as to be 100% vested on September 15, 2019.
2. Each restricted stock unit represents a contingent right to receive one share of Ambarella, Inc. Ordinary Shares.
By: /s/ Michael Morehead, Attorney in Fact For: Teresa Meng 10/17/2018
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
POWER OF ATTORNEY

The undersigned, as a Section 16 reporting person of Ambarella, Inc. 
(the "Company"), hereby constitutes and appoints Feng-Ming Wang, 
Kevin C. Eichler, and Michael Morehead, the undersigned's true and lawful 
attorneys-in-fact to: 

    1.     prepare, execute in the undersigned's name and on the undersigned's 
behalf, and submit to the Securities and Exchange Commission (the "SEC") 
a Form ID, including amendments thereto, and any other documents 
necessary or appropriate to obtain EDGAR codes and passwords enabling 
the undersigned to make electronic filings with the SEC of reports required 
by Section 16(a) of the Securities Exchange Act of 1934 or any rule or 
regulation of the SEC;

    2.     complete and execute Forms 3, 4 and 5 and other forms and all 
amendments thereto as such attorneys-in-fact shall in their discretion 
determine to be required or advisable pursuant to Section 16 of the 
Securities Exchange Act of 1934 (as amended) and the rules and regulations 
promulgated thereunder, or any successor laws and regulations, 
as a consequence of the undersigned's ownership, acquisition or 
disposition of securities of the Company; and

    3.     do all acts necessary in order to file such forms with the 
Securities and Exchange Commission,
 any securities exchange or national 
association, the Company and such other person or agency as the 
attorneys-in-fact shall deem appropriate.

    The undersigned hereby ratifies and confirms all that said 
attorneys-in-fact and agent shall do or cause to be done by virtue hereof.  
The undersigned acknowledges that the foregoing attorneys-in-fact, in serving 
in such capacity at the request of the undersigned, is not assuming, nor is the 
Company assuming, any of the undersigned's responsibilities to 
comply with Section 16 of the Securities Exchange Act of 1934 (as amended).
       
    This Power of Attorney shall remain in full force and effect until the 
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the 
undersigned's holdings of and transactions in securities issued by the Company, 
unless earlier revoked by the undersigned in a signed writing delivered to the 
Company and the foregoing attorneys-in-fact. 
       
    IN WITNESS WHEREOF, the undersigned has caused this Power of 
Attorney to be executed as of this 11th day of October, 2018.


Signature:   /s/ Teresa H. Meng	

Print Name:  Teresa H. Meng