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Form 4 Arista Networks, Inc. For: Aug 22 Filed by: MATHER ANN

August 24, 2016 8:27 PM EDT
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person *
MATHER ANN

(Last) (First) (Middle)
5453 GREAT AMERICA PARKWAY

(Street)
SANTA CLARA CA 95054

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Arista Networks, Inc. [ ANET ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
08/22/2016
4. 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 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
Common Stock 08/22/2016   M   833.00 A $ 0 (1) 833 D  
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 Securities Underlying Derivative Security (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: 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
Restricted Stock Unit $ 0 (1) 08/22/2016   M     833.00   (2)   (2) Common Stock 833 $ 0 9,167 D  
Explanation of Responses:
1. Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.
2. The reporting person was granted 10,000 RSU's on June 13th, 2016. 1/12th of the shares vested on August 22, 2016 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, or November 20 of each year.
By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Ann Mather 08/24/2016
** 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 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).
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 
Arista Networks, Inc. (the Company), hereby constitutes and 
appoints Isabelle Bertin-Bailly, Ita Brennan and Marc Taxay, the 
undersigneds true and lawful attorneys-in-fact to:
1.	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 
undersigneds ownership, acquisition or disposition of 
securities of the Company; and
2.	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 undersigneds 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 undersigneds 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 18th day of August, 2016.
Signature: /s/Ann Mather
Print Name:  Ann Mather



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