2010 David R Cheriton Irrevocable Trust dtd July 28, 2010 SC 13G/AArista Networks, Inc.

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 the disclosures provided in a prior cover page.

Name of Issuer:

Arista Networks, Inc.

Address of Issuer’s Principal Executive Offices:

5453 Great America Parkway

Santa Clara, CA 95054

Name of Person Filing; Address of Principal Business Office or, if none, Residence; Citizenship

Title of Class of Securities:

Common Stock, $0.0001 par value per share

CUSIP Number:

040413106

If this statement is filed pursuant to Rules13d-1(b), or13d-2(b) or (c), check whether the person filing is a:

☐ Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

☐ Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

☐ Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

☐ Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C.80a-8).

☐ An investment advisor in accordance with§240.13d-1(b)(1)(ii)(E);

☐ An employee benefit plan or endowment fund in accordance with§240.13d-1(b)(1)(ii)(F);

☐ A parent holding company or control person in accordance with§240.13d-1(b)(1)(ii)(G);

☐ A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

☐ A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C.80a-3);

☐ Anon-U.S. institution in accordance with §240.13d–1(b)(1)(ii)(J);

☐ Group, in accordance with §240.13d–1(b)(1)(ii)(K). If filing as anon-U.S. institution in accordance with §240.13d–1(b)(1)(ii)(J), please specify the type of institution: ____

Ownership.

Amount beneficially owned: The 2010 David R. Cheriton Irrevocable Trust dtd July 28, 2010 (the “Trust”) is deemed to be the beneficial owner of 4,217,061 shares of common stock. The Trust holds no options to purchase shares of common stock.

Percent of class: The Trust’s percentage ownership is calculated based on 76,399,052 shares of common stock outstanding as of as October 25, 2019 as reported on the Issuer’s Quarterly Report on Form10-Q filed with the Securities and Exchange Commission on November 1, 2019.

Number of shares as to which the person has:

Sole power to vote or to direct the vote:        4,217,061 shares (See item 4(a) above).

Shared power to vote or to direct the vote:        0 shares (See item 4(a) above).

Sole power to dispose or to direct the disposition of:        4,217,061 shares (See item 4(a) above).

Shared power to dispose or to direct the disposition of:        0 shares (See item 4(a) above).

Ownership of Five Percent or Less of a Class.

Ownership of More than Five Percent on Behalf of Another Person.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.

Identification and Classification of Members of the Group.

Notice of Dissolution of Group.

Certifications.