Exhibit

Exhibit 99.1

Arista Networks, Inc. Reports Third Quarter 2019 Financial Results

SANTA CLARA, Calif.- October 31, 2019 -- Arista Networks, Inc. (NYSE: ANET), an industry leader in software-driven cloud networking solutions for large datacenter and campus environments, today announced financial results for its third quarter ended September 30, 2019.

Third Quarter Financial Highlights


•	Revenue of $654.4 million, an increase of 7.6% compared to the second quarter of 2019, and an increase of 16.2% from the third quarter of 2018.


•	GAAP gross margin of 63.8%, compared to GAAP gross margin of 64.1% in the second quarter of 2019 and 64.2% in the third quarter of 2018.


•	Non-GAAP gross margin of 64.4%, compared to non-GAAP gross margin of 64.7% in the second quarter of 2019 and 64.6% in the third quarter of 2018.


•	GAAP net income of $208.9 million, or $2.59 per diluted share, compared to GAAP net income of $168.5 million, or $2.08 per diluted share in the third quarter of 2018.


•	Non-GAAP net income of $217.1 million, or $2.69 per diluted share, compared to non-GAAP net income of $171.3 million, or $2.11 per diluted share in the third quarter of 2018.

"In Q3 2019 we continued to see the adoption of our cloud networking technology in more diverse environments. While we expect a sudden softening in Q4 with a specific cloud titan customer, we are committed to a sustainable and strong foundation of long-term growth, innovation and profitability,” stated Jayshree Ullal, Arista President and CEO.

Commenting on the company's financial results, Ita Brennan, Arista’s CFO, said, “We saw continued solid business execution in the quarter with strong earnings and cash flow generation.”

Third Quarter Company Highlights


•	Arista Networks announced CloudVision 2019, building upon Arista’s cognitive management plane. The CloudVision 2019 release brings new capabilities and integrations, helping customers with operational cost reduction, risk management, and agility in network operations.


•	This is the fifth consecutive year Arista Networks has been recognized in the Leaders Quadrant of the 2019 Gartner Magic Quadrant for Data Center Networking, published on 15 July 2019.


•	Arista Networks announces that it is providing network platforms for SK Telecom’s 5G network.


•	Vocus Group, Australia’s specialist fibre and network solutions provider announced Arista Networks has been appointed the supplier of Vocus' Layer 2 and Layer 3 network equipment.

Financial Outlook

For the fourth quarter of 2019, we expect:


•	Revenue between $540 million and $560 million;


•	Non-GAAP gross margin between 63% to 65%, and


•	Non-GAAP operating margin of approximately 36%

Guidance for non-GAAP financial measures excludes stock-based compensation expense, amortization of acquisition-related intangible assets, and other non-recurring items. A reconciliation of non-GAAP guidance measures to corresponding GAAP measures is not available on a forward-looking basis (see further explanation below).

Prepared Materials and Conference Call Information

Arista executives will discuss the third quarter 2019 financial results on a conference call at 1:30 p.m. Pacific time today. To listen to the call via telephone, dial (833) 287-7905 in the United States or (647) 689-4469 from outside the US. The Conference ID is 7979217.

The financial results conference call will also be available via live webcast on our investor relations website at https://investors.arista.com/. Shortly after the conclusion of the conference call, a replay of the audio webcast will be available on Arista’s investor relations website.

Forward-Looking Statements

This press release contains “forward-looking statements” regarding our future performance, including statements in the section entitled “Financial Outlook,” such as estimates regarding revenue, non-GAAP gross margin and non-GAAP operating margin for the fourth quarter of fiscal 2019, and statements regarding the benefits from the introduction of new products and our leadership in cloud area networking. Forward-looking statements are subject to known and unknown risks, uncertainties, assumptions and other factors that could cause actual results, performance or achievements to differ materially from those anticipated in or implied by the forward-looking statements including risks associated with: the evolution and growth of the cloud networking market and the adoption by end customers of Arista Networks’ cloud networking solutions; rapid technological and market change; Arista’s customer concentration; changes in Arista's customers’ demand for our products and services; general market, political, economic and business conditions; Arista's rapid growth and our revenue growth rate; Arista's limited operating history; dependence on the introduction and market acceptance of new product offerings and standards including our 400G products as well as our campus and WiFi products; declines in the sales prices of our products and services; our ability to attract new large end customers or sell additional products and services to existing customers; competition in our products and service markets; requests for more favorable terms and conditions from our large end customers; customer order patterns or customer mix; the timing of orders and manufacturing and customer lead times; the benefits and impact of acquisitions; and Arista Networks’ dispute with OptumSoft. Additional risks and uncertainties that could affect Arista Networks can be found in Arista’s most recent Quarterly Report on Form 10-Q filed with the SEC on August 2, 2019, and other filings that the company makes to the SEC from time to time. You can locate these reports through our website at https://investors.arista.com/ and on the SEC’s website at https://www.sec.gov/. All forward-looking statements in this press release are based on information available to the company as of the date hereof and Arista Networks disclaims any obligation to publicly update or revise any forward-looking statement to reflect events that occur or circumstances that exist after the date on which they were made.

Gartner does not endorse any vendor, product or service depicted in its research publications, and does not advise technology users to select only those vendors with the highest ratings or other designation. Gartner research publications consist of the opinions of Gartner's research organization and should not be construed as statements of fact. Gartner disclaims all warranties, expressed or implied, with respect to this research, including any warranties of merchantability or fitness for a particular purpose.

Non-GAAP Financial Measures

This press release and accompanying table contain certain non-GAAP financial measures including non-GAAP gross profit, non-GAAP gross margin, non-GAAP income from operations, non-GAAP operating margins, non-GAAP net

income and non-GAAP diluted net income per share. These non-GAAP financial measures exclude stock-based compensation expense, litigation-related expenses, amortization of acquisition-related intangible assets, other non-recurring charges or benefits, and the income tax effect of these non-GAAP exclusions. In addition, non-GAAP financial measures exclude net tax benefits associated with stock-based awards, which include excess tax benefits, and other discrete indirect effects of such awards. The company uses these non-GAAP financial measures internally in analyzing its financial results and believes that these non-GAAP financial measures are useful to investors as an additional tool to evaluate ongoing operating results and trends. In addition, these measures are the primary indicators management uses as a basis for its planning and forecasting for future periods.

Non-GAAP financial measures are not meant to be considered in isolation or as a substitute for the comparable GAAP financial measures. Non-GAAP financial measures are subject to limitations, and should be read only in conjunction with the company's consolidated financial statements prepared in accordance with GAAP. Non-GAAP financial measures do not have any standardized meaning and are therefore unlikely to be comparable to similarly titled measures presented by other companies. A description of these non-GAAP financial measures and a reconciliation of the company’s non-GAAP financial measures to their most directly comparable GAAP measures has been provided in the financial statement tables included in this press release, and investors are encouraged to review the reconciliation.

The company’s guidance for non-GAAP financial measures excludes stock-based compensation expense, amortization of acquisition-related intangible assets, and other non-recurring items. The company does not provide guidance on GAAP gross margin or GAAP operating margin or the various reconciling items between GAAP gross margin and GAAP operating margin and non-GAAP gross margin and non-GAAP operating margin. A reconciliation of the non-GAAP financial measures guidance to the corresponding GAAP measures on a forward-looking basis is not available because stock-based compensation expense is impacted by the company’s future hiring and retention needs and the future fair market value of the company’s common stock, all of which are difficult to predict and subject to constant change. The actual amount of stock-based compensation expense will have a significant impact on the company’s GAAP gross margin and GAAP operating margin.

About Arista Networks

Arista Networks pioneered software-driven, cognitive cloud networking for large-scale datacenter and campus environments. Arista’s award-winning platforms redefine and deliver availability, agility, automation, analytics, and security. Arista has shipped more than twenty million cloud networking ports worldwide with CloudVision and EOS, an advanced network operating system. Committed to open standards across private, public and hybrid cloud solutions, Arista products are supported worldwide directly and through partners.

ARISTA, EOS, CloudVision, Cognitive WiFi and AlgoMatch are among the registered and unregistered trademarks of Arista Networks, Inc. in jurisdictions around the world. Other company names or product names may be trademarks of their respective owners.

Additional information and resources can be found at: https://www.arista.com.



Investor Contacts
Charles Yager Product and Investor Advocacy (408) 547-5892 cyager@arista.com		Chuck Elliott Business and Investor Development (408) 547-5549 chuck@arista.com

ARISTA NETWORKS, INC.

Condensed Consolidated Statements of Operations

(Unaudited in thousands, except per share amounts)



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Revenue:
Product	$	555,066	$	485,481	$	1,573,652	$	1,337,865
Service	99,349		77,828		284,508		217,778
Total revenue	654,415		563,309		1,858,160		1,555,643
Cost of revenue:
Product	218,220		187,764		616,906		516,077
Service	18,921		13,962		53,219		41,181
Total cost of revenue	237,141		201,726		670,125		557,258
Total gross profit	417,274		361,583		1,188,035		998,385
Operating expenses:
Research and development	118,732		117,589		352,696		324,029
Sales and marketing	55,279		47,903		159,372		136,231
General and administrative	14,657		15,321		46,182		53,420
Legal settlement	—		—		—		405,000
Total operating expenses	188,668		180,813		558,250		918,680
Income from operations	228,606		180,770		629,785		79,705
Other income (expense), net	19,169		8,619		45,313		10,606
Income before income taxes	247,775		189,389		675,098		90,311
Provision for (benefit from) income taxes	38,880		20,865		75,923		(67,482		)
Net income	$	208,895	$	168,524	$	599,175	$	157,793
Net income attributable to common stockholders:
Basic	$	208,799	$	168,439	$	598,861	$	157,706
Diluted	$	208,804	$	168,445	$	598,880	$	157,713
Net income per share attributable to common stockholders:
Basic	$	2.73	$	2.25	$	7.85	$	2.12
Diluted	$	2.59	$	2.08	$	7.38	$	1.95
Weighted-average shares used in computing net income per share attributable to common stockholders:
Basic	76,426		75,011		76,301		74,506
Diluted	80,753		81,018		81,104		80,844

ARISTA NETWORKS, INC.

Reconciliation of Selected GAAP to Non-GAAP Financial Measures

(Unaudited, in thousands, except percentages and per share amounts)



	Three Months Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
GAAP gross profit	$	417,274		$	361,583		$	1,188,035		$	998,385
GAAP gross margin	63.8		%	64.2		%	63.9		%	64.2		%
Stock-based compensation expense	1,258			1,268			3,384			3,706
Intangible asset amortization	2,626			1,198			7,877			1,198
Non-GAAP gross profit	$	421,158		$	364,049		$	1,199,296		$	1,003,289
Non-GAAP gross margin	64.4		%	64.6		%	64.5		%	64.5		%

GAAP income from operations	$	228,606		$	180,770		$	629,785		$	79,705
Stock-based compensation expense	26,257			23,254			74,845			66,583
Litigation expense (benefit)	—			(100		)	1,962			10,554
Legal settlement ⁽¹⁾	—			—			—			405,000
Intangible asset amortization	3,293			1,610			10,291			1,610
Acquisition-related costs	—			3,432			—			3,432
Non-GAAP income from operations	$	258,156		$	208,966		$	716,883		$	566,884
Non-GAAP operating margin	39.4		%	37.1		%	38.6		%	36.4		%

GAAP net income	$	208,895		$	168,524		$	599,175		$	157,793
Stock-based compensation expense	26,257			23,254			74,845			66,583
Litigation expense (benefit)	—			(100		)	1,962			10,554
Legal settlement ⁽¹⁾	—			—			—			405,000
Intangible asset amortization	3,293			1,610			10,291			1,610
Acquisition-related costs	—			3,432			—			3,432
Altera stock-based tax charge ⁽²⁾	—			—			9,781			—
(Gain) loss on investment in privately-held companies	(4,277		)	—			(5,427		)	9,100
Acquisition-related tax expense	—			5,853			—			5,853
Tax benefit on stock-based awards	(12,674		)	(26,130		)	(73,183		)	(84,448		)
Income tax effect on non-GAAP exclusions	(4,391		)	(5,149		)	(14,048		)	(114,340		)
Non-GAAP net income	$	217,103		$	171,294		$	603,396		$	461,137

GAAP diluted net income per share attributable to common stockholders	$	2.59		$	2.08		$	7.38		$	1.95
Non-GAAP adjustments to net income	0.10			0.03			0.06			3.75
Non-GAAP diluted net income per share	$	2.69		$	2.11		$	7.44		$	5.70
Weighted-average shares used in computing GAAP and Non-GAAP diluted net income per share attributable to common stockholders	80,753			81,018			81,104			80,844
Summary of Stock-Based Compensation Expense:
Cost of revenue	$	1,258		$	1,268		$	3,384		$	3,706
Research and development	13,472			12,010			39,171			34,700
Sales and marketing	7,832			6,537			21,463			18,771
General and administrative	3,695			3,439			10,827			9,406
Total	$	26,257		$	23,254		$	74,845		$	66,583

___________________

(1) Represents one-time charges associated with the settlement of our lawsuit with Cisco on August 6, 2018.

(2) Represents a discrete income tax expense related to stock based compensation as a result of an opinion on Altera Corporation and Subsidiaries vs. Commissioner on Internal Revenue issued by the Court of Appeals for the Ninth Circuit on June 7, 2019.

ARISTA NETWORKS, INC.

Condensed Consolidated Balance Sheets

(Unaudited, in thousands)



	September 30, 2019		December 31, 2018
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	1,095,265	$	649,950
Marketable securities	1,351,775		1,306,197
Accounts receivable	447,252		331,777
Inventories	239,802		264,557
Prepaid expenses and other current assets	106,326		162,321
Total current assets	3,240,420		2,714,802
Property and equipment, net	40,188		75,355
Acquisition-related intangible assets, net	48,319		58,610
Goodwill	54,855		53,684
Investments	4,150		30,336
Operating lease right-of-use assets	91,903		—
Deferred tax assets	110,630		126,492
Other assets	29,360		22,704
TOTAL ASSETS	$	3,619,825	$	3,081,983
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES:
Accounts payable	$	78,600	$	93,757
Accrued liabilities	128,930		123,254
Deferred revenue	291,384		358,586
Other current liabilities	49,275		30,907
Total current liabilities	548,189		606,504
Income taxes payable	60,278		36,167
Operating lease liabilities, non-current	87,099		—
Finance lease liabilities, non-current	—		35,431
Deferred revenue, non-current	237,628		228,641
Other long-term liabilities	30,627		31,851
TOTAL LIABILITIES	963,821		938,594
STOCKHOLDERS’ EQUITY:
Common stock	8		8
Additional paid-in capital	1,076,732		956,572
Retained earnings ⁽¹⁾	1,579,063		1,190,803
Accumulated other comprehensive income (loss)	201		(3,994		)
TOTAL STOCKHOLDERS’ EQUITY	2,656,004		2,143,389
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	3,619,825	$	3,081,983
______________________
(1) We adopted new lease accounting guidance under ASC 842, which resulted in a cumulative-effect adjustment of $3.7 million to retained earnings as of January 1, 2019.

ARISTA NETWORKS, INC.

Condensed Consolidated Statements of Cash Flows

(Unaudited, in thousands)



	Nine Months Ended September 30,
	2019			2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	599,175		$	157,793
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	24,948			18,440
Stock-based compensation	74,845			66,583
Noncash lease expense	12,007			—
Deferred income taxes	10,945			(49,615		)
(Gain) loss on investment in privately-held companies	(5,427		)	9,100
Accretion of investment discounts	(6,032		)	(1,863		)
Changes in operating assets and liabilities:
Accounts receivable, net	(115,475		)	(68,192		)
Inventories	24,951			98,284
Prepaid expenses and other current assets	59,388			(50,507		)
Other assets	(7,009		)	(767		)
Accounts payable	(14,361		)	30,515
Accrued liabilities	5,731			(35,917		)
Deferred revenue	(58,216		)	13,161
Income taxes payable	29,808			10,311
Other liabilities	595			9,974
Net cash provided by operating activities	635,873			207,300
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of marketable securities	806,519			366,999
Purchases of marketable securities	(840,098		)	(827,198		)
Business acquisitions, net of cash acquired	(1,365		)	(95,640		)
Purchases of property and equipment	(13,319		)	(17,613		)
Proceeds from (purchases of) investments in privately-held companies	28,220			(8,000		)
Other investing activities	—			(2,000		)
Net cash used in investing activities	(20,043		)	(583,452		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments of lease financing obligations	—			(1,392		)
Proceeds from issuance of common stock under equity plans	52,177			49,642
Tax withholding paid on behalf of employees for net share settlement	(7,069		)	(6,914		)
Repurchase of common stock	(214,617		)	—
Net cash provided by (used in) financing activities	(169,509		)	41,336
Effect of exchange rate changes	(994		)	(984		)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	445,327			(335,800		)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —Beginning of period	654,164			864,697
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period	$	1,099,491		$	528,897