Exhibit

Exhibit 99.1

Arista Networks, Inc. Reports Second Quarter 2019 Financial Results

Places in the Cloud Networking Growth Continues with Record Earnings and Revenue

SANTA CLARA, Calif.- August 1, 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 second quarter ended June 30, 2019.

Second Quarter Financial Highlights


•	Revenue of $608.3 million, an increase of 2.2% compared to the first quarter of 2019, and an increase of 17.0% from the second quarter of 2018.


•	GAAP gross margin of 64.1%, compared to GAAP gross margin of 63.9% in the first quarter of 2019 and 64.2% in the second quarter of 2018.


•	Non-GAAP gross margin of 64.7%, compared to non-GAAP gross margin of 64.5% in the first quarter of 2019 and 64.5% in the second quarter of 2018.


•	GAAP net income of $189.3 million, or $2.33 per diluted share, compared to GAAP net loss of $155.3 million, or $2.08 per diluted share in the second quarter of 2018.


•	Non-GAAP net income of $198.6 million, or $2.44 per diluted share, compared to non-GAAP net income of $155.7 million, or $1.93 per diluted share in the second quarter of 2018.

“In Q2 2019, Arista raised the ante with innovative products in both 400G and Cognitive Campus. Our leadership in cloud area networking is now widely recognized by industry analysts, partners and customers.” stated Jayshree Ullal, Arista President and CEO.

Commenting on the company's financial results, Ita Brennan, Arista’s CFO, said, “The business continued to demonstrate solid earnings and cash flow generation for the quarter.”

Second Quarter Company Highlights


•	Arista Delivers Universal 400G Platforms for Cloud Network Transformation - Introduced the new Arista 7800R family for demanding 400G cloud networks and the next generation of the Arista 7500R, 7280R Series. The new platforms support 100G and 400G Ethernet with compelling throughput, density and price-performance and offer new telemetry and intelligence.


•	Arista Enables Cloud Area Networking on Microsoft Azure - Announced the next-generation hybrid cloud architecture for the enterprise. This new offering leverages the Microsoft Azure global network, integrates Arista EOS® with Azure and Azure Stack, focusing on the delivery of a seamless hybrid computing experience for organizations of any size.


•	Arista Cognitive Cloud Networking Redefines the Campus - Arista Networks announced an expansion of the cognitive campus portfolio with unified wired and wireless campus edge products designed to address transitional changes as the enterprise moves to an IoT (Internet of Things)-ready campus.


•	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.


•	Best Workplaces for Millennials™ 2019 - Arista Networks has been named to the "2019 Best Workplaces for Millennials" by Great Place to Work and FORTUNE.

Financial Outlook

For the third quarter of 2019, we expect:


•	Revenue between $647 million and $657 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 second 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 5568407.

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 third 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: Arista Networks’ limited operating history; Arista Networks’ rapid growth; Arista Networks’ customer concentration; the evolution and growth of the cloud networking market and the adoption by end customers of Arista Networks’ cloud networking solutions; changes in our customers’ demand for our products and services; requests for more favorable terms and conditions from our large end customers; declines in the sales prices of our products and services; customer order patterns or customer mix; the timing of orders and manufacturing and customer lead times; increased competition in our products and service markets; 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; the benefits and impact of acquisitions; rapid technological and market change; Arista Networks’ dispute with OptumSoft; our revenue growth rate; and general market, political, economic and business conditions. 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 May 6, 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 June 30,					Six Months Ended June 30,
	2019		2018			2019		2018
Revenue:
Product	$	513,171	$	444,767		$	1,018,586	$	852,384
Service	95,150		75,078			185,159		139,950
Total revenue	608,321		519,845			1,203,745		992,334
Cost of revenue:
Product	200,534		171,622			398,686		328,313
Service	17,596		14,340			34,298		27,219
Total cost of revenue	218,130		185,962			432,984		355,532
Total gross profit	390,191		333,883			770,761		636,802
Operating expenses:
Research and development	114,295		104,078			233,964		206,440
Sales and marketing	53,040		46,188			104,093		88,328
General and administrative	16,019		18,420			31,525		38,099
Legal settlement	—		405,000			—		405,000
Total operating expenses	183,354		573,686			369,582		737,867
Income (loss) from operations	206,837		(239,803		)	401,179		(101,065		)
Other income (expense), net	13,811		(2,169		)	26,144		1,987
Income (loss) before income taxes	220,648		(241,972		)	427,323		(99,078		)
Provision for (benefit from) income taxes	31,397		(86,703		)	37,043		(88,347		)
Net income (loss)	$	189,251	$	(155,269	)	$	390,280	$	(10,731	)
Net income (loss) attributable to common stockholders:
Basic	$	189,152	$	(155,187	)	$	390,063	$	(10,725	)
Diluted	$	189,158	$	(155,187	)	$	390,076	$	(10,725	)
Net income (loss) per share attributable to common stockholders:
Basic	$	2.47	$	(2.08	)	$	5.12	$	(0.14	)
Diluted	$	2.33	$	(2.08	)	$	4.80	$	(0.14	)
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders:
Basic	76,552		74,503			76,238		74,250
Diluted	81,335		74,503			81,271		74,250

ARISTA NETWORKS, INC.

Reconciliation of Selected GAAP to Non-GAAP Financial Measures

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
GAAP gross profit	$	390,191		$	333,883		$	770,761		$	636,802
GAAP gross margin	64.1		%	64.2		%	64.0		%	64.2		%
Stock-based compensation expense	1,028			1,236			2,126			2,438
Intangible asset amortization	2,626			—			5,251			—
Non-GAAP gross profit	$	393,845		$	335,119		$	778,138		$	639,240
Non-GAAP gross margin	64.7		%	64.5		%	64.6		%	64.4		%

GAAP income (loss) from operations	$	206,837		$	(239,803	)	$	401,179		$	(101,065	)
Stock-based compensation expense	24,297			22,478			48,588			43,329
Litigation expense	514			3,569			1,962			10,654
Legal settlement ⁽¹⁾	—			405,000			—			405,000
Intangible asset amortization	3,499			—			6,998			—
Non-GAAP income from operations	$	235,147		$	191,244		$	458,727		$	357,918
Non-GAAP operating margin	38.7		%	36.8		%	38.1		%	36.1		%

GAAP net income (loss)	$	189,251		$	(155,269	)	$	390,280		$	(10,731	)
Stock-based compensation expense	24,297			22,478			48,588			43,329
Litigation expense	514			3,569			1,962			10,654
Legal settlement ⁽¹⁾	—			405,000			—			405,000
Intangible asset amortization	3,499			—			6,998			—
Altera stock-based tax charge ⁽²⁾	9,781			—			9,781			—
(Gain) loss on investment in privately-held companies	—			9,100			(1,150		)	9,100
Tax benefit on stock-based awards	(23,455		)	(25,472		)	(60,509		)	(58,318		)
Income tax effect on non-GAAP exclusions	(5,324		)	(103,686		)	(9,657		)	(109,191		)
Non-GAAP net income	$	198,563		$	155,720		$	386,293		$	289,843

GAAP diluted net income (loss) per share attributable to common stockholders	$	2.33		$	(2.08	)	$	4.80		$	(0.14	)
Non-GAAP adjustments to net income (loss)	0.11			4.01			(0.05		)	3.73
Non-GAAP diluted net income per share	$	2.44		$	1.93		$	4.75		$	3.59
Weighted-average shares used in computing GAAP diluted net income (loss) per share attributable to common stockholders	81,335			74,503			81,271			74,250
Weighted-average shares used in computing Non-GAAP diluted net income per share attributable to common stockholders	81,335			80,826			81,271			80,774
Summary of Stock-Based Compensation Expense:
Cost of revenue	$	1,028		$	1,236		$	2,126		$	2,438
Research and development	12,568			11,745			25,699			22,690
Sales and marketing	7,097			6,274			13,631			12,234
General and administrative	3,604			3,223			7,132			5,967
Total	$	24,297		$	22,478		$	48,588		$	43,329

___________________

(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)



	June 30, 2019		December 31, 2018
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	944,414	$	649,950
Marketable securities	1,313,389		1,306,197
Accounts receivable	343,080		331,777
Inventories	314,177		264,557
Prepaid expenses and other current assets	113,458		162,321
Total current assets	3,028,518		2,714,802
Property and equipment, net	41,023		75,355
Acquisition-related intangible assets, net	51,612		58,610
Goodwill	53,684		53,684
Investments	31,486		30,336
Operating lease right-of-use assets	94,203		—
Deferred tax assets	113,660		126,492
Other assets	27,106		22,704
TOTAL ASSETS	$	3,441,292	$	3,081,983
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES:
Accounts payable	$	86,134	$	93,757
Accrued liabilities	113,898		123,254
Deferred revenue	272,366		358,586
Other current liabilities	52,622		30,907
Total current liabilities	525,020		606,504
Income taxes payable	45,804		36,167
Operating lease liabilities, non-current	89,705		—
Finance lease liabilities, non-current	—		35,431
Deferred revenue, non-current	229,852		228,641
Other long-term liabilities	25,351		31,851
TOTAL LIABILITIES	915,732		938,594
STOCKHOLDERS’ EQUITY:
Common stock	8		8
Additional paid-in capital	1,038,740		956,572
Retained earnings ⁽¹⁾	1,484,777		1,190,803
Accumulated other comprehensive income (loss)	2,035		(3,994		)
TOTAL STOCKHOLDERS’ EQUITY	2,525,560		2,143,389
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$	3,441,292	$	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)



	Six Months Ended June 30,
	2019			2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$	390,280		$	(10,731	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and other	16,757			11,328
Stock-based compensation	48,588			43,329
Noncash lease expense	7,955			—
Deferred income taxes	7,914			(18,281		)
(Gain) loss on investment in privately-held companies	(1,150		)	9,100
Accretion of investment discounts	(4,260		)	(783		)
Changes in operating assets and liabilities:
Accounts receivable, net	(11,303		)	(13,571		)
Inventories	(49,620		)	60,759
Prepaid expenses and other current assets	48,864			(72,418		)
Other assets	(4,635		)	629
Accounts payable	(6,783		)	3,597
Accrued liabilities	(9,476		)	(47,153		)
Accrued legal settlement	—			405,000
Deferred revenue	(85,009		)	(50,096		)
Income taxes payable	14,399			6,653
Other liabilities	3,955			(1,237		)
Net cash provided by operating activities	366,476			326,125
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of marketable securities	552,512			222,764
Purchases of marketable securities	(549,383		)	(696,665		)
Purchases of property and equipment	(8,639		)	(13,071		)
Investments in privately-held companies	—			(8,000		)
Other investing activities	—			(2,000		)
Net cash used in investing activities	(5,510		)	(496,972		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments of lease financing obligations	—			(921		)
Proceeds from issuance of common stock under equity plans	38,104			28,810
Tax withholding paid on behalf of employees for net share settlement	(4,662		)	(4,463		)
Repurchase of common stock	(100,008		)	—
Net cash provided by (used in) financing activities	(66,566		)	23,426
Effect of exchange rate changes	72			(607		)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	294,472			(148,028		)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —Beginning of period	654,164			864,697
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period	$	948,636		$	716,669