Exhibit

Gigamon will file relevant materials with the Securities and Exchange Commission (the "SEC") in connection with the proposed merger, including a preliminary proxy statement on Schedule 14A. Under the proposed terms, promptly after filing its definitive proxy statement with the SEC, Gigamon will mail or otherwise make available the definitive proxy statement and a proxy card to each stockholder entitled to vote at the special meeting relating to the proposed transaction. GIGAMON STOCKHOLDERS AND OTHER INVESTORS ARE ADVISED TO CAREFULLY READ THESE MATERIALS (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN RESPECT OF THE PROPOSED MERGER WHEN THEY BECOME AVAILABLE, AS THOSE DOCUMENTS WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED MERGER AND THE PARTIES

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements generally relate to future events, including the timing of the proposed transaction and other information related to the proposed transaction. In some cases, you can identify forward-looking statements because they contain words such as "may," "will," "should," "expects," "plans," "anticipates," "could," "intends," "target," "projects," "contemplates," "believes," "estimates," "predicts," "potential" or "continue" or the negative of these words or other similar terms or expressions that concern the proposed transaction and our expectations, strategy, plans or intentions regarding it. Forward-looking statements in this press release include, but are not limited to, our pending acquisition by Elliott Management. Our expectations and beliefs regarding these matters may not materialize, and actual results in future periods are subject to risks and uncertainties that could cause actual results to differ materially from those projected. These risks include the risk that the transaction may not be completed in a timely manner or at all, which may adversely affect our business and the trading price of our common stock; the failure to satisfy the conditions to closing of the transaction, including obtaining regulatory and shareholder approval; the occurrence of any event, change or other circumstance that could give rise to the termination of the definitive agreement; the potential for litigation relating to the transaction; the risk that the definitive agreement may be terminated in circumstances that require us to pay a termination fee; the effect of the announcement or pendency of the transaction on our business relationships, results of operations and business generally; risks that the proposed transaction disrupts current plans and operations; risk related to diverting management's attention; and general market, political, economic and business conditions. The forward-looking statements contained in this press release are also subject to other risks and uncertainties, including those more fully described in our filings with the Securities and Exchange Commission, including our Annual Report on Form 10-K for the period ended December 31, 2016 and our most recently filed quarterly report on Form 10-Q. The forward-looking statements in this press release are based on information available to Gigamon as of the date hereof.

In addition to disclosing financial measures prepared in accordance with U.S. generally accepted accounting principles (GAAP), this press release and accompanying tables contain certain non-GAAP financial measures that exclude stock-based compensation and related payroll taxes, income tax effects of stock-based compensation expense, non-recurring items such as restructuring charges and advisory services and other costs related to non-routine stockholder matters, and periodic tax items. Non-GAAP financial measures do not have any standardized meaning and our non-GAAP financial measures may not be comparable to similarly titled measures presented by other companies. Gigamon considers these non-GAAP financial measures important because they provide useful measures of the operating performance of the company, exclusive of unusual events or factors that do not directly affect what we consider core to our operating performance, and are used by the company's management for that purpose. In addition, investors often use similar measures to evaluate the operating performance of a company. We present non-GAAP financial measures for supplemental informational purposes only to provide additional information in understanding the company's operating results. The non-GAAP financial measures should not be considered a substitute for financial information presented in accordance with GAAP. Please see the reconciliation of non-GAAP financial measures to the most directly comparable GAAP measures attached to this release.

Gigamon (NYSE: GIMO) provides active visibility into physical and virtual network traffic, enabling stronger security and superior performance. Gigamon's Visibility Fabric and GigaSECURE®, the industry's first Security Delivery Platform, deliver advanced intelligence so that security, network and application performance management solutions in enterprise, government and service provider networks operate more efficiently and effectively. See more at www.gigamon.com, the Gigamon Blog, or follow Gigamon on Twitter, LinkedIn or Facebook.



	Three Months Ended						Nine Months Ended
	September 30, 2017			October 1, 2016			September 30, 2017			October 1, 2016
Revenue:
Product	$	51,861		$	59,835		$	139,063		$	155,805
Service	27,330			23,677			78,832			70,021
Total revenue	79,191			83,512			217,895			225,826
Cost of revenue:
Product	11,401			12,197			32,429			34,414
Service	3,049			2,141			8,649			6,562
Total cost of revenue	14,450			14,338			41,078			40,976
Gross profit	64,741			69,174			176,817			184,850
Operating expenses:
Research and development	18,783			18,306			59,451			50,914
Sales and marketing	34,914			31,994			105,247			88,494
General and administrative	10,697			8,887			30,033			26,029
Total operating expenses	64,394			59,187			194,731			165,437
Income (loss) from operations	347			9,987			(17,914		)	19,413
Other income (expense):
Interest income	541			235			1,374			661
Other expense, net	(241		)	(144		)	(433		)	(386		)
Income (loss) before income tax (provision) benefit	647			10,078			(16,973		)	19,688
Income tax benefit (provision)	1,531			(3,999		)	9,576			23,321
Net income (loss)	$	2,178		$	6,079		$	(7,397	)	$	43,009
Net income (loss) per share:
Basic	$	0.06		$	0.17		$	(0.20	)	$	1.22
Diluted	$	0.06		$	0.16		$	(0.20	)	$	1.15
Weighted average shares used in computing net income (loss) per share:
Basic	37,196			35,770			36,885			35,171
Diluted	39,574			38,113			36,885			37,341



	September 30, 2017			December 31, 2016
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	173,182		$	148,926
Short-term investments	91,380			109,238
Accounts receivable, net	71,741			75,522
Inventories, net	15,472			11,347
Prepaid expenses and other current assets	12,048			9,909
Total current assets	363,823			354,942
Property and equipment, net	20,735			11,809
Deferred tax assets, non-current	50,734			33,094
Other assets, non-current	1,103			1,154
TOTAL ASSETS	$	436,395		$	400,999
LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES:
Accounts payable	$	5,585		$	5,208
Accrued liabilities	26,897			34,649
Deferred revenue	69,960			68,997
Total current liabilities	102,442			108,854
Deferred revenue, non-current	32,126			28,785
Deferred and other tax liabilities, non-current	553			201
Other liabilities, non-current	933			499
TOTAL LIABILITIES	136,054			138,339
STOCKHOLDERS' EQUITY
Common stock	4			4
Additional paid-in-capital	298,400			256,774
Accumulated other comprehensive loss	(75		)	(17		)
Retained earnings (Accumulated deficit)	2,012			5,899
TOTAL STOCKHOLDERS' EQUITY	300,341			262,660
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$	436,395		$	400,999



	Three Months Ended							Nine Months Ended
	September 30, 2017			October 1, 2016				September 30, 2017			October 1, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$	2,178			$	6,079		$	(7,397	)		$	43,009
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	2,214				1,642			6,411				4,815
Stock-based compensation expense	10,973				10,104			39,991				28,884
Deferred and other income taxes	(1,790		)		(679		)	(10,147		)		(31,570		)
Other	6				54			148				366
Changes in operating assets and liabilities:
Accounts receivable	(8,221		)		(14,929		)	3,672				(11,567		)
Inventories	(1,336		)		(862		)	(4,761		)		(4,316		)
Prepaid expenses and other assets	78				(1,753		)	(1,944		)		(2,991		)
Accounts payable	1,757				569			532				54
Accrued liabilities and other liabilities	1,083				9,227			(9,308		)		3,470
Deferred revenue	5,413				3,290			4,304				1,015
Net cash provided by (used in) operating activities	12,355				12,742			21,501				31,169
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of short-term investments	(8,941		)		(20,942		)	(78,099		)		(84,773		)
Proceeds from maturities of short-term investments	25,300				24,500			96,012				85,747
Purchase of property and equipment	(6,977		)		(1,523		)	(12,179		)		(6,001		)
Net cash provided by (used in) investing activities	9,382				2,035			5,734				(5,027		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from employee stock purchase plan	4,487				3,417			9,443				6,785
Proceeds from exercise of stock options	40				5,528			983				9,654
Shares repurchased for tax withholdings on vesting of restricted stock units	(4,188		)		(3,411		)	(12,592		)		(7,240		)
Net cash provided by (used in) financing activities	339				5,534			(2,166		)		9,199
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	22,076				20,311			25,069				35,341
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period	151,919				135,242			148,926				120,212
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period	$	173,995			$	155,553		$	173,995			$	155,553



	Three Months Ended						Nine Months Ended
	September 30, 2017			October 1, 2016			September 30, 2017			October 1, 2016
Total Revenue	$	79,191		$	83,512		$	217,895			$	225,826
Reconciliation of GAAP Gross Profit and GAAP Gross Margin to Non-GAAP Gross Profit and Non-GAAP Gross Margin:
GAAP gross profit	64,741			69,174			176,817				184,850
Stock-based compensation expense	333			519			1,802				1,527
Stock-based compensation related payroll taxes	19			28			79				64
Non-GAAP gross profit	$	65,093		$	69,721		$	178,698			$	186,441
GAAP gross margin	82		%	83		%	81		%		82		%
Non-GAAP gross margin	82		%	83		%	82		%		83		%
Reconciliation of GAAP Operating Income (Loss) to Non-GAAP Operating Income:
GAAP operating income (loss)	$	347		$	9,987		$	(17,914	)		$	19,413
Stock-based compensation expense	10,973			10,104			39,991				28,884
Stock-based compensation related payroll taxes	199			414			1,036				971
Non-recurring items	2,305			—			2,891				—
Non-GAAP operating income	$	13,824		$	20,505		$	26,004			$	49,268
Reconciliation of GAAP Net Income (Loss) to Non-GAAP Net Income:
GAAP net income (loss)	$	2,178		$	6,079		$	(7,397	)		$	43,009
Stock-based compensation expense	10,973			10,104			39,991				28,884
Stock-based compensation related payroll taxes	199			414			1,036				971
Non-recurring items	2,305			—			2,891				—
Income tax effect of Non-GAAP adjustments	(6,189		)	(2,593		)	(18,468		)		(39,176		)
Non-GAAP net income	$	9,466		$	14,004		$	18,053			$	33,688



	Three Months Ended						Nine Months Ended
	September 30, 2017			October 1, 2016			September 30, 2017			October 1, 2016
Reconciliation of GAAP Diluted Net Income (Loss) per Share to Non-GAAP Diluted Net Income per Share:
GAAP diluted net income (loss) per share	$	0.06		$	0.16		$	(0.20	)	$	1.15
Stock-based compensation expense	0.27			0.27			1.08			0.77
Stock-based compensation related payroll taxes	0.01			0.01			0.03			0.03
Non-recurring items	0.06			—			0.08			—
Income tax effect of non-GAAP adjustments	(0.16		)	(0.07		)	(0.50		)	(1.05		)
Impact of difference in number of GAAP and non-GAAP diluted shares	(0.01		)	(0.01		)	(0.05		)	(0.01		)
Non-GAAP diluted net income per share	$	0.23		$	0.36		$	0.44		$	0.89
Reconciliation of GAAP Diluted Weighted-Average Number of Shares to Non-GAAP Diluted Weighted-Average Number of Shares:
GAAP diluted weighted-average number of shares	39,574			38,113			36,885			37,341
Dilutive impact due to stock-based compensation	1,546			544			3,827			673
Non-GAAP diluted weighted-average number of shares	41,120			38,657			40,712			38,014



INVESTOR CONTACT:
Jennifer Gianola
+1 (408) 831-4452
jennifer.gianola@gigamon.com


•	Revenue of $79.2 million, compared to $83.5 million in the third quarter of fiscal 2016.


•	GAAP gross margin was 82%, compared to 83% in the third quarter of fiscal 2016.


•	Non-GAAP gross margin was 82%, compared to 83% in the third quarter of fiscal 2016.


•	GAAP net income was $2.2 million, or $0.06 per basic and diluted share, compared to GAAP net income of $6.1 million, or $0.16 per diluted share, in the third quarter of fiscal 2016.


•	Non-GAAP net income was $9.5 million or $0.23 per diluted share, compared to non-GAAP net income of $14.0 million, or $0.36 per diluted share, in the third quarter of fiscal 2016.


•	Cash and short-term investments were $264.6 million, up $6 million from the second quarter of 2017 and up $20 million from the third quarter of fiscal 2016.