Exhibit 99.1

Contact:

Justin Spencer

Chief Financial Officer

+1-408-428-7801

jspencer@symmetricom.com

Symmetricom Reports Third Quarter

Fiscal Year 2013 Financial Results

• Net revenue of $53.3 million

• Net income of $0.8 million, or $0.02 per share

• Non-GAAP net income of $2.8 million, or $0.07 per share

• Gross margin of 45.1%; up on a year-over-year and sequential basis and the highest level since the first quarter of fiscal 2012

SAN JOSE, Calif. — April 24, 2013 — Symmetricom, Inc. (NASDAQ:SYMM), a worldwide leader in precision time and frequency technologies, today reported financial results for its third quarter of fiscal year 2013 ended March 31, 2013.

Net revenue for the third quarter of fiscal 2013 was $53.3 million, compared to the $60.4 million reported for the third quarter of fiscal 2012. Symmetricom reported net income of $0.8 million, or $0.02 per share, for the third quarter of fiscal 2013, compared to net income of $2.2 million, or $0.05 per share in the third quarter of fiscal 2012. On a sequential basis, revenue, net income and earnings per share increased from the second quarter of fiscal 2013.

Non-GAAP net income for the third quarter of fiscal 2013 was $2.8 million, or $0.07 per share, compared to $3.3 million, or $0.08 per share, reported for the third quarter of fiscal 2012. Non-GAAP net income increased sequentially by $2.5 million, or $0.06 per share, from the second quarter of fiscal 2013.

Cash, cash equivalents and short-term investments totaled $69.7 million as of March 31, 2013 compared to $70.8 million reported as of December 30, 2012. Net cash provided by operating activities in the third quarter was $1.3 million, and property, plant and equipment purchases were approximately $2.1 million, resulting in free cash outflow of ($0.8) million.

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Symmetricom Reports Third Quarter Fiscal Year 2013 Financial Results

April 24, 2013

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“Symmetricom delivered improved results compared to last quarter, with revenue at the high end of our expectations. Profitability also improved sequentially, reflecting higher revenue, improved CSAC margins and the benefits from our ongoing savings efforts,” said Dave Côté, president and chief executive officer of Symmetricom. “We continue to focus on driving our key growth initiatives, including the Quantum Chip Scale Atomic Clock, PackeTime and Government Programs. With our solid competitive position, a suite of leading solutions, and a healthy balance sheet, we remain well-positioned for the future.”

Business Segment Revenue Results

Revenue in the Communications Business in the third quarter of fiscal 2013 was $30.0 million, compared to $32.6 million reported in the third quarter of fiscal 2012. Revenue in the Government and Enterprise Business in the third quarter of fiscal 2013 was $23.3 million, compared to $27.8 million reported in the third quarter of fiscal 2012. Revenue in both segments increased from the second quarter of fiscal 2013, with the larger increase in the Communications segment.

Fourth Quarter 2013 Guidance

Symmetricom’s guidance for the fourth quarter of fiscal 2013 is as follows:

• Net revenue is expected to be in the range of $51 million to $57 million

• GAAP earnings (loss) per share is expected to be in the range of $0.00 to $0.05

• Non-GAAP earnings per share is expected to be in the range of $0.05 to $0.10

A reconciliation of GAAP and non-GAAP guidance is provided at the end of this press release.

Investor Conference Call

As previously announced, management will hold a conference call to discuss these results today, at 1:30 p.m. Pacific Time. Investors are invited to join the conference call by dialing +1-212-547-0198 and referencing “Symmetricom.” A live webcast will also be available on the investor relations section of the Company’s website at www.symmetricom.com. An audio replay will be available for one week and can be accessed by dialing +1-203-369-2034.

About Symmetricom, Inc.

Symmetricom (NASDAQ:SYMM), a world leader in precise time solutions, sets the world’s standard for time. The Company generates, distributes and applies precise time for the communications, aerospace/defense, IT infrastructure and metrology industries. Symmetricom’s customers, from communications service providers and network equipment manufacturers to governments and their suppliers worldwide, are able to build more reliable networks and systems by using the Company’s advanced timing technologies, atomic clocks, services and solutions. All products support today’s precise timing standards, including GPS-based timing, IEEE 1588 (PTP), Network Time Protocol (NTP), Synchronous Ethernet and DOCSIS^® timing. Symmetricom is based in San Jose, California, with offices worldwide. For more information, visit: http://www.symmetricom.com or join the dialogue at http://www.twitter.com/symmetricom.

Non-GAAP Information

Certain non-GAAP financial information is included in this press release. In the reconciliation of GAAP to non-GAAP results, Symmetricom excludes certain items related to non-cash equity-based compensation, acquisition-related costs, amortization of intangible assets, restructuring charges and off-

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Symmetricom Reports Third Quarter Fiscal Year 2013 Financial Results

April 24, 2013

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shore development transition costs that the Company does not consider indicative of its ongoing performance. The income tax effect after these non-GAAP adjustments is determined based upon Symmetricom’s estimate of its annual non-GAAP effective tax rate excluding these non-GAAP adjustments. Symmetricom believes that excluding such items provides investors, analysts and management with a representation of the Company’s core operating performance and with information useful in assessing, in conjunction with GAAP results, underlying trends in operating performance. Management uses such non-GAAP information to evaluate financial results and to establish operational goals. Non-GAAP information should not be considered superior to or as a substitute for data prepared in accordance with GAAP. A reconciliation of the non-GAAP results to the GAAP results is provided in the financial schedules portion of this press release.

Free cash flow is defined as net cash provided by or used in operating activities minus purchases of property, plant and equipment. Symmetricom believes this metric provides useful information to its investors, analysts, and management about the level of cash generated by or used in normal business operations, including the use of cash for the purchase of property, plant and equipment. Management also views it as a measure of cash available to pay debt and return cash to stockholders. Free cash flow is not a GAAP financial measure and should not be considered superior to or a substitute for operating cash flow or other cash flow data prepared in accordance with GAAP.

Safe Harbor

This press release contains forward-looking information 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, and is subject to the safe harbor created by those sections. These forward-looking statements include statements concerning fourth quarter fiscal 2013 guidance and future performance as well as the information regarding the usefulness of the non-GAAP financial information. The statements in this press release are made as of the date of this press release, even if subsequently made available by Symmetricom on its website or otherwise. Symmetricom expressly disclaims any obligation to update or revise any forward-looking statement contained herein, whether as a result of a change in its expectations, a change in any events, conditions or circumstances on which a forward-looking statement is based, or otherwise. Symmetricom’s actual results could differ materially from those projected or suggested in these forward-looking statements. Factors that could cause future actual results to differ materially from the results projected in or suggested by such forward-looking statements include, but are not limited to, the extent and magnitude of customer orders received and shipped within the same quarter, risks relating to general economic conditions in the markets we address and the telecommunications and government markets in general, risks related to the development of our new products and services, reliance on our contract manufacturer, the effects of increasing competition and competitive pricing pressure, uncertainties associated with changing intellectual property laws or misappropriation of intellectual property, developments in and expenses related to litigation, the inability to obtain sufficient amounts of key components, the rescheduling or cancellation of key customer orders, the loss of a key customer, the effects of new and emerging technologies, the risk that excess inventory may result in write-offs, price erosion and decreased demand, fluctuations in the rate of exchange of foreign currency, changes in our effective tax rate, market acceptance of our new products and services, technological advancements, undetected errors, design flaws, defects in our products or start-up manufacturing difficulties, the risks associated with our international sales, potential short-term investment losses and other risks due to credit market dislocation, geopolitical risks and risk of terrorist activities, the risks associated with attempting to integrate other companies and businesses we acquire, and the risk factors listed from time to time in Symmetricom’s reports filed with the Securities and Exchange Commission, including the annual report on Form 10-K for the fiscal year ended July 1, 2012 and subsequent Forms 10-Q and 8-K.

SYMM-F

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Symmetricom Reports Third Quarter Fiscal Year 2013 Financial Results

April 24, 2013

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SYMMETRICOM, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share amounts)

(unaudited)

	Three months ended									Nine months ended
	March 31, 2013			December 30, 2012			April 1, 2012			March 31, 2013			April 1, 2012
Net revenue	$	53,349		$	49,151		$	60,438		$	158,891		$	175,110
Cost of sales:
Cost of products and services		28,654			27,861			35,638			88,415			97,693
Acquisition-related costs		237			248			74			719			445
Restructuring charges		375			41			65			371			1,156
Total cost of sales		29,266			28,150			35,777			89,505			99,294
Gross profit		24,083			21,001			24,661			69,386			75,816
Gross margin		45.1	%		42.7	%		40.8	%		43.7	%		43.3	%
Operating expenses:
Research and development		8,291			7,805			7,129			24,409			20,575
Selling, general and administrative		14,593			14,778			14,281			45,598			43,955
Amortization of intangible assets		87			86			52			259			156
Restructuring charges		947			1,146			(76	)		2,148			123
Total operating expenses		23,918			23,815			21,386			72,414			64,809
Operating income (loss)		165			(2,814	)		3,275			(3,028	)		11,007
Interest income, net of amortization (accretion) of premium (discount) on investments		98			178			225			240			(5	)
Income (loss) before taxes		263			(2,636	)		3,500			(2,788	)		11,002
Income tax provision (benefit)		(556	)		(861	)		1,296			(1,629	)		3,604
Net income (loss)	$	819		$	(1,775	)	$	2,204		$	(1,159	)	$	7,398
Earnings (loss) per share:
Basic	$	0.02		$	(0.04	)	$	0.05		$	(0.03	)	$	0.18
Diluted	$	0.02		$	(0.04	)	$	0.05		$	(0.03	)	$	0.17
Shares used in computing earnings (loss) per share:
Weighted average shares outstanding - basic		40,502			40,356			41,795			40,456			42,258
Weighted average shares outstanding - diluted		40,956			40,356			42,615			40,456			42,937

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Symmetricom Reports Third Quarter Fiscal Year 2013 Financial Results

April 24, 2013

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SYMMETRICOM, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands)

(unaudited)

	March 31, 2013			July 1, 2012
ASSETS
Current assets:
Cash and cash equivalents	$	22,371		$	27,659
Short-term investments		47,351			39,280
Accounts receivable, net		38,870			45,952
Inventories		47,195			47,618
Prepaids and other current assets		17,379			16,943
Total current assets		173,166			177,452
Property, plant and equipment, net		23,148			22,702
Intangible assets, net		3,519			3,458
Deferred taxes and other assets		28,898			27,413
Total assets	$	228,731		$	231,025
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	10,343		$	9,300
Accrued compensation		11,923			14,574
Accrued warranty		1,455			1,722
Other accrued liabilities		10,748			11,841
Total current liabilities		34,469			37,437
Long-term obligations		4,938			5,472
Deferred income taxes		334			334
Total liabilities		39,741			43,243
Stockholders’ equity:
Common stock		195,821			193,478
Accumulated other comprehensive loss		(208	)		(232	)
Accumulated deficit		(6,623	)		(5,464	)
Total stockholders’ equity		188,990			187,782
Total liabilities and stockholders’ equity	$	228,731		$	231,025

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Symmetricom Reports Third Quarter Fiscal Year 2013 Financial Results

April 24, 2013

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SYMMETRICOM, INC.

RECONCILIATION OF GAAP TO NON-GAAP RESULTS

(In thousands, except per share amounts)

(unaudited)

	Three months ended									Nine months ended
	March 31, 2013			December 30, 2012			April 1, 2012			March 31, 2013			April 1, 2012
Reconciliation from GAAP to Non-GAAP
GAAP Net income (loss)	$	819		$	(1,775	)	$	2,204		$	(1,159	)	$	7,398
Non-GAAP adjustments:
Equity-based compensation expense:
Cost of products and services		274			250			272			815			606
Research and development		304			316			312			981			896
Selling, general and administrative		1,212			1,121			1,154			3,453			3,079
Total equity-based compensation expense		1,790			1,687			1,738			5,249			4,581
Acquisition-related costs and amortization of intangible assets:
Cost of products and services		237			248			74			719			445
Operating expenses		87			86			52			259			156
Total acquisition-related costs and amortization of intangible assets		324			334			126			978			601
Restructuring charges	$	1,322		$	1,187		$	(11	)	$	2,519		$	1,279
Off-shore development transition costs		—			—			—			729			—
Income tax effect of Non-GAAP adjustments		(1,429	)		(1,154	)		(793	)		(3,653	)		(2,263	)
Non-GAAP Net income	$	2,826		$	279		$	3,264		$	4,663		$	11,596
Earnings (loss) per share - diluted:
GAAP Net income (loss)	$	0.02		$	(0.04	)	$	0.05		$	(0.03	)	$	0.17
Non-GAAP Net income	$	0.07		$	0.01		$	0.08		$	0.11		$	0.27
Weighted average shares outstanding - diluted		40,956			41,464			42,615			41,396			42,937

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Symmetricom Reports Third Quarter Fiscal Year 2013 Financial Results

April 24, 2013

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SYMMETRICOM, INC.

RECONCILIATION OF GAAP TO NON-GAAP RESULTS

(In thousands, except per share amounts)

(unaudited)

		Three months ended									Nine months ended
		March 31, 2013			December 30, 2012			April 1, 2012			March 31, 2013			April 1, 2012
GAAP Revenue		$	53,349		$	49,151		$	60,438		$	158,891		$	175,110
Reconciliation from GAAP to Non-GAAP Gross Profit:
GAAP Gross profit	(A)	$	24,083		$	21,001		$	24,661		$	69,386		$	75,816
GAAP Gross margin			45.1	%		42.7	%		40.8	%		43.7	%		43.3	%
Non-GAAP adjustments:
Equity-based compensation expense			274			250			272			815			606
Acquisition-related costs			237			248			74			719			445
Restructuring charges			375			41			65			371			1,156
Non-GAAP Gross profit	(B)	$	24,969		$	21,540		$	25,072		$	71,291		$	78,023
Non-GAAP Gross margin			46.8	%		43.8	%		41.5	%		44.9	%		44.6	%
Reconciliation from GAAP to Non-GAAP Operating Expense:
GAAP Operating expenses	(C)	$	23,918		$	23,815		$	21,386		$	72,414		$	64,809
Operating expense % to revenue			44.8	%		48.5	%		35.4	%		45.6	%		37.0	%
Non-GAAP adjustments:
Equity-based compensation expense			(1,516	)		(1,437	)		(1,466	)		(4,434	)		(3,975	)
Amortization of intangible assets			(87	)		(86	)		(52	)		(259	)		(156	)
Restructuring charges			(947	)		(1,146	)		76			(2,148	)		(123	)
Off-shore development transition costs			—			—			—			729			—
Non-GAAP operating expenses	(D)	$	21,368		$	21,146		$	19,944		$	66,302		$	60,555
Non-GAAP operating expenses % to revenue			40.1	%		43.0	%		33.0	%		41.7	%		34.6	%
Reconciliation from GAAP to Non-GAAP Operating Income (loss):
GAAP Operating income (loss)	(A) -(C)	$	165		$	(2,814	)	$	3,275		$	(3,028	)	$	11,007
Operating income % to revenue			0.3	%		-5.7	%		5.4	%		-1.9	%		6.3	%
Non-GAAP Operating income	(B) -(D)	$	3,601		$	394		$	5,128		$	4,989		$	17,468
Operating income % to revenue			6.7	%		0.8	%		8.5	%		3.1	%		10.0	%

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Symmetricom Reports Third Quarter Fiscal Year 2013 Financial Results

April 24, 2013

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SYMMETRICOM, INC.

RECONCILIATION OF FORWARD-LOOKING GUIDANCE FOR NON-GAAP FINANCIAL MEASURES

TO PROJECTED GAAP REVENUE AND EPS

(In thousands, except per share amounts)

(Unaudited)

	Three Months Ending June 30, 2013
	Revenue				Earnings / (Loss) Per  Share from Continuing Operations
	From		To		From			To
GAAP Guidance	$	51,000	$	57,000	$	0.00		$	0.05
Estimated Non-GAAP Adjustments
Equity-based compensation expense					$	0.04		$	0.04
Amortization of intangible assets					$	0.01		$	0.01
Integration and restructuring charges					$	0.02		$	0.02
Income tax effect of non-GAAP adjustments					($	0.02	)	($	0.02	)
Total Non-GAAP Adjustments					$	0.05		$	0.05
Non-GAAP Guidance	$	51,000	$	57,000	$	0.05		$	0.10

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