Exhibit 99.1

ARRIS ANNOUNCES PRELIMINARY AND UNAUDITED

FIRST QUARTER 2013 RESULTS

Suwanee, Ga. (April 24, 2013) ARRIS Group, Inc. (NASDAQ:ARRS), today announced preliminary and unaudited financial results for the first quarter 2013.

Revenues in the first quarter 2013 reflect a $13.2 million reduction related to Comcast’s investment in ARRIS associated with the Company’s acquisition of Motorola Home, which closed on April 17, 2013. Prior to the adjustment, revenues were $366.8 million. Including the adjustment, revenues were $353.7 million as compared to first quarter 2012 revenues of $302.9 million and as compared to fourth quarter 2012 revenues of $344.0 million.

Adjusted net income (a non-GAAP measure) in the first quarter 2013 was $0.25 per diluted share, compared to $0.19 per diluted share for the first quarter 2012 and $0.28 per diluted share for the fourth quarter 2012. GAAP net loss in the first quarter 2013 was $(0.13) per diluted share, as compared to first quarter 2012 GAAP net income of $0.05 per diluted share and fourth quarter 2012 GAAP net income of $0.13 per diluted share. A reconciliation of adjusted net income to GAAP net income per diluted share is attached to this release and also can be found on the Company’s website (www.arrisi.com).

Excluding the reduction of revenue and a corresponding reduction in gross profit related to the investment in ARRIS by Comcast, gross margin for the first quarter 2013 was 33.2%. Gross margin including the adjustments for the first quarter 2013 was 30.7%. The Company ended the first quarter of 2013 with $631.3 million of cash resources, which included $608.4 million of cash, cash equivalents and short-term investments, and $22.9 million of long-term marketable security investments, as compared to $584.0 million, in the aggregate, at the end of the fourth quarter of 2012. The Company generated $50.1 million of cash from operating activities during the first quarter 2013, which compares to $35.3 million generated in the first quarter 2012.

Order backlog at the end of the first quarter 2013 was $282.1 million as compared to $277.7 million and $222.6 million at the end of the first quarter 2012 and the fourth quarter 2012, respectively. The Company’s book-to-bill ratio in the first quarter 2013 was 1.17 as compared to the first quarter 2012 of 1.43 and the fourth quarter 2012 of 1.11.

“Our record first quarter revenues reflect the culmination of a decade of growth during which ARRIS revenues have tripled. I am looking forward to continued

growth now that we have closed our acquisition of Motorola Home. We welcome all of our new employees to the ARRIS team. The combination will be very powerful for our customers and shareholders,” said Bob Stanzione, ARRIS Chairman and CEO.

“We are off to a good start to the year with sales and adjusted net income per share in the upper half of our guidance. As previously disclosed, the investment in ARRIS by Comcast in conjunction with the acquisition of the Motorola Home business resulted in fair value impacts on the balance sheet and income statement; $13.2 million was recorded as a reduction in revenue and gross margin, and $19.3 million was recorded as other expense in the first quarter 2013. An explanation of the accounting for these impacts is attached to the press release,” said David Potts, ARRIS EVP & CFO. “With the closure of our Motorola Home acquisition last week, we are now in the midst of reviewing our outlook for the second quarter and the balance of 2013. We plan on providing an update in the near future.”

ARRIS management will conduct a conference call at 5:00 pm EDT, today, Wednesday, April 24, 2013, to discuss these results in detail. You may participate in this conference call by dialing (888) 680-0892 or (617) 213-4858 for international calls prior to the start of the call and providing the ARRIS Group, Inc. name, conference pass code 78256359, and Bob Puccini as the moderator. Please note that ARRIS will not accept any calls related to this earnings release until after the conclusion of the conference call. A replay of the conference call can be accessed approximately two hours after the call through May 1, 2013 by dialing (888) 286-8010 or (617) 801-6888 and using the pass code 35756915. Live internet access to the call will be available through the Investor Relations section of the Company’s website at www.arrisi.com. A replay will also be made available for a period of 12 months following the conference call on ARRIS’ website at www.arrisi.com.

About ARRIS

ARRIS is a premier video and broadband technology company that transforms how service providers worldwide deliver entertainment and communications without boundaries. Its powerful end-to-end platforms enable service and content providers to improve the way people connect – with each other and with their favorite content. The Company’s vision and expertise continue to drive the industry’s innovations, as they have for more than 60 years. Headquartered north of Atlanta, in Suwanee, Georgia, ARRIS has R&D, sales and support centers throughout the world. Information about ARRIS products and services can be found at www.arrisi.com.

Forward-looking statements:

Statements made in this press release and in the related conference call, including those related to:

are forward-looking statements. These statements involve risks and uncertainties that may cause actual results to differ materially from those set forth in these statements. Among other things,

In addition to the factors set forth elsewhere in this release, other factors that could cause results to differ from current expectations include: the current volatility in the capital markets, the potential impact on the business of the Motorola Home acquisition, the retention of employees and the ability of ARRIS to successfully integrate Motorola Home’s business opportunities, technology, personnel and operations; its impact on our customers’ plans and access to capital; the impact of rapidly changing technologies; the impact of competition on product development and pricing; the ability of ARRIS to react to changes in general industry and market conditions including regulatory developments; rights to intellectual property, market trends and the adoption of industry standards; and consolidations within the telecommunications industry of both the customer and supplier base. These factors are not intended to be an all-encompassing list of risks and uncertainties that may affect the Company’s business. Additional information regarding these and other factors can be found in ARRIS’ reports filed with the Securities and Exchange Commission, including its Form 10-K for the year ended December 31, 2012. In providing forward-looking statements, the Company expressly disclaims any obligation to update publicly or otherwise these statements, whether as a result of new information, future events or otherwise.

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ARRIS GROUP, INC.

PRELIMINARY CONSOLIDATED BALANCE SHEETS

(in thousands)

(unaudited)

ARRIS GROUP, INC.

PRELIMINARY CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)

(unaudited)

ARRIS GROUP, INC.

PRELIMINARY CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(unaudited)

ARRIS GROUP, INC.

PRELIMINARY SUPPLEMENTAL SALES & NET INCOME RECONCILIATION

(in thousands, except per share data) (unaudited)

See Notes to GAAP and Adjust Non-GAAP Financial Measures

ARRIS GROUP, INC.

PRELIMINARY SUPPLEMENTAL RECONCILIATION

ADJUSTMENTS RELATED TO COMCAST’S INVESTMENT IN ARRIS

(unaudited)

Notes to GAAP to Adjusted Non-GAAP Financial Measures

The Company reports its financial results in accordance with accounting principles generally accepted in the United States (“GAAP” or referred to herein as “reported”). However, management believes that certain non-GAAP financial measures provide management and other users with additional meaningful financial information that should be considered when assessing our ongoing performance. Our management regularly uses our supplemental non-GAAP financial measures internally to understand, manage and evaluate our business and make operating decisions. These non-GAAP measures are among the factors management uses in planning for and forecasting future periods. Non-GAAP financial measures should be viewed in addition to, and not as an alternative to, the Company’s reported results prepared in accordance with GAAP. Our non-GAAP financial measures reflect adjustments based on the following items, as well as the related income tax effects:

Acquisition Accounting Impacts Related to Deferred Revenue: In connection with our acquisition of BigBand, business combination rules require us to account for the fair values of arrangements for which acceptance has not been obtained, and post contract support in our purchase accounting. The non-GAAP adjustment to our sales and cost of sales is intended to include the full amounts of such revenues. We believe the adjustment to these revenues is useful as a measure of the ongoing performance of our business. We have historically experienced high renewal rates related to our support agreements and our objective is to increase the renewal rates on acquired post contract support agreements; however, we cannot be certain that our customers will renew our contracts.

Reduction in revenue related to Comcast of Investment in ARRIS: In connection with our acquisition of Motorola Home, Comcast was given an opportunity to invest in ARRIS. The accounting guidance requires that we record the implied fair value of benefit received by Comcast as a reduction in revenue. Until the closing of the deal, changes in the value of the investment will be marked to market and flow through other expense (income). We have excluded the effect of the implied fair value in calculating our non-GAAP financial measures. We believe it is useful to understand the effects of these items on our total revenues and other expense (income).

Stock-Based Compensation Expense: We have excluded the effect of stock-based compensation expenses in calculating our non-GAAP operating expenses and net income measures. Although stock-based compensation is a key incentive offered to our employees, we continue to evaluate our business performance excluding stock-based compensation expenses. We record non-cash compensation expense related to grants of options and restricted stock. Depending upon the size, timing and the terms of the grants, the non-cash compensation expense may vary significantly but will recur in future periods.

Acquisition Costs: We have excluded the effect of acquisition related and other expenses and the effect of restructuring expenses in calculating our non-GAAP operating expenses and net income measures. We incurred significant expenses in connection with our recent acquisition of BigBand, which we generally would not have otherwise incurred in the periods presented as part of our continuing operations. Acquisition related expenses consist of transaction costs, costs for transitional employees, other acquired employee related costs, and integration related outside services. We believe it is useful to understand the effects of these items on our total operating expenses.

Restructuring Costs: We have excluded the effect of restructuring charges in calculating our non-GAAP operating expenses and net income measures. Restructuring expenses consist of employee severance, abandoned facilities, and other exit costs. We believe it is useful to understand the effects of these items on our total operating expenses.

Loss on Sale of Product Line: We have excluded the effect of a loss on the sale of a product line in calculating our non-GAAP operating expenses and net income measures. We believe it is useful to understand the effects of these items on our total operating expenses.

Amortization of Intangible Assets: We have excluded the effect of amortization of intangible assets in calculating our non-GAAP operating expenses and net income measures. Amortization of intangible assets is non-cash, and is inconsistent in amount and frequency and is significantly affected by the timing and size of our acquisitions. Investors should note that the use of intangible assets contributed to our revenues earned during the periods presented and will contribute to our future period revenues as well. Amortization of intangible assets will recur in future periods.

Settlement Charge - Pension: In an effort to reduce volatility and administrative expense in connection with the Company’s pension plan, we have offered certain participants an opportunity to voluntarily elect an early payout of their pension benefits. We exclude this charge in Non-GAAP measures, as this is a one-time charge that is not considered by management in their review of financial results.

Non-Cash Interest on Convertible Debt: We have excluded the effect of non-cash interest in calculating our non-GAAP operating expenses and net income measures. We record the accretion of the debt discount related to the equity component non-cash interest expense. We believe it is useful to understand the component of interest expense that will not be paid out in cash.

Impairment of Investment: We have excluded the effect of an other-than-temporary impairment of a cost method investment in calculating our non-GAAP financial measures. We believe it is useful to understand the effect of this non-cash item in our other expense (income).

Credit Facility - Ticking Fees: In connection with our acquisition of Motorola Home, the cash portion of the consideration is funded through debt financing commitments. A ticking fee is a fee paid to our banks to compensate for the time lag between the commitment allocation on a loan and the actual funding. We have excluded the effect of the ticking fee in calculating our non-GAAP financial measures. We believe it is useful to understand the effect of this non-cash item in our other expense (income).

Mark To Market Fair Value Adjustment Related To Comcast Investment in ARRIS: In connection with our acquisition of Motorola Home, Comcast was given an opportunity to invest in ARRIS. The accounting guidance requires we mark to market the changes in the value of the investment and flow through other expense (income). We have excluded the effect of the implied fair value in calculating our non-GAAP financial measures. We believe it is useful to understand the effects of these items on our total other expense (income).

Income Tax Expense (Benefit): We have excluded the tax effect of the non-GAAP items mentioned above. Additionally, we have excluded the effects of certain tax adjustments related to state valuation allowances, research and development tax credits and provision to return differences.