Business and Financial Highlights:

• Generated quarterly revenue of $72.9 million
• Signed patent and technology license agreements with IBM
• Received Best IoT Innovation Award for Lensless Smart Sensor
• GAAP diluted net income per share of $0.08; non-GAAP diluted net income per share of $0.14

SUNNYVALE, Calif. — (BUSINESS WIRE) — April 20, 2015 — Rambus Inc. (NASDAQ: RMBS), the innovative technology solutions company that brings invention to market, today reported financial results for the first quarter ended March 31, 2015.

GAAP Financial Results:

Revenue for the first quarter of 2015 was $72.9 million, up 1% on a sequential basis from the fourth quarter of 2014 primarily due to a new license agreement signed with IBM during the first quarter of 2015 and higher royalty revenue from other customers. As compared to the first quarter of 2014, revenue was down 7% primarily due to lower royalty revenue, offset by higher revenue from a new license agreement signed with IBM.

Total operating costs and expenses for the first quarter of 2015 were $55.0 million, 1% higher than the previous quarter and flat as compared to the first quarter of 2014. First quarter operating costs and expenses of $55.0 million included $3.8 million of stock-based compensation expenses and $6.3 million of amortization expenses. In comparison, total operating costs and expenses for the fourth quarter of 2014 of $54.5 million included $3.5 million of stock-based compensation expenses and $6.3 million of amortization expenses. Total operating costs and expenses for the first quarter of 2014 were $55.1 million, which included $2.9 million of stock-based compensation expenses, $6.8 million of amortization expenses and $1.4 million of retention bonuses from acquisitions. The change in total operating costs and expenses in the first quarter of 2015 as compared to the fourth quarter of 2014 was primarily due to lower gain from sale of intellectual property and higher headcount related costs partially offset by lower prototyping and consulting costs. The change in total operating costs and expenses in the first quarter of 2015 as compared to the first quarter of 2014 was primarily attributable to the higher gain from sale of intellectual property and lower retention bonus expense from acquisitions partially offset by higher headcount related costs and expenses related to software design tools.

Net income for the first quarter of 2015 was $9.5 million as compared to net income of $7.8 million in the fourth quarter of 2014 and net income of $7.8 million in the first quarter of 2014. Diluted net income per share for the first quarter of 2015 was $0.08 as compared to diluted net income per share of $0.07 in the fourth quarter of 2014 and first quarter of 2014, respectively.

Non-GAAP Financial Results (1):

Total non-GAAP operating costs and expenses in the first quarter of 2015 were $44.9 million, 1% higher than the previous quarter, and 2% higher than the first quarter of 2014.

Non-GAAP net income in the first quarter of 2015 was $17.0 million, 2% higher than the prior quarter and 13% lower than the first quarter of 2014. Non-GAAP diluted net income per share was $0.14 in the first quarter of 2015 as compared to $0.14 in the prior quarter and $0.17 in the first quarter of 2014.

Other Financial Highlights:

Cash, cash equivalents, and marketable securities as of March 31, 2015 were $317.8 million, an increase of $17.7 million from December 31, 2014.

During the first quarter of 2015, the Company recorded an income tax provision of approximately $5.4 million. As the Company continues to maintain a full valuation allowance against its U.S. deferred tax assets, the Company’s tax provision consists of primarily foreign withholding taxes.

Second Quarter 2015 Outlook:

For the second quarter of 2015, the Company expects revenue to be between $70 million and $74 million. Revenue is not without risk and includes expectations that the Company will sign new customers for patent as well as solutions licensing.

Conference Call:

The Company will host a conference call at 2:00 p.m. PT today to discuss its financial results. The call, audio and slides will be available online at investor.rambus.com. A replay will be available following the call as a webcast on the Rambus Investor Relations website and for one week at the following numbers: (855) 859-2056 (domestic) or (404) 537-3406 (international) with ID#23044511.

(1) Non-GAAP Financial Information:

In the commentary set forth above and in the financial statements included in this earnings release, the Company presents the following non-GAAP financial measures: operating costs and expenses, operating income (loss) and net income (loss). In computing each of these non-GAAP financial measures, the following items were considered as discussed below: stock-based compensation expenses, acquisition-related transaction costs and retention bonus expense, amortization expenses, restructuring charges, non-cash interest expense and certain other one-time adjustments. The non-GAAP financial measures disclosed by the Company should not be considered a substitute for, or superior to, financial measures calculated in accordance with GAAP, and the financial results calculated in accordance with GAAP and reconciliations from these results should be carefully evaluated. Management believes the non-GAAP financial measures are appropriate for both its own assessment of, and to show investors, how the Company’s performance compares to other periods. The non-GAAP financial measures used by the Company may be calculated differently from, and therefore may not be comparable to, similarly titled measures used by other companies. Reconciliation from GAAP to non-GAAP results is included in the financial statements contained in this release.