Exhibit 99.1

SUNNYVALE, Calif. and YOKNEAM, ISRAEL — May 1, 2015 — Mellanox® Technologies, Ltd. (NASDAQ: MLNX)

On April 27, 2015, a private company in which Mellanox Technologies, Ltd. (the “Company”) made an equity investment informed the Company of its intent to discontinue operations. The investment is accounted for at cost in the Company’s financial statements. As a result of this new information, the Company recognized an impairment loss of $3.2 million from the investment, resulting in a decrease to its previously reported first quarter 2015 GAAP net income and earnings per share reported in the Company’s April 21, 2015 press release, which was furnished to the SEC on form 8-K on April 21, 2015.  The non-GAAP net income and earnings per share for the first quarter of 2015 were unchanged.

GAAP to Non-GAAP Reconciliation

To supplement our consolidated financial statements presented in accordance with generally accepted accounting principles (GAAP), Mellanox uses non-GAAP measures of net income which are adjusted from results based on GAAP to exclude share-based compensation expense, amortization expense of acquired intangible assets, acquisition related expense, settlement costs, changes related to recognition of deferred tax valuation allowance and impairment loss on equity investments in private companies. The company believes the non-GAAP results provide useful information to both management and investors as these non-GAAP results exclude expenses that are not indicative of our core operating results. Management believes it is useful to exclude share-based compensation expense, amortization expense of acquired intangible assets, acquisition related expense, settlement costs, changes related to recognition of deferred tax valuation allowance and impairment loss on equity investments in private companies because it enhances investors’ ability to understand our business from the same perspective as management, which believes that such items are not directly attributable to nor reflective of the underlying performance of the company’s business operations. Further, management believes certain non-cash charges such as share-based compensation, amortization of acquired intangible assets, changes related to recognition of deferred tax valuation allowance and impairment charges do not reflect the cash operating results of the business. These measures should be considered in addition to results prepared in accordance with GAAP, but should not be considered a substitute for or superior to GAAP results. These non-GAAP measures may be different than the non-GAAP measures used by other companies. A reconciliation of GAAP to non-GAAP condensed consolidated statements of operations is presented in the financial statements portion of this release and is posted under the “Investor Relations” section on our website.

Mellanox Technologies, Ltd.

Reconciliation of Non-GAAP Adjustments

(in thousands, except percentages, unaudited)

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Mellanox Technologies, Ltd.

Reconciliation of Non-GAAP Adjustments

(in thousands, except per share data, unaudited)

* This adjustment adds back the GAAP effect of additional ordinary shares that would have been outstanding if the dilutive potential ordinary shares from stock options had been issued under the Treasury method.

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