Sep. 10, 2009 (GlobeNewswire) -- performance by adjusting for special, non-recurring items that may
obscure results and trends in our core operating performance,
particularly in reconciling differences between reported income and
actual cash flows;

* it can provide consistency in reviewing Volterra's historical
performance between periods, as well as allowing for better
comparisons of Volterra's performance with similar companies in
Volterra's industry;

* it allows users to evaluate the results of the business using the
same financial measures that management uses to evaluate and manage
Volterra's internal planning, budgeting and operations; and

* it provides investors with additional information used by
management, its board of directors and committees thereof, to
determine management compensation.

Volterra's management reports and uses calculations of (i) non-GAAP gross margin and non-GAAP gross margin as a percent of revenue, which represents gross margin excluding the effect of stock-based compensation; (ii) non-GAAP income from operations (and its components, non-GAAP research and development expense, non-GAAP selling, general, and administrative expense, non-GAAP total operating expenses, and including non-GAAP gross margin as indicated above) as well as non-GAAP operating margin as a percent of revenue which represent income from operations and its components excluding the effect of stock-based compensation and special items such as restructuring charges, net of tax; (iii) non-GAAP annual effective tax rate and the associated non-GAAP income tax expense, which represents the effective tax rate without the effect of stock-based compensation and income tax expense recalculated excluding the effect of stock-based compensation and special items on non-GAAP income before tax; and (iv) non-GAAP net income (and its components listed above), non-GAAP net margin as a percent of revenue, and non-GAAP diluted net income per share, which represents net income and diluted net income per share excluding the effect of stock-based compensation expense and special items such as the cumulative effect of accounting changes and restructuring charges, net of tax.

Investors should note that the non-GAAP financial measures used by Volterra may not be the same non-GAAP financial measures, and may not be calculated in the same manner, as that of other companies. Whenever Volterra discloses such a non-GAAP financial measure, it provides a reconciliation of non-GAAP financial measures to what it believes to be the most closely applicable GAAP financial measure. A reconciliation of GAAP net income to non-GAAP net income is included in the financial statements portion of this release and at the Investors section of our website at www.volterra.com.