Exhibit 99.3

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

The unaudited pro forma combined condensed balance sheet as of March 31, 2015 is presented as if the acquisition of Xpliant, Inc. (“Xpliant”) had occurred on March 31, 2015. The unaudited pro forma combined condensed statements of operations for the year ended December 31, 2014 and for the three months ended March 31, 2015 are presented as if the acquisition of Xpliant had occurred on January 1, 2014.

The following unaudited pro forma condensed combined financial statements as of March 31, 2015 and for the year ended December 31, 2014 and for the three months ended March 31, 2015 are based on the historical financial statements of Cavium, Inc. (“the Company”) and Xpliant as adjusted for the pro forma impact of applying the acquisition method of accounting in accordance with Generally Accepted Accounting Principles in the United States of America. The pro forma adjustments are based upon available information and assumptions that the Company believes are reasonable. The pro forma adjustments are preliminary and may change as additional information becomes available and have been prepared to illustrate the estimated effect of the acquisition. The unaudited pro forma condensed combined financial statements do not include any pro forma adjustments relating to costs of integration that the combined companies may incur as such adjustments would be forward-looking. The unaudited pro forma combined condensed statements of operations do not reflect nonrecurring charges resulting from the acquisition.

The unaudited pro forma condensed combined financial statements are prepared by management for informational purposes in accordance with Article 11 of Regulation S-X and are not necessarily indicative of future results or of actual results that would have been achieved had the acquisition been consummated as at the dates presented, and should not be taken as representative of future consolidated operating results of the Company. The unaudited pro forma condensed combined financial statements do not reflect any operating efficiencies and/or cost savings that the Company may achieve, or any additional expenses that maybe incurred, with respect to the combined companies.

The unaudited pro forma condensed combined financial statements have been derived from and should be read in conjunction with (i) the audited financial statements and notes thereto of the Company in its Annual Report on Form 10-K as of December 31, 2014 and 2013 and for the years ended December 31, 2014, 2013 and 2012 filed with the Securities and Exchange Commission (“SEC”) on March 2, 2015, (ii) the unaudited financial statements and notes thereto of the Company in its Form 10-Q as of March 31, 2015 and for the three months ended March 31, 2015 and 2014 filed with the SEC on May 4, 2015 (iii) the audited financial statements and notes thereto of Xpliant as of and for the years ended December 31, 2014 and 2013 included in Exhibit 99.1 to this current report on Form 8-K and (iv) the unaudited financial statements and notes thereto of Xpliant as of March 31, 2015 and for the three months ended March 31, 2015 and 2014 included in Exhibit 99.2 to this current report on Form 8-K.

CAVIUM, INC.

UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET

AS OF MARCH 31, 2015

(in thousands)

CAVIUM, INC.

UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS

FOR THE YEAR ENDED DECEMBER 31, 2014

(in thousands, except per share data)

CAVIUM, INC.

UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS

FOR THE THREE MONTHS ENDED MARCH 31, 2015

(in thousands, except per share data)

CAVIUM, INC.

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

The unaudited pro forma condensed combined condensed balance sheet as of March 31, 2015 was based on the historical financial statements of the Company and Xpliant after giving effect the acquisition adjustments resulting from the acquisition of Xpliant. The unaudited pro forma combined balance sheet as of March 31, 2015 was presented as if the acquisition of Xpliant had occurred on March 31, 2015.

The unaudited pro forma combined statements of operations for the year ended December 31, 2014 and for the three months ended March 31, 2015 are based on the historical financial statements of the Company and Xpliant for the periods then ended after giving effect to the acquisition adjustments resulting from the acquisition of Xpliant. The unaudited pro forma combined statements of operations are presented as if the acquisition of Xpliant had occurred on January 1, 2014.

Between May 2012 and March 2015, the Company entered into several note purchase agreements and promissory notes with Xpliant to provide cash advances. Xpliant is a Delaware incorporated and privately held company, engaged in the design and development of next generation software defined network switch chips. Prior to the first closing of the Agreement and Plan of Merger and Reorganization between the Company, Cavium Semiconductor Corporation, Cavium Networks LLC, Xpliant, the parties identified as “Designated Stockholders” in Exhibit A to the Merger Agreement solely for Sections 1.5, 3, and 10 of the Merger Agreement and Guy Hutchison as securityholders’ agent solely for Section 10 of the Merger Agreement, as amended on October 8, 2014 and March 31, 2015 (“the Merger Agreement”) as discussed in detail below, the Company concluded that Xpliant was a variable interest entity as the Company was its primary beneficiary due to the Company’s involvement with Xpliant and the Company’s purchase option to acquire Xpliant. As such, the Company has included the accounts of Xpliant in the consolidated financial statements.

As of March 31, 2015, the Company had made cash advances of $85.8 million, consisting of $10.0 million under nine convertible notes receivable which, as amended, matured on August 31, 2014 and $75.8 million under several promissory notes which mature between April 2015 and March 2016. The outstanding convertible notes and promissory notes bear an annual interest rate of 6%.

In addition to the funding received by Xpliant from the Company, between May 2012 and January 2014, certain third party investors (“non-controlling interest”) made cash advances of $13.0 million under several convertible notes receivable which, as amended, matured on August 31, 2014 and $2.9 million under a convertible security. All of the convertible notes bore interest at a rate of 6%, payable at maturity. Two of the convertible notes held by a third party investor with a principal amount of $1.0 million matured and were paid by Xpliant in December 2013. Pursuant to the convertible notes, in the event Xpliant closes a corporate transaction, as defined in the convertible notes, the holders of the convertible notes were entitled to receive two times the outstanding principal plus any unpaid accrued interest. The convertible security had the same features as the convertible notes, with the exception of the requirement for repayment, interest and maturity. For accounting purposes, the Company determined that the convertible security had derivative features and determined that the fair value of the derivative features of the convertible security at the issuance date was approximately the same as the principal amount. All of the convertible notes and the derivative feature of convertible security were classified as Level 3 liability and were all remeasured and presented at fair value in the consolidated financial statements at each reporting period. Pursuant to the option to acquire Xpliant, in June 2014, the Company provided notice to Xpliant of its decision to exercise the purchase option. As such, the convertible notes and derivative features of convertible security were valued to two times its principal amount at its maturity date. Pursuant to the Merger Agreement between the Company and Xpliant as discussed in detail below, in October 2014, a portion of the cash advances made by the Company to Xpliant were used to settle all outstanding convertible notes, related accrued interest and convertible security held by non-controlling interest.

On July 30, 2014, the Company entered into the Merger Agreement, which was amended on October 8, 2014 and March 31, 2015 with Xpliant. Under the terms of the Merger Agreement, as amended, the Company paid approximately $3.6 million in total cash consideration in exchange for all outstanding securities held by Xpliant’s stockholders. Pursuant to the Merger Agreement, as amended, a first closing occurred on March 31, 2015 with the Company paying $2.5 million to Xpliant’s stockholders with respect to approximately 70% of the Xpliant stock outstanding and a second and final closing occurred on April 29, 2015 with the Company paying $1.1 million to Xpliant’s stockholders with respect to the then remaining approximately 30% of the Xpliant stock outstanding. Based on the substance of the transaction, the Company recorded the payments of cash consideration to Xpliant stockholders as a decrease to the Company’s additional paid-in capital within stockholders’ equity.

Pursuant to the Merger Agreement and in connection with the transaction contemplated by the Merger Agreement, in October 2014, a portion of the cash advances made by the Company to Xpliant were used to settle all outstanding convertible notes, related accrued interest and the convertible security held by non-controlling interest of $30.8 million. Additionally, $1.7 million was used to make cash payments to the employees of Xpliant. Further, per the Merger Agreement, in October 2014, the Company issued RSU’s of approximately 193,000 shares with a fair value of $8.7 million based on the Company’s closing stock price at the grant date to the employees of Xpliant.

The historical financial information has been adjusted to give effect to pro forma events that are (i) directly attributable to the acquisition, (ii) factually supportable, and (iii) with respect to the statement of operations, expected to have a continuing impact on the combined results of the companies. The following pro forma adjustments are included in the unaudited pro forma condensed combined financial statements: