Exhibit 99.3

Cohu, Inc. and Ismeca Semiconductor Holding SA

Unaudited Pro Forma Condensed Combined Financial Statements

Description of Transaction

Cohu, Inc. (referred to as “Cohu”, “we”, “our” and “us”), through its wholly owned semiconductor equipment subsidiary, Delta Design Luxembourg S.à r.l, a company organized under the laws of Luxembourg, (“Delta Luxembourg”), entered into a Share Purchase and Transfer Agreement (the “Purchase Agreement”) with Schweiter Technologies AG (“Seller”), pursuant to which Delta Luxembourg acquired all of the outstanding share capital of Ismeca Semiconductor Holding SA (“Ismeca”, and such transaction, the “Acquisition”). Ismeca, headquartered in La Chaux-de-Fonds, Switzerland, and with major operations in Malacca, Malaysia and Suzhou, China, designs, manufactures and sells turret-based test handling and back-end finishing equipment for integrated circuits, light emitting diodes (LEDs) and discrete components.

The acquisition has been accounted for in conformity with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification 805, Business Combinations (“ASC 805”). The purchase price of this acquisition was approximately $82.9 million, and was funded primarily by cash reserves ($57.1 million) and certain liabilities assumed ($25.7 million). Total consideration has been allocated to the assets acquired and liabilities assumed based on their estimated respective fair values as of the completion of the acquisition. The acquisition of Ismeca resulted in the recognition of a preliminary estimate of goodwill of approximately $13.5 million and has been assigned to our semiconductor equipment segment. These allocations reflect preliminary estimates that were available at the time of the preparation of this Current Report on Form 8-K/A and are subject to change once finalized.

The unaudited pro forma condensed combined financial information reflecting the combination of Cohu and Ismeca is provided for informational purposes only. The pro forma information is not necessarily indicative of what the combined companies’ results of operations actually would have been had the acquisition been completed on the dates indicated. In addition, the unaudited pro forma condensed combined financial information does not purport to project the future financial position or operating results of the combined company. The unaudited pro forma condensed combined financial information was prepared using the purchase method of accounting with Cohu treated as the acquirer. Accordingly, the historical consolidated financial information has been adjusted to give effect to the impact of the consideration issued in connection with the acquisition and to give effect to pro forma events that are (i) directly attributable to the acquisition, (ii) factually supportable, and (iii) with respect to the statements of operations, expected to have a continuing impact on the combined results of the companies.

The unaudited pro forma condensed combined balance sheet presents our historical financial position combined with Ismeca’s as if the acquisition occurred on December 29, 2012, and includes adjustments which give effect to events that are directly attributable to the transaction. Our cost to acquire Ismeca has been allocated to the assets acquired and liabilities assumed based upon management’s preliminary internal valuation estimate of their respective fair values as of the date of the acquisition. Definitive allocations will be performed and finalized based upon certain valuations and other studies that will be performed by Cohu with the assistance, in some cases, of outside valuation specialists. Accordingly, the purchase allocation pro forma adjustments are preliminary and have been made solely for the purpose of providing unaudited pro forma condensed combined financial information and are subject to revision based on a final determination of fair value.

The unaudited pro forma condensed combined statement of operations includes certain purchase accounting adjustments as if the acquisition occurred on January 1, 2012, including items expected to have a continuing impact on the combined results, such as amortization expense of acquired tangible and intangible assets. The unaudited pro forma condensed combined statement of operations does not include the impacts of any revenue, cost or other operating synergies that we may achieve as a result of the acquisition, or any additional expenses or costs of integration that we may incur, with respect to the combined companies as such adjustments are not factually supportable at this point in time. The detailed assumptions used to prepare the pro forma financial information are contained in the notes to the unaudited pro forma condensed combined consolidated financial statements, and such assumptions should be reviewed in their entirety.

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Cohu, Inc. and Ismeca Semiconductor Holding SA

Unaudited Pro Forma Condensed Combined Financial Statements

Cohu’s fiscal years are based on a 52- or 53-week period ending on the last Saturday in December, whereas prior to the acquisition, Ismeca had a December 31^st calendar year-end. In the unaudited pro forma condensed combined statement of operations for the year ended December 29, 2012, Ismeca’s operating results are as of December 31, 2012. In order to prepare the unaudited pro forma condensed combined balance sheet as of December 29, 2012, Ismeca’s historical combined statement of financial position as of December 31, 2012, which is within two (2) days of Cohu’s most recent year-end, was used.

The unaudited pro forma condensed combined consolidated financial statements have been developed from the following sources with the following unaudited adjustments:

Financial information prepared in accordance with Accounting Principles Generally Accepted in the United States of America (“U.S. GAAP”) for Cohu has been extracted without adjustments from Cohu’s audited consolidated balance sheet as of December 29, 2012, and Cohu’s audited consolidated statement of operations for the year then ended, both contained in Cohu’s Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 28, 2013.

Financial information prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”) for Ismeca has been extracted without adjustment from Ismeca’s audited consolidated balance sheet as of December 31, 2012, and consolidated statement of income for the year ended December 31, 2012, contained in Exhibit 99.2 of this Form 8-K/A. These financial statements were originally prepared using the Swiss Franc (“CHF”) as the reporting currency, and have been translated into U.S. dollars (“USD”) in the pro forma financial information using the methodology and the exchange rates outlined in Note 5. Certain adjustments have been made to convert the Ismeca’s IFRS financial information to U.S. GAAP and to align Ismeca’s accounting policies with Cohu’s U.S. GAAP based accounting policies. The basis of these adjustments is explained in the notes to the pro forma financial information.

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COHU, INC. AND ISMECA SEMICONDUCTOR HOLDING SA

UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

As of December 29, 2012

(in thousands)

See accompanying Notes to Unaudited Pro Forma Condensed Combined Financial Statements.

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COHU, INC. AND ISMECA SEMICONDUCTOR HOLDING SA

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

For the Year Ended December 29, 2012

(in thousands, except per share amounts)

See accompanying Notes to Unaudited Pro Forma Condensed Combined Financial Statements.

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COHU, INC. AND ISMECA SEMICONDUCTOR HOLDING SA

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED

FINANCIAL STATEMENTS

Note 1. Basis of Pro Forma Presentation

The unaudited pro forma condensed combined consolidated balance sheet as of December 29, 2012 is presented as if our acquisition of Ismeca had occurred on December 29, 2012, combining the historical audited balance sheet of Cohu at December 29, 2012 and the historical balance sheet of Ismeca at December 31, 2012.

The unaudited pro forma condensed combined consolidated statement of operations for the year ended December 29, 2012, illustrates the effect of the acquisition of Ismeca as if it had occurred on January 1, 2012 and combines the historical audited statement of operations of Cohu for the year ended December 29, 2012 and Ismeca’s historical income statement for the year ended December 31, 2012.

Our acquisition of Ismeca has been accounted for in conformity with ASC 805 and uses the fair value concepts defined in Accounting Standards Codification 820, Fair Value Measurements and Disclosures (“ASC 820-10”). ASC 805 requires, among other things, that most assets acquired and liabilities assumed in an acquisition be recognized at their fair values as of the acquisition date and requires that fair value be measured based on the principles in ASC 820-10. ASC 820-10 clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. ASC 820-10 also requires that a fair value measurement reflect the assumptions market participants would use in pricing an asset or liability based on the best information available.

Under ASC 805, acquisition-related transaction costs (e.g., professional fees for legal, accounting, tax, due diligence, valuation and other related services, etc.) are not included as a component of consideration transferred, but are accounted for as expenses in the periods in which the costs are incurred. Total acquisition-related transaction costs incurred by Cohu during the year ended December 29, 2012 were approximately $2.3 million and are included in selling, general and administrative expense. Seller divestment bonuses of approximately $3.1 million are included in Ismeca’s income statement for the year ended December 31, 2012.

Note 2. Summary of Significant Accounting Policies

The pro forma condensed combined consolidated information has been compiled in a manner consistent with the accounting policies adopted by Cohu. Adjustments were made for the differences between IFRS and U.S. GAAP, as set out further in Note 5, together with adjustments arising as part of acquisition accounting. Apart from these adjustments, the accounting policies of Ismeca were not deemed to be materially different from those adopted by Cohu.

Note 3. Preliminary Purchase Price Allocation

The total estimated purchase price was allocated to Ismeca’s net tangible and intangible assets based on their estimated fair values as of December 29, 2012, the effective date of the acquisition for the purposes of this pro forma presentation. The table below represents a preliminary allocation of purchase price based on management’s internal evaluation to estimate their respective fair values, as described in the introduction to these unaudited pro forma condensed combined financial statements (in thousands):

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COHU, INC. AND ISMECA SEMICONDUCTOR HOLDING SA

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED

FINANCIAL STATEMENTS

Upon completion of the fair value assessment, Cohu anticipates that the ultimate purchase price allocation will differ from the preliminary assessment outlined above. Any changes to the initial estimates of the fair value of the assets and liabilities will likely be allocated to intangible assets or residual goodwill and related deferred taxes.

Of the total purchase price, $25.4 million has been allocated to definite and indefinite-lived intangible assets acquired. Definite-lived intangible assets of $20.5 million consist of the value assigned to Ismeca’s unpatented complete technology of $16.8 million, customer relationships of $3.6 million and trade name of $4.9 million. The amortization related to these intangible assets is reflected as a pro forma adjustment to the unaudited pro forma condensed combined statement of operations. Any excess of the purchase price over the estimated fair value of the net assets acquired has been recorded as goodwill. The acquisition was nontaxable and certain of the assets acquired, including goodwill and intangibles, will not be deductible for tax purposes.

The preliminary allocation of the other intangible assets included in these pro forma financial statements is as follows:

The value assigned to Ismeca’s unpatented complete technology was determined by discounting the estimated future cash flows associated with the existing developed and core technologies to their present value. Developed and core technology, which comprise products that have reached technological feasibility, includes the products in Ismeca’s product line. The revenue estimates used to value the unpatented complete technology were based on estimates of relevant market sizes and growth factors, expected trends in technology and the nature and expected timing of new product introductions by Ismeca and its competitors. The rates utilized to discount the net cash flows of unpatented complete technology to their present value are based on the risks associated with the respective cash flows taking into consideration the weighted average cost of capital of Cohu’s semiconductor equipment segment.

The value assigned to Ismeca’s customer relationships was determined by discounting the estimated cash flows associated with the existing customers as of the acquisition date taking into consideration expected attrition of the existing customer base. The estimated cash flows were based on revenues for those existing customers net of operating expenses and net contributory asset charges associated with servicing those customers. The estimated revenues were based on revenue growth rates for the back-end semiconductor equipment industry. Operating expenses were estimated based on the supporting infrastructure expected to sustain the assumed revenue growth rates. Net contributory asset charges were based on the estimated fair value of those assets that contribute to the generation of the estimated cash flows.

The acquired intangible assets related to the Ismeca acquisition will result in the following approximate annual amortization expense in future periods (in thousands):

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COHU, INC. AND ISMECA SEMICONDUCTOR HOLDING SA

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED

FINANCIAL STATEMENTS

Note 4. Pro Forma Adjustments

Pro forma adjustments are necessary to reflect the estimated purchase price, to adjust amounts related to Ismeca’s net tangible and intangible assets to a preliminary estimate of the fair values of those assets, to reflect the amortization expense related to the estimated amortizable intangible assets and to reclassify certain of Ismeca’s amounts to conform to Cohu’s presentation.

In the process of finalizing our purchase price allocation, if information becomes available which would indicate the existence of a material preacquisition contingency and it is determined that events giving rise to the contingency occurred prior to the acquisition date and the amounts can be reasonably estimated, such items will be included in our final purchase price allocation.

The pro forma adjustments included in the unaudited pro forma condensed combined balance sheet are as follows:

The pro forma adjustments included in the unaudited pro forma condensed combined statements of operations are as follows:

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COHU, INC. AND ISMECA SEMICONDUCTOR HOLDING SA

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED

FINANCIAL STATEMENTS

Note 5. IFRS to U.S. GAAP Adjustments and Foreign Currency Translation

The consolidated financial statements of Ismeca, have been prepared and presented in accordance with IFRS as issued by the IASB which varies in certain significant respects from U.S. GAAP. The principal differences between IFRS and U.S. GAAP that affect the Ismeca financial statements relate to the treatment of revenue recognition, the accounting for post-retirement benefits, and the related income tax effect.

Ismeca translated its historical financial information into CHF based upon the requirements of IFRS. Based upon our review of Ismeca’s historical financial statements and our understanding of the differences between U.S. GAAP and IFRS, we are not aware of any further adjustments that we would need to make to Ismeca’s historical financial statements relating to foreign currency translation. Certain balances have been reclassified from the Ismeca financial statements so that their presentation would be consistent with Cohu. Ismeca’s reporting currency for its historical financial information is the CHF. The U.S. GAAP financial information has been translated from CHF to USD using historic average exchange rates applicable to Ismeca during the period presented for the Pro Forma Statement of Operations and the period end exchange rate for the Pro Forma Balance Sheet.

Consolidated Balance Sheet

The following table reflects the adjustments made to Ismeca’s consolidated balance sheet as of December 31, 2012 to convert IFRS to U.S. GAAP and from CHF to USD using an exchange rate of 1.09 per franc:

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COHU, INC. AND ISMECA SEMICONDUCTOR HOLDING SA

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED

FINANCIAL STATEMENTS

Consolidated Statement of Income

The following table reflects the adjustments made to Ismeca’s consolidated statement of operations for the twelve months ended December 31, 2012 to convert IFRS to U.S. GAAP and from CHF to USD using an exchange rate of 1.07 per franc:

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COHU, INC. AND ISMECA SEMICONDUCTOR HOLDING SA

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED

FINANCIAL STATEMENTS

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