Exhibit 99.3

CALGON CARBON CORPORATION

UNAUDITED PRO FORMA COMBINED FINANCIAL INFORMATION

(Dollars in thousands except per share data)

On November 2, 2016, Calgon Carbon Corporation (the “Company”) acquired the Activated Carbon and Filter Aid Business (“AC&FAB”) of Arkema Group, a foreign entity. AC&FAB is a specialty chemical group manufacturing purification and filtration products primarily for the Beverage, Pharmaceutical and Agrofood industries, on a worldwide basis. The Company completed the acquisition of the AC&FAB for approximately $157.4 million.

The Unaudited Pro Forma Combined Financial Statements (the “Statements”) are based on the Company’s historical consolidated financial statements and the AC&FAB historical combined financial statements as adjusted to give effect to the Company’s acquisition of the AC&FAB and the related financing transactions. The Unaudited Pro Forma Combined Statements of Income for the nine months ended September 30, 2016 and the year ended December 31, 2015 gives effect to these transactions as if they had occurred on January 1, 2015. The Unaudited Pro Forma Combined Balance Sheet as of September 30, 2016 gives effect to these transactions as if they had occurred on September 30, 2016.

The Statements were prepared in accordance with Article 11 of SEC Regulation S-X. The pro forma adjustments, reflecting the completion of the transaction, are based upon the acquisition method of accounting in accordance with generally accepted accounting principles of the United States (“U.S. GAAP”), and upon the assumptions set forth in the notes to the Statements. The assumptions and estimates underlying the unaudited adjustments to the Statements are described in the accompanying notes, which should be read together with the Statements.

The Statements should be read together with the Company’s historical financial statements, which are included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 and Quarterly Report on Form 10-Q for the nine months ended September 30, 2016, and the AC&FAB’s historical combined financial statements included as Exhibits 99.1 and 99.2.

A final determination of the fair values of assets to be acquired and liabilities to be assumed relating to the Company’s acquisition of the AC&FAB may differ materially from preliminary estimates. This final valuation will also be based on the fair value of the actual net tangible and intangible assets of the AC&FAB that exist as of the date of the completion of the acquisition. The final valuation may materially change the allocation of the purchase price, which could materially affect the fair values assigned to the assets and liabilities and could result in a material change to the Statements.

CALGON CARBON CORPORATION

UNAUDITED PRO FORMA COMBINED BALANCE SHEET

As of September 30, 2016

(Dollars in thousands except per share data)

The accompanying notes are an integral part of these unaudited pro forma combined financial statements.

CALGON CARBON CORPORATION

UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME

For the nine months ended September 30, 2016

(Dollars in thousands except per share data)

The accompanying notes are an integral part of these unaudited pro forma combined financial statements.

CALGON CARBON CORPORATION

UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME

For the year ended December 31, 2015

(Dollars in thousands except share data)

The accompanying notes are an integral part of these unaudited pro forma combined financial statements.

CALGON CARBON CORPORATION

NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS

(Dollars in thousands)

1.              Basis of Presentation

The Company’s historical financial statements have been adjusted in the Statements to give effect to pro forma events that are (1) directly attributable to the business combination, (2) factually supportable and (3) with respect to the pro forma combined statements of income, expected to have a continuing impact on the combined results following the business combination.

The business combination was accounted for under the acquisition method of accounting in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 805, Business Combinations. As the acquirer for accounting purposes, the Company has estimated the fair value of the AC&FAB assets acquired and liabilities assumed and conformed the accounting policies of the AC&FAB to its own accounting policies.

The Statements do not necessarily reflect what the combined Company’s financial condition or results of operations would have been had the acquisition and related financing transactions occurred on the dates indicated. They also may not be useful in predicting the future financial condition and results of operations of the combined company. The actual financial position and results of operations may differ significantly from the pro forma amounts reflected herein due to a variety of factors.

The Statements do not reflect the realization of any expected cost savings or other synergies from the acquisition of the AC&FAB as a result of restructuring activities and other planned cost savings initiatives following the completion of the business combination.

The Statements have been compiled using the significant accounting policies as set forth in the Company’s audited consolidated financial statements included in its Form 10-K for the fiscal year ended December 31, 2015. The accounting policies of the AC&FAB are similar in most material respects to those of the Company, except for those reclassification adjustments included in Note 3 and Note 4. Adjustments were made to exclude certain of the AC&FAB assets and liabilities that were not acquired by the Company in this acquisition, conform to the Company’s classification of certain assets and liabilities, and translate the Euro amounts into U.S. dollars as set out further in Note 3. Additionally in Note 4, adjustments were made to convert the financial statements of the AC&FAB from International Financial Reporting Standards (“IFRS”) to U.S. GAAP as applied by the Company. Apart from the IFRS to U.S. GAAP adjustments discussed, the Company is not aware of any other differences that would have a material impact on the Statements. Although it is believed that the adjustments to the AC&FAB’s financial statements represent the known material adjustments to conform to U.S. GAAP, the accompanying unaudited pro forma IFRS to U.S. GAAP adjustments are preliminary and are subject to further adjustments as additional information becomes available and as additional analyses are performed.

2.              Preliminary purchase price allocation

This preliminary purchase price allocation has been used to prepare the pro forma adjustments in the pro forma balance sheet and statements of income. The Company has performed a preliminary valuation analysis of the fair market value of the AC&FAB assets acquired and liabilities assumed. The final allocation could differ materially from the preliminary allocation used in the pro forma adjustments. The final allocation may include (1) changes in fair values of property, plant and equipment, (2) changes in fair values of inventories (3) changes in allocations to intangible assets such as trade names, technology and customer relationships as well as goodwill, (4) changes for U.S. GAAP adjustments to measure pension liabilities and (5) other changes to assets and liabilities. The following table summarizes the allocation of the preliminary purchase price as of the acquisition date (in thousands):

The following discussion summarizes the valuation approaches used by the Company to determine the preliminary fair values of certain assets and liabilities.

Inventories: Inventories acquired include raw materials, work-in-process and finished goods. The fair value of raw materials and work-in-process was determined based on the estimated selling price of the eventual finished inventories, adjusted for expected: (i) costs to complete the manufacturing process; (ii) costs of the selling effort; and (iii) a reasonable profit allowance for the remaining manufacturing and selling effort. The fair value of finished goods was determined based on the estimated selling price, net of selling costs and a reasonable profit margin.

Property, plant and equipment: Property, plant and equipment acquired will be depreciated using the straight-line method over the estimated remaining useful lives ranging from one to twenty seven years based on the Company’s preliminary valuation using Cost and Market Approaches.

Identifiable intangible assets: Identifiable intangible assets acquired include customer relationships, technology, and trademarks and trade names. The fair value of intangible assets was based on the

Company’s preliminary valuation. Valuation approaches used include the Income Approach, Market Approach and Cost Approach.  Estimated useful lives of amortizable intangible assets are based on the time periods during which the intangibles are expected to result in incremental cash flows. Trademarks and trade names are deemed to have indefinite lives.

Goodwill: Goodwill represents the excess of the preliminary acquisition consideration over the estimated fair values of net assets acquired. Goodwill will not be amortized and is not deductible for tax purposes. Goodwill will be tested for impairment at least annually or whenever certain indicators of impairment are present.

Deferred tax assets and liabilities: Deferred income taxes are determined based on the estimated future tax effects of differences between financial statement carrying amounts and the tax bases of existing assets and liabilities.

3.              Adjustments to AC&FAB Financial Statements

On November 2, 2016, the Company along with Chemviron France SAS, Calgon Carbon (Suzhou) Co., Ltd. and Chemviron SPRL (collectively, the “Buyers”) entered into an Amendatory Agreement (the “Amendment”) with Arkema France S.A., CECA S.A., Arkema S.R.L. and Arkema Shanghai Distribution Co. Ltd (the “Sellers”) amending certain terms and conditions of that certain Asset and Share Purchase Agreement dated July 25, 2016 (the “Purchase Agreement”) with CECA, S.A., a French société anonyme (“CECA”), Arkema S.r.l, an Italian limited liability company (“Arkema Italy”) and Arkema Shanghai Distribution Co Ltd, a company incorporated under the laws of the People’s Republic of China (“Arkema Shanghai”), and together with CECA and Arkema, (the “Sellers”) providing for the acquisition by the Buyers of the Sellers’ Activated Carbon and Filtration Aid Business. The Amendment was entered into to address the removal of certain immaterial assets from the transaction and accordingly adjust the purchase price. This Purchase Agreement and Amendment were filed as exhibits to the Form 8-K filed by the Company on November 8, 2016. The Purchase Agreement and the Amendment details excluded assets and liabilities related to CECA, S.A. in France.

The historical financial information of the AC&FAB was prepared in accordance with IFRS and presented in Euro. The IFRS to US GAAP adjustments are reflected in the pro forma adjustments discussed in Note 4, while the historical financial information below was adjusted to give effect to other items, including the following:

1)             Excluded assets and liabilities not acquired in the acquisition: The Purchase Agreement and the Amendment exclude certain assets and liabilities including accounts receivable, payables and other working capital accounts. In addition, the long-term debt of the AC&FAB was not assumed as part of the acquisition. Although certain assets and liabilities have been excluded from the acquisition, these inputs could be easily replaced or replicated by the Company. As such, all revenue producing activities associated with the AC&FAB business remain substantially the same before and after the business combination.  Therefore, no AC&FAB revenue producing activities have been excluded from the AC&FAB statements of income.

2)             Reclassification adjustments: The balance sheet and income statement were revised to conform the presentation of certain financial statement line items to that of the Company. The

reclassification adjustments primarily relate to certain asset and liability line items as well as the reclassification of certain sales and expenses.

3)             Foreign currency translation: As the AC&FAB’s functional currency is different from the Company’s functional currency, the Company is required to translate the Euro (EUR) denominated financial statements of the AC&FAB to U.S. dollars (USD) for purposes of preparing pro forma financial statements. The historical balance sheet as of September 30, 2016 was translated from Euro to US dollars using the period end exchange rate of USD/EUR 1.1212 as of September 30, 2016. The statements of income were translated using the average USD/EUR exchange rates of 1.12024 and 1.08699 for the nine months ended September 30, 2016 and year ended December 31, 2015, respectively.

UNAUDITED AC&FAB PRO FORMA BALANCE SHEET

As of September 30, 2016

(in thousands)