Exhibit 99.4

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION OF

CENTENE AND FIDELIS CARE

The unaudited pro forma condensed combined statements of operations for the three months ended March 31, 2018, and for the year ended December 31, 2017, combine the historical consolidated statements of operations of Centene Corporation (“Centene” or the “Company”) and New York State Catholic Health Plan, Inc. (d/b/a Fidelis Care New York) (“Fidelis Care”), giving effect to the Fidelis Acquisition (as defined in Note 1) and the financing of the Fidelis Acquisition (the “Acquisition Financing”) as if they each had occurred on January 1, 2017. The unaudited pro forma condensed combined balance sheet as of March 31, 2018, combines the historical consolidated balance sheets of the Company and Fidelis Care, giving effect to the Acquisition Financing and the Fidelis Acquisition, as more fully described in Note 7 and Note 1, respectively, as if they each had occurred on March 31, 2018. The historical consolidated financial information has been adjusted in the unaudited pro forma condensed combined financial statements to give effect to pro forma events that are (i) directly attributable to the Fidelis Acquisition, (ii) factually supportable and (iii) with respect to the statements of operations, expected to have a continuing impact on the combined results. The unaudited pro forma condensed combined financial information should be read in conjunction with the accompanying notes to the unaudited pro forma condensed combined financial statements. In addition, the unaudited pro forma condensed combined financial information was derived from and should be read in conjunction with the following historical consolidated financial statements and accompanying notes:

The unaudited pro forma condensed combined financial information has been prepared by us using the acquisition method of accounting in accordance with GAAP. We have been treated as the acquirer in the Fidelis Acquisition for accounting purposes. The acquisition accounting is dependent upon certain valuation and other studies that have yet to commence or progress to a stage where there is sufficient information for a definitive measurement. In addition, under certain relevant laws and regulations, before completion of the Fidelis Acquisition, there were certain limitations regarding what we could learn about Fidelis Care prior to closing. Due to the recent completion of the Fidelis Acquisition, we have not yet reviewed all relevant information. The assets and liabilities of Fidelis Care have been measured based on various preliminary estimates using assumptions that we believe are reasonable based on information that is currently available. Differences between these preliminary estimates and the final acquisition accounting may occur, and those differences could have a material impact on the accompanying unaudited pro forma condensed combined financial statements and the combined company’s future results of operations and financial position. The pro forma adjustments are preliminary and have been made solely for informational purposes.

We intend to commence the necessary valuation and other studies required to complete the acquisition accounting promptly and will finalize the acquisition accounting as soon as practicable within the required measurement period in accordance with ASC 805, but in no event later than one year following completion of the Fidelis Acquisition.

-1-

The unaudited pro forma adjustments are based upon available information and certain assumptions that our management believes are reasonable. The unaudited pro forma condensed combined financial information has been presented for informational purposes only and is based on assumptions and estimates considered appropriate by our management; however, it is not necessarily indicative of our financial position or results of operations that would have been achieved had the pro forma events taken place on the dates indicated, or of the future consolidated results of operations or of the financial position of the combined company. You should not place undue reliance on the unaudited pro forma condensed combined financial information in making investment decisions.

Management expects that the strategic and financial benefits of the Fidelis Acquisition will result in certain cost savings opportunities. However, given the preliminary nature of those cost savings, they have not been reflected in the accompanying unaudited pro forma condensed combined statements of operations. For a discussion of risks related to anticipated cost savings, see “Risk Factors—Factors that may affect Future Results and the Trading Price of Our Common Stock—The combined company may be unable to successfully integrate our business with the assets acquired in the Proposed Fidelis Acquisition and realize the anticipated benefits of the Proposed Fidelis Acquisition” in Item 1A. of Part II of our Quarterly Report on Form 10-Q for the three months ended March 31, 2018.

-2-

Unaudited Pro Forma Condensed Combined Statement of Operations

For the Three Months Ended March 31, 2018

(In millions, except per share data in dollars and shares in thousands)

See the accompanying notes to the unaudited pro forma condensed combined financial statements, which are an integral part of this statement. The pro forma adjustments are explained in Note 6. Income Statement Pro Forma Adjustments, beginning on page 9.

-3-

Unaudited Pro Forma Condensed Combined Statement of Operations

For the Year Ended December 31, 2017

(In millions, except per share data in dollars and shares in thousands)

See the accompanying notes to the unaudited pro forma condensed combined financial statements, which are an integral part of this statement. The pro forma adjustments are explained in Note 6. Income Statement Pro Forma Adjustments, beginning on page 9.

-4-

Unaudited Pro Forma Condensed Combined Balance Sheet

As of March 31, 2018

(In millions, except shares in thousands)

See the accompanying notes to the unaudited pro forma condensed combined financial statements, which are an integral part of this statement. The pro forma adjustments are explained in Note 7. Balance Sheet Pro Forma Adjustments, beginning on page 10.

-5-

NOTES TO THE PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

(DOLLARS IN MILLIONS, EXCEPT SHARE DATA)

(UNAUDITED)

1. Description of Transaction

Effective on July 1, 2018, pursuant to the Asset Purchase Agreement, between the Company and Fidelis Care, dated as of September 12, 2017, Centene acquired substantially all of the assets and assumed certain liabilities of Fidelis Care for $3.75 billion in cash, reduced by a $375.0 million escrow which will be used to satisfy any post-closing indemnification claims, subject to a working capital adjustment (the “Fidelis Acquisition”).

2. Basis of Presentation

The unaudited pro forma condensed combined financial information was prepared using the acquisition method of accounting and was based on the historical financial statements of the Company and Fidelis Care. The acquisition method of accounting is based on ASC 805 and uses the fair value concepts defined in ASC 820, Fair Value Measurements.

ASC 805 requires, among other things, that most assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. In addition, ASC 805 requires that the consideration transferred be measured at the date the Fidelis Acquisition is completed at the then-current market price.

ASC 820 defines the term “fair value” and sets forth the valuation requirements for any asset or liability measured at fair value, expands related disclosure requirements and specifies a hierarchy of valuation techniques based on the nature of the inputs used to develop the fair value measures. Fair value is defined in ASC 820 as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.” This is an exit price concept for the valuation of the asset or liability. In addition, market participants are assumed to be buyers and sellers in the principal (or the most advantageous) market for the asset or liability. Fair value measurements for an asset assume the highest and best use by these market participants. As a result of these standards, the Company may be required to record the fair value of assets which are not intended to be used or sold and/or to value assets at fair value measures that do not reflect the Company’s intended use of those assets. Many of these fair value measurements can be highly subjective, and it is possible that other professionals, applying reasonable judgment to the same facts and circumstances, could develop and support a range of alternative estimated amounts.

Under the acquisition method of accounting, the assets acquired and liabilities assumed will be recorded, as of completion of the Fidelis Acquisition, primarily at their respective fair values and added to those of the Company. Financial statements and reported results of operations of the Company issued after completion of the Fidelis Acquisition will reflect these values, but will not be retroactively restated to reflect the historical financial position or results of operations of Fidelis Care.

Under ASC 805, acquisition-related transaction costs (e.g., advisory, legal, accounting, valuation and other professional fees) 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 expected to be incurred by the Company are estimated to be approximately $410 million, of which $15 million had been incurred as of March 31, 2018. Acquisition-related transaction costs expected to be incurred by the Company include fees related to a bridge financing commitment agreement and other advisory fees associated with the transaction as well as certain anticipated undertakings with the New York State Department of Health. Those costs are reflected in the unaudited pro forma condensed combined balance sheet as an increase to accrued expenses and other current liabilities, with the related tax benefits reflected as an increase in other current assets and the after tax impact presented as a decrease to retained earnings.

The unaudited pro forma condensed combined financial statements do not reflect the projected realization of any anticipated cost savings following completion of the Fidelis Acquisition. These potential cost savings opportunities are expected to arise from network and medical management savings, as well as administrative cost savings. The unaudited pro forma condensed combined financial statements do not reflect projected pretax restructuring and integration charges associated with the projected cost savings.

-6-

3. Accounting Policies

The Company is in the process of reviewing Fidelis Care’s accounting policies to determine if differences in accounting policies require restatement or reclassification of results of operations or reclassification of assets or liabilities to conform to the Company’s accounting policies and classifications. As a result of that review, the Company may identify differences between the accounting policies of the two companies that, when conformed, could have a material impact on the combined financial statements. At this time, the Company is not aware of any differences that would have a material impact on the combined financial statements. The unaudited pro forma condensed combined financial statements assume there are no material differences in accounting policies.

4. Consideration Transferred

The following is a summary of consideration transferred to effect the acquisition of Fidelis Care:

5. Estimate of Assets Acquired and Liabilities Assumed

The following is a preliminary estimate of the assets acquired and the liabilities assumed by the Company in the Fidelis Acquisition, reconciled to the total consideration transferred:

-7-

The fair value of identifiable intangible assets is determined primarily using variations of the “income approach,” which is based on the present value of the future after-tax cash flows attributable to each identified intangible asset. Other valuation methods, including the market approach and cost approach, are also considered in estimating the fair value. Under the Hart-Scott-Rodino Antitrust Improvements Act and other relevant laws and regulations, there were significant limitations on the Company’s ability to obtain specific information about the Fidelis Care intangible assets prior to completion of the Fidelis Acquisition. Due to the recent completion of the Fidelis Acquisition, the Company has not yet reviewed all such relevant information.

At this time, the Company has not yet sufficiently reviewed relevant information as to the amount, timing and risk of cash flows of all of Fidelis Care’s identifiable intangible assets to determine their fair value. Some of the more significant assumptions inherent in the development of intangible asset values, from the perspective of a market participant, include: the amount and timing of projected future cash flows (including revenue and profitability); the discount rate selected to measure the risks inherent in the future cash flows; and the assessment of the asset’s life cycle and the competitive trends impacting the asset. However, for purposes of these unaudited pro forma condensed combined financial statements and using publicly available information, such as historical revenues, Fidelis Care’s cost structure, industry information for comparable intangible assets and certain other high-level assumptions, the fair value of Fidelis Care’s identifiable intangible assets and their weighted-average useful lives have been estimated as follows:

These preliminary estimates of fair value and weighted-average useful life will likely be different from the final acquisition accounting, and the difference could have a material impact on the accompanying unaudited pro forma condensed combined financial statements. Once the Company has sufficiently reviewed information about Fidelis Care’s intangible assets, additional insight will be gained that could impact (i) the estimated total value assigned to intangible assets, (ii) the estimated allocation of value between finite-lived and indefinite-lived intangible assets and/or (iii) the estimated useful lives of intangible assets. The estimated intangible asset values and their useful lives could be impacted by a variety of factors that may become known to the Company only upon sufficient review of additional information and/or by changes in such factors. These factors include, but are not limited to, changes in the regulatory, legislative, legal, technological and competitive environments. Increased knowledge about these and/or other elements could result in a change to the estimated fair value of the identifiable Fidelis Care intangible assets and/or to the estimated weighted-average useful lives from what the Company has assumed in these unaudited pro forma condensed combined financial statements. The combined effect of any such changes could then also result in a significant increase or decrease to the Company’s estimate of associated amortization expense.

-8-

6. Income Statement Pro Forma Adjustments

This note should be read in conjunction with Note 1. Description of Transaction; Note 2. Basis of Presentation; Note 4. Consideration Transferred; and Note 5. Estimate of Assets Acquired and Liabilities Assumed. Adjustments included in the column under the heading “Pro Forma Adjustments” represent the following:

(*) Assumes an estimated $1.0 billion of finite-lived intangibles and a weighted average amortization period of 13 years (Refer to Note 5. Estimate of Assets Acquired and Liabilities Assumed).

-9-

7. Balance Sheet Pro Forma Adjustments

This note should be read in conjunction with Note 1. Description of Transaction; Note 2. Basis of Presentation; Note 4. Consideration Transferred; and Note 5. Estimate of Assets Acquired and Liabilities Assumed. Adjustments included in the column under the heading “Pro Forma Adjustments” represent the following:

-10-

-11-