Exhibit 99.3

UNAUDITED PRO FORMA

CONDENSED COMBINED FINANCIAL INFORMATION

The following table shows unaudited pro forma condensed combined financial information about the financial condition and results of operations, including per share data, after giving effect to the merger (the “merger”) of Wand Merger Corporation, a wholly owned subsidiary of WMIH Corp. (“WMIH”) and Nationstar Mortgage Holdings Inc. (“Nationstar”) and related financing transaction. The unaudited pro forma condensed combined financial information assumes that the merger is accounted for under the acquisition method of accounting, and that the assets and liabilities of Nationstar will be recorded by WMIH at their respective estimated fair values as of the date the merger is completed. The unaudited pro forma condensed combined balance sheet gives effect to the transactions as if the transactions had occurred on March 31, 2018. The unaudited pro forma condensed combined statements of operations for the three months ended March 31, 2018 and the year ended December 31, 2017 give effect to the transactions as if the transactions had become effective on January 1, 2017. The unaudited selected pro forma condensed combined financial information has been derived from and should be read in conjunction with the consolidated financial statements and related notes of WMIH, which were included in WMIH’s Annual Report on Form 10-K for the year ended December 31, 2017, the consolidated financial statements and related notes of Nationstar, which were included in Nationstar’s Annual Report (Form 10-K) for the year ended December 31, 2017.

The unaudited pro forma condensed combined financial information is presented for illustrative purposes only and does not indicate the financial results of the combined company had the companies actually been combined at the beginning of the period presented, nor the impact of possible business model changes. The unaudited pro forma condensed combined financial information also does not consider any potential effects of changes in market conditions on revenues, expense efficiencies, asset dispositions, and share repurchases, among other factors, including those discussed in the section entitled “Risk Factors” beginning on page 33 of WMIH’s joint proxy statement/prospectus on Form S-4 (No. 333-223862). In addition, as explained in more detail in the accompanying notes included herein, the preliminary allocation of the pro forma purchase price reflected in the unaudited pro forma condensed combined financial information is subject to adjustment and may vary significantly from the actual purchase price allocation that will be recorded upon completion of the merger.

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UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

AS OF MARCH 31, 2018

(millions of dollars)

See accompanying notes to the unaudited pro forma condensed combined financial statements.

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UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

THREE MONTHS ENDED MARCH 31, 2018

(millions of dollars, except for per share data)

See accompanying notes to the unaudited pro forma condensed combined financial statements.

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UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

YEAR ENDED DECEMBER 31, 2017

(millions of dollars, except for per share data)

See accompanying notes to the unaudited pro forma condensed combined financial statements.

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Notes to Unaudited Pro Forma Condensed Combined Financial Statements

Note 1—Basis of Presentation

The unaudited pro forma condensed combined financial information has been prepared to give effect to the merger involving WMIH and Nationstar and the financing transaction as if the transactions had occurred as of March 31, 2018 for the condensed combined balance sheet and as of January 1, 2017 for the condensed statements of operations.

The unaudited pro forma condensed combined financial information is presented for illustrative purposes only and is not necessarily indicative of the results of operations or financial position had the merger, purchase of Nationstar common stock, the common stock issuance and debt issuance been consummated during the periods presented, nor is it necessarily indicative of the results of operations in future periods or the future financial position of the combined entities. Certain historical financial information of WMIH has been reclassified to conform to the current presentation. The merger, which is currently expected to be completed in the second half of 2018, provides for the issuance of 12.7793 shares of WMIH common stock in exchange for each share of Nationstar common stock and is subject to approval of WMIH and Nationstar shareholders and certain regulatory agencies. Applying the exchange ratio to WMIH’s closing price on May 21, 2018 of $1.40 per share implies a value of $17.89 per stock electing share for Nationstar stockholders.

The merger will be accounted for as an acquisition by WMIH using the acquisition method of accounting. Accordingly, the assets and liabilities of Nationstar will be recorded at their respective estimated fair values based on current available information. To the extent that the purchase price exceeds the fair value of net assets acquired, the excess will result in goodwill. Alternatively, if the fair value of the net assets acquired exceeds the purchase price, the transaction could result in a bargain purchase gain that is recognized immediately in earnings. The pro forma adjustments included herein are subject to change depending on changes in market interest rates and the composition of asset and liability balances, as well as additional information that becomes available and additional analysis that is performed. The final allocation of the purchase price will be determined after the merger is completed and after completion of thorough analysis to determine the fair value of Nationstar’s tangible and identifiable intangible assets and liabilities as of the date the merger is completed. Increases or decreases in the estimated fair values of the net assets, commitments, executory contracts, and other items of Nationstar as compared with the information shown in the unaudited pro forma condensed combined financial information may change the amount of the purchase price allocated to goodwill or bargain purchase gain and may impact the statement of income due to adjustments in yield and/or amortization of the adjusted assets or liabilities. Any changes to Nationstar’s shareholders’ equity through the date the merger is completed will also change the purchase price allocation, which may include the recording of goodwill or bargain purchase gain. The final adjustments may be materially different from the unaudited pro forma adjustments presented herein. The accounting policies of both WMIH and Nationstar are in the process of being reviewed in detail. Upon completion of such review, conforming adjustments or financial statement reclassifications may be determined.

Note 2—Financing Transaction

The aggregate amount of cash to be paid as merger consideration in the merger is approximately $1.2 billion. WMIH currently plans to fund the cash component of the merger consideration, the repayment of approximately $1.9 billion of outstanding senior unsecured notes assumed from Nationstar, and the payment of fees and expenses related to the merger through a combination of cash on hand and proceeds from the issuance of debt securities.

WMIH has obtained $2.75 billion in debt commitments from certain lenders to provide a senior unsecured term loan bridge facility (which we refer to as the “bridge facility”). The bridge facility is expected to have an initial maturity date that is the one-year anniversary of the closing date of the merger, and will be automatically converted into term loans in different tranches on the initial maturity date, with extended maturity dates ranging from 5 years to 10 years. The new debt is assumed to have an annual interest rate of 7%.

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Note 3—Preliminary Purchase Price Allocation

The pro forma adjustments include the purchase accounting entries to record the merger transaction. The preliminary allocation of the purchase price paid to the fair values of the assets and liabilities acquired is summarized in the table below (amounts in millions except per share data):

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Note 4—Conversion of Preferred Stocks and Equity Awards and Exercise of Warrants

WMIH

WMIH has 600,000 shares of Series B preferred stock issued and outstanding with aggregate liquidation preference of $600 million at March 31, 2018. Upon the closing of the merger, all of the outstanding Series B preferred stock will be mandatorily converted into WMIH common stock at a price of $1.35 per share, and holders of Series B preferred stock will be entitled to a special, one-time distribution of WMIH common stock and accrued and unpaid dividends payable in WMIH common stock.

In addition, with the closing of the merger, all outstanding warrants, which are exercisable for an aggregate of 61,400,000 shares of WMIH common stock, will be exchanged for 21,197,619 shares of WMIH common stock.

Nationstar

Shortly before closing, each shareholder of Nationstar will have the option to elect to receive either $18.00 in cash or 12.7793 shares of WMIH common stock for each of their Nationstar shares. Because the number of Nationstar shares receiving cash consideration and the number of Nationstar shares receiving stock consideration are each fixed, the cash / stock elections will be subject to pro-ration. Fortress, the existing largest shareholder of Nationstar, has contractually agreed to elect at least 50% of their position in cash.

Note 5—Pro Forma Adjustments

The following pro forma adjustments have been reflected in the unaudited pro forma condensed combined financial information. All adjustments are based on preliminary assumptions and valuations, which are subject to change.

(a) Represents the payment from available cash and cash equivalents of $28 million and restricted cash of $576 million to fund the purchase price. In addition, the adjustment includes cash of $33 million remaining from the proceeds received from the issuance of new debt after the repayment of existing debt and the payment of transaction costs associated with the merger.

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(b) Represents adjustments to estimated fair value. The majority of fair value adjustments are related to reverse mortgage interests and other nonrecourse debt, which primarily comprises participating interest financing and home equity conversion mortgage (which we refer to as “HECM”) securitizations. Fair value for these were assessed based on the following:

(c) Reflects elimination of Nationstar’s historical intangible assets and recognition of the estimated preliminary fair value of identifiable intangible assets attributable to the merger. See Note 3, Preliminary Purchase Price Allocation. The preliminary identifiable intangible assets consist of and result in the following pro forma adjustment (amounts in millions):

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Adjustments to amortization expense for definite-lived assets were based on historical amortization expense recorded for period presented compared to the amortization expense for estimated fair value intangible assets post-merger. The following table details the pro forma adjustment to amortization expense (amounts in millions).

(d) Adjustment to remove Nationstar’s historical goodwill of $71 million and to record bargain purchase gain associated with the merger of $100 million, as shown in Note 3, Preliminary Purchase Price Allocation, in retained earnings.

(e) Reflects the estimated reduction of WMIH’s valuation allowance against its deferred tax assets of $1,015 million. As required by Accounting Standards Codification 740, Income Taxes, a company is required to evaluate the four sources of income to estimate the realizability of all the deferred tax assets. When using forecasted income to support the realization of the deferred tax assets, the forecasted earnings should be objectively verifiable. Management considered its most recent historical income, as well as 2018 projected income, which considers the 2017 growth in the servicing portfolio, along with business growth and cost savings initiatives, which were not fully reflected in 2017 results. The 2018 projected income was then adjusted for the incremental cost of debt and used to forecast future year income, which resulted in an estimated $1,015 million release of the valuation allowance. The income tax benefit of the estimated $1,015 million reduction in the valuation allowance is not reflected in the pro forma statement of operations because it will not have a continuing impact. The remaining valuation allowance will be re-evaluated periodically.

(f) Represents the following income tax effects of the pro forma adjustments in connection with the merger.

(g) Reflects the new debt incurred by WMIH to finance the merger, minus the effects of extinguishing assumed outstanding unsecured senior notes upon completion of the merger. The net increase to unsecured senior notes includes (amounts in millions):

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(h) Represents the following pro forma payables and accrued liabilities adjustments in connection with the merger:

(i) Reflects WMIH’s shares to be issued upon Series B conversion, warrant exercise, Series A conversions and accelerated vesting of equity awards.

(j) Represents elimination of the historical equity of Nationstar.

(k) Represents the following pro forma related expenses expected to be incurred in connection with the merger. The pro forma statement of income does not include these pro forma relates expense because the expenses will not have a continuing impact on operations; however, the amounts are reflected as a reduction to the retained earnings in the unaudited pro forma balance sheet.

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(l) Represents the elimination of $8 million and $6 million nonrecurring transaction costs incurred that are directly related to the merger for the three months ended March 31, 2018 and the year ended December 31, 2017, respectively.

(m) Represents the net increase to interest expense resulting from interest on the new unsecured senior note to finance the merger and the amortization of related debt issuance costs, as follows (amounts in millions).

(n) Represents the increase in the weighted average shares with the issuance of WMIH common stock in connection with the merger.

(o) Elimination of WMIH’s preferred stock dividend for the year ended December 31, 2017.

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