Exhibit 99.1

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

The following unaudited pro forma condensed combined financial statements are based on the separate historical financial statements of United Bankshares, Inc. (“United Bankshares”) and Virginia Commerce Bancorp, Inc. (“Virginia Commerce”) after giving effect to the merger, the issuance of United common stock in connection therewith and the other transactions contemplated by the Agreement and Plan of Merger dated as of January 29, 2013 by and between United Bankshares and Virginia Commerce, as supplemented by the Supplement for Merger Sub Accession to Agreement and Plan of Reorganization dated May 30, 2013 by and among United Bankshares, Virginia Commerce and George Mason Bankshares, Inc. (“George Mason”), including but not limited to the cash redemption of Virginia Commerce’s Troubled Asset Relief Program (“TARP”) warrant held by the U.S. Department of the Treasury (the “Treasury”) and issued by Virginia Commerce in connection with the TARP Capital Purchase Program (the “TARP warrant”) in the amount of $33.263 million.

The unaudited pro forma condensed combined balance sheet as of September 30, 2013 is presented as if the merger with Virginia Commerce and the transactions that occurred therewith had occurred on September 30, 2013. The unaudited pro forma condensed combined income statements for the year ended December 31, 2012 and the nine months ended September 30, 2013 are presented as if the merger and transactions that occurred therewith had occurred on January 1, 2012. The historical consolidated financial information has been adjusted to reflect factually supportable items that are directly attributable to the merger and, with respect to the income statements only, expected to have a continuing impact on consolidated results of operations.

The unaudited pro forma condensed combined financial information has been prepared using the acquisition method of accounting for business combinations under accounting principles generally accepted in the United States. United Bankshares is the acquirer for accounting purposes. United Bankshares has not had sufficient time to completely evaluate the fair value of the assets and liabilities as well identifiable intangible assets of Virginia Commerce. Accordingly, the unaudited pro forma adjustments, including the allocations of the purchase price, are preliminary and have been made solely for the purpose of providing unaudited pro forma condensed combined financial information.

A final determination of the acquisition consideration and fair values of Virginia Commerce’s assets and liabilities will be based on the actual net tangible and intangible assets of Virginia Commerce that existed as of the date of completion of the merger, which was after the close of business on January 31, 2014. Consequently, amounts preliminarily allocated to all assets and liabilities, goodwill and identifiable intangibles could change from those allocations used in the unaudited pro forma condensed combined financial statements presented and could result in a change in amortization of acquired intangible assets and amortization or accretion of other fair value adjustments.

In connection with the plan to integrate the operations of United Bankshares and Virginia Commerce, United Bankshares will incur nonrecurring charges, such as costs associated with systems implementation, severance and other costs related to exit or disposal activities. United Bankshares is not fully able to determine the timing, nature and amount of these charges as of the date of this filing. However, these charges will affect the results of operations of United Bankshares and Virginia Commerce upon the completion of the merger, in the period in which they are incurred. The unaudited pro forma condensed combined financial statements do not include the effects of the costs associated with any restructuring or integration activities resulting from the transaction, as they are nonrecurring in nature and were not factually supportable at the time that the unaudited pro forma condensed combined financial statements were prepared. Additionally, the unaudited pro forma adjustments do not give effect to any nonrecurring or unusual restructuring charges that may be incurred as a result of the integration of the two companies or any anticipated disposition of assets that may result from such integration.

The unaudited pro forma condensed combined financial statements are provided for informational purposes only. The unaudited pro forma condensed combined financial statements are not necessarily, and should not be assumed to be, an indication of the results that would have been achieved had the transaction been completed as of the dates indicated or that may be achieved in the future. The preparation of the unaudited pro forma condensed combined financial statements and related adjustments required management to make certain assumptions and estimates. The unaudited pro forma condensed combined financial statements should be read together with:

UNITED BANKSHARES, INC.

SELECTED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION (UNAUDITED)

(Dollars in thousands)

PRO FORMA CONDENSED BALANCE SHEET (UNAUDITED)

UNITED BANKSHARES, INC.

As of September 30, 2013

See notes to the unaudited pro forma condensed combined financial information.

PRO FORMA CONDENSED INCOME STATEMENT (UNAUDITED)

UNITED BANKSHARES, INC.

For the Nine Months Ended September 30, 2013

See notes to the unaudited pro forma condensed combined financial information.

PRO FORMA CONDENSED INCOME STATEMENT (UNAUDITED)

UNITED BANKSHARES, INC.

For the Year Ended December 31, 2012

See notes to the unaudited pro forma condensed combined financial information.

NOTE A – BASIS OF PRESENTATION

After the close of business on January 31, 2014, United Bankshares consummated its merger with Virginia Commerce. Virginia Commerce was merged with and into George Mason, a wholly-owned subsidiary of United Bankshares. At the effective time of the merger, Virginia Commerce ceased to exist and George Mason survived and will continue to exist as a Virginia corporation.

At the effective time of the merger, each outstanding share of common stock of Virginia Commerce was converted into the right to receive 0.5442 shares of United Bankshares common stock, par value $2.50 per share, and Virginia Commerce’s outstanding stock options were converted into options to purchase United Bankshares common stock. As a result of the merger, United issued approximately 18.3 million shares of its common stock for all of Virginia Commerce’s outstanding common stock and restricted stock, and issued options to purchase approximately 441 thousand shares of its common stock upon conversion of Virginia Commerce’s stock options. United paid approximately $8 thousand in cash to holders of Virginia Commerce common stock and restricted stock in lieu of fractional shares of United common stock. The payment of cash in lieu of fractional shares was funded by cash on hand at United. In addition, United Bankshares repurchased the TARP warrant held by the Treasury and issued by Virginia Commerce in connection with the TARP Capital Purchase Program for a purchase price of $33.263 million.

After the effective time of the merger, Virginia Commerce Bank, a wholly-owned subsidiary of Virginia Commerce, was merged with and into United Bank (Virginia), a wholly-owned subsidiary of George Mason. United Bank (Virginia) survived the bank merger and will continue to exist as a Virginia banking corporation.

The unaudited pro forma condensed combined financial information of United Bankshares’ financial condition and results of operations, including per share data, are presented after giving effect to the merger. The pro forma financial information assumes that the merger with Virginia Commerce was consummated on January 1, 2012 for purposes of the unaudited pro forma condensed combined statement of income and on September 30, 2013 for purposes of the pro forma balance sheet and gives effect to the merger, for purposes of the unaudited pro forma condensed combined statement of income, as if it had been effective during the entire period presented.

The merger will be accounted for using the acquisition method of accounting; accordingly, the difference between the purchase price over the estimated fair value of the assets acquired (including identifiable intangible assets) and liabilities assumed will be recorded as goodwill.

The pro forma financial information includes estimated adjustments to record the assets and liabilities of Virginia Commerce at their respective fair values and represents management’s estimates based on available information. The pro forma adjustments included herein will likely be revised as additional information becomes available and as additional analysis is performed. The final allocation of the purchase price will be determined after completion of a final analysis to determine the fair values of Virginia Commerce’s tangible and identifiable intangible assets and liabilities as of the closing date and any differences could be material.

NOTE B – PRO FORMA ADJUSTMENTS

(In thousands, except share data)

The following pro forma adjustments have been reflected in the unaudited pro forma condensed combined financial information. All adjustments are based on current valuations, estimates and assumptions that are subject to change and such change could be material.

NOTE C – TARP CAPITAL PURCHASE PROGRAM WARRANT

On December 12, 2008, Virginia Commerce entered into a letter agreement with the Treasury under the TARP Capital Purchase Program, whereby Virginia Commerce issued and sold to the Treasury 71,000 shares of fixed rate cumulative perpetual preferred stock with a par value of $1.00 and a liquidation amount of $1,000 per share, for a total price of $71.0 million. In addition, the Treasury received a warrant to purchase 2,696,203 shares of the Virginia Commerce’s common stock at an exercise price of $3.95 per share. Virginia Commerce accrued and paid dividends quarterly, beginning February 2009, at a rate of 5% per year for the first five years, then would have increased to 9% thereafter.

On December 11, 2012, Virginia Commerce repurchased all of its preferred stock that was issued to the Treasury under the TARP Capital Purchase Program. Pursuant to the redemption, the Treasury received from Virginia Commerce $71.3 million, consisting of $71.0 million in liquidation value of the preferred stock and approximately $256 thousand in accrued and unpaid dividends for the fourth quarter of 2012.

On January 31, 2014, United Bankshares repurchased the TARP warrant held by the Treasury and issued by Virginia Commerce in connection with the TARP Capital Purchase Program for a purchase price of $33.263 million.

NOTE D – PRO FORMA ALLOCATION OF PURCHASE PRICE

The following table shows the pro forma allocation of the consideration paid for Virginia Commerce’s common equity to the acquired identifiable assets and liabilities assumed and the pro forma goodwill generated from the transaction:

NOTE E – ESTIMATED AMORTIZATION/ACCRETION OF ACQUISITION ACCOUNTING ADJUSTMENTS

The following table sets forth an estimate of the expected effects of the estimated aggregate acquisition accounting adjustments reflected in the pro forma combined financial statements on the future pre-tax net income of United Bankshares after the merger with Virginia Commerce:

The actual effect of purchase accounting adjustments on the future pre-tax income of United Bankshares will differ from these estimates based on the closing date estimates of fair values and the use of different amortization methods than assumed above.

NOTE F– ESTIMATED COST SAVINGS AND MERGER-RELATED COSTS

Estimated cost savings, expected to approximate 25% of Virginia Commerce’s annualized pre-tax operating expenses, are excluded from the pro forma analysis. Cost savings are estimated to be realized at 50% in the first year after acquisition and 100% in subsequent years. In addition, estimated merger-related costs are not included in the pro forma combined statements of income since they will be recorded in the combined results of income as they are incurred prior to or after completion of the merger and not indicative of what historical results of the combined company would have been had the companies been actually combined during the periods presented. Merger-related costs are estimated to be approximately $16 million, before-tax.