SUMMARY

This summary highlights selected information from this proxy statement/prospectus and may not contain all of the information that is important to you. The merger agreement is attached to this proxy statement/prospectus as Annex A. To fully understand the merger and for a more complete description of the terms of the merger, you should carefully read this entire document, including the exhibits, and the documents we refer you to under the caption “Where You Can Find More Information About WesBanco and Fidelity” beginning on page [ — ]. This proxy statement/prospectus, including information included or incorporated by reference in this proxy statement/prospectus, contains a number of forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 regarding the financial condition, results of operations, earnings outlook, business and prospects of WesBanco and Fidelity, and the potential combined company, as well as statements applicable to the period following the completion of the merger. You can find some of these statements by looking for words such as “plan,” “believe,” “expect,” “intend,” “anticipate,” “estimate,” “project,” “potential,” “possible” or other similar expressions. These forward-looking statements involve certain risks and uncertainties. The ability of either WesBanco or Fidelity to predict results or the actual effects of our plans and strategies, particularly after the merger, is inherently uncertain. Because these forward-looking statements are subject to assumptions and uncertainties, actual results may differ materially from those expressed in or implied by these forward-looking statements. See “Cautionary Statement Regarding Forward-Looking Statements” on page [ — ].

The Merger (See page [ — ])

We propose a merger of Fidelity with and into WesBanco. If the merger is consummated, WesBanco will continue as the surviving corporation. The articles of incorporation and bylaws of WesBanco will continue as the articles of incorporation and bylaws of the surviving corporation until amended or repealed in accordance with applicable law. The officers and directors of WesBanco will continue as the officers and directors of the surviving corporation, except that Richard G, Spencer, President and Chief Executive Officer of Fidelity, will be appointed to the board of directors of WesBanco.

The Companies (See page [ — ])

WesBanco, Inc.

One Bank Plaza

Wheeling, West Virginia 26003

(304) 234-9000

WesBanco, a bank holding company headquartered in Wheeling, West Virginia, offers through its various subsidiaries a full range of financial services including retail banking, corporate banking, personal and corporate trust services, brokerage services, mortgage banking and insurance. WesBanco’s banking subsidiary WesBanco Bank, Inc., operates 112 banking offices in West Virginia, Ohio and Pennsylvania. As of June 30, 2012, WesBanco had approximately $5.5 billion of consolidated total assets, $4.4 billion of deposits and $649 million of shareholders’ equity.

Fidelity Bancorp, Inc.

1009 Perry Highway

Pittsburgh, Pennsylvania 15237

(412) 367-3300

Fidelity is a bank holding company headquartered in Pittsburgh, Pennsylvania. Fidelity was incorporated in 1992 under Pennsylvania law for the purpose of becoming the holding company for Fidelity Savings Bank, a Pennsylvania state-chartered stock savings bank operating under the name “Fidelity Bank, PaSB”. Fidelity

Savings Bank, incorporated in 1927, conducts business from thirteen full service offices located in Allegheny and Butler counties, two of the seven Pennsylvania counties which comprise the metropolitan and suburban areas of greater Pittsburgh. Through Fidelity Savings Bank, Fidelity is engaged in the business of commercial banking and other permissible activities closely related to banking. At June 30, 2012, Fidelity had total assets of $665.6 million, total deposits of $469.3 million and shareholders’ equity of $52.7 million.

What Fidelity Shareholders Will Receive in the Merger (See page [ — ])

If the merger is completed, for each share of Fidelity common stock that you own you will receive, (i) 0.8275 shares of WesBanco common stock and (ii) $4.50 in cash, without interest, subject to possible adjustment in accordance with the terms of the merger agreement as discussed below. Collectively, we refer to the $4.50 in cash and 0.8275 shares of WesBanco common stock to be received as the “merger consideration.” Instead of fractional shares of WesBanco, you will receive a check for any fractional shares based on a value of $18.00 per whole share of WesBanco common stock. You will not receive separate consideration for the preferred stock purchase rights associated with the Fidelity common stock issued pursuant to the Fidelity Rights Agreement, dated as of March 31, 2003, as amended by amendment No. 1 to Rights Agreement, dated as of March 15, 2005, and Amendment No. 2 to Rights Agreement, dated as of July 19, 2012 (the “Rights Agreement”), as such purchase rights will expire immediately prior to the effective time of the merger.

The 0.8275 exchange ratio is subject to adjustment if certain termination provisions, based on the market price of WesBanco’s common stock, have been triggered and the Fidelity board of directors elects to terminate the merger agreement. Fidelity will have a right to terminate the merger agreement if the average closing price of WesBanco common stock during a specified period before the effective time of the merger is less than $18.85 per share and WesBanco common stock underperforms an index of financial institution stocks by more than 15%. However, Fidelity would not have the right to terminate the merger agreement if WesBanco were to elect to make a compensating adjustment in the exchange ratio. See “Proposal No. 1 — Proposal to Adopt the Merger Agreement — Termination of the Merger Agreement” beginning on page [ — ]. The exchange ratio is also subject to adjustment if WesBanco completes certain corporate transactions, such as a reorganization, recapitalization, reclassification, stock dividend, stock split, reverse stock split or other like changes in WesBanco’s capitalization.

Fidelity’s Reasons for the Merger and Recommendation to Shareholders (See page [ — ])

The Fidelity board of directors has unanimously determined that the merger agreement and the merger are in the best interests of Fidelity and its shareholders, and accordingly unanimously approved the merger agreement and recommends that Fidelity shareholders vote “FOR” the adoption of the merger agreement.

In determining whether to approve the merger agreement and recommend adoption of the merger agreement to the Fidelity shareholders, Fidelity’s board considered the factors described under “Proposal No. 1 — Proposal to Adopt the Merger Agreement — Fidelity’s Reasons for the Merger.”

Opinions of Financial Advisors (See page [ — ])

Fidelity. Mufson Howe Hunter & Company LLC (“MHH”) delivered its opinion to the board of directors of Fidelity on July 19, 2012 that, based upon and subject to the factors and assumptions set forth in the opinion, the merger consideration to be received by the holders of shares of Fidelity’s common stock in the merger pursuant to the merger agreement was fair to such holders, from a financial point of view as of that date.

The full text of the written opinion of MHH, dated July 19, 2012, which sets forth the assumptions made, procedures followed, matters considered and limitations on the review undertaken in connection with the

opinion, is attached as Annex B to this proxy statement/prospectus. Fidelity’s shareholders should read the opinion in its entirety. MHH provided its opinion for the information and assistance of the board of Fidelity in connection with the board’s consideration of the merger. MHH’s opinion is not a recommendation as to how any Fidelity shareholder should vote with respect to the merger. See “Proposal No. 1 — Proposal to Adopt the Merger Agreement – Opinion of Fidelity’s Financial Advisor” beginning on page [ — ] for a description of MHH’s fairness opinion and a summary of the analyses performed by MHH in connection with its opinion.

WesBanco. WesBanco asked its financial advisor, Macquarie Capital (USA) Inc. (“Macquarie”), for advice on the fairness to WesBanco of the merger consideration that WesBanco is offering in the merger. Macquarie rendered a written opinion to the WesBanco board of directors that, as of July 19, 2012, and based upon and subject to the factors and assumptions set forth therein, the merger consideration to be paid by WesBanco pursuant to the merger agreement was fair from a financial point of view to WesBanco. See “Proposal No. 1 — Proposal to Adopt the Merger Agreement — Opinion of WesBanco’s Financial Advisor” beginning on page [ — ]. This opinion, which is attached to this document as Annex C, sets forth the procedures followed, assumptions made and limitations on the review undertaken by Macquarie in providing its opinion.

Treatment of Fidelity Stock Options (See page [ — ])

Upon completion of the merger, each outstanding option to purchase shares of Fidelity common stock, whether or not then exercisable, will be cancelled in exchange for the right to receive an amount in cash, without interest, equal to the product of (i) the aggregate number of shares of Fidelity common stock subject to such stock option, multiplied by (ii) the excess, if any, of $22.50 over the per share exercise price of such Fidelity stock option. The cash payment will be subject to applicable tax withholding.

Treatment of Fidelity Restricted Stock (See page [ — ])

Upon completion of the merger, each outstanding share of Fidelity restricted stock that is outstanding immediately prior to the completion of the merger, will vest in full immediately and will be converted into the right to receive $22.50 per share, without interest, subject to applicable tax withholding. Notwithstanding the previous sentence, if any shares of Fidelity TARP Preferred Stock are held by the U.S. Treasury at the time of completion of the merger, then the 5,647 shares of Fidelity restricted stock held by Richard G. Spencer (the “Converted Restricted Stock”) shall not become entitled to receive the consideration set forth in the preceding sentence. Instead, each share of Converted Restricted Stock shall be converted into the right to acquire the number of shares of WesBanco common stock, determined by multiplying the number of shares of Converted Restricted Stock immediately prior to completion of the merger by the sum of (i) the exchange ratio and (ii) 0.2033 (rounded down, if necessary, to a whole share of WesBanco common stock).

Treatment of Fidelity TARP Preferred Stock and Fidelity TARP Warrant (See page [ — ])

The merger agreement provides that upon completion of the merger, each outstanding share of Fidelity TARP Preferred Stock, will be converted into the right to receive one share of WesBanco Fixed Rate Cumulative Perpetual Preferred Stock, Series B (“WesBanco Preferred Stock”) with substantially the same rights, powers and preferences as the Fidelity TARP Preferred Stock, unless purchased or redeemed prior to the effective time of the merger. The outstanding warrant, (the “Fidelity TARP Warrant”), to purchase Fidelity common stock, which was issued on December 12, 2008 to the U.S. Treasury, will be converted into a warrant to purchase WesBanco common stock, subject to appropriate adjustments to reflect the exchange ratio. Subject to the receipt of requisite regulatory approvals, WesBanco and Fidelity have agreed to use their reasonable best efforts to have the Fidelity TARP Preferred Stock either purchased by WesBanco or one of its subsidiaries, in which case it is expected to be extinguished upon consummation of the merger, or redeemed by Fidelity. WesBanco also may elect to have the Fidelity TARP Warrant purchased or redeemed, but has no obligation to do so. There can be no certainty or guarantee as to the timing or occurrence of the redemption or repurchase of either the Fidelity TARP Preferred Stock or the Fidelity TARP Warrant.

Special Meeting (See page [ — ])

A special meeting of Fidelity’s shareholders will be held at [ — ], on [ — ] 2012, at [ — ] Eastern Time. At the special meeting, Fidelity shareholders will be asked to: (i) adopt the merger agreement; (ii) approve, in a non-binding advisory vote, the compensation payable to the named executive officers of Fidelity in connection with the merger; and (iii) approve an adjournment of the Fidelity special meeting, if necessary, to solicit additional proxies if there are not sufficient votes to adopt the merger agreement at the time of the Fidelity special meeting.

Record Date; Voting Power (See page [ — ])

You may vote at the special meeting only if you owned shares of Fidelity common stock at the close of business on [ — ], 2012, referred to as the record date. On the record date, there were [ — ] shares of Fidelity common stock outstanding. You may cast one vote for each share of Fidelity common stock owned by you on the record date. You can vote your shares by telephone, the Internet or by returning the enclosed proxy by mail, or you may vote in person by appearing at the special meeting. You can change your vote as late as the date of the special meeting either by submitting a later-dated proxy by telephone, the Internet or by mail, that is received prior to the special meeting or by attending the special meeting and voting in person. Holders of Fidelity TARP Preferred Stock will not have the right to vote on any of the proposals at the Fidelity special meeting.

Vote Required (See page [ — ])

The affirmative vote of a majority of the votes cast at the Fidelity special meeting at which a quorum is present by holders of Fidelity common stock entitled to vote is required to (i) adopt the merger agreement; (ii) approve, in a non-binding advisory vote, the compensation payable to the named executive officers of Fidelity in connection with the merger; and (iii) approve the adjournment of the Fidelity special meeting, if necessary, to solicit additional proxies if there are not sufficient votes to adopt the merger agreement at the time of the Fidelity special meeting. As of the record date, the directors and executive officers of Fidelity controlled approximately [ — ]% of the outstanding shares of Fidelity common stock entitled to vote at the special meeting. In addition, certain officers and directors of Fidelity have entered into voting agreements with WesBanco wherein the officer or director has agreed to vote their Fidelity shares in favor of adoption of the merger agreement. A vote by the holders of the Fidelity TARP Preferred Stock is not required to approve any of the proposals to be voted on at the Fidelity special meeting

Voting Agreements (See page [ — ])

In connection with the merger agreement, WesBanco entered into voting agreements with certain Fidelity directors and officers, consisting of Richard G. Spencer, Christopher S. Green, Robert F. Kastelic, Oliver D. Keefer, Donald J. Huber, J. Robert Gales, Michael A. Mooney, Lisa L. Griffith, Sandra L. Lee, Anthony F. Rocco and Richard L. Barron. In the voting agreements, each of these shareholders has generally agreed to vote all of his or her shares of Fidelity common stock in favor of adoption of the merger agreement. As of the record date, there were [ — ] shares of Fidelity common stock subject to the voting agreements, which represent approximately [ — ]% of the outstanding shares of Fidelity common stock as of that date.

Quorum; Abstentions and Broker Non-Votes (See page [ — ])

A quorum must be present to transact business at the Fidelity special meeting. If you submit a properly executed proxy card, even if you abstain from voting, your shares will be counted for purposes of calculating whether a quorum is present at the Fidelity special meeting. A quorum at the Fidelity special meeting requires the presence, whether in person or by proxy, of a majority of the outstanding shares of Fidelity common stock as of the record date.

Shares held in street name by brokers and other record holders but not voted at the special meeting because such brokers have not received voting instructions from the underlying owners are called broker non-votes. An abstention occurs when a shareholder attends a meeting, either in person or by proxy, but abstains from voting. If no instruction as to how to vote is given (including an instruction to abstain) in an executed, duly returned and not revoked proxy, the proxy will be voted for (i) adoption of the merger agreement, (ii) approval, in a non-binding advisory vote, of the compensation payable to the named executive officers of Fidelity in connection with the merger; and (iii) approval of the adjournment of the Fidelity special meeting, if necessary, to solicit additional proxies if there are not sufficient votes to adopt the merger agreement at the time of the Fidelity special meeting.

At the Fidelity special meeting, abstentions and broker non-votes will be counted in determining whether a quorum is present. However, abstentions, broker non-votes and a complete failure to vote will have no effect on the outcome of any of the proposals being voted on by Fidelity shareholders.

Dissenter’s Rights for Fidelity TARP Preferred Stock Holders Only (See page [ — ])

Under Pennsylvania law, holders of Fidelity common stock will not be entitled to dissenters’ appraisal rights. Therefore, if you own shares of Fidelity common stock on the record date but you are against the merger, you may vote against adoption of the merger agreement but you may not exercise dissenter’s rights for your shares. The holders of the Fidelity TARP Preferred Stock will not be entitled to vote on any of the proposals at the special meeting. However, under Pennsylvania law, because the holders of the Fidelity TARP Preferred Stock are not entitled to vote with respect to shares of the Fidelity TARP Preferred Stock, those holders will be given dissenter’s rights with respect to those shares of Fidelity TARP Preferred Stock.

Ownership of WesBanco after the Merger (See page [ — ])

WesBanco will issue a maximum of approximately [ — ] shares of its common stock to Fidelity shareholders in connection with the merger, based on the number of shares of Fidelity common stock outstanding on the record date and assuming no adjustment to the exchange ratio is made, which, assuming that WesBanco issues that maximum number of shares, would constitute approximately [ — ] % of the outstanding stock of WesBanco after the merger, based on the number of shares of WesBanco common stock outstanding on [ — ], 2012. The shares will be listed for trading on the Nasdaq Global Select Market. WesBanco common stock is traded on the Nasdaq Global Select Market under the symbol “WSBC.”

Material U.S. Federal Income Tax Consequences (See page [ — ])

It is a condition to the completion of the merger, unless waived by the parties in writing, that each of WesBanco and Fidelity receives a legal opinion from their respective tax counsel to the effect that the merger will be treated as a “reorganization” for United States federal income tax purposes within the meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended (the “Code”). Accordingly, we expect the merger generally to be tax-free to Fidelity shareholders for United States federal income tax purposes to the extent that they receive WesBanco common stock pursuant to the merger. If the merger does not qualify as a “reorganization,” the holders of Fidelity common stock generally will be required to recognize gain or loss measured by the difference between the fair market value of the WesBanco common stock plus cash received by such holders in the transaction and the adjusted tax basis in their Fidelity common stock surrendered in the transaction. If the merger qualifies as a “reorganization,” Fidelity shareholders will not recognize gain or loss for United States federal income tax purposes with respect to the exchange of Fidelity common stock for WesBanco common stock. Fidelity shareholders may recognize gain, but not loss, with respect to Fidelity common stock exchanged for cash. In addition, Fidelity shareholders will recognize gain or loss with respect to the receipt of cash in lieu of fractional shares.

You should read the summary under the caption “Proposal No. 1 — Proposal to Adopt the Merger Agreement — Material U.S. Federal Income Tax Consequences of the Merger” beginning on page [ — ] for a more complete discussion of the federal income tax consequences of the merger. You should also consult your own tax advisor concerning all federal, state, local and foreign tax consequences of the merger that may apply to you.

Certain Differences in the Rights of Shareholders (See page [ — ])

Fidelity is a Pennsylvania corporation governed by Pennsylvania law and WesBanco is a West Virginia corporation governed by West Virginia law. Once the merger occurs, Fidelity shareholders will become shareholders of WesBanco and their rights will be governed by West Virginia law and WesBanco’s corporate governing documents rather than Pennsylvania law and Fidelity’s governing documents. Because of the differences between the laws of the Commonwealth of Pennsylvania and the State of West Virginia and the respective corporate governing documents of Fidelity and WesBanco, Fidelity’s shareholders’ rights as shareholders will change as a result of the merger. These include, among others, differences in shareholders’ rights related to notice and adjournment of shareholder meetings, the calling of special meetings of shareholders, dissenters’ rights, the number and term of directors, nomination of directors, removal of directors and filling vacancies on the board of directors, cumulative voting, indemnification of officers and directors, amendment of articles of incorporation and bylaws, required voting for extraordinary corporate transactions, Fidelity’s shareholder rights agreement, and statutory provisions affecting control share acquisitions and business combinations.

Conditions to the Merger (See page [ — ])

Completion of the merger is subject to the satisfaction or waiver of the conditions specified in the merger agreement, including, among others, those listed below:

Termination of the Merger Agreement (See page [ — ])

The parties can agree to terminate the merger agreement at any time prior to completion of the merger, and either Fidelity or WesBanco can terminate the merger agreement if, among other reasons, any of the following occurs:

Fidelity will also have the right to terminate the merger agreement if the average closing price of WesBanco common stock during a specified period before the effective time of the merger is less than $18.85 and WesBanco common stock underperforms an index of financial institutions by more than 15%, unless WesBanco were to elect to make a compensating adjustment to the exchange ratio. Subject to certain conditions, Fidelity may also terminate the merger agreement in order to enter into an agreement with respect to an unsolicited proposal that if consummated would be reasonably likely to result in a transaction more favorable to Fidelity’s shareholders from a financial point of view, provided that Fidelity pays the termination fee described below upon entering into such agreement.

Termination Fee (See page [ — ])

The merger agreement provides that in certain circumstances, described more fully beginning on page [ — ], Fidelity will be required to pay a termination fee of $3.2 million to WesBanco.

We May Amend the Terms of the Merger and Waive Rights Under the Merger Agreement (See page [ — ])

We may jointly amend the terms of the merger agreement, and either party may waive its right to require the other party to adhere to any of those terms, to the extent legally permissible. However, after the approval of the merger agreement by the Fidelity shareholders, there may not be, without further approval of Fidelity’s shareholders, any amendment of the merger agreement that requires such further approval under applicable law or would alter the amount or kind of the WesBanco common stock portion of the merger consideration to be received by Fidelity shareholders.

Effective Date of the Merger (See page [ — ])

We expect the merger to be completed as soon as practicable after all regulatory approvals and shareholder approval have been received. We expect this to occur by December 31, 2012.

Regulatory Approvals (See page [ — ])

In addition to your approval, the merger is subject to the approval of the Federal Deposit Insurance Corporation, Board of Governors of the Federal Reserve System (unless a waiver is granted), the West Virginia Division of Financial Institutions and the Pennsylvania Department of Banking. These governmental authorities may impose conditions for granting approval of the merger.

Fidelity and WesBanco have filed all required applications for regulatory review and approval and notices in connection with the merger. Neither Fidelity nor WesBanco can offer any assurance that all necessary approvals will be obtained or the date when any such approvals will be obtained.

Interests of Certain Persons in the Merger (See page [ — ])

Some of the directors and officers of Fidelity have financial and other interests in the merger that differ from, or are in addition to, their interests as shareholders of Fidelity. These interests include, but are not limited to:

The Fidelity and WesBanco boards of directors knew about these additional interests, and considered them, when each board adopted the merger agreement. See “Proposal No. 1 — Proposal to Adopt the Merger Agreement — Interests of Certain Persons in the Merger” beginning on page [ — ] for more detailed information about these interests.

Ownership of Common Stock by Fidelity Directors, Executive Officers and Affiliates (See page [ — ])

As of the record date, the directors, executive officers and affiliates of Fidelity owned or controlled the vote of [ — ] shares of Fidelity common stock constituting approximately [ — ]% of the outstanding shares of Fidelity common stock. In addition, certain officers and directors of Fidelity have entered into voting agreements with WesBanco wherein the officer or director has agreed to vote their Fidelity shares in favor of adoption of the merger. See “Other Material Agreements Relating to the Merger — Voting Agreements.”

Advisory (Non-binding) Vote on Golden Parachute Compensation (See page [ — ])

In accordance with Securities and Exchange Commission (“SEC”) rules, Fidelity is providing shareholders with the opportunity to vote to approve on an advisory (non-binding) basis, certain payments that will or may be made to Fidelity’s named executive officers in connection with the merger, as reported in the Summary of Golden Parachute Arrangements table on page [ — ] and the associated narrative discussion.

Adjournment Proposal (See page [ — ])

You are being asked to approve a proposal to grant our board of directors discretionary authority to adjourn our special meeting, if necessary, to solicit additional proxies from our shareholders for the merger proposal in the event a quorum is present at our special meeting but there are insufficient votes to adopt the merger agreement.

Our Recommendations (See page [ — ])

The Fidelity board of directors determined that the merger is in the best interests of Fidelity shareholders. Accordingly, it has unanimously recommended that Fidelity shareholders vote “FOR” the proposal to adopt the merger agreement. See “Proposal No. 1 — Proposal to Adopt the Merger Agreement — Background of the Merger” at page [ — ]. In addition the Fidelity board of directors unanimously recommends that you vote “FOR” the proposal to approve, in a non-binding, advisory vote, the compensation payable to the named executive officers of Fidelity in connection with the merger and “FOR” the proposal to adjourn the Fidelity special meeting if necessary to solicit additional proxies in favor of the adoption of the merger agreement.