EX-4.1

The following summary of certain provisions of the Company’s securities does not purport to be complete and is subject to the Certificate of Incorporation, the Bylaws and the provisions of applicable law.

The total amount of our authorized share capital consists of 5,000,000,000 shares of common stock and 100,000,000 shares of preferred stock. The following summary describes all material provisions of our capital stock.

Voting rights. Each holder of common stock is entitled to one (1) vote for each share of common stock held of record by such holder on all matters voted upon by our stockholders, provided, however, that, except as otherwise required in the Certificate of Incorporation or by applicable law, the holders of common stock are not entitled to vote on any amendment to the Certificate of Incorporation that alters or changes the powers, preferences, rights or other terms of one or more outstanding series of preferred stock if the holders of such affected series are entitled, either separately or together with the holders of one or more other such series, to vote thereon pursuant to the Certificate of Incorporation (including any certificate of designation relating to any series of preferred stock) or pursuant to the Delaware General Corporation Law (the “DGCL”).

Dividend rights. Subject to any other provisions of the Certificate of Incorporation, as it may be amended from time to time, holders of common stock are entitled to receive such dividends and other distributions in cash, stock or property of the Company when, as and if declared thereon by the board, in its discretion, from time to time out of assets or funds of the Company legally available therefor.

Rights upon liquidation. Subject to the rights of holders of preferred stock, in the event of any liquidation, dissolution or winding up of our affairs, whether voluntary or involuntary, after payment or provision for payment of our debts and any other payments required by law and amounts payable upon shares of preferred stock ranking senior to the shares of common stock upon such dissolution, liquidation or winding up, if any, the Company’s remaining net assets will be distributed to the holders of common stock and the holders of any other class or series of capital stock ranking equally with the common stock upon such dissolution, liquidation or winding up, equally on a per share basis.

Other rights. No holder of common stock is entitled to preemptive or subscription rights contained in the Certificate of Incorporation or in the Bylaws. There are no redemption or sinking fund provisions applicable to the common stock. The rights, preferences and privileges of holders of the common stock will be subject to those of the holders of the preferred stock that the Company may issue in the future.

The board has the authority to issue shares of preferred stock from time to time on terms it may determine, to divide shares of preferred stock into one or more series and to fix the designations, preferences, privileges, and restrictions of preferred stock, including dividend rights, conversion rights, voting rights, terms of redemption, liquidation preference, sinking fund terms and the number of shares constituting any series or the designation of any series to the fullest extent permitted by the DGCL. The issuance of preferred stock could have the effect of decreasing the trading price of common stock, restricting dividends on the capital stock of the Company, diluting the voting power of the common stock, impairing the liquidation rights of the capital stock of the Company, or delaying or preventing a change in control of the Company.

Subject to the rights of the holders of any series of preferred stock to elect additional directors under specified circumstances and the terms and conditions of the Amended and Restated Registration and Shareholder Rights Agreement, the number of directors of the board shall be fixed solely and exclusively by resolution duly adopted from time to time by the board, but initially consists of nine (9) directors, which are divided into three (3) classes, designated Class I, II and III, respectively, with Class I consisting of three (3) directors, Class II consisting of three (3) directors and Class III consisting of three (3) directors.

Under the Bylaws, at all meetings of stockholders called for the election of directors, a plurality of the votes properly cast will be sufficient to elect such directors to the board.

Except as the DGCL or the Amended and Restated Registration and Shareholder Rights Agreement may otherwise require and subject to the rights, if any, of the holders of any series of preferred stock, in the interim between annual meetings of stockholders or special meetings of stockholders called for the election of directors and/or the removal of one or more directors and the filling of any vacancy in that connection, newly created directorships and any vacancies on the board, including unfilled vacancies resulting from the removal of directors, may be filled only by the affirmative vote of a majority of the remaining directors then in office, although less than a quorum, or by the sole remaining director. All directors will hold office until the expiration of their respective terms of office and until their successors will have been elected and qualified. A director elected or appointed to fill a vacancy resulting from the death, resignation or removal of a director or a newly created directorship will serve for the remainder of the full term of the class of directors in which the new directorship was created or the vacancy occurred and until his or her successor will have been elected and qualified.

Subject to the rights, if any, of the holders of any series of preferred stock, any director may be removed from office only for cause and only by the affirmative vote of the holders of not less than two-thirds of the outstanding voting stock (as defined below) of the Company then entitled to vote generally in the election of directors, voting together as a single class. Any such director proposed to be removed from office is entitled to advance written notice as described in the Certificate of Incorporation. Subject to the terms and conditions of the Amended and Restated Registration and Shareholder Rights Agreement, in case the board or any one or more directors should be so removed, new directors may be elected at the same time for the unexpired portion of the full term of the director or directors so removed.

In addition to the powers and authorities hereinbefore or by statute expressly conferred upon them, the directors are hereby empowered to exercise all such powers and do all such acts and things as may be exercised or done by the Company, subject, nevertheless, to the provisions of the DGCL, the Certificate of Incorporation and to any Bylaws adopted and in effect from time to time; provided, however, that no Bylaw so adopted will invalidate any prior act of the directors which would have been valid if such Bylaw had not been adopted.

Notwithstanding the foregoing provisions, any director elected pursuant to the right, if any, of the holders of preferred stock to elect additional directors under specified circumstances will serve for such term or terms and pursuant to such other provisions as specified in the relevant certificate of designations related to the preferred stock.

The holders of a majority of the voting power of the capital stock issued and outstanding and entitled to vote thereat, present in person or represented by proxy, will constitute a quorum at all meetings of the stockholders for the transaction of business except as otherwise required by law or provided by the Certificate of Incorporation. If, however, such quorum will not be present or represented at any meeting of the stockholders, the holders of a majority of the voting power present in person or represented by proxy, have power to adjourn the meeting from time to time, without notice other than announcement at the meeting, until a quorum will be present or represented. At such adjourned meeting at which a quorum will be present or represented, any business may be transacted which might have been transacted at the meeting as originally noticed. If the adjournment is for more than thirty (30) days, or if after the adjournment a new record date is fixed for the adjourned meeting, a notice of the adjourned meeting will be given to each stockholder entitled to vote at such adjourned meeting as of the record date fixed for notice of such adjourned meeting.

The Certificate of Incorporation and the Bylaws contain provisions that may delay, defer or discourage another party from acquiring control of us. We expect that these provisions, which are summarized below, will discourage coercive takeover practices or inadequate takeover bids. These provisions are also designed to encourage persons seeking to acquire control of us to first negotiate with the board of directors, which we believe may result in an improvement of the terms of any such acquisition in favor of our stockholders. However, they also give the board of directors the power to discourage acquisitions that some stockholders may favor.

Delaware law does not require stockholder approval for any issuance of authorized shares. However, the Nasdaq listing requirements, which apply so long as the common stock (or units or warrants) remains listed on The Nasdaq Stock Market LLC, require stockholder approval of certain issuances equal to or exceeding 20% of the then outstanding voting power or then outstanding number of shares of common stock. Additional shares that may be issued in the future may be used for a variety of corporate purposes, including future public offerings, to raise additional capital or to facilitate acquisitions.

One of the effects of the existence of unissued and unreserved common stock may be to enable the board to issue shares to persons friendly to current management, which issuance could render more difficult or discourage an attempt to obtain control of the Company by means of a merger, tender offer, proxy contest or otherwise and thereby protect the continuity of management and possibly deprive stockholders of opportunities to sell their shares of common stock at prices higher than prevailing market prices.

Special Meeting, Action by Written Consent and Advance Notice Requirements for Stockholder Proposals

Unless otherwise required by law, and subject to the rights, if any, of the holders of any series of preferred stock, special meetings of the stockholders of the Company, for any purpose or purposes, may be called only (i) by a majority of the board or (ii) at any time when no annual meeting has been held for a period of thirteen (13) months after the Company’s last annual meeting, a special meeting in lieu thereof may be held, and such special meeting shall have, for the purposes of the Bylaws or otherwise, all the force and effect of an annual meeting. Unless otherwise required by law, written notice of a special meeting of stockholders, stating the time, place and purpose or purposes thereof, shall be given to each stockholder entitled to vote at such meeting, not less than ten (10) or more than sixty (60) days before the date fixed for the meeting. Business transacted at any special meeting of stockholders will be limited to the purposes stated in the notice.

The Bylaws also provide that unless otherwise restricted by the Certificate of Incorporation or the Bylaws, any action required or permitted to be taken at any meeting of the board or of any committee thereof may be taken without a meeting, if all members of the board or of such committee, as the case may be, consent thereto in writing or by electronic transmission, and the writing or writings or electronic transmission or transmissions are filed with the minutes of proceedings of the board or committee.

In addition, the Bylaws require advance notice procedures for stockholder proposals to be brought before an annual meeting of the stockholders, including the nomination of directors. Stockholders at an annual meeting may only consider the proposals specified in the notice of meeting or brought before the meeting by or at the direction of the board of directors, or by a stockholder of record on the record date for the

meeting, who is entitled to vote at the meeting and who has delivered a timely written notice in proper form to our secretary, of the stockholder’s intention to bring such business before the meeting.

These provisions could have the effect of delaying until the next stockholder meeting any stockholder actions, even if they are favored by the holders of a majority of our outstanding voting securities.

The DGCL provides generally that the affirmative vote of a majority of the outstanding stock entitled to vote on amendments to a corporation’s certificate of incorporation or bylaws is required to approve such amendment, unless a corporation’s certificate of incorporation or bylaws, as the case may be, requires a greater percentage.

The Certificate of Incorporation provides that the following provisions therein may be amended, altered, repealed or rescinded only by the affirmative vote of the holders of at least 66-2/3% in voting power of all the then outstanding shares of the Company’s stock entitled to vote thereon and the affirmative vote of at least 66-2/3% of the outstanding shares of each class entitled to vote thereon as a class:

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the provisions regarding the size of the board and the election of directors pursuant to the Amended and Restated Registration and Shareholder Rights Agreement;

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the provisions regarding the limited liability of directors of the Company;

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the provisions regarding competition and corporate opportunities; and

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the provisions regarding the election not to be governed by Section 203 of the DGCL.

The Bylaws may be amended or repealed (A) by the affirmative vote of a majority of the entire board then in office, without the assent or vote of any stockholder (subject to any bylaw requiring the affirmative vote of a larger percentage of the members of the board) or (B) without the approval of the board, by the affirmative vote of the holders of a majority of the outstanding voting stock of the Company entitled to vote on such amendment or repeal, voting as a single class, except for the provisions regarding notice of stockholder business and nominations and special meetings of stockholders, which may be amended or repealed by the affirmative vote of the holders of at least 66-2/3% of the outstanding voting stock of the Company, voting as a single class, and the affirmative vote of the holders of at least 66-2/3% of each class of outstanding voting stock of the Company (provided that if the board recommends that stockholders approve such amendment or repeal at such meeting of stockholders, then such amendment or repeal only requires the affirmative vote of the majority of the outstanding shares of capital stock entitled to vote on such amendment or repeal, voting as a single class).

Section 203 of the DGCL provides that if a person acquires 15% or more of the voting stock of a Delaware corporation, such person becomes an “interested stockholder” and may not engage in certain “business combinations” with the corporation for a period of three years from the time such person acquired 15% or more of the corporation’s voting stock, unless:

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the board of directors approves the acquisition of stock or the merger transaction before the time that the person becomes an interested stockholder;

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the interested stockholder owns at least 85% of the outstanding voting stock of the corporation at the time the merger transaction commences (excluding voting stock owned by directors who are also officers and certain employee stock plans); or

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the merger transaction is approved by the board of directors and at a meeting of stockholders, not by written consent, by the affirmative vote of 2/3 of the outstanding voting stock which is not owned by the interested stockholder. A Delaware corporation may elect in its certificate of incorporation or bylaws not to be governed by this particular Delaware law.

Under the Certificate of Incorporation, the Company opted out of Section 203 of the DGCL and therefore is not subject to Section 203. However, the Certificate of Incorporation contains similar provisions providing that the Company may not engage in certain “business combinations” with any “interested stockholder” for a three-year period following the time that the stockholder became an interested stockholder, unless:

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prior to such time, our board of directors approved either the business combination or the transaction which resulted in the stockholder becoming an interested stockholder;

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upon consummation of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of our voting stock outstanding at the time the transaction commenced, excluding certain shares; or

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at or subsequent to that time, the business combination is approved by our board of directors and by the affirmative vote of holders of at least 66-2/3% of the outstanding voting stock that is not owned by the interested stockholder.

Generally, a “business combination” includes a merger, asset or stock sale or other transaction resulting in a financial benefit to the interested stockholder. Subject to certain exceptions, an “interested stockholder” is a person who, together with that person’s affiliates and associates, owns, or within the previous three years owned, 15% or more of our voting stock.

Under certain circumstances, this provision will make it more difficult for a person who would be an “interested stockholder” to effect various business combinations with a corporation for a three-year period. This provision may encourage companies interested in acquiring our company to negotiate in advance with our board of directors because the heightened stockholder approval requirement would be avoided if our board of directors approves either the business combination or the transaction which results in the stockholder becoming an interested stockholder. These provisions also may have the effect of preventing changes in our board of directors and may make it more difficult to accomplish transactions which stockholders may otherwise deem to be in their best interests.

The Certificate of Incorporation provides that (1) any investment fund affiliated with or managed by Advent International Corporation or any of its affiliates, or any successor, transferee or affiliate thereof, or (2) any person whose ownership of shares in excess of the 15% limitation set forth therein is the result of any action taken solely by the Company (provided, that such person shall be an “interested stockholder” if thereafter such person acquires additional shares of voting stock of the Company, except as a result of further corporate actions not caused by such person) does not constitute “interested stockholders” for purposes of this provision.

The Certificate of Incorporation limits the liability of the directors of the Company to the fullest extent permitted by law, and the Bylaws provide that we will indemnify them to the fullest extent permitted by such law. We have entered and expect to continue to enter into agreements to indemnify our directors, executive officers and other employees as determined by our board of directors. Under the terms of such indemnification agreements, we are required to indemnify each of our directors and officers, to the fullest extent permitted by the laws of the State of Delaware and the Certificated of Incorporation, if the basis of the indemnitee’s involvement was by reason of the fact that the indemnitee is or was a director or officer of the Company or any of its subsidiaries or was serving at the Company’s request in an official capacity for another entity. We must indemnify our officers and directors against all reasonable fees, expenses, charges and other costs of any type or nature whatsoever, including any and all expenses and obligations paid or incurred in connection with investigating, defending, being a witness in, participating in (including on appeal), or preparing to defend, be a witness or participate in any completed, actual, pending or threatened action, suit, claim or proceeding, whether civil, criminal, administrative or investigative, or establishing or enforcing a right to indemnification under the indemnification agreement. The indemnification agreements also require us, if so requested, to advance within ten (10) days of such request all reasonable fees, expenses, charges and other costs that any of our directors incurred, provided that such director will return any such advance if it is ultimately determined that such director is not entitled to indemnification by us. Any claims for indemnification by our directors and officers may reduce our available funds to satisfy successful third-party claims against us and may reduce the amount of money available to us.

The Certificate of Incorporation requires, to the fullest extent permitted by law, unless the Company consents in writing to the selection of an alternative forum, that derivative actions brought in the name of the Company, actions against current or former directors, officers, employees, agents or stockholders for breach of fiduciary duty, actions arising pursuant to any provision of the DGCL or the Certificate of Incorporation or the Bylaws, actions to interpret, apply, enforce or determine the validity of the Certificate of Incorporation or the Bylaws, actions asserting a claim against the Company or any current or former director, officer, employee, agent or stockholder arising pursuant to any provision of the DGCL or the Certificate of Incorporation or the Bylaws or as to which the DGCL confers jurisdiction on the Delaware Court of Chancery, and actions asserting a claim against the Company or any current or former director, officer, employee, agent or stockholder governed by the internal affairs doctrine of the law of the State of Delaware may be brought only in the Court of Chancery in the State of Delaware (or, if such court lacks subject matter jurisdiction, another state or federal court located within the State of Delaware); provided, however, that the foregoing shall not apply to any claim as to which such court determines that there is an indispensable party not subject to the jurisdiction of such court (and the indispensable party does not consent to the personal jurisdiction of such court within ten (10) days following such determination), which is vested in the exclusive jurisdiction of a court or forum other than such court, or for which such court does not have subject matter jurisdiction, or arising under the Securities Act, as to which the federal district courts of the United States of America shall, to the fullest extent permitted by law, be the sole and exclusive forum unless the Company consents in writing to the selection of an alternative forum. Although we believe this provision benefits the Company by providing increased consistency in the application of Delaware law in the types of lawsuits to which it applies, the provision may have the effect of discouraging lawsuits against our directors and officers.

Delaware law permits corporations to adopt provisions renouncing any interest or expectancy in certain opportunities that are presented to the corporation or its officers, directors or stockholders. The Certificate of Incorporation, to the fullest extent permitted by law, renounces any interest or expectancy that the Company has in, or right to be offered an opportunity to participate in, specified business opportunities that are from time to time presented to the Company’s directors or their respective affiliates, other than those directors or affiliates who are the Company’s employees. The Certificate of Incorporation provides that, to the fullest extent permitted by law, none of the non-employee directors or their respective affiliates will have any duty to refrain from (i) engaging in a corporate opportunity in the same or similar business activities or lines of business in which the Company or any of its affiliates has historically engaged, now engages or proposes to engage or (ii) otherwise competing with the Company or its affiliates. In addition, to the fullest extent permitted by law, in the event that any non-employee director or his or her affiliates acquires knowledge of a potential transaction or other business opportunity which may be a corporate opportunity for itself, herself or himself and for the Company or its affiliates, such person will have no duty to communicate or offer such transaction or business opportunity to the Company or any

of its affiliates and they may take any such opportunity for themselves or offer it to another person or entity. To the fullest extent permitted by law, no business opportunity will be deemed to be a potential corporate opportunity for the Company unless the Company is financially or legally able or contractually permitted to undertake such opportunity, the opportunity, by its nature, would be in the line of the Company’s business or is of some practical advantage to the Company, and the Company has some interest or reasonable expectancy in such opportunity.

The transfer agent for the Company’s common stock is Continental Stock Transfer & Trust Company.