Document:

FORM OF COMMON STOCK WARRANT

  
 Exhibit 4.3 
  
 This warrant and the securities issuable upon the exercise of this warrant have not been registered under the Securities Act of 1933, as amended (the “Act”) or any applicable state
securities law, and may not be offered, sold, assigned, transferred, pledged, hypothecated, or otherwise disposed of in the absence of an effective registration statement under the Act, and such registration or qualification as may be necessary
under the securities laws of any state, or an opinion of counsel satisfactory to the Company that such registration or qualification is not required. 
  
 US LEC Corp. 
  
 
 
 COMMON STOCK PURCHASE WARRANT 
  
 
 
 Warrant No. 1 
 Dated as of             
             , 2002 
  
 1.      Grant.   For value received, US LEC Corp., a Delaware corporation (the “Company”), hereby grants to
                            , or his, her, or its registered assigns or transferees (the
“Holder”), at the Exercise Price set forth in Section 3 below, the right to purchase
                             shares of Common Stock (the “Warrant Shares”), subject to
adjustment from time to time as hereinafter set forth. This Warrant is issued under a Note Purchase Agreement, dated as of the date hereof, by and among the Company and the Investors listed on the signature page thereof (the “Purchase
Agreement”). Capitalized terms used herein, but not elsewhere defined herein, have the meanings set forth in the Purchase Agreement. 
  
 2.      Exercise Period.  The right to exercise this Warrant, in whole or in part, begins on the date hereof. The right to exercise this Warrant expires on the earlier of (i)
the tenth anniversary of the date hereof and (ii) the date five years after payment of all amounts due under the Notes (the “Expiration Date”). 
  
 3.      Exercise Price.  The exercise price per share of this Warrant is equal to $1.90, subject to adjustment from time to time as hereinafter set forth
(the “Exercise Price”). 
  
 4.      Anti-Dilution Adjustments.

  
 (a)    Adjustment for Changes in Common Stock.  If the
Company pays a dividend or makes a distribution on its Common Stock in shares of its Common Stock, subdivides its outstanding shares of Common Stock into a greater number of shares, combines its outstanding shares of Common Stock into a smaller
number of shares, or issues by reclassification of its Common Stock any other shares of capital stock (each, an “Adjustment Event”), the number of Warrant Shares issuable hereunder immediately 

 prior to such action shall be proportionately adjusted so that the Holder will receive upon exercise, the aggregate
number and kind of shares of capital stock of the Company which the Holder would have owned immediately following such action if the Holder had exercised this Warrant immediately prior to such Adjustment Event, and the Exercise Price in effect
hereunder immediately prior to such action shall be proportionately adjusted so that the Holder shall pay upon exercise, the aggregate amount which the Holder would have paid if the Holder had exercised this Warrant immediately upon to such
Adjustment Event. The adjustment shall become effective immediately upon the record date in the case of a dividend or distribution and immediately after the effective date in the case of a subdivision, combination or reclassification. 

 
 (b)    Capital Reorganizations.  If there shall be any consolidation or
merger to which the Company is a party, other than a consolidation or a merger of which the Company is the continuing or surviving corporation and which does not result in any reclassification of, or change (other than an Adjustment Event) in,
outstanding shares of Common Stock, or any sale or conveyance of all or substantially all of the property of the Company, or any recapitalization of the Company (any such event being called a “Capital Reorganization”), then, effective upon
the effective date of such Capital Reorganization, the Holder shall no longer have the right to purchase Common Stock, but shall have instead the right to purchase, upon exercise of this Warrant, the kind and amount of shares of stock and other
securities and property (including cash) which the Holder would have owned or have been entitled to receive pursuant to such Capital Reorganization if this Warrant had been exercised immediately prior to the effective date of such Capital
Reorganization. As a condition to effecting any Capital Reorganization, the Company or the successor or surviving corporation, as the case may be, shall (a) execute and deliver to the Holder an agreement as to the Holder’s rights in accordance
with this Section 4(b), providing, to the extent of any right to purchase equity securities hereunder, for subsequent adjustments as nearly equivalent as may be practicable to the adjustments provided for in this Section 4. The provisions of this
Section 4(b) shall similarly apply to successive Capital Reorganizations. 
  
 (c)    Adjustment Rules.  Any adjustments pursuant to this Section 4 shall be made successively whenever an event referred to herein occurs. If the Company takes a record of the holders of its
Common Stock for any purpose referred to in this Section 4, then (i) such record date shall be deemed to be the effective date of any adjustment required pursuant to this Section 4 and (ii) if the Company shall legally abandon such action prior to
effecting such action, no adjustment shall be made pursuant to this Section 4 in respect of such action. 
  
 (d)    Notice of Adjustment.  Not less than 10 nor more than 30 days prior to the record date or effective date, as the case may be, of any action which requires or might require an adjustment or
readjustment pursuant to Section 4, the Company shall give notice to the Holder of such event, describing such event in reasonable detail and specifying the record date or effective date, as the case may be, and, if determinable, the required
adjustment and the computation thereof. If the required adjustment is not 

 
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 determinable at the time of such notice, the Company shall give notice to the Holder of such adjustment and computation
promptly after such adjustment becomes determinable. 
  
 (e)    No Fractional
Shares Required to be Issued.  The Company shall not be required to issue fractions of shares of Common Stock upon exercise of this Warrant. If any fraction of a share would, but for this Section, be issuable upon final exercise of
this Warrant, in lieu of such fractional share, the Company shall pay to the Holder in cash an amount equal to the same fraction of the Market Value (as defined in Section 8) per share of outstanding Common Stock immediately prior to the date of
such exercise. 
  
 5.      Reservation of Common Stock.  The Company
will reserve and keep available for issuance and delivery upon the exercise of this Warrant such number of its authorized but unissued shares of Common Stock or other securities of the Company as will be sufficient to permit the exercise in full of
this Warrant. Upon issuance, each of the Warrant Shares will be validly issued, fully paid and nonassessable, free and clear of all liens, security interests, charges and other encumbrances or restrictions on sale (other than restrictions imposed by
applicable securities laws) and free and clear of all preemptive rights. 
  
 6.      No Voting Rights; Limitations of Liability.  Prior to exercise, this Warrant shall not entitle the Holder to (a) any voting rights or (b) other rights as a stockholder of the
Company. No provision of this Warrant, in the absence of affirmative action by the Holder to exercise this Warrant, and no enumeration in this Warrant of the rights or privileges of the Holder, will give rise to any liability of such Holder for the
Exercise Price. 
  
 7.      Exercise Procedure. 
  
 (a)    To exercise this Warrant, the Holder must deliver to the principal office of the Company (prior
to the Expiration Date) this Warrant, the Election to Purchase substantially in the form of Exhibit A attached hereto, and the Exercise Price. The Holder may deliver the Exercise Price by any of the following methods, at the Holder’s option:
(i) in legal tender, (ii) by bank cashier’s or certified check, (iii) by wire transfer to an account designated by the Company, (iv) by delivery to the Company of a Note(s) with instructions to apply all or the applicable portion of the unpaid
principal balance thereof to pay the aggregate Exercise Price (the “Note Payment Amount”) or (v) in accordance with Section 8. Upon exercise, the Company, at its sole expense, will issue and deliver to Holder, within 10 days after the date
on which the Holder exercises this Warrant, certificates for the Warrant Shares purchased hereunder. The Warrant Shares shall be deemed issued, and the Holder deemed the holder of record of such Warrant Shares, as of the opening of business on the
date on which the Holder exercises this Warrant. 
  
 (b)    If this Warrant is
exercised by the delivery of a Note(s) in payment of the aggregate Exercise Price pursuant to Section 7(a)(iv), the Company will cancel the unpaid principal amount of the Note(s) equal to the Note Payment Amount. If the unpaid principal amount of
the Note(s) so delivered exceeds the aggregate Exercise Price, the Company, within 10 days, will deliver to the Holder a replacement Note in a principal amount equal to such excess, together with payment of any accrued but unpaid interest on

 
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 the Note Payment Amount through the date of receipt of the Holder’s Election to Purchase. 
  
 (c)    In the event this Warrant is partially exercised, the Company shall forthwith issue and deliver
to the Holder a new Warrant of like tenor to purchase that number of shares with respect to which such partial exercise did not apply. 
  
 (d)    The Company shall pay any documentary, stamp or similar issue or transfer taxes payable in respect of the issue or delivery of the Warrant Shares. 
  
 8.      Cashless Exercise. 
  
 (a)    Use of Warrant Shares to Pay Exercise Price.  In lieu of paying the applicable Exercise Price by legal tender,
check or wire transfer, the Holder may elect to receive, upon exercise of this Warrant, that number of Warrant Shares equal to the quotient obtained by dividing: 
  
 [(A-B)(X)] by (A), where: 
  
 A      =      the Market Value (as defined below) of a share of Common Stock on the date of exercise; 
  
 B      =      the Exercise Price for a share of Common Stock; 
  
 X      =      the number of Warrant Shares (equal to or less than the number
of Warrant Shares then issuable hereunder) as to 
                  which this Warrant is being exercised. 
  
 (b)    Market Value.  For purposes of this Section 8, the Market Value of a share of Common Stock means: 

 
 (i)    if the Common Stock is listed on a national securities exchange or admitted to
unlisted trading privileges on such exchange or listed for trading on The Nasdaq Stock Market, Inc. — the average of the last reported sale price of the Common Stock for the five consecutive trading days immediately prior to the date of
exercise of this Warrant (or the average closing bid and asked prices for each such day if no such sale is made on such day); 
  
 (ii)  if clause (i) does not apply, and if the prices are reported by the OTC Bulletin Board Service — the average of the means of the last reported bid and asked prices reported for the
five consecutive trading days immediately prior to the date of exercise of this Warrant; and 
  
 (iii) in all other cases, the per share value as determined by the Company’s Board of Directors in good faith. 
  
 9.      Sale of Warrant or Warrant Shares.  Neither the sale of this Warrant nor the issuance of any of the Warrant Shares upon exercise of this Warrant has been registered
under 

 
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 the Act or under the securities laws of any state. The issuance of the Warrant Shares upon exercise of this Warrant shall comply with all
applicable federal and state securities laws. Neither this Warrant nor any of the Warrant Shares (when issued) may be sold, assigned, transferred, pledged or hypothecated or otherwise disposed of except as permitted: (i) by any effective
registration statement under the Act and by registration or qualification under applicable state securities laws or (ii) by an opinion of counsel reasonably satisfactory to the Company stating that such registration under the Act and registration or
qualification under applicable state securities laws is not required. Until the Warrant Shares have been registered under the Act and registered and qualified under applicable state securities laws, the Company shall cause each certificate
evidencing any Warrant Shares to bear the following legend: 
  
 The shares evidenced by this
certificate have not been registered under the Securities Act of 1933, as amended (the “Act”), or under the securities laws of any state. The shares may not be offered, sold, assigned, transferred, pledged or hypothecated or otherwise
disposed of in the absence of an effective registration statement under the Act and such registration or qualification as may be necessary under the securities laws of any state or an opinion of counsel reasonably satisfactory to the Company that
such registration or qualification is not required. 
  
 10.      Transfer.  The Company will register this Warrant on its books and keep such books at its offices. To effect a transfer, the Holder must present (either in person or by duly
authorized attorney) this Warrant and written notice substantially in the form of Exhibit B attached hereto. To prevent a transfer in violation of Section 9, the Company may issue appropriate stop orders to its transfer agent. 

 
 11.      Replacement of Warrant.  If the Holder provides evidence that this
Warrant or any certificate or certificates representing the Warrant Shares have been lost, stolen, destroyed or mutilated, the Company (at the request and expense of the Holder) will issue a replacement Warrant or certificates upon reasonably
satisfactory indemnification of the Company by the Holder. 
  
 12.      Registration
Rights Agreement.  The Holder shall have certain rights in regard to the Warrant Shares issued or issuable hereunder as set forth in a Registration Rights Agreement, as amended, by and among the Company, the Holder and the other
Investors listed on the signature page of the Purchase Agreement. 
  
 13.      Governing Law.  The laws of the State of Delaware (other than its conflict of law rules) govern this Warrant. 
  

 
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 IN WITNESS WHEREOF, the Company has caused this Warrant to be signed on its behalf, in its corporate name, by its
Executive Vice President and Chief Financial Officer, as of the date first written above. 
  
 
	 US LEC Corp.
 a Delaware corporation
  
 
	 
	 By:
 	 	 /s/ Michael K. Robinson        
 

	  	 	 Michael K. Robinson
 Executive Vice President and
       Chief Financial OfficerREGISTRATION RIGHTS

  
 Exhibit 4.4 
  
 REGISTRATION RIGHTS AGREEMENT 
  
 This
Agreement is entered into as of December 31, 2002 by US LEC Corp., a Delaware corporation (the “Company”), and the Investors whose names are set forth on the signature page of this Agreement (collectively, the “Investors”).

  
 A.    The Company and the Investors have entered into a Note Purchase Agreement, dated as of
the same date as this Agreement (the “Purchase Agreement”), pursuant to the terms and conditions of which (i) the Company is issuing and selling to the Investors, and the Investors are purchasing from the Company, $5,000,000 in aggregated
principal amount of Senior Subordinated Notes and (ii) the Company is issuing warrants (the “Warrants”) to the Investors to purchase an aggregate of 2,631,579 shares of Common Stock. 
  

B.    The parties’ execution and delivery of this Agreement is a condition of their respective obligations to close the Purchase Agreement.

  
 The parties agree as follows: 
  
 1.     Definitions. 
  
 Capitalized terms
which are used in this Agreement without being defined have the same meanings that they are given in the Purchase Agreement. In addition, the following terms have these meanings: 
  
 “Commission” means the United States Securities and Exchange Commission. 
  
 “Registrable Securities” means any shares of Common Stock or other securities issued or issuable upon conversion or exercise of the Warrants. Any
Registrable Securities shall cease to be Registrable Securities (i) when they have been distributed to the public pursuant to a offering registered under the Securities Act or sold to the public through a broker, dealer or market maker in compliance
with Rule 144 under the Securities Act (or any similar rule then in force) or repurchased by the Company or any Subsidiary or (ii) if and when they (or, in respect of issuable but not yet issued Registrable Securities, the underlying Warrants or
Common Stock) cease to be held by an Investor or a Permitted Transferee. 
  
 “Registration
Expenses” means all expenses incident to the Company’s performance of or compliance with this Agreement, including all registration and filing fees, fees and expenses of compliance with securities or blue sky laws, printing expenses,
messenger and delivery expenses, fees and disbursements of custodians, and fees and disbursements of counsel for the Company and all independent certified public accountants, underwriters (excluding discounts, commissions and underwriters’
counsel fees) and other Persons retained by the Company. 

  
 “Series A Agreement” means the Registration Rights Agreement,
dated as of April 11, 2000, by and among the Company and affiliates of Bain Capital, Inc. and Thomas H. Lee Partners L.P. 
  
 “Series A Registrable Securities” means the Registrable Securities as defined in the Series A Agreement. 
  
 “Violation” means any of the following statements, omissions or violations: (i) any untrue statement or alleged untrue statement of a material fact contained or incorporated by reference in a registration
statement pursuant to this Agreement, including any related preliminary or final prospectus, any amendment or supplement, or any document filed under state securities or “blue sky” laws, (ii) the omission or alleged omission to state a
material fact required to be stated in any such registration statement, prospectus, amendment, supplement or document or necessary to make the statements in any such registration statement, prospectus, amendment, supplement or document not
misleading, or (iii) any violation or alleged violation by the Company of the Securities Act, the Securities Exchange Act of 1934, as amended (the “Exchange Act”), any state securities law, or any rule or regulation promulgated under the
Securities Act, the Exchange Act or any state securities law. 
  
 2.     Demand Registrations. 

 
 2.1   General.  At any time after the Closing, holders of a majority of the
Registrable Securities then outstanding may request registration under the Securities Act of all or any portion of their Registrable Securities. A registration requested pursuant to this Section 2.1 is referred to in this Agreement as “Demand
Registration.” Holders of Registrable Securities then outstanding shall be limited to two Demand Registrations and any such Demand Registration must include an initial request to register Registrable Securities having an aggregate offering
value of at least $ 3,000,000. In regard to a Demand Registration: 
  
 (a)    
The request for a Demand Registration shall specify the approximate number of Registrable Securities requested to be registered. Within 10 Business Days after receipt of a request for a Demand Registration, the Company shall give written notice of
the requested registration to all other holders of Registrable Securities and, subject to Section 2.2 below, shall include in the registration all Registrable Securities with respect to which the Company has received written requests for inclusion
within 15 Business Days after receipt of the Company’s notice. 
  
 (b)     A
Demand Registration shall not be counted as one of the two permitted Demand Registrations unless (i) it has become effective and (ii) the Persons making the request are able to register and sell at least 75% of the Registrable Securities included in
the registration. 

 
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 (c)    The Company shall pay all Registration
Expenses in connection with a Demand Registration whether or not it is counted as a permitted Demand Registration. 
  
 (d)    A Demand Registration shall be on Form S-2 or Form S-3 or any similar short-form registration statement, if available. Otherwise a Demand Registration shall be on Form S-1 or any similar long-form
registration statement. 
  
 (e)    The Company shall have the right to select the
managing underwriters in connection with an underwritten public offering of Registrable Securities, subject to the approval of a majority of the holders of the Registrable Securities included in a Demand Registration which approval shall not be
unreasonably withheld, and holders of a majority of the Registrable Securities included in a Demand Registration shall have the right to select a co-managing underwriter, subject to the Company’s approval which shall not be unreasonably
withheld. 
  
 (f)    The holders of a majority of the Registrable Securities
included in a Demand Registration shall have the right to select the investment banker(s) and manager(s) to administer an offering of Registrable Securities that is not an underwritten public offering, subject to the Company’s approval which
shall not be unreasonably withheld. 
  
 2.2   Priority on a Demand
Registration.  If a Demand Registration is an underwritten offering and the managing underwriters advise the Company in writing that in their opinion the number of securities requested to be included in such offering exceeds the
number of securities that can be sold in such offering without adversely affecting the marketability of the offering, the Company shall include in such registration only the amount of securities which the managing underwriters have advised can be
sold and will allocate such amount as follows: (i) first, to the Registrable Securities requested to be included in the registration by the holders thereof and to the Series A Registrable Securities requested to be included in the
registration by the holders thereof, pro rata among the respective holders of the Registrable Securities and the Series A Registrable Securities on the basis of the number of Registrable Securities and Series A Registrable Securities owned by each
such holder, and (ii) second, to any other securities requested to be included in such Demand Registration. 
  
 2.3   Restrictions on Demand Registration.  The Company shall not be obligated to effect more than one Demand Registration within any 12-month period. The Company shall not be obligated to effect any
Demand Registration within 180 days after the effective date of a previous registration in which the holders of Registrable Securities were given piggyback rights pursuant to Section 3 and were able to register and sell at least 50% of the
Registrable Securities included in such registration. The Company may postpone for up to 90 days the filing or the effectiveness of a registration statement for a Demand Registration if a certificate signed by an executive officer of the Company is
promptly furnished to the holders requesting the Demand Registration stating that the Board of Directors of the Company has determined that such a Demand Registration 

 
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 would reasonably be expected to have a material adverse effect on any proposal or plan by the Company to
engage in any acquisition of assets (other than in the ordinary course of business) or any merger, consolidation, tender offer, reorganization or similar transaction. In addition, the Company may postpone for up to 180 days the filing of a
registration statement for a Demand Registration if a certificate signed by an executive officer of the Company is promptly furnished to the holders requesting the Demand Registration stating that the Company intends to file a registration statement
for a primary offering of its debt or equity securities within the next 60 days so long as the Company is at all times proceeding in good faith to make such registration statement effective. In the event the filing or the effectiveness of a
registration statement is postponed pursuant to this Section 2.3, the holders of Registrable Securities initially requesting the Demand Registration shall be entitled to withdraw their request. If their request is withdrawn, the Demand Registration
shall not count as one of the two permitted Demand Registrations and the Company will pay all Registration Expenses in connection with such registration. The Company may delay the filing or suspend the effectiveness of a Demand Registration pursuant
to this Section 2.3 only once in any 12-month period. 
  
 3.     Piggyback Registrations. 

 
 3.1   Right To Piggyback.  At any time after the Closing, whenever the Company
proposes to register any of its equity securities under the Securities Act (other than (i) pursuant to a Demand Registration or (ii) a registration on Form S-4 or Form S-8 or any successor or similar form) and the registration form to be used may be
used for the registration of Registrable Securities (a “Piggyback Registration”), whether or not for sale for its own account, the Company shall give prompt written notice to all holders of Registrable Securities of its intention to effect
such a registration and, subject to the provisions of Sections 3.3, 3.4 and 3.5, shall include in the registration all Registrable Securities with respect to which the Company has received written requests for inclusion within 15 Business Days after
receipt of the Company’s notice. Holders of Registrable Securities shall be entitled to unlimited Piggyback Registrations for their Registrable Securities. 
  
 3.2   Piggyback Expenses.  The Registration Expenses of the holders of Registrable Securities shall be paid by the Company in all Piggyback Registrations.

  
 3.3   Priority on Primary Registrations.  If a Piggyback Registration is
an underwritten primary registration on behalf of the Company and the managing underwriters advise the Company in writing that in their opinion the number of securities requested to be included in the registration exceeds the number that can be sold
without adversely affecting the marketability of the offering, the Company shall include in such registration only the amount of securities which the managing underwriters have advised can be sold and will allocate such amount as follows: (i)
first, to the securities that the Company proposes to sell, (ii) second, to the Series A Registrable Securities requested to be included in the registration by the holders thereof, pro rata among the holders of the Series A Registrable
Securities on the basis of the number of such securities owned by each holder, (iii) third, to the Registrable Securities requested to be included in the 

 
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 registration by the holders thereof, pro rata among the holders of the Registrable Securities on the
basis of the number of such securities owned by each such holder, and (iv) fourth, to any other securities requested to be included in the registration. 
  
 3.4   Priority on Secondary Registrations Initiated by Holders of Series A Registrable Securities.  If a Piggyback Registration is an underwritten secondary
registration initiated by a demand by the holders of Series A Registrable Securities and the managing underwriters advise the Company in writing that in their opinion the number of securities requested to be included in the registration exceeds the
number that can be sold without adversely affecting the marketability of the offering, the Company shall include in such registration only the amount of securities which the managing underwriters have advised can be sold and will allocate such
amount as follows: (i) first, to the Series A Registrable Securities requested to be included therein by the holders thereof requesting such registration, pro rata among the holders of such securities on the basis of the number of such
securities owned by each such holder and (ii) second, subject to the provision of Section 10.1, to the Registrable Securities requested to be included in such registration, pro rata among the holders of the Registrable Securities on the basis
of the number of such securities owned by each such holder. 
  
 3.5   Priority on Other Secondary
Registrations.  If a Piggyback Registration is an underwritten secondary registration other than one initiated pursuant to a demand by the holders of the Series A Registrable Securities or the holders of Registrable Securities and
the managing underwriters advise the Company in writing that in their opinion the number of securities requested to be included to the registration exceeds the number that can be sold without adversely affecting the marketability of the offering,
the Company shall include in the registration only the amount of securities which the managing underwriters have advised can be sold and will allocate such amount as follows: (i) first, to the Series A Registrable Securities requested to be
included in the registration by the holders thereof, pro rata among the holders of the Series A Registrable Securities on the basis of the number of such securities owned by each holder, (ii) second, to the Registrable Securities requested to
be included in the registration by the holders thereof, pro rata among the holders of the Registrable Securities on the basis of the number of such securities owned by each such holder, and (iii) third, to any other securities requested to be
included in the registration. 
  
 3.6   Other Registrations.  If the Company
has previously filed a registration statement with respect to Registrable Securities pursuant to Section 2 or pursuant to this Section 3, and if the previous registration has not been withdrawn or abandoned, the Company shall not file or cause to be
effected any other registration of any of its equity securities or securities convertible or exchangeable into or exercisable for its equity securities under the Securities Act (except on Form S-4 or Form S-8 or any successor or similar forms),
whether on its own behalf or at the request of any holder or holders of its securities, until a period of at least 180 days has elapsed from the effective date of the previous registration or, if shorter, a period of at least 60 days has elapsed
from the date all securities covered by such registration have been disposed of. 

 
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 4.      Holdback Agreements. 

 
 4.1    Holders of Registrable Securities.  Each holder of
Registrable Securities shall not effect any public sale or distribution (including sales pursuant to Rule 144) of equity securities of the Company, or any securities convertible into or exchangeable or exercisable for equity securities of the
Company, during the seven days prior to and the 120-day period beginning on the effective date of any Demand Registration or any underwritten Piggyback Registration in which Registrable Securities are included (except as part of such underwritten
offering), unless the underwriters managing the registered public offering otherwise agree. 
  
 4.2    Company.  The Company shall not effect any public sale or distribution of its equity securities, or any securities convertible into or exchangeable or exercisable for such
securities, during such period prior to and following the effective date of any underwritten Demand Registration or any underwritten Piggyback Registration as the Company and the underwriters managing the offering may agree. 
  
 5.      Registration Procedures. 
  
 Whenever holders of Registrable Securities have requested that any Registrable Securities be registered pursuant to this Agreement, the Company shall use
its reasonable best efforts to effect the registration and the sale of such Registrable Securities in accordance with the intended method of disposition. In this regard, the Company will as expeditiously as possible: 
  
 (a)    prepare and file with the Commission a registration statement with respect to such Registrable
Securities and use its reasonable best efforts to cause the registration statement to become effective; 
  
 (b)    notify each holder of Registrable Securities of the effectiveness of each registration statement filed under this Agreement and prepare and file with the Commission any amendments and supplements to the
registration statement and the prospectus that may be necessary to keep the registration statement effective for a period of either (i) not less than 120 days (subject to extension pursuant to Section 8.2), or if such registration statement relates
to an underwritten offering, such longer period as in the opinion of counsel for the underwriters a prospectus is required by law to be delivered in connection with sales of Registrable Securities by an underwriter or dealer or (ii) such shorter
period as will terminate when all of the securities covered by such registration statement have been disposed of in accordance with the intended methods of disposition by the seller or sellers thereof set forth in such registration statement (but in
any event not before the expiration of any longer period required under the Securities Act), and to comply with the provisions of the Securities Act with respect to the disposition of all securities covered by such registration statement until such
time as all of such securities have been disposed of in accordance with the intended methods of disposition by the seller or sellers thereof set forth in such registration statement; 

 
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 (c)    furnish to each seller of Registrable
Securities the number of copies of the registration statement, each amendment and supplement, the prospectus included in the registration statement (including each preliminary prospectus) and any other documents that each seller may reasonably
request in order to facilitate the disposition of the seller’s Registrable Securities; 
  
 (d)    use its best efforts to register or qualify the Registrable Securities under such other securities or blue sky laws of such jurisdictions as any seller reasonably requests and do any and all other acts and
things which may be reasonably necessary or advisable to enable the seller to consummate the disposition in those jurisdictions of the Registrable Securities owned by the seller (but the Company shall not be required to (i) qualify generally to do
business in any jurisdiction where it would not otherwise be required to qualify but for this subparagraph, (ii) subject itself to taxation in any such jurisdiction or (iii) consent to general service of process in any such jurisdiction);

  
 (e)    notify each seller of Registrable Securities, at any time when a
prospectus relating to those securities is required to be delivered under the Securities Act, of the happening of any event as a result of which the prospectus included in the registration statement contains an untrue statement of a material fact or
omits any fact necessary to make the statements in the prospectus not misleading; and, at the request of any seller, the Company shall prepare a supplement or amendment to the prospectus so that, when delivered to purchasers of the Registrable
Securities, the prospectus, as supplemented or amended, does not contain an untrue statement of a material fact or omit to state any fact necessary to make the statements in the prospectus not misleading; 
  
 (f)    cause all such Registrable Securities to be quoted on the Nasdaq Small Cap Market and listed on
any other exchange on which the Company’s shares of Common Stock are listed; 
  
 (g)    provide a transfer agent and registrar for all such Registrable Securities not later than the effective date of the registration statement; 
  
 (h)    enter into such customary agreements (including underwriting agreements in customary form) and take all other actions that
holders of a majority of the Registrable Securities being sold or the underwriters, if any, reasonably request in order to expedite or facilitate the disposition of the Registrable Securities; 
  

(i)    make available for inspection by any seller of Registrable Securities, any underwriter participating in any disposition
pursuant to the registration statement and any attorney, accountant or other agent retained by any such seller or underwriter, all financial and other records, pertinent corporate documents and properties of the Company, and cause the Company’s
officers, employees and independent accountants to supply all information reasonably requested by any such seller, underwriter, attorney, accountant or agent in connection with the registration statement; 
  
 (j)    otherwise use its best efforts to comply with all applicable rules and regulations of the
Commission, and make available to its security holders, as soon as 

 
 7 

 reasonably practicable, an earnings statement covering the period of at least twelve months beginning with the first day
of the Company’s first full calendar quarter after the effective date of the registration statement, which earnings statement shall satisfy the provisions of Section 11(a) of the Securities Act and Rule 158; and 
  
 (k)    in the event of the issuance of any stop order suspending the effectiveness of a registration
statement, or of any order suspending or preventing the use of any related prospectus or suspending the qualification of any securities included in the registration statement for sale in any jurisdiction, use its reasonable best efforts promptly to
obtain the withdrawal of such order. 
  
 6.      Registration Expenses.

  
 6.1    Payment by Company.  All Registration
Expenses shall be borne as provided in this Agreement, except that the Company shall, in any event, pay its internal expenses (including all salaries and expenses of its officers and employees performing legal or accounting duties), the expense of
any annual audit or quarterly review and the expenses and fees for listing the securities to be registered on the Nasdaq Small Cap Market or any other exchange on which the Company’s shares of Common Stock are listed. 
  
 6.2    Fees of Counsel.  In connection with a Demand Registration and each
Piggyback Registration, the Company shall reimburse the holders of Registrable Securities included in the registration for the reasonable fees and disbursements of one counsel chosen by the holders of a majority of the Registrable Securities
included in such registration. 
  
 6.3    Payment by
Holders.  To the extent that Registration Expenses are not required to be paid by the Company, each holder of securities included in any registration under this Agreement shall pay those Registration Expenses allocable to the
registration of such holder’s securities so included, and any Registration Expenses not so allocable shall be borne by all sellers of securities included in the registration in proportion to the aggregate selling price of the securities to be
so registered. 
  
 7.      Indemnification. 
  
 7.1    Indemnification by Company.  The Company agrees to indemnify, to the
extent permitted by law, each holder of Registrable Securities, each Person who controls such holder (within the meaning of the Securities Act), and their respective partners, shareholders, trustees, members, officers and directors against all
losses, claims, damages, liabilities and expenses caused by any Violation, except insofar as the Violation is caused by or contained in any information furnished in writing to the Company by the holder expressly for use in a registration statement,
prospectus, amendment, supplement or related document or is caused by the holder’s failure to deliver a copy of the registration statement or prospectus or any amendment or supplements after the Company has furnished the holder with a
sufficient number of copies. In connection with an underwritten offering, the Company shall indemnify such underwriters, their officers and 

 
 8 

 directors and each Person who controls such underwriters (within the meaning of the Securities Act) to the same extent
provided in this Section 7.1 with respect to the indemnification of holders of Registrable Securities. 
  
 7.2    Indemnification by Holder.  In connection with any registration statement pursuant to which a holder of Registrable Securities is selling Registrable Securities, the holder shall
furnish to the Company in writing such information and affidavits as the Company reasonably requests for use in connection with the registration statement or prospectus and, to the extent permitted by law, shall indemnify the Company, its directors
and any of its officers who signs such registration statement and each Person who controls the Company (within the meaning of the Securities Act) against any losses, claims, damages, liabilities and expenses resulting from any Violation to the
extent that the Violation is caused by or contained in any information furnished in writing to the Company by the holder expressly for use in such registration statement, prospectus, amendment, supplement or related document. This obligation to
indemnify shall be individual, not joint and several, for each holder and shall be limited to the net amount of proceeds received by the holder from the sale of Registrable Securities pursuant to the registration statement. 
  
 7.3    Procedures.  Any Person entitled to indemnification under this Section
7 shall, promptly after the receipt of notice of the commencement of any action, investigation, claim or other proceeding against such indemnified party in respect of which indemnity may be sought from an indemnifying party under this Section 7,
notify the indemnifying party in writing of the commencement thereof. The omission of any indemnified party so to notify an indemnifying party of any such action shall not relieve the indemnifying party from any liability which it may have to such
indemnified party under this Section 7 unless, and only to the extent that, such omission results in the indemnifying party’s forfeiture of substantive rights or defenses or the indemnifying party is otherwise irrevocably prejudiced in
defending such proceeding. In case any such action, claim or other proceeding shall be brought against any indemnified party for which indemnification is claimed pursuant to Section 7.1, and it shall notify the Company of the commencement thereof,
the Company shall be entitled to assume the defense thereof at its own expense, with counsel satisfactory to the Company; provided, that any such indemnified party may, at its own expense, retain separate counsel to participate in such defense.
Notwithstanding the foregoing, in any action, claim or proceeding in which both the Company, on the one hand, and an indemnified party, on the other hand, is, or is reasonably likely to become, a party, such indemnified party shall have the right to
employ separate counsel at the Company’s expense and to control its own defense of such action, claim or proceeding if, (a) the Company has failed to assume the defense and employ counsel as provided herein, (b) the Company has agreed in
writing to pay such fees and expenses of separate counsel or (c) in the reasonable opinion of counsel to such indemnified party, a conflict or likely conflict exists between the Company, on the one hand, and such indemnified party, on the other
hand, that would make such separate representation advisable, provided, however, that the Company shall not in any event be required to pay the fees and expenses of more than one separate counsel (and if deemed necessary by such separate counsel,
appropriate local counsel who shall report to such separate counsel). The Company agrees that it will not, without the prior written consent 

 
 9 

 of an indemnified party, settle, compromise or consent to the entry of any judgment in any pending or threatened claim,
action or proceeding relating to the matters contemplated hereby (if such indemnified party is a party thereto or has been actually threatened to be made a party thereto) unless such settlement, compromise or consent includes an unconditional
release of such indemnified party from all liability arising or that may arise out of such claim, action or proceeding. The Company shall not be liable for any settlement of any claim, action or proceeding effected against an indemnified party
without the prior written consent of the Company. The rights accorded to indemnified parties hereunder shall be in addition to any rights that any indemnified party may have at common law, by separate agreement or otherwise. 
  
 7.4    Survival.  The indemnification under this Section 7 shall remain in
full force and effect regardless of any investigation made by or on behalf of the indemnified party or any officer, director or controlling Person of the indemnified party and shall survive the transfer of securities. The Company and each holder
subject to Section 7.2 also agree to make such provisions as are reasonably requested by any indemnified party for contribution to the indemnified party in the event that the Company’s or such holder’s indemnification is unavailable for
any reason. 
  
 8.      Participation in Underwritten Registration.

  
 8.1    Cooperation with Underwriters.  No Person
may participate in any underwritten registration pursuant to this Agreement unless the Person (i) agrees to sell securities on the basis provided in the underwriting arrangements and (ii) completes and executes all questionnaires, powers of
attorney, indemnities, underwriting agreements and other documents required under the terms of the underwriting arrangements. In any event, however, no holder of Registrable Securities included in any underwritten registration shall be required to
make any representations or warranties to the Company or the underwriters (other than representations and warranties regarding the holder and the holder’s intended method of distribution) or to undertake any indemnification obligations to the
Company or the underwriters except as otherwise provided in Section 7.2. 
  
 8.2    Discontinuance of Dispositions.  Each Person that is participating in any registration hereunder agrees that, upon receipt of any notice from the Company of the happening of any
event of the kind described in Section 5(e) above, such Person will forthwith discontinue the disposition of its Registrable Securities pursuant to the registration statement until such Person receives copies of a supplemented or amended prospectus
as contemplated by such Section 5(e). In the event the Company shall give any such notice, the applicable time period mentioned in Section 5(b) during which a registration statement is to remain effective shall be extended by the number of days
during the period from and including the date of the giving of such notice pursuant to this Section to and including the date when each seller of a Registrable Security covered by such registration statement shall have received the copies of the
supplemented or amended prospectus contemplated by Section 5(e). 

 
 10 

  
 9.    Current Public Information. 
  
 The Company will timely file all reports required to be filed by it under the Securities Act and the Exchange Act and the rules and
regulations adopted by the Commission thereunder, all to the extent required to enable such holders to sell Registrable Securities pursuant to Rule 144 adopted by the Commission under the Securities Act (as such rule may be amended from time to
time) or any similar rule or regulation hereafter adopted by the Commission and pursuant to Form S-3 or any similar short form registration statement. Upon written request, the Company will deliver to such holders a written statement as to whether
it has complied with such requirements. In addition, unless the Common Stock is listed for trading on the New York Stock Exchange, the Company, to the extent permitted by Nasdaq, will continue to cause its Common Stock and any Common Stock issuable
upon conversion or exercise of the Warrants to be listed for trading on the Nasdaq Small Cap Market. 
  
 10.    Miscellaneous. 
  
 10.1    Certain
Limitations Contained in Series A Agreement.  The holders of the Registrable Securities are not entitled to include Registrable Securities in a demand registration initiated by the holders of the Series A Registrable Securities
without the prior written consent of the holders of a majority of the Series A Registrable Securities included in such registration. With the consent of the holders of a majority of the Series A Registrable Securities, the holders of the Registrable
Securities may participate in Piggyback Registrations pursuant to Sections 3.3 and 3.5 on a pari passu basis with the holders of the Series A Registrable Securities. 
  
 10.2    Notices.  All notices, claims, demands and other communications (“Notices”) under this Agreement shall be in
writing and sent by certified or registered mail, return receipt requested, a recognized overnight courier service, telecopier or personal delivery, as follows: 
  
 (a)    if to the Company, to: 
  
 US LEC Corp. 
 Three Morrocroft Centre 
 6801 Morrison Boulevard 
 Charlotte, North Carolina 28211 
 Attention: Chief Executive and Chief Financial Officer 
 Telecopier: (704) 319-3098 

 
 11 

  
 with a required copy to: 
  

Moore & Van Allen, PLLC 
 100 North
Tryon Street, Floor 47 
 Charlotte, North Carolina 28202-4003 
 Attention: Barney Stewart III 
 Telecopier: (704) 378-2029 
  
 (b)    if to the Investors: 
  
 To the address of each Investor on 
 Schedule
A to the Purchase Agreement 
  
 with a required copy to: 
  
 Harter Secrest & Emery LLP 
 1600 Bausch
& Lomb Place 
 Rochester, New York 14604-2711 
 Attention: Frank T. Crego 
 Telecopier: (585) 232-2152 
  

All Notices shall be deemed to have been duly given: when delivered by hand, if personally delivered; when delivered by courier, if delivered by commercial overnight courier service; five
Business Days after being deposited in the mail, postage prepaid, if mailed; and when receipt is acknowledged by the individual to whom the telecopy is sent, if telecopied. A party may change its address for purposes of this Agreement by Notice in
accordance with this Section 10.2. 
  
 10.3    Waiver.  The rights and
remedies of the Company and holders of Registrable Securities are cumulative and not alternative. Neither the failure nor any delay by the Company or any holder of Registrable Securities in exercising any right, power or privilege under this
Agreement shall operate as a waiver of that right, power or privilege, and no single or partial exercise of any right, power or privilege shall preclude any other or further exercise of that right, power or privilege or the exercise of any other
right, power or privilege. All waivers shall be in writing signed by the party to be charged with the waiver, and no waiver that may be given by a party shall be applicable except in the specific instance for which it is given. 

 
 10.4    Amendment.  This Agreement may not be amended except by a written agreement
signed by the Company and holders of a majority of the Registrable Securities. 
  
 10.5    Severability.  If any provision of this Agreement is held invalid or unenforceable by a court of competent jurisdiction, the other provisions of this Agreement shall remain in full
force and effect. Any provision of this Agreement which is held invalid or unenforceable only in part shall remain in full force and effect to the extent not held invalid or unenforceable. 

 
 12 

  
 10.6    Captions.  The captions of
sections of this Agreement are for convenience only and shall not affect this the construction or interpretation of this Agreement. 
  
 10.7    Construction.  All references in this Agreement to “Section” or “Sections” refer to the corresponding section or sections of this Agreement. All words
used in this Agreement shall be construed to be of the appropriate gender or number as the context requires. Unless otherwise expressly provided, the word” including” does not limit the preceding words or terms. 
  
 10.8    Counterparts.  This Agreement may be executed in one or more counterparts, each of
which shall be considered an original copy of this Agreement and all of which, when taken together, shall be considered to constitute one and the same agreement. 
  
 10.9.    Entire Agreement.  This Agreement supercedes all prior agreements between the parties with respect to its subject matter and constitutes a complete
and exclusive statement of the terms of the agreement between the parties with respect to its subject matter. 
  
 10.10    Governing Law.  This Agreement shall be governed by the laws of the State of Delaware without regard to conflicts of laws principles. 
  
 10.11    Binding Effect.  This Agreement shall apply to, be binding in all respects upon and
inure to the benefit of the parties and their respective successors and permitted assigns and transferees. 
  
 [Signature
Pages Follow] 

 
 13 

  
 IN WITNESS WHEREOF, the parties have caused this Agreement to be duly executed as
of the date first above written. 
  
 
	 US LEC CORP.
 
	 
	 By:
 	 	 /s/ Michael K. Robinson
 

	  	 	 Name: Michael K. Robinson
 Title: Executive Vice President and
               Chief Financial Officer
 

 
  
  
 
	 INVESTORS
  
 
	 
	 /s/ Richard T. Aab
 

	 Richard T. Aab
 
	 
	 /s/ Tansukh V. Ganatra
 

	 Tansukh V. Ganatra
 
	 
	 /s/ Shirley C. Levy
 

	 Shirley C. Levy
 
	 
	 /s/ Michael E. Jones
 

	 Michael E. Jones
 
	 
	 /s/ Frank Lamar, DDS
 

	 Frank Lamar, DDS
 
	 
	 /s/ Kevin J. Phelps
 

	 Kevin J. Phelps
 
	 
	 /s/ Ann E. Phelps
 

	 Ann E. Phelps
 
	 
	 /s/ Stephen E. Webster
 

	 Stephen E. Webster
 

 

 
 14 

  
 
	 
	 /s/ R. Wayne LeChase
 

	 R. Wayne LeChase
 

 
  
 
	 SYKES ASSOCIATES,
 a New York Limited Partnership
 
	 
	 By:
 	 	 /s/ Robert F. Sykes
 

	  	 	 Name: Robert F. Sykes
 Title: General Partner
 

 
  
 
	 ROBJAN LLC,
 a New York Limited Liability Company
 
	 
	 By:
 	 	 /s/ Dr. Robert Loss
 

	  	 	 Name: Dr. Robert Loss
 Title: Manager/Member
 

 
  
 
	 BROPHY, DAILEY & CO., Profit Sharing Plan,
 
	 
	 By:
 	 	 /s/ Harold E. Dailey, Jr.
 

	  	 	 Name: Harold E. Dailey, Jr.
 Title: Trustee
 

 
  
 
	 Frame Family LLC,
 a New York Limited Liability Company
 
	 
	 By:
 	 	 /s/ Robert B. Frame
 

	  	 	 Name: Robert B. Frame
 Title: Manager/Member
 

 
  
 
	 Jo & Co.,
 an Indiana
Partnership
 
	 
	 By:
 	 	 /s/ Ross J. Mangano
 

	  	 	 Name: Ross J. Mangano
 Title: General Partner
 

 

 
 15

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