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                                                                    EXHIBIT 10.4

                  AMENDMENT NUMBER ONE TO EMPLOYMENT AGREEMENT

      This Amendment Number One to Employment Agreement is entered into as of
the 24th day of April, 2008, by and between TD Ameritrade Holding Corporation
(the "Company") and T. Christian Armstrong ("Executive") (collectively referred
to as the "Parties").

      WHEREAS, Executive and Company entered into an Employment Agreement dated
May 23, 2006 (the "Employment Agreement"); and

      WHEREAS, Executive and Company desire to modify certain of the terms and
conditions of Executive's employment relationship, as originally provided
pursuant to the Employment Agreement;

      NOW, THEREFORE, in consideration of the promises made herein, the Parties
hereby agree as follows:

      (Capitalized terms shall have the meanings ascribed them in the Employment
Agreement)

      1. Termination of Employment. Executive's employment with the Company will
terminate on March 1, 2009, the expiration of the Initial Term (the "Termination
Date"), subject to receipt of Executive's written notice of non-renewal and
voluntary resignation at least sixty (60) days prior to the Termination Date.

      2. Position and Duties. Executive will continue in the same position and
perform the same duties as contemplated by Section 1(a) of the Employment
Agreement through the Termination Date or until such earlier date as may be
determined by the Company in its sole discretion in the event that the Company
earlier retains a replacement for Executive. In the event of such earlier
replacement date, Executive will, following conclusion of a mutually agreed
transition period, assume a modified advisory/special projects position
reporting to the Company's Chief Executive Officer and will remain in that
modified position from such earlier replacement date through the Termination
Date.

      3. Consideration. The Company agrees that Executive shall be entitled to
the following:

            (a) Base Salary. Executive will continue to receive the Base Salary
specified in Section 4(a) of the Employment Agreement through the Termination
Date, as well as all other applicable amounts contemplated by Section 7 of the
Employment Agreement as of the Termination Date.

            (b) Annual Incentive. Executive will continue to be eligible for the
Annual Incentive specified in Sections 4(b) of the Employment Agreement,
provided that (i) the Annual Incentive for the period beginning on October 1,
2008 shall be pro-rated, calculated based on the Target, through the Termination
Date; (ii) both the Annual Incentive for the current fiscal year and the
pro-rata Annual Incentive for the period beginning on October 1, 2008 shall be
paid entirely in cash; and (iii) the Annual Incentives shall be paid at the same
time as such other annual incentives are made to the Company's other executive
officers following the Termination Date and the completion of the applicable
performance period.

            (c) Annual Award. Executive will continue to be eligible for the
Annual Award contemplated by Section 4(c)(ii) of the Employment Agreement,
provided that (i) the Annual

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Award for the period beginning on October 1, 2008 shall be pro-rated, calculated
based on the Target, through the Termination Date; (ii) both the Annual Award
for the current fiscal year and the pro-rata Annual Award for the period
beginning on October 1, 2008 shall be paid entirely in cash; and (iii) the
Annual Awards shall be paid at the same time as such other payments are made to
the Company's other executive officers following the Termination Date and the
completion of the applicable performance period.

            (d) Stock. Executive's vesting and settlement with respect to those
unvested equity awards outstanding as of the Termination Date shall continue to
be subject to all the terms and conditions of the Restricted Stock Unit
Agreements and Plan.

      Executive acknowledges that the foregoing consideration is subject to
execution of a separation and release agreement as further described in Section
9(a) of the Employment Agreement and Executive expressly agrees to sign and not
revoke a separation and release agreement, in substantially the form attached as
Exhibit A to the Employment Agreement, which separation and release agreement
will be provided to Executive on or before the Termination Date.

      4. Waiver of Additional Payments and Rights. Executive acknowledges,
understands and hereby agrees to waive any right to any additional compensation,
benefits, severance or any additional Annual Incentive and/or Annual Award,
other than that compensation, benefits, severance and pro-rata portion of the
Annual Incentive and Annual Award as specified in the Amendment, including
specifically any compensation or benefits as originally specified in Section 8
of the Employment Agreement. Executive also acknowledges, understands and hereby
agrees that neither the modification to his position prior to the Termination
Date contemplated by Section 2 of this Amendment nor the execution of this
Amendment shall be considered grounds to constitute Good Reason pursuant to
Section 8 of the Employment Agreement.

      Except as expressly amended and supplemented hereby, the Employment
Agreement shall remain in full force and effect. In the event of any conflict
between the terms and conditions of this Amendment and the terms and conditions
of the Employment Agreement, this Amendment shall prevail.

      IN WITNESS WHEREOF, the Parties have executed this Amendment on the
respective dates set forth below:

                                   TD AMERITRADE HOLDING CORPORATION

Dated:  April 24, 2008             By: /s/ K. GANZLIN
                                       ------------------------------------
                                   Name: K. Ganzlin
                                   Title: Chief Human Resources Officer

                                   T. Christian Armstrong, an individual

Dated:  April 24, 2008             /s/ T. CHRISTIAN ARMSTRONG
                                   -----------------------------------------EX-10.1

     Exhibit 10.1

AMENDMENT NO. 2 TO RETIREMENT BENEFIT AGREEMENT

     THIS AMENDMENT NO. 2 TO RETIREMENT BENEFIT AGREEMENT (this “Amendment”) is made as of this 25th
day of April, 2008, by and between Mylan Inc., a Pennsylvania corporation formerly known as Mylan
Laboratories Inc. (the “Company”), and Milan Puskar, former Chief Executive Officer and current
Chairman of the Board of Directors of the Company (“Executive”).

     WHEREAS, the Company and Executive are party to that certain Retirement Benefit Agreement
dated as of January 27, 1995, as amended as of September 27, 2001 (the “Agreement”); and

     WHEREAS, as permitted by Section XVI of the Agreement and in recognition of Executive’s
continued commitment and service to the Company as Chairman of the Board, the Company and Executive
desire to amend the Agreement, upon the terms and conditions set forth herein;

     NOW, THEREFORE, for good and valuable consideration, the receipt and adequacy of which are
hereby acknowledged, the parties hereto, intending to be legally bound, agree as follows:

     1. A new Section V.A is hereby added to the Agreement (between Sections V and VI
thereof, which Section reads in its entirety as follows:

     “V.A. SERVICE ON THE BOARD OF DIRECTORS

     5.A.1 Effective as of the date that Executive is no longer serving as a member of
the Company’s Board of Directors (other than by reason of Executive’s death), the Company
shall provide to Executive, for the remainder of his life, continued access to corporate
aircraft comparable to that made available to him immediately prior to the cessation of his
service as Chairman, for his personal use for an aggregate of 70 hours per calendar year
(defined as wheels-up with Executive and/or his family on the aircraft and pro-rated for
any portion of a calendar year), with such access in all other respects to be provided in
accordance with the Company’s practice immediately prior to the cessation of his service as
Chairman. The number of hours of aircraft usage used by Executive in any one calendar year
may not affect the number of hours of usage available in any other calendar year. To the
extent that any income taxes (“Taxes”) are due with respect to Executive’s use of an the
Company’s aircraft, the Company shall provide Executive with a “gross up” of Taxes due on
such use (and any Taxes due on the gross-up payment). Such gross-up payment shall be paid
to Executive no later than by the end of the calendar year next following the calendar year
in which Executive remits the Taxes. Notwithstanding the foregoing, if the Company and
Executive agree that it is required by Section 409A of the Internal Revenue Code to avoid
the imposition of additional taxes, the provision of any benefits pursuant to this section
5.A shall not begin until the date that is six (6) months following

 

 

the date on which Executive’s cessation of service occurs and the Company shall reimburse
Executive for reasonable costs incurred by Executive to independently obtain such benefits
during the six (6) months following the date on which such cessation of services occurs.

     5.A.2 In the event that a Potential Change in Control (as defined below) is deemed
to have occurred, the standards described in Section 5.A.1 above shall be those in effect
immediately prior to the Potential Change in Control, if more favorable to Executive. A
“Potential Change in Control” shall have the meaning assigned to such term in the Company’s
Severance Plan, as the same may be amended from time to time in accordance with the terms
thereof.

     2. (a) The parties acknowledge and agree that this Amendment is an integral part of
the Agreement. Notwithstanding any provision of the Agreement to the contrary, in the event of any
conflict between this Amendment and the Agreement or any part of either of them, the terms of this
Amendment shall control.

          (b) Except as expressly set forth herein, the terms and conditions of the Agreement are and
shall remain in full force and effect.

          (c) The Agreement, as amended by this Amendment, sets forth the entire understanding of the
parties with respect to the subject matter thereof and hereof.

          (d) This Amendment shall be governed by, interpreted under and construed in accordance
with the laws of the State of West Virginia.

          (e) This Amendment may be executed in any number of counterparts, each of which shall be an
original and all of which shall constitute one and the same document.

[Signature page follows]

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     IN WITNESS WHEREOF, this Amendment has been duly executed and delivered as of the day
and year first above written.

	 	 	 	 	 
	 	MYLAN INC.

 	 
	 	By:  	/s/ Rodney L. Piatt
 	 
	 	 	Name:  	Rodney L. Piatt 	 
	 	 	Title:  	Chairman, Compensation Committee 	 
	 

	 	 	 	 	 
	 	EXECUTIVE:

 	 
	 	/s/ Milan Puskar
 	 
	 	Milan Puskar 	 
	 	 	 

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     IN WITNESS WHEREOF, this Amendment has been duly executed and delivered as of the day
and year first above written.

	 	 	 	 	 
	 	MYLAN INC.

 	 
	 	By:  	/s/ Rodney L. Piatt
 	 
	 	 	Name:  	Rodney L. Piatt 	 
	 	 	Title:  	Chairman, Compensation Committee 	 
	 

	 	 	 	 	 
	 	EXECUTIVE:

 	 
	 	  	 
	 	Milan Puskar 	 
	 	 	 
	 

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