This excerpt taken from the UNH 10-K filed Feb 11, 2009.
AMENDMENT AND TERMINATION
10.1. Amendment and Termination. The Committee may unilaterally amend the Plan Statement prospectively, retroactively or both, at any time and for any reason deemed sufficient by it without notice to any person affected by this Plan, and the Board of Directors may terminate this Plan both with regard to persons receiving benefits and persons expecting to receive benefits in the future; provided, however, that:
10.2. No Oral Amendments. No oral representation concerning the interpretation or effect of the Plan Statement shall be effective to amend the Plan Statement. No amendment of the Plan Statement shall be effective unless it is in writing and signed on behalf of the Committee by a person authorized to execute such writing. No termination of the Plan shall be effective unless it is in writing and signed on behalf of the Board of Directors by a person authorized to execute such writing.
10.3. Plan Binding On Successors. UnitedHealth Group shall require any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise of all or substantially all of the business and/or assets of UnitedHealth Group), by agreement, to expressly assume and agree to perform this Plan Statement in the same manner and to the same extent that UnitedHealth Group would be required to perform it if no such succession had taken place.
This excerpt taken from the UNH DEF 14A filed Apr 28, 2008.
The Board of Directors may at any time terminate or amend the Employee Stock Purchase Plan, except that no amendment shall be made without prior approval of the shareholders which would (i) authorize an increase in the number of shares which may be purchased under the Employee Stock
Purchase Plan (other than as a result of a stock dividend, stock-split or reclassification); (ii) permit the issuance of common stock before payment therefore in full; (iii) increase the rate of payroll deductions above 10% of compensation; (iv) reduce the purchase price per share; (v) withdraw administration of the Employee Stock Purchase Plan from the Compensation Committee; or (vi) change the definition of the Companys subsidiaries eligible to participate in the Employee Stock Purchase Plan. The Employee Stock Purchase Plan may be terminated once no further shares of common stock remain for issuance or at any time in the discretion of the Board of Directors (after 30 days written notice to eligible employees).