This excerpt taken from the NDAQ 8-K filed Dec 11, 2006.
CERTAIN U.S. FEDERAL TAX CONSEQUENCES TO NON-U.S. HOLDERS
The following is a general discussion of certain U.S. federal income and estate tax consequences of the purchase, ownership and disposition of our common stock. This discussion applies only to a non-U.S. holder (as defined below) of our common stock. This discussion is based upon the provisions of the Internal Revenue Code of 1986, as amended, or the Code, the Treasury regulations promulgated thereunder and administrative and judicial interpretations thereof, all as of the date hereof, all of which are subject to change, possibly with retroactive effect. This discussion is limited to investors that hold our common stock as capital assets for U.S. federal income tax purposes. Furthermore, this discussion does not address all aspects of U.S. federal income and estate taxation that may be applicable to investors in light of their particular circumstances, or to investors subject to special treatment under U.S. federal income or estate tax law, such as financial institutions, insurance companies, tax-exempt organizations, entities that are treated as partnerships for U.S. federal tax purposes, dealers in securities or currencies, expatriates, persons deemed to sell our common stock under the constructive sale provisions of the Code and persons that hold our common stock as part of a straddle, hedge, conversion transaction or other integrated investment. Furthermore, this discussion does not address any U.S. federal gift tax consequences or any state, local or foreign tax consequences. Prospective investors should consult their tax advisors regarding the U.S. federal, state, local and foreign income, estate and other tax consequences of the purchase, ownership and disposition of our common stock.
For purposes of this summary, the term non-U.S. holder means a beneficial owner of our common stock that is not, for U.S. federal income and estate tax purposes, (i) a citizen or resident of the United States, (ii) a corporation or other entity subject to tax as a corporation for such purposes that is created or organized under the laws of the United States or any political subdivision thereof, (iii) a partnership (including any entity or arrangement treated as a partnership for such purposes), (iv) an estate the income of which is subject to U.S. federal income taxation regardless of its source, or (v) a trust (A) if a court within the United States is able to exercise primary supervision over its administration and one or more U.S. persons have the authority to control all of its substantial decisions or (B) that has made a valid election to be treated as a U.S. person for such purposes. If a partnership (including any entity or arrangement treated as a partnership for such purposes) owns our common stock, the tax treatment of a partner in the partnership will depend upon the status of the partner and the activities of the partnership. Partners in a partnership that owns our common stock should consult their tax advisors as to the particular U.S. federal income and estate tax consequences applicable to them.