http://www.sec.gov/about/laws/sa33.pdf
stock, security future, security-based swap, bond, debenture,
evidence of indebtedness, certificate of interest or participation
in any profit-sharing agreement, collateral-trust certificate,
preorganization certificate or subscription, transferable share,
investment contract, voting-trust certificate, certificate of deposit for a security, fractional undivided interest in oil, gas, or
other mineral rights, any put, call, straddle, option, or privilege
on any security, certificate of deposit, or group or index of securities (including any interest therein or based on the value
thereof), or any put, call, straddle, option, or privilege entered
into on a national securities exchange relating to foreign currency, or, in general, any interest or instrument commonly
known as a ‘‘security’’, or any certificate of interest or participation in, temporary or interim certificate for, receipt for, guarantee of, or warrant or right to subscribe to or purchase, any
of the foregoing.
Edit: I don't see how BTCT's claim holds any water whatsoever, but it's not in the US. Those with stock on there, however...