This is something I've been trying to get my arms around for months. I've spoken to my attorneys, and several levels of folks at IB... no one really has a very good understanding of the issues.
Basically, this is a regulatory issue. Here's my foggy understanding:
Foreign securities must be registered with the SEC before they can be traded by US customers. Now, foreign *futures* contracts have a special channel, as they in theory are regulated by the CFTC... and so, foreign exchanges can request a simple "no-action" letter from the CFTC. As long as the CFTC believes the foreign exchange has appropriate management in place, they will approve foreign futures for US trading.
Options are a different creature yet again. SOME options on futures, the CFTC has no problems providing no-action protection on, meaning they're available for US trading. (See: physical commodities like brent, liffe, etc...) SOME options on equity indices the CFTC is instead treating as securities, meaning they should go through the (very expensive/complicated) SEC registration process... which in practice, no one does. The only other alternative, I believe, is if you're a significantly large fund (>$100mm in AUM).
So, this is why we can trade N225 futures, but *NOT* N225 options. But no, I can't figure out why the Singapore-listed N225 options *are* listed as trade-able via IB... that was the question I posed to IB, and no one I could speak to (not even my fund-level contact) had an explanation.
And don't get me started trying to figure out the tax implications of N225 options... are they 1256, or are they not?
Is anyone very clear on this topic?