I realize this is probably scant compensation but have you read...

I realize this is probably scant compensation but have you read section 1.5 Rights Trading carefully?

It looks like there will be a nominee who will sell on market the rights that would have been issued to non-participating foreign holders and then pay the the ineligible holder pro-rata less transaction costs.

I've not got my rights allocation showing in my account yet (I believe it will be symbol ALTR) and there are no bids and asks showing yet, but given that each ALTR includes the right to buy an ALT at 0.008 AND 1/3 of a ALTO AND 1/3 of a ALTOA attaching, I'm imagining there will be some possibility of your being eventually paid roughly the same "value" local shareholders are receiving through on-market transactions.

Depending on just how much these trade at you could buy ALT, ALTO and ALTOA on market.

I realize that's not the same as the offer being provided uniformly to all holders but the specific mention of US citizens suggests there are specific hardships being imposed by the SEC, so as others have said, maybe not surprising.

I'd be having a word to my broker if I was in your position (as well as to the company) to get this all clarified because I suspect you have some on-market options that may give you a somewhat similar outcome.