https://docs.google.com/spreadsheet/ccc?key=0AtcOUI2xx89EdFY3LWVSOUx4d3dzbjlYQXNVcU1QUkE&usp=sharingFor fun.
An early stab at a BTCT index with automatically updating values. I'm currently putting together a proprietary system that does something a bit more like what's been imagined in the past few posts - although it's meant more as a true index, so I'm not just using the market-float but am instead using the full float for shares issued - which is what you should actually be using to target implied market capitalization of the companies... when you see a mcap using true issuance and not just local float you get a better sense of what the price on the market is actually meant to indicate.
If I look at BTCT's MCap listing, I see that ASICMINER has a market cap by local float of a bit over 100k BTC. If I think to myself from there: "geez, I think ASICMINER is worth more than THAT" I'd be technically correct, but an idiot (or at least an under-informed investor) - as the real market capitalization implied by the trading price that gets you 100k BTC on BTCT yields a true MCap of 1.6Million BTC.
This isn't a funds-flow sheet as some have been discussing - it just does an overall MCAP using local BTCT prices. I'll probably add the MPEX PTs when I'm bored at work tomorrow.
I've been tracking the flow of direct shares for a few months (it was very interesting to watch the shares move from BF to BTCT). The ASICMINER arbitrage between BF, Direct, and BTCT is also something interesting which you can catch on occasion if you're paying attention to the number of shares on each market.
This is also stocks only, although I do think there's value to some of the funds - just not in comparison directly with the stocks (they need their own index, is all).
I follow BTC-Trading on LTCGlobal - the BTCT fund presents an interesting question and uncertain value proposition (which is why I didn't include it, as I'm not sure if it should be considered in the same boat as ASICMINER-PT or not). I'm not, for example, sure that JohnGalt is doing much value-add beyond the BTC/LTC Currency exchange (no offense) - or it may just be that nobody has really taken him up on the offer to transfer shares and so his value-add is there - just unrealized.
For fun I tossed-in a weight distribution - which is basically how many shares of each listed company you'd need to have a portfolio with a marketcap-weighted distribution of shares (and at least one share, although for fun I used at least "1.61803398" shares). This is not meant to be amazeballs or anything, I use something similar for private investment tracking.
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For unified markets I pull directly from APIs instead of just scraping the web output. Anything much more than this would be too competitively useful to share anyway - unless you're coinflow.co or another market data business.