[notforviewingit]

I don’t know exactly how these companies make their money and how successful they are, but I at least believe all of them are in the odds computation business. They might be supplying prices to bookmakers instead of betting themselves etc.

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These companies are known more for their HFT trading in financial markets, but I believe they have also expanded into sports betting.

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Also some of the bookmakers such as matchbook have started as betting group and then overtime turned into a bookmaker as that is where the real money is.

[sourcepluck]

Thank you, that's wonderful, I'll be sleuthing there and getting a feel for things. Cheers!