The other two F100 customers

With Nationwide finally going live, it would be great to get the research/detective work of many working towards who the other two F100 Flamingo customers are.
I read a very good argument for why these customers are likely to be larger than Nationwide which is why they are yet to be identified by name. The premise being; that a smaller company would conceivably be happy being identified to show they are keeping up with a larger company (being Nationwide).

I think the person who wrote that post identified Liberty Mutual as their pick as one of the two F100.

I personally believe Metlife will be one of them, a reason we were invited to compete in the Metlife Asia competition this year may have been due to this connection.

Anyone else have a point of view on who they may be....