Largest gamut color spaces

What's the largest? I always thought it was ProPhoto, but recently stumbled upon DCam 5 by Joseph Homes, which is 25% larger than ProPhoto. Is there anything bigger though? Forget usability or how realistic it would be.

According to google it's Loreal Paris.

This forum post has some interesting information, and suggests LAB is bigger than ProFoto. It also points out that since output devices can't render large color spaces they're pretty pointless.

You could also check out Joseph's site.

I did check out his site, that's how I found it. I would actually like to try his profiles, they seem really good comparisons to ProPhoto and AdobeRGB. Unfortunately, you have to pay for them (since you get all these variants, which I don't need and don't know a thing about) and it's pretty expensive.

You can use EktaSpace for free
I use that one when scanning slides.