Who redirected FactCheck.com to Soros' website?

I don't know, but doing a WHOIS on that domain turns up that it's owned by a company called Domain Name Sales, Corp - presumably a domain squatter.

I was under the impression that corporations had to list executive-level management, but I couldn't find that information anywhere on their website.

Of course, that might very well apply only to American corporations. Looking through the Terms and Conditions page, I found this address:

Domain Name Sales Corp.
10318 APO Grand Cayman, Cayman Islands BWI,

and this for legal jurisdiction:

27. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND INTERPRETED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF PROVINCE OF ONTARIO AND THE FEDERAL LAWS OF CANADA APPLICABLE THEREIN WITHOUT REFERENCE TO RULES GOVERNING CHOICE OF LAWS. ANY ACTION RELATING TO THIS AGREEMENT MUST BE BROUGHT IN ONTARIO AND YOU IRREVOCABLY CONSENT TO THE JURISDICTION OF SUCH COURTS.

So my current best conjecture is that DNS Corp. is a Canadian company that has offshored it's main office to the Caymans for tax purposes.

I couldn't find anything on the factcheck.com page - say in the meta tags - that had any useful information.