I couldn't tell you. I tried searching, but came up short.
“Who are the major stockholders in this ‘Corp.’?”
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https://opengovus.com/texas-taxpayer/32076741498 Since the taxpayer address for the JWJC ranch is the same Chicago address as Breyer’s office there, I would bet that he is the only owner of the ranch property. That’s speculation but it seems he is certainly wealthy enough to be a sole owner of it.