According to the Bloomberg Billionaire Index, each of the three Walton children, born to Walmart Inc. (NYSE WMT) founder Sam Walton, has lost $600 million of their net worth so far this year.

For decades those shares have been controlled by the founder’s three living children: Alice, Jim and Rob. Walton’s children—now in their 70s and 80s—have long been deeply involved in the ...

have expanded voting rights to younger members of their family. Previously, the voting members were Rob Walton, 80, and his siblings Jim Walton, 76, and Alice Walton, 75, all children of patriarch ...