Justice Anthony Kennedy, frequently the court's swing vote, staked out a middle position, saying that a workable test for excessive gerrymandering might exist someday but that he hadn't seen it yet.
But China is still a relatively small player in overseas direct investments, which include purchases of large, voting stakes in foreign companies and plants.
"Google already betrayed its original agreement with shareholders by concentrating ownership back into its founders after generous employee stock and options grants diluted their voting stakes.
Rupert Murdoch will use News Corp's split to tighten his grip on the media empire he founded, by introducing a new rule that makes it difficult for other shareholders to build significant voting stakes in either of the new companies.
Wrigley, Kellogg, Campbell and Dow Jones all have families with significant voting stakes in their businesses.
Novartis started by buying a 20percentt voting stake from the Swiss financier Martin Ebner in May 2001.
Mr. Malone will increase his effective voting stake in DirecTV to 24percentt, from 17percentt.
Mr. Ebner's BZ Group Holding increased its voting stake to "just over 13percentt," said a spokesman, Ralph Stadler.
National Amusements in turn controls Mr. Redstone's 80percentt voting stake in Viacom.
But Malone's voting stake will fall to 24percentt from the 48percentthatat Liberty Media currently has.
