General Motors Co.'s recent stock offering was staged to start paying back the government for its $50 billion bailout, but one group made out much better than the taxpayers or other investors: the company's union.

Thanks to a generous share of GM stock obtained in the company's 2009 bankruptcy settlement, the United Auto Workers is well on its way to recouping the billions of dollars GM owed it — putting it far ahead of taxpayers who have recouped only about 30 percent of their investment and further still ahead of investors in the old GM who have received nothing.