The remaining shares are owned by a union-managed trust fund established in 2007 to pay retiree healthcare costs. Fiat has been seeking to bring Chrysler in-house as a wholly owned unit, but the company to date has been unable to reach an agreement with the United Automobile Workers' Voluntary Employee Beneficiary Association on a valuation of the remaining VEBA-owned shares. Sergio Marchionne, who serves as CEO of both Fiat and Chrysler, told reporters in Europe over the weekend that a Chrysler listing could occur by year's end or in early 2014. Though the executive is eager to fully integrate the two companies, a public offering could help ease tensions between Fiat and the UAW over valuation and set a market value for the U.S. automaker's shares. Marchionne told reporters last week that Fiat would not pay the $5 billion he said the VEBA wants for its stake, saying "they should buy a lottery ticket" instead.