On July 24, 2013 the First Circuit Court of Appeals, applying an “investment plus” test, concluded that a Sun Capital private equity investment fund was engaged in a “trade or business” for purposes of determining whether the fund could be jointly and severally liable under ERISA for the unfunded pension withdrawal liability of the portfolio company.¹ Two Sun Capital investment funds, conveniently named Sun Capital Partners III, LP (“Fund III”) and Sun Capital Partners IV, LP, (“Fund IV”) (the “Sun Funds”) collectively owned 100 percent of Scott Brass, Inc.