Pensions' funded status reaches highest levels since 2015.
Nearly 80% of all respondents are now contributing more than the minimum level of funding to their DB plans, survey says.
Mercer says decline may be due to uncertainty over Brexit negotiations.
S&P 500 up 0.05%, while MSCI EAFE down 0.31%.
Reports from Pension Protection Fund and Mercer show improved DB funding.
Report cites empty promises from Social Security, DB programs as the cause.
Aggregate deficit is up $8 billion from the $408 billion measured at the end of 2016.
Inaugural survey revealed high level of dissatisfaction with the pension fund.
Mercer report indicates estimated aggregate deficit in April increased by $1 billion over March’s numbers.