NISA Investment Advisors' Pension Surplus Risk index fell 40 basis points to 9.6% in December. The index ended the year down slightly (from 9.8% at the end of 2012).
The index – which serves as a forward-looking estimate of U.S. corporate pension funded status volatility – fell as interest rate and return-seeking asset volatility decreased during the month.
NISA estimates the average funded status rose to 90.9% from 90% at the end of November.