NISA Investment Advisors' Pension Surplus Risk index slid 10 basis points in August to 6.6%.
Year-to-date, the index has fallen 220 basis points, and 200 basis points over the trailing 12-month period.
The volatility of the return-seeking asset component of the index increased 20 basis points to 7.7% after three consecutive months of declines. The volatility of the liability component was 7.4% at the end of August, a 50-basis-point decline from July.
The average plan funding ratio was 85.2%, a 30-basis-point drop from August, but slightly above 2017's 85.1% average.
The index is a forward-looking estimate of the funded status volatility of the 100 largest corporate pension plans as determined by NISA from publicly available information.
