New Jersey policyholders’ surplus increased $7.8 billion to $564.7 billion at March 31, 2011, from $556.9 billion at year-end 2010. Additions to surplus in first-quarter 2011 included insurers’ $7.8 billion in net income after taxes, $3.9 billion in unrealized capital gains on investments (not included in net income), $1.5 billion in new funds paid in (new capital raised by insurers), and $0.4 billion in miscellaneous additions to surplus, according to ISO, Inc. As a result,…