Reuters reports the fund had a return of 5.86% on assets worth 144.9tn yen.
These gains were made as the Nikkei 225 index gained 12.8% in the last fiscal year, while global stocks benefited from continuing loose monetary policy and central banks kept interest rates close to all-time lows.
The fund made a 14.89% return on its Japanese stock holdings, and 14.2% on its foreign stock holdings.
In 2014, the fund changed policy, increasing investments in riskier assets while it reduced reliance on low-yielding domestic bonds.
Japanese stock holdings accounted for 23.28% of its assets, while domestic bonds made up 31.68%.