TSP investors had just below $440 billion in their accounts as of year-end 2014, the TSP has reported, with the G fund the most popular with 35 percent, followed by the C fund, 28 percent, the five L funds collectively, 17 percent, the S fund, 10 percent, and the F and I funds, 5 percent each. That’s up from $397 billion at year-end 2013, with a slightly heavier concentration in the stock funds compared with the G fund, due in part to the gains in the C and S funds in 2014.