All three major risks still apply. A firm sits on large savings (cash holdings) would not likely to face short term default. But holding too much cash without actively seeking for investment opportunities will eventually decrease productivity and profitability. So for long term, credit risk of default still exist.
Any movement from market (fluctuation of interest rate and exchange rate) would impact firm's investment in the market and that is the market risk exposure.
As always, every firm has its operational risk control, any failure of that control could result operational risk losses.