If you are allowed to hold 2 months contributions in cash, do that, and then when you have big drops, put the cash back in. Dollar cost averaging is what us regular folks need. Keep plunking it in, and then when you get a hit, put more in. Then for 4 months, half in cash and half into holdings. I have done that for years and always beat the annual returns on my holdings just by buying at a low once a year.