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Why I cannot find a “Pure Cash” option in 401k investments?
Holding pure cash is a problem for 401K companies because they would then have follow banking rules because they would be holding your cash on their balance sheets. They don't want to be in that business. Instead, they should offer at least one option as a cash equivalent - a money market fund. This way the money is held by the fund, not by 401K administrator. Money Market funds invest in ultra-short term paper, such as overnight loans between banks and other debt instruments that mature in a matter of days. So it is all extremely liquid, as close to "Money" as you can get without actually being money.  It is extremely rare for a money market fund to lose value, or "break the buck." During the crisis of 2008, only one or two funds broke the buck, and it didn't last long. They had gotten greedy and their short term investments were a little more aggressive as they were trying to get extra returns. In short, your money is safe in a money market fund, and your 401K plan should offer one as the "cash" option, or at least it should offer a short-term bond fund. If you feel strongly that your money should be in actual cash, you can always stop contributing to the 401K and put the money in the bank. This is not a good idea though. Unless you're close to retirement, you'll be much better off investing in a well diversified portfolio, even through the ups and downs of the market.