Mike, what an interesting question.  Vanguard lets you hide an entire "account" - i.e. an IRA or a Keough, but they don't let you hide a single investment (like a mutual fund) that's in an account that you want to have the rest of displayed.

However, TIAA-CREF has separate numbers for TIAA and CREF accounts, because they're operated by two different corporations.  My guess is that they have such strong regulatory and compliance duties to keep you "informed" that the answer from the horse's mouth will be "no."

Certainly, every young, un-savvy person I've heard of who got an equity account as a teenager and never looked at it for 15 or more years (dancer's union, dining room worker at U.S. Trust, etc. ...) was absolutely astounded when they finally looked at the balance. I hope your account is tax-deferred so that you won't be tempted to spend it when you finally look at it!  Of course, they were lucky their default investment option was a good one.

Just like it's hard to give someone else dieting advice, it's hard to say anything that will let you increase your will power in this regard.  Perhaps there was some virtue to the bad old days (long gone) when you couldn't take anything out of CREF Stock until you retired.

Tim