Find mutual fund by stock holding

I'm interested in finding a mutual fund based on the stock it holds. Basically there's a stock that I'm interested in, and would like to find a mutual fund that has a larger % invested in it. Since I don't want to put all my eggs in that stock, I'd like it as part of a larger portfolio that someone is managing and determining when to sell (instead of holding it too long.)

I thought I read somewhere that an online (free?) tool existed where you could put in a stock and it would tell you the mutual funds that held it. Does anyone know of one?

Thanks.