u/Funkbass

I have a workplace 401(k) plan at Fidelity that has been invested in a target date fund since I began contributing to it about 6 years ago. I decided to swap it out for a total market index US/ex-US position because I am still under 30 and don't feel the need to have any drag on my portfolio from bonds yet. The funds I chose to exchange for based on those available through my plan were "TOTAL STOCK MKT IDX" and "INTL STOCK MKT IDX" which I thought would be FSKAX and FTIHX, but now that I am seeing more info, they don't seem to trade under any ticker (it just says NON40OJFE and NON40OJFF). It looks like these funds virtually match their performance within margin of error (0.1%) over any given time span, but I'm still trying to figure out what exactly they are and why I seemingly can't just hold the larger FSKAX/FTIHX in my 401(k) which appear to have far greater net assets.