<prompt> Human: I logged into my Fidelity account today and almost had a heart attack. My portfolio has been nearly cut in half just since this morning and its showing that the two Fidelity funds Im invested in FSELX and FSCSX are both down 90 percent! I keep a very close watch on my finances and check my portfolio daily--as of this morning there was no loss.Could this be real or is it likely some sort of fluke? Im invested in some other non-Fidelity funds that have not been affected. Ive also searched the symbols outside of Fidelitys website and they both appear to have closed today with a gain.What is my course of action from here? If it is some mistake, would it be resolved on its own or would I have to call Fidelity to get it sorted out?Im a little bit new to investing and am kind of freaking out wondering if Ive done something wrong. Any advice would be appreciated! Thank you!EDIT:I called Fidelity. An automated recording said that after close today some mutual funds are conducting a 10 for 1 share split. Can anyone tell me what that might mean and why it has reduced my portfolio by so much?EDIT 2:Thank you so much, everyone! I cant believe how quickly my questions were answered. I feel so relieved. This community is amazing!  <response>: 10:1 split 