Ask Experts & Get Answers to Your Questions - ASAP
You would need to contact the company who in charge of your 401K account. If you are unsure as to who is administering your account, your employer should be able to assist. (I would contact Human Resources). Most investment companies have online access so you can login and check your balance, but you need to know who the company is and if they have a special website for your employer.
Please let me know if I can help further.