Hi Pamaved-

This is a tough one. Any chance you remember who your fund provider was (like Vanguard or Schwab for example)? Are you in touch with any old colleagues who might remember? If you can track down the provider's name then I'd start by contacting them.

If not - then a good bet is Samsung's HR office.

Unfortunately this is a reminder of the virtues of rolling your 401k into an IRA after you leave a company.