<prompt> Translate the following text to EnglishWashiriki katika mipango ya 401 k wanaweza kuathiriwa hasa katika hali ambapo akaunti zao zimewekeza sana katika hisa za mwajiri, ama kwa sababu mwajiri wao hufanana na michango yao ya wafanyikazi katika fomu ya hisa kama hizo au kwa sababu wao wenyewe hufanya uwekezaji mkubwa katika hisa za mwajiri wao kwa kutumia michango yao ya hiari.  <response>: Participants in 401k plans can be particularly harmed in situations where their accounts are heavily invested in employer stock, either because their employer matches their employee contributions in the form of such stock or because they themselves make significant investments in their employers stock using their own voluntary contributions. 