Monday, January 19, 2026

Contact the Benefit Office

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Benefit Office Information

BeneSys is the Third Party Administrator for your benefit funds.
BeneSys is typically available to receive your phone call from 8:00 AM C.S.T. until 4:00 PM C.S.T at its Rosemont, IL office.

Rosemont Office Address
9550 W Higgins Rd, Suite 310
Rosemont, Illinois, 60018
(847) 720-0011 or Toll Free (866) 335-9487
(847) 876-7663 fax
E-mail: staff@local399benefits.org


Please click here for directions to the Benefit Fund Office.

To reach various departments please call our main phone number (see above) and simply ask for the appropriate department. For example:

  • Contributions
  • 401K
  • Administrative services

And if you do not find what you are looking for above, please call and describe the service you are seeking information about and we will help you find it.