As long as there are legitimate, active multiple employment relationships, it’s possible to concurrently have multiple sponsors for your security clearance. One will have an “owning” relationship with your JPAS (now DISS) record and the others will have a “servicing” relationship. This happens frequently with consultants who do classified work for more than one customer. It also happens when a person has a clearance for their day job but also has a clearance for the National Guard or Reserves. Once you terminate employment, that employer must separate you (terminate clearance sponsorship) in JPAS/DISS .
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