Thompson Street Capital Partners has invested in ATIS, a provider of elevator and escalator safety inspections, consulting, and managed services.ATIS offers government-mandated inspections, condition assessments, design consulting, and elevator asset management services.ATIS also provides specialized services like real estate due diligence assessments and hydraulic oil testing.Thompson Street Capital Partners plans to support ATIS with investments in sales and marketing, new service offerings, and strategic acquisitions.