- Karol Media
- Katherine Mabis McKenna Foundation Inc.
- KDKA TV
- Kennametal Inc.
- Kensey Nash
- Ketchum, Inc.
- Keystone Health Center
- Keystone Hosiery Mills, Inc.
- Keystone Job Corps Center
- Keystone Mountaineer Power Systems Inc.
- Keystone Property Trust
- Kimberly-Clark Corporation
- Kings Family Restaurants
- Kirkpatrick and Lockhart, Nicholson, Graham LLP
- Koppers Inc.
- Korean Community Development Services Center
- KPMG
- KTA-Tator, Inc.
- Kulicke and Soffa Industries Inc.
- Kutztown University
- Laborers Combined Funds
- Lami Grub Architects
- Lancaster General Health - Penn Medicine
- Lankenau Medical Center
- LaSalle University, School of Nursing
- Laurel Highlands Visitors Bureau
- LB Water Service, Inc.
- LDA-L.D. Astorino Companies
- Lebanon Valley Chamber of Commerce
- Lehigh Valley Convention and Visitors Bureau
- Lehigh Valley Health Network
- Lehigh Valley Hospital Transplant Office
- Lehigh Valley Hospital-Cedar Crest
- Liberty Property Trust
- Life's Work of Western Pennsylvania
- LifeSteps
- Lincoln Financial
- Loews Philadelphia Hotel
- Lord Corporation
- Lower Bucks Hospital
- Lutheran SeniorLife
- LutherCare
- Lycoming County United Way
- M.A. Bruder and Sons, Inc.
- M.G. DeLong, Inc.
- Macstir Inc. dba Mac Travel
- Macys, Natrona
- Magee Research Institute and Foundation
- Magee-Womens Hospital of UPMC
- Magnotti and Son, Inc.-The Fireplace and Patio Place