Certified Guaranty Company (CGC) - Comic books, trading card games, lobby cards, signature authentication  video games, magazines, concert posters.

Comic Book Certification Service (CBCS)  - Comic Book Grading, Verified Signatures, and Art authenticity 

PGX Comics - Comic book grading, Signature & Art Authentication

EXPERT GRADING SERVICE (EGS) - Comic book grading & Certified Signatures

WATA Games - Video game authentication and grading 

Video Game Graders - Grade and Authenticate Vintage Video Games

PSA Funko Pop! - Funko Pop! Authentication & Grading Services 

Collectible Grading Authority  (CGA) - Grading and display services for action figures, video games, and VHS collections

Toy Graders Association, Ltd (TGA) - Grading and displaying your toys

Collector Archive Services (CAS) - preservation, archiving, display, grading, authentication, and other services to collectors, buyers and sellers of collectible toys, video games, sports memorabilia, and trading card packs and boxes 

PSA Autograph Authentication, encapsulation & Grading Services 

Beckett Authentication Services - Signature authentication, encapsulation, and grading

VHS DNA - Grading of VHS tapes

Investment Grading Services (IGS) - VHS, Betamax, DVD, Blu-Ray, Steelbooks, and video games (Including PC)