The acronym UPS stands for United Parcel Service. There's only one United Parcel Service not many of them so you would always refer to the company as UPS in the singular.
If you're trying to say something like "The customer representative admitted UPS's mistakes", you're not making UPS plural but using the possessive.
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online ups and offline ups
Yes and No. UPS Mail Innovations is when UPS TRANSPORTS your package, while the USPS (United States Postal Service) makes final delivery instead of UPS.
United Parcel Service
The ticker symbol for UPS (United Parcel Service) is UPS and it is traded on the New York Stock Exchange.
The plural form for fax is faxes.The plural possessive is faxes'.