If two trademarks holders own the same trademark, do they both need to submit it?

No, only one trademark holder needs to submit the trademark record. The owner that is reported to the trademark Clearinghouse should sign the proof of use declaration.

FAQ

API (Automated Interface)

billing

correction process

general

mark record verification

Notifications

official agents

proof of use

Registrars

Registries

Signed Mark Data (SMD)

Strawman Model - Abused Labels

Sunrise Services

support

trademark claims services

Trademark Eligibility Requirements

trademark submission

TREx Service

user registration