What Is Form TM-O?

Form TM-O is the Trade Marks Registry's form for contested proceedings — most commonly filing a notice of opposition against a published application, or a rectification/cancellation application against a registered mark.

The main uses

• Notice of opposition: filed by a third party within four months of a mark's journal publication, setting out the grounds for opposing registration.
• Counter-statement: filed by the applicant in response to an opposition, addressing each ground raised.
• Rectification or cancellation: filed against an already-registered mark, seeking to remove or amend it on legal grounds.

Why the deadlines around it matter

Every use of TM-O sits inside a strict statutory clock — the four-month opposition window, or the two-month deadline to file a counter-statement once an opposition is received. Missing the counter-statement deadline means the original application is treated as abandoned, the same hard consequence as missing an examination report response.

Where this fits in the process

TM-O only comes into play if your application is opposed after publication, or if you need to challenge someone else's registration. See our complete guide to opposition proceedings for the full mechanics, or what happens if someone opposes your trademark for the short version, and the full filing sequence in our trademark registration guide.

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