How to say you are adding someone to an email thread

Ways to say it

• Adding Sam, who owns

  NeutralA2

  Plain and clear in any context. Naming what they own tells the new reader why they are here and tells the rest who to ask next.

  ExampleAdding Sam, who owns the billing integration and can answer the refund question directly.

• Looping in

  CasualB2

  Very common in internal English-speaking teams. "No action needed" is the useful half: without it, everyone added assumes they are now on the hook.

  ExampleLooping in Priya for visibility — no action needed from her side.

• I'm copying in

  FormalB1

  For external threads and anything with a compliance flavour. Signals a deliberate, recorded decision rather than a casual mention.

  ExampleI'm copying in our data protection officer, as the request concerns retention periods.

When not to use

Do not use these when you are actually handing the thread over and stepping away — "looping in Sam" while quietly stopping work leaves the sender waiting on you. Say so explicitly: "Sam is taking this from here; I'll drop off the thread." Ambiguous additions are the most common way a request ends up owned by nobody.