What is a Common Trust Fund (CTF)? is defined by section 584(a) to mean a fund maintained by a bank exclusively for the collective in- vestment of money the bank holds in its capacity as a trustee, or with trustee-like fiduciary responsibilities to beneficiaries. This definition includes, for instance, situ- ations in which the bank acts as executor for an estate, administrator for an incompetent or minor, or guardian of accounts under the Uniform Gift to Minors Act.

Is this saying that all Fiduciary accounts such as UGMA or UTMA or Custodial accounts, etc are one? Or is it only if the Bank is named a Trustee?

Think of "Common" = "Pooled." Trust departments may hold funds as a fiduciary for multiple trust clients in a single Common Trust Fund which, when on deposit with a bank, carries pass-through deposit insurance determined from the records maintained by the Trust Department concerning the amounts in the account beneficially owned by each of the clients.

No. It might help if you explain what you are working on.