1. As executor or administrator of the estate of any decedent, whether such decedent was a resident of this state or not, and whether the administration of the estate of such decedent be original or ancillary; provided, that if the executor or administrator of the estate of a nonresident decedent be a corporation duly authorized, qualified and acting as such executor or administrator in the jurisdiction of the domicile of the decedent, it may, as a foreign executor or administrator, perform such duties and exercise such powers and privileges as are required, authorized and permitted by Section 1001 of this title;

2. As guardian of any infant, insane person or person physically or mentally incompetent whether domiciled in this state or not;

3. As trustee under any inter vivos trust, will or other testamentary instrument, provided that any corporation which is authorized to act as such trustee under the laws of the place where it has its principal place of business may receive bequests to it as trustee of money or intangible personal property;

4. As trustee of any real estate in this state or any interest therein under any agreement whereby the beneficial interest in such property is vested in others;

5. As receiver or trustee under appointment of any court in this state;

6. As assignee, receiver or trustee of any insolvent person or corporation or under any assignment for the benefit of creditors; or

7. As fiscal agent, transfer agent or registrar of any municipal or private corporation; provided, however, that nothing herein shall prevent any Oklahoma corporation not a bank or trust company and not having trust powers from being its own fiscal agent, transfer agent or registrar concerning its own affairs, stock or securities.

Nothing in this section shall be construed as authorizing or permitting any foreign bank or trust company to maintain an office within this state.