No domestic incorporated fire, life or marine insurer shall make excess funds investments in purchases of, or loans upon, more than percent of the total in par value or number of outstanding shares of the capital stock of any one corporation, except: (

a) In the purchase of the stock of another admitted domestic insurer; or (

b) With the prior authorization of the commissioner, in the purchase of stock of any other insurance corporation organized under the laws of any other state, or of the Dominion of Canada or of any province of the Dominion of Canada, which is supervised by the state or dominions or provincial insurance commissioner or similar official, and the investments of which comply in substance with the investment requirements and limitations imposed by this code upon like domestic insurers; provided, that no such domestic insurer shall have in the aggregate more than percent of its capital and surplus invested in the stocks of insurance corporations organized under the laws of this state or other states or of the Dominion of Canada or of any province of the Dominion of Canada. (

c) In the purchase of stock of any corporation organized under the laws of this state for the exclusive purpose of engaging in the business of financing insurance premiums and any and all matters incidental thereto and engaging exclusively in such business and such matters. (

d) Such insurer may purchase or otherwise acquire all or any percent of the issued and outstanding stock of any corporation which is any of the following:

(1) A corporation providing investment advisory, management, or sales services to an investment company or separate account.

(2) A real property holding, developing, managing, or leasing corporation.

(3) A data processing or computer service corporation.

(4) An investment company or companies as defined by the Investment Company Act of 1940, (Title 15, U.S.C., Sec. 80a-1, et seq.).

(5) A corporation acting as administrative agent for a governmental instrumentality performing insurance-related functions, or for private health and welfare plans.