No licensee shall engage in any business other than the following:
(a) The business of providing financing assistance through the purchase of securities of small business firms or smaller business firms doing business or proposing to do business wholly or substantially in this state.
(b) The business of providing managerial assistance (including managerial and technical assistance) to small business firms or smaller business firms doing business or proposing to do business wholly or substantially in this state.
(c) At least 20 percent of all financing assistance provided by the licensee shall be through purchase of securities of smaller business firms doing business or proposing to do business wholly or substantially in this state.