Nurse practitioners with their own private practice (otherwise known as NP business owners) are considerably low in number compared to those who are part of a physician-led private practice, or employed by healthcare institutions.
Being a practice owner carries unique challenges for the NP. Not only do you need to be knowledgeable and competent in clinical matters, you have to be savvy in running a business that would be profitable. That requires knowledge of health codes, insurance reimbursement, scope of practice, and such. That's precisely the reason why few NP's venture into this.
There are a few websites that seem to offer direction to NP's who are interested in owning their practice. One website is from someone who seems to be an expert on this field: Start and grow your business with Nurse Practitioner Business Owner
. Another website lists links to NP practice owners and you may find a site that is located in your metro area from the list: NP Sites | Nurse Practitioners in Business