Every new Connecticut business filing, every dayGwilliam Psychiatry
Nathan Gwilliam, Principal
Gwilliam Psychiatry PLLC is a psychiatry and psychotherapy practice led by Dr. Nathan Gwilliam, MD, located at 389 Whitney Avenue in New Haven, CT. The website describes an attachment-informed, psychodynamic approach to mental health care.
Filed March 9, 2026 · New Haven, CT · New Haven County
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Connecticut Secretary of the State (business.ct.gov) · Entity 3394212 · Retrieved July 27, 2026
About Gwilliam Psychiatry
Gwilliam Psychiatry PLLC filed in Connecticut on March 9, 2026, as a healthcare practice specializing in psychiatry and psychotherapy. Principal Nathan Gwilliam is listed as the owner. The domain was registered on the same day as the filing, March 9, 2026, through Squarespace Domains. The website was built with the Wix Website Builder and is modern in quality. The site matched the filing's name and address. The business operates with a hybrid footprint. We estimate revenue under $100,000 and 1 to 5 employees. No annual report or EIN is on file yet.
- Domain registered on the same day as the Connecticut filing date.
- Principal Nathan Gwilliam is the owner.
- Website built with Wix Website Builder and confirmed to match the filing's name and address.
- We estimate revenue under $100,000 and 1 to 5 employees.
- No annual report or EIN on file yet.
Compiled from the state record, the company's public web presence, and our own research; revenue, employee, and footprint figures are estimates, not verified financials. Updated August 23, 2026.
One of 157 new businesses registered in New Haven in March 2026, one of 2 healthcare businesses.
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Filing Details
Verified Business Profile
Contact Information
Verified Website Profile
We matched this business to its website and pulled the domain's registration (WHOIS) record. Domain age is one of the strongest signals that a filing is a truly new business and not a re-filing or paperwork change.
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Frequently Asked Questions
When was Gwilliam Psychiatry registered?
Gwilliam Psychiatry was registered as LLC on March 9, 2026 in Connecticut.
Where is Gwilliam Psychiatry located?
Gwilliam Psychiatry is based in New Haven, CT, 06511, in New Haven County.
What type of business is Gwilliam Psychiatry?
Gwilliam Psychiatry is classified as a healthcare business (psychiatry & psychotherapy).
Does Gwilliam Psychiatry have an EIN on file?
No EIN was found on file for Gwilliam Psychiatry at the time of registration.
Who Sells to This Business
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