Every new Connecticut business filing, every dayNew Businesses Filed in Darien, CT
667 newly registered businesses tracked in Darien, Connecticut. Browse by category or see the latest filings below.
Updated November 11, 2026 · Most recent business filing Nov 9, 2026
Every new Connecticut filing, every day
See how it worksAbout New Darien Businesses
Darien, CT has 667 newly registered businesses in our database. 28 of those landed in the past 30 days. We refresh this page daily as new Darien companies appear in the Connecticut Division of Corporations records.
The most active industries in Darien are Interior Design (8), Business Consulting (7), and Real Estate (7). Use the category list below to narrow the results to a single industry, or scroll down for the most recent records of any type.
Every entry shows the business name, filing date, and category, plus verified owner and contact information where we have it. The latest Darien business filing was recorded on Nov 9, 2026. You can jump back to the full Connecticut view any time to compare Darien against other markets.
Darien New Business Data
In October 2026, DayOneLead tracked 29 new business filings in Darien, down 6% from September 2026 and up 5% against the prior six-month average of 28.
That is 0.7% of the 4,109 business filings tracked statewide in Connecticut that month.
The U.S. Census Bureau counted 5,353 new business applications in Connecticut in September 2026, 1,377 of them high-propensity (likely to become employers).
New business filings tracked per month
| Month | business filings |
|---|---|
| November 2025 | 30 |
| December 2025 | 24 |
| January 2026 | 30 |
| February 2026 | 36 |
| March 2026 | 36 |
| April 2026 | 37 |
| May 2026 | 20 |
| June 2026 | 24 |
| July 2026 | 24 |
| August 2026 | 30 |
| September 2026 | 31 |
| October 2026 | 29 |
| November 2026 (month to date) | 8 |
Counts of business filings DayOneLead collected from the Connecticut Division of Corporations, starting November 2025 when our feed became complete. The lighter bar is the current month to date.
Census business applications in Connecticut
| Month | Census applications | High-propensity | Statewide tracked |
|---|---|---|---|
| Sep 2026 | 5,353 | 1,377 | 4,391 |
| Aug 2026 | 4,294 | 1,173 | 4,132 |
| Jul 2026 | 5,422 | 1,449 | 4,288 |
| Jun 2026 | 4,473 | 1,220 | 4,401 |
| May 2026 | 4,432 | 1,225 | 4,442 |
| Apr 2026 | 6,099 | 1,686 | 4,721 |
Census Business Formation Statistics count applications for an employer identification number, not seasonally adjusted. They run ahead of state registrations and include sole proprietors that never file with the state, so the two series measure different steps of starting a business.
Websites and domain age
Based on 325 business filings from Oct 2025 to Aug 2026, with domain registration dates from public WHOIS/RDAP records for 80 of them. The latest two months are left out because websites are often found weeks after a filing. A domain much older than the filing usually means an existing operation formalizing, not a brand-new idea.
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Frequently Asked Questions
How many new businesses are registered in Darien, CT?
DayOneLead tracks 667 newly registered businesses in Darien, with about 28 added in the last 30 days.
How fresh is the Darien business data?
We refresh this page every day from the Connecticut Division of Corporations. The latest Darien business filing we recorded was on Nov 9, 2026.
What are the most common new businesses in Darien?
The most active industries among new Darien registrations are Interior Design, Business Consulting, and Real Estate. You can filter by any category to narrow the list.
What information is included for each Darien business?
Each entry shows the business name, filing date, and category, plus a verified owner name, phone, email, and website wherever we can confirm them.
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