Every new New York business filing, every dayKoster's Collectible Books
KEVIN KOSTER, Registered Agent
Koster's Collectible Books is a second-generation family-owned used and collectible book business based in Farmingville, NY. The business buys books from individuals downsizing, relocating, or handling estates, and sells them online through its own website, AbeBooks, and Biblio.
Filed August 6, 2026 · Farmingville, NY · Suffolk County
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New York Department of State, Division of Corporations · Entity 7985253 · Retrieved August 8, 2026
About Koster's Collectible Books
KOSTER'S COLLECTIBLE BOOKS LLC was filed in New York on August 6, 2026, by owner Kevin Koster, who also serves as the registered agent. The company operates in the used and collectible books category, focusing on rare and collectible books. Its principal location is in Farmingville, New York. The domain for the business was registered nearly ten years before the filing, on June 21, 2016, through DreamHost, and the site was built with Wix. The website was confirmed to match the company's name and address. We estimate annual revenue between $100,000 and $1 million, with 1 to 5 employees. No annual report or EIN is on file yet.
- Domain registered 3,698 days before the filing, indicating long-standing planning or prior operation.
- Filed personally by the owner, who is also the registered agent.
- Website built with Wix and confirmed to match the company's name and address.
- We estimate revenue of $100K-$1M and 1-5 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 25, 2026.
One of 15 new businesses registered in Farmingville in August 2026, and the only used & collectible books business registered there that month.
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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.
Frequently Asked Questions
When was Koster's Collectible Books registered?
Koster's Collectible Books was registered as LLC on August 6, 2026 in New York.
Where is Koster's Collectible Books located?
Koster's Collectible Books is based in Farmingville, NY, 11738, in Suffolk County.
What type of business is Koster's Collectible Books?
Koster's Collectible Books is classified as a used & collectible books business (rare and collectible books).
Does Koster's Collectible Books have an EIN on file?
No EIN was found on file for Koster's Collectible Books at the time of registration.
Who Sells to This Business
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