Who owns Apartments.com?
Apartments.com is owned by CoStar (the United States, NASDAQ: CSGP).[1]
Evidence: CoStar Group, Inc. Annual Report on Form 10-K filed 2026-02-26, SEC EDGAR, 26 February 2026. Verified from filings; last checked .
Key facts
- Current owner
- CoStar Group, Inc. verified
- Owner HQ
- 🇺🇸 United States, Arlington
- Origin
- 🇺🇸 United States
- Category
- Internet & digital › Online commerce › Property listings
- Parent ticker
- NASDAQ: CSGP
- Last verified
- · 1 sources
About Apartments.com
Apartments.com is the flagship of CoStar's network of apartment marketing sites, on which property owners and managers show off an apartment community so renters can view, engage and connect with it. The 10-K groups it with ApartmentFinder, ForRent.com, AFTER55.com, CorporateHousing.com, ForRentUniversity.com, ApartmentHomeLiving.com, Apartamentos.com and WestsideRentals.com, and sits it in the residential segment beside Homes.com. The filing gives no founding date, acquisition date or traffic figure for it.
What CoStar's annual report says about Apartments.com
Sentences about Apartments.com from CoStar's latest annual filing[1], copied word for word.
Apartments.com is the flagship brand of our network of apartment marketing sites which allow property owners and managers to showcase their apartment community through increased exposure and media rich interactions that allow renters to view, engage, and connect with the community.
For Apartments.com and Homes.com, we use multi-channel marketing campaigns, including TV, radio, online ads, social media, email, public relations, SEM, and SEO.
For example, we generally see higher sales of Apartments.com listing services during the peak summer rental season and higher CoStar sales towards the end of the year; however, sales fluctuate from year-to-year and may fluctuate more widely when there are changes in general economic conditions or the industry.
How often CoStar names Apartments.com in its annual report
A plain count of the times the name appears in the text of each annual report, not counting the start of a sentence. A brand that an owner writes about more is usually one it treats as central. The brand is named less often than it was three years earlier.
Ownership timeline of Apartments.com
Where Apartments.com sits in CoStar
Controlling ownership as of . Brands grouped under the entity that owns them; large groups are collapsed.
Open the full CoStar ownership tree →
See the full CoStar brand portfolio (6) →
Other brands owned by CoStar
CoStar controls 6 brands on Brandtree, 6 of them in internet & digital.
Also in internet & digital
Other brands in property listings, and who owns them
CoStar has more brands in property listings on Brandtree than any other owner: 6 of 19.
| Brand | Owner | Owner based in |
|---|---|---|
| Flatmates.com.au | REA Group | 🇦🇺 Australia |
| StreetEasy | Zillow | 🇺🇸 United States |
| Flatfox | SMG Swiss Marketplace Group | 🇨🇭 Switzerland |
| Bina.az | Kaspi.kz | 🇰🇿 Kazakhstan |
| Mercado Libre Classifieds | MercadoLibre | 🇺🇾 Uruguay |
| realtor.com | News Corp | 🇺🇸 United States |
| OneRoof | NZME | 🇳🇿 New Zealand |
| Property.com.au | REA Group | 🇦🇺 Australia |
About the owner: CoStar
CoStar is a publicly listed company headquartered in Arlington, United States. Brandtree records 6 brands under its control, and it is listed as NASDAQ: CSGP.
CoStar Group is an American commercial and residential real estate information and marketplace company, incorporated in Delaware and based at 1201 Wilson Boulevard, Arlington, Virginia, with its shares on the Nasdaq Global Select Market. Its core business is the subscription CoStar database, but its 10-K for 2025 groups its portals into a commercial segment (LoopNet and others) and a residential segment (Apartments.com, Homes.com, Land.com, Domain and OnTheMarket). It bought OnTheMarket in December 2023 and Domain in August 2025, and also owns Matterport, Visual Lease, BizBuySell and Ten-X.
🇺🇸 Apartments.com and other American brands
Brandtree records a controlling owner for 2,399 brands that began in the United States. 461 of them (19%) are now controlled by a company headquartered in another country; Apartments.com is not one of them.
Frequently asked questions
Who is the parent company of Apartments.com?
The parent company of Apartments.com is CoStar, a publicly listed company headquartered in the United States.
Is Apartments.com American?
Yes. Apartments.com originated in the United States and its owner, CoStar, is also headquartered in the United States.
Is Apartments.com still owned by CoStar?
Yes. As of 9 October 2026, Apartments.com is still owned by CoStar. The ownership record was last checked against primary sources on that date.
Sources (1) & corrections
Last verified . Every ownership fact above is backed by one of these primary documents. Numbers in brackets in the text refer to this list.
- [1] CoStar Group, Inc. Annual Report on Form 10-K filed 2026-02-26 — SEC EDGAR, SEC Form 10-K, published 26 February 2026; retrieved 2 October 2026.
Report a correction Opens a pre-filled GitHub issue. See our corrections policy.