Who owns CoreSite?
CoreSite is owned by American Tower (the United States, NYSE: AMT), which has owned the brand since 2021.[1]
American Tower owns 71% of CoreSite rather than all of it.
Evidence: American Tower Corporation Annual Report on Form 10-K filed 2026-02-24, SEC EDGAR, 24 February 2026. Verified from filings; last checked .
Key facts
- Current owner
- American Tower Corporation (71% stake) verified
- Owned since
- Owner HQ
- 🇺🇸 United States, Boston, Massachusetts
- Origin
- 🇺🇸 United States
- Category
- Telecom › Satellite & towers › Towers & network infrastructure
- Parent ticker
- NYSE: AMT
- Last verified
- · 1 sources
About CoreSite
CoreSite is the data center business American Tower bought when it acquired CoreSite Realty Corporation in late 2021; the 10-K gives no day. American Tower now holds a controlling common equity interest of about 71% in its U.S. data center business, with investment vehicles affiliated with Stonepeak holding the remaining common equity and the preferred equity.
Ownership timeline of CoreSite
- 2021 – present American Tower (71%) [1] verified American Tower holds a controlling common equity interest of about 71% in its U.S. data center business; Stonepeak holds about 29% of the common equity and all of the mandatorily convertible preferred equity.
Where CoreSite sits in American Tower
Controlling ownership as of . Brands grouped under the entity that owns them; large groups are collapsed.
- American Tower
- CoreSite (71%)
Open the full American Tower ownership tree →
See the full American Tower brand portfolio (2) →
Other brands owned by American Tower
American Tower controls 2 brands on Brandtree, 2 of them in telecom.
Also in telecom
Other brands in towers & network infrastructure, and who owns them
The 6 brands in towers & network infrastructure on Brandtree belong to 3 owners. The largest is Telkom Indonesia, with 3; American Tower has 2.
| Brand | Owner | Owner based in |
|---|---|---|
| Mitratel | Telkom Indonesia | 🇮🇩 Indonesia |
| Equinix Fabric | Equinix | 🇺🇸 United States |
| NeutraDC | Telkom Indonesia | 🇮🇩 Indonesia |
| Telin | Telkom Indonesia | 🇮🇩 Indonesia |
Every brand in towers & network infrastructure and its owner →
About the owner: American Tower
American Tower is a publicly listed company headquartered in Boston, Massachusetts, United States. Brandtree records 2 brands under its control, and it is listed as NYSE: AMT.
American Tower is a real estate investment trust that leases space on communications sites to wireless carriers, broadcasters and other tenants. At 31 December 2025 it owned and operated 149,686 communications sites, including 862 distributed antenna system networks, across the United States and Canada, Africa and Asia-Pacific, Europe and Latin America. Property operations, including its data centers, were 97% of 2025 revenue.
American Tower: full profile, brands and acquisition history →
🇺🇸 CoreSite 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; CoreSite is not one of them.
- Equinix Fabric — Equinix 🇺🇸
- Iridium — Iridium 🇺🇸
- NexusWave — Viasat 🇺🇸
- 20th Century Studios — Disney 🇺🇸
- 2K — Take-Two 🇺🇸
- 3 Day Blinds — Hunter Douglas 🇳🇱
Frequently asked questions
Who is the parent company of CoreSite?
The parent company of CoreSite is American Tower, a publicly listed company headquartered in the United States.
Is CoreSite American?
Yes. CoreSite originated in the United States and its owner, American Tower, is also headquartered in the United States.
Since when has American Tower owned CoreSite?
American Tower has owned CoreSite since 2021.
Is CoreSite still owned by American Tower?
Yes. As of 15 October 2026, CoreSite is still owned by American Tower (71% stake). 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] American Tower Corporation Annual Report on Form 10-K filed 2026-02-24 — SEC EDGAR, SEC Form 10-K, published 24 February 2026; retrieved 15 October 2026.
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