Who owns Thunderbird?
Thunderbird is owned by Mozilla (the United States).[1]
This ownership is reported in official statements but has not yet been matched to a regulatory filing.
Evidence: Mozilla Foundation and Subsidiaries consolidated financial statements, December 31, 2023 and 2022. Last checked .
Key facts
- Current owner
- Mozilla Foundation reported
- Owner HQ
- 🇺🇸 United States, San Francisco
- Origin
- 🇺🇸 United States
- Category
- Internet & digital › Digital services › Email & messaging
- Last verified
- · 1 sources
About Thunderbird
Thunderbird is the email application that Mozilla's products page describes as bringing email, calendars and contacts together in one app. Its development is run through MZLA Technologies Corporation, one of the Mozilla Foundation's wholly-owned for-profit subsidiaries, which the foundation's statements describe as headquartered in San Francisco, and which is separate from Mozilla Corporation, the Firefox publisher.
Ownership timeline of Thunderbird
Where Thunderbird sits in Mozilla
Controlling ownership as of . Brands grouped under the entity that owns them; large groups are collapsed.
Open the full Mozilla ownership tree →
See the full Mozilla brand portfolio (5) →
Other brands owned by Mozilla
Mozilla controls 5 brands on Brandtree, 5 of them in internet & digital.
Also in internet & digital
Other brands in email & messaging, and who owns them
The 18 brands in email & messaging on Brandtree belong to 14 owners. The largest is Snap, with 2; Mozilla has 2.
About the owner: Mozilla
Mozilla is a trust-owned company headquartered in San Francisco, United States, founded in 2003. Brandtree records 5 brands under its control.
Mozilla Foundation is a California not-for-profit corporation, established in July 2003 and headquartered in San Francisco, which owns several wholly-owned for-profit subsidiaries. Mozilla Corporation provides the open-source software and services, MZLA Technologies Corporation promotes choice and innovation on the internet, and the group also names Mozilla Ventures and Mozilla.ai. Its consolidated statements say Firefox generates royalties from search-engine partners that appear in the browser.
🇺🇸 Thunderbird 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; Thunderbird is not one of them.
Frequently asked questions
Who is the parent company of Thunderbird?
The parent company of Thunderbird is Mozilla, a trust-owned company headquartered in the United States.
Is Thunderbird American?
Yes. Thunderbird originated in the United States and its owner, Mozilla, is also headquartered in the United States.
Is Thunderbird still owned by Mozilla?
Yes. As of 4 October 2026, Thunderbird is still owned by Mozilla. 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] Mozilla Foundation and Subsidiaries consolidated financial statements, December 31, 2023 and 2022 — Mozilla Foundation, Annual report; retrieved 4 October 2026.
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