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Whisper Systems

Defunct American mobile security company

Whisper Systems was an American enterprise mobile security company that was co-founded by security researcher Moxie Marlinspike and roboticist Stuart Anderson in 2010. The company was acquired by Twitter in November 2011.2 Its products include TextSecure and RedPhone.1 It is part of Twitter, Inc.1 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

2010Founded1

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Whisper Systems was an American enterprise mobile security company that was co-founded by security researcher Moxie Marlinspike and roboticist Stuart Anderson in 2010. The company was acquired by Twitter in November 2011.2

Corporate structure

Whisper Systems is part of a group headed by Twitter, Inc.. 2 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

  • Twitter, Inc. San Francisco, California, United States
    • Whisper Systems San Francisco

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries, stakes and holdings from Wikidata (CC0). Each entity in the chart links to its source.

The story

Founded by Moxie Marlinspike in 2010.1

Leadership

Who has led Whisper Systems, and when. Pick a name to see everywhere that person has worked.

Products and brands

  • RedPhone
  • TextSecure

Listed on Wikidata.1

Subsidiaries and ownership

Parent company

From Wikidata.1

Timeline

  1. Nov 2011Acquired Acquired by Twitter, Inc.1
  2. 2010Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

  1. 1
  2. 2