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Private company

System1

Logo: system1.com3

Advertising and digital assets holding company

System1 is an American Internet advertising company. Formerly known as OpenMail, it was founded in 2013.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

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System1 is an American Internet advertising company. Formerly known as OpenMail, it was founded in 2013.2

Corporate structure

System1 sits at the top of its group. 3 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

  • System1

Built from subsidiaries, stakes and holdings from Wikidata (CC0); major holders from Schedules 13D and 13G. Each entity in the chart links to its source.

What it owns

What System1 reports owning in its annual reports to the SEC: buildings, land and equipment, real estate and locations, investments, intangible assets and inventory, at the end of its latest fiscal year and a year before.

Stakes and holdings (Wikidata)

Things Wikidata records the company as owning, with the share when stated.1

Subsidiaries and ownership

Subsidiaries

  • Privacy One

Also owns

From Wikidata.1

Acquisitions

  1. 2019Acquired MapQuest Inc.1

Sources

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

  1. 1
  2. 2
  3. 3
    Company websiteSystem1 logo