Private company

Colt Technology Services

Logo: COLT-Telecom-Logo.gif : Colt Technology Services derivative work: Froysel ( talk ), Public domain, via Wikimedia Commons4

Multinational telecommunications and data centre services company

Colt Technology Services Group Limited (formerly COLT Telecom Group S.A.) is a multinational telecommunications company headquartered in London, United Kingdom. It was listed on the London Stock Exchange and was a constituent of the FTSE 250 Index until it was acquired by Fidelity Investments in August 2015. Colt was originally an acronym for City Of London Telecommunications.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 20, 2026.

Overview

1992Founded1
  • Industrytelecommunications industry1
  • HeadquartersLondon1
  • Websitewww.colt.net
  • Legal formjoint-stock company1
  • Listed onLondon Stock Exchange1
  • Slogan“We put the power of the digital universe in the hands of our customers, wherever, however and whenever they want. We are the digital infrastructure company that the world’s leading businesses choose to connect with.”1
  • LEI3912000PY0VABHVJX6793
  • StatusActive3
  • LEI statusIssued and current3
  • Registered addressColt House, 20 Great Eastern Street, EC2A 3EH London, United Kingdom3
  • Registered withCompanies House, 024527363

Colt Technology Services Group Limited (formerly COLT Telecom Group S.A.) is a multinational telecommunications company headquartered in London, United Kingdom. It was listed on the London Stock Exchange and was a constituent of the FTSE 250 Index until it was acquired by Fidelity Investments in August 2015. Colt was originally an acronym for City Of London Telecommunications.2

Corporate structure

Colt Technology Services is part of a group headed by Fidelity Investments. 1,794 entities, 30 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

  • Fidelity Investments Boston, Massachusetts, United States
    • Colt Technology Services London, United Kingdom
    • DEVONSHIRE ENERGY LLC Boston, Massachusetts, United States
    • FIDELITY DIGITAL ASSETS, LTD London, United Kingdom
    • Fidelity Digital Assets, National Association Boston, Massachusetts, United States
    • Fidelity Diversifying Solutions LLC Wilmington, Delaware, United States
      • Fidelity Private Credit Fund Wilmington, Delaware, United States
      • Fidelity Cherry Street Trust Fund · Wilmington, Delaware, United States
      • Fidelity Credit Opportunities Fund II LP Fund · Wilmington, Delaware, United States
      • Fidelity Diversified Alpha Master Fund LP Fund · Wilmington, Delaware, United States
      • Fidelity Dynamic Buffered Equity ETF Fund · Wilmington, Delaware, United States
      • FIDELITY EV PRIVATE CREDIT CLO 1 LLC Fund · Wilmington, Delaware, United States
      • FIDELITY EVERGREEN PRIVATE CREDIT FUND BSPV LLC Fund · Wilmington, Delaware, United States
      • Fidelity Evergreen Private Credit Fund LP Fund · Wilmington, Delaware, United States
      • FIDELITY EVERGREEN PRIVATE CREDIT MASTER FUND BSPV LLC Fund · Wilmington, Delaware, United States
      • Fidelity Evergreen Private Credit Master Fund LP Fund · Wilmington, Delaware, United States
        • 1 more
      • Fidelity Floating Rate Opportunities Fund Fund · Wilmington, Delaware, United States
      • Fidelity Greenwood Street Trust Fund · Wilmington, Delaware, United States
        • 1 more
      • FIDELITY GROWTH COMPANY PRIVATE INVESTMENTS PORTFOLIO LLC Fund · Wilmington, Delaware, United States
      • Fidelity Hedged Equity Central Fund Fund · Wilmington, Delaware, United States
      • Fidelity Hedged Equity ETF Fund · Wilmington, Delaware, United States
      • Fidelity Macro Opportunities Fund Fund · Wilmington, Delaware, United States
      • Fidelity Managed Futures ETF Fund · Wilmington, Delaware, United States
      • Fidelity Multi-Strategy Credit Fund Fund · Wilmington, Delaware, United States
      • FIDELITY PRIVATE CREDIT COMPANY II LLC Fund · Wilmington, Delaware, United States
      • Fidelity Private Credit Fund BSPV LLC Fund · Wilmington, Delaware, United States
      • FIDELITY PRIVATE CREDIT SC LLC Fund · Wilmington, Delaware, United States
      • Fidelity Real Estate Debt Opportunities Fund II, LP Fund · Wilmington, Delaware, United States
      • Fidelity REDOF II REIT, LLC Fund · Wilmington, Delaware, United States
      • Fidelity Risk Parity Fund Fund · Wilmington, Delaware, United States
      • Fidelity SAI Alternative Risk Premia Commodity Strategy Fund Fund · Wilmington, Delaware, United States
      • and 16 more
    • FIDELITY GLOBAL BROKERAGE GROUP, INC. Boston, Massachusetts, United States
    • Fidelity Institutional Wealth Adviser LLC Boston, Massachusetts, United States
    • Fidelity Product Services LLC Wilmington, Delaware, United States
    • FIDELITY SERVICE COMPANY, INC. Boston, Massachusetts, United States
    • FIMM, LLC Boston, Massachusetts, United States
      • FIMM FUND A LLC Subsidiary · Wilmington, Delaware, United States
    • FISC-IRELAND LIMITED Dublin, Ireland
    • GREEN PIER FINTECH LLC Boston, Massachusetts, United States
    • NATIONAL FINANCIAL SERVICES LLC Wilmington, Delaware, United States
    • STRATEGIC ADVISERS LLC Boston, Massachusetts, United States
      • FIDELITY RUTLAND SQUARE TRUST II Fund · Wilmington, Delaware, United States
        • 2 more
      • Fidelity Rutland Square Trust II - Strategic Advisers Growth Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Alternatives Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Core Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Core Income Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Emerging Markets Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Emerging Markets Fund of Funds Fund · Wilmington, Delaware, United States
      • Strategic Advisers Fidelity Alternatives Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Fidelity Core Income Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Fidelity Emerging Markets Fund Fund · Boston, Massachusetts, United States
      • Strategic Advisers Fidelity International Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Fidelity Short Duration Fund (Strategic Advisers® Fidelity® Short Duration Fund) Fund · Wilmington, Delaware, United States
      • Strategic Advisers Fidelity U.S. Total Stock Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Growth Multi-Manager Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Income Opportunities Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Income Opportunities Fund of Funds Fund · Wilmington, Delaware, United States
      • Strategic Advisers International Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Large Cap Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Short Duration Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Small-Mid Cap Multi-Manager Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Tax-Sensitive Short Duration Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers U.S. Total Stock Fund Fund · Wilmington, Delaware, United States
      • Strategic Advisers Value Fund Fund · Wilmington, Delaware, United States
    • Maisons du Monde Subsidiary · Vertou, France
      • 1 more
    • Revlon Subsidiary · New York, New York, United States
      • 2 more
    • Yield10 Bioscience Subsidiary · Cambridge, Massachusetts, United States
    • Sika AG Stake · 15.9% · Baar, Switzerland
      • 10 more
    • Skechers Stake · 14.9% · Manhattan Beach, California, United States
      • 104 more
    • Allegro MicroSystems Stake · 14.7% · Manchester, New Hampshire, United States
      • Voxtel (United States) Subsidiary · Beaverton, United States
      • Allegro MicroSystems Argentina S.A. Sucursal Uruguay Subsidiary · Uruguay
      • Allegro MicroSystems Argentina, S.A. Subsidiary · Argentina
      • Allegro MicroSystems Business Development, Inc. Subsidiary · Delaware, United States
      • Allegro MicroSystems Europe Limited Subsidiary · United Kingdom
      • Allegro MicroSystems France SAS Subsidiary · France
      • Allegro MicroSystems Germany GmbH Subsidiary · Germany
      • Allegro MicroSystems Ireland Ltd Subsidiary · Ireland
      • Allegro MicroSystems Japan GK Subsidiary · Japan
      • ALLEGRO MICROSYSTEMS MARKETING INDIA PRIVATE LIMITED Subsidiary · Pune, India
      • Allegro MicroSystems Philippines Realty Inc. Subsidiary · Philippines
      • Allegro MicroSystems Philippines, Inc. Subsidiary · Philippines
      • Allegro MicroSystems Shanghai Co., Ltd. Subsidiary · China
      • CrivaSense Technologies SAS Subsidiary · France
      • LadarSystems, LLC Subsidiary · Wyoming, United States
      • Voxtel, LLC Subsidiary · Delaware, United States
    • onsemi Stake · 11.9% · Scottsdale, Arizona, United States
      • 12 more
    • Empire State Realty Trust Stake · 10.3% · New York, New York, United States
      • 1 more
    • Tesla Stake · 10.2% · Austin, Texas, United States
      • 412 more
    • GlobalFoundries Stake · 9.35% · George Town, Grand Cayman, Cayman Islands
      • 5 more
    • Vistra Stake · 7.64% · Irving, Texas, United States
      • 42 more
    • and 20 more

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries listed in Exhibit 21 of annual reports filed with the SEC; subsidiaries, stakes and holdings from Wikidata (CC0). Each entity in the chart links to its source.

The story

Colt was founded as City Of London Telecommunications in 1992 by James Hynes, with funds provided by Fidelity Investments. The company began to construct a telecoms network in London. In 1993 it was awarded a licence to compete with British Telecom and Cable and Wireless in voice and data transmission. It was first listed on the London Stock Exchange in 1996. The group later expanded into Europe, building networks in major European cities over the next 10 years.

In 2001, Fidelity helped the company raise a further £400m in financing, and acquired a majority share in it as part of a bailout agreement. In April 2009, Colt completed an open offer, raising €199.1m before expenses.

In May 2011 the company acquired a majority share in MarketPrizm, a provider of low-latency market data and trading infrastructure services. In August 2012 Colt acquired a majority share in ThinkGrid, a cloud platform for delivery of hosted services. On 12 November 2014, Colt acquired KVH, a Japanese telecoms company, helping Colt expand in the growing Asian market. In August 2015 the company was fully acquired by Fidelity. On 2 November 2022, Colt agreed to acquire Lumen Technologies' Europe, Middle East and Africa (EMEA) business for $1.8 billion.

In August 2025, the company suffered a cyber attack in which the attacker was able to access customer data.

From Wikipedia’s article on Colt Technology Services, shared under CC BY-SA 4.0.5

Subsidiaries and ownership

Parent company

From Wikidata.1

Timeline

  1. 1992Founded Founded1