| Company Name | Entity type | Parent/Subsidiary/Independent | Headquarters | No. of Employees | Annual Revenue ($M) | |
|---|---|---|---|---|---|---|
| T-Systems International GmbH | Private | Subsidiary (of Deutsche Telekom AG ) | Germany | XYZ | XYZ | |
| T-Systems Slovakia sro | Private | Subsidiary (of Deutsche Telekom AG ) | Slovakia | XYZ | XYZ | |
| T-Systems Multimedia Solutions Gmbh | Private | Subsidiary (of T-Systems International GmbH ) | Germany | XYZ | XYZ | |
| AT&T Inc | Public | United States of America | 149,900 | 122,428 | ||
| T & T SYSTEMS Srl | Private | Independent | Italy | XYZ | XYZ | |
| T-Systems Hungary Kft. | Private | Independent | Hungary | XYZ | XYZ | |
| T-Systems CIS, Ooo | Private | Independent | Russia | XYZ | XYZ | |
| T-Systems France SAS | Private | Subsidiary (of T-Systems International GmbH ) | France | XYZ | XYZ | |
| T-Mobile US Inc | Public | Subsidiary (of Deutsche Telekom AG) | United States of America | 67,000 | 78,558 | |
| T-Systems North America Inc | Private | Subsidiary (of Deutsche Telekom AG ) | United States of America | XYZ | XYZ | |
| T-Systems South Africa Pty Ltd | Private | Subsidiary (of Deutsche Telekom AG ) | South Africa | XYZ | XYZ | |
| J & T Systems, Inc. | Private | Independent | United States of America | XYZ | XYZ | |
| T-Systems Nederland b.v. | Private | Subsidiary (of Deutsche Telekom AG ) | Netherlands | XYZ | XYZ | |
| T-Systems ICT S.R.L. | Private | Independent | Romania | XYZ | XYZ | |
| T-Systems International, Inc. | Private | Subsidiary (of Deere & Co ) | United States of America | XYZ | XYZ | |
| A&T Systems Inc | Private | Independent | United States of America | XYZ | XYZ | |
| T-Systems Austria GesmbH | Private | Subsidiary (of Deutsche Telekom AG ) | Austria | XYZ | XYZ | |
| Samsung C&T Corp | Public | Parent | South Korea | 12,083 | 32,093 | |
| T-Systems Ltd | Private | Subsidiary (of Deutsche Telekom AG ) | United Kingdom | XYZ | XYZ | |
| T-Systems ITC Iberia, s.a.u. | Private | Subsidiary (of Deutsche Telekom AG ) | Spain | XYZ | XYZ | |
| T-Systems Malaysia Sdn. Bhd | Private | Subsidiary (of BT Group Plc ) | Malaysia | XYZ | XYZ | |
| B S T Systems, Inc. | Private | Independent | United States of America | XYZ | XYZ | |
| T&D Holdings Inc | Public | Parent | Japan | 20,336 | 20,782 | |
| Cisco Systems Inc | Public | Parent | United States of America | 84,900 | 56,998 | |
| T-Systems Mexico, S.A. De C.V. | Private | Independent | Mexico | XYZ | XYZ | |
| M&T Bank Corp | Public | Parent | United States of America | 21,736 | 12,752 | |
| BAE Systems Plc | Public | Parent | United Kingdom | 99,800 | 28,693 | |
| J&T Global Express Ltd | Public | Independent | China | XYZ | XYZ | |
| T-Systems Singapore Pte Ltd | Private | Subsidiary (of Deutsche Telekom AG ) | Singapore | XYZ | XYZ | |
| BAE Systems Inc | Private | Subsidiary (of BAE Systems Plc) | United States of America | 35,000 | 12,500 | |
| HUAYU Automotive Systems Co Ltd | Public | Subsidiary (of SAIC Motor Corp Ltd ) | China | XYZ | XYZ | |
| Vestas Wind Systems AS | Public | Parent | Denmark | 30,586 | 16,635 | |
| T. Rowe Price Group Inc | Public | Parent | United States of America | 7,906 | 6,461 | |
| Larsen & Toubro Ltd | Public | Parent | India | 49,039 | 23,351 | |
| Hanon Systems | Public | Subsidiary (of Hahn and Co Auto Holdings Co Ltd ) | South Korea | 2,136 | 7,323 | |
| T-GAIA Corp | Public | Subsidiary (of Sumitomo Corp) | Japan | 4,955 | 3,351 | |
| Truist Financial Corp | Public | Parent | United States of America | 49,037 | 33,246 | |
| Community Health Systems Inc | Public | Parent | United States of America | 61,000 | 12,490 | |
| IEIT SYSTEMS Co Ltd | Public | Parent | China | XYZ | XYZ | |
| Northrop Grumman Aeronautics Systems | Private | Subsidiary (of Northrop Grumman Corp ) | United States of America | XYZ | XYZ | |
| Cablevision Systems Corporation | Private | Subsidiary (of Altice Europe NV (Inactive) ) | United States of America | XYZ | XYZ | |
| Lockheed Martin Rotary and Mission Systems | Private | Subsidiary (of Lockheed Martin Corp ) | United States of America | XYZ | XYZ | |
| Elbit Systems Ltd | Public | Parent | Israel | 18,984 | 5,975 | |
| EPAM Systems Inc | Public | United States of America | 53,150 | 4,691 | ||
| Hitachi Systems Ltd | Private | Subsidiary (of Hitachi Ltd ) | Japan | XYZ | XYZ | |
| Abaco Systems Inc | Private | Subsidiary (of AMETEK Inc ) | United States of America | XYZ | XYZ | |
| L&T Finance Ltd | Public | Subsidiary (of Larsen & Toubro Ltd) | India | 27,506 | 1,694 | |
| Axalta Coating Systems Ltd | Public | Parent | United States of America | 12,000 | 5,184 | |
| Comfort Systems USA Inc | Public | Parent | United States of America | 15,800 | 5,207 | |
| Northrop Grumman Innovation Systems Inc | Private | Subsidiary (of Northrop Grumman Corp ) | United States of America | XYZ | XYZ |
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