| Siconix Inc. | 🇨🇦 | 2011-06-05 | 2015-11-17 | 1 |
| SiConnect | 🇬🇧 | 2000-11-09 | 2015-11-17 | 1 |
| SiCortex, Inc | 🇺🇸 | 2005-03-17 | 2015-11-17 | 1 |
| SICPA SA - GSS | 🇨🇭 | 2017-03-08 | 2022-08-16 | 1 |
| SICS Swedish ICT | 🇸🇪 | 2016-09-06 | 2016-09-06 | 1 |
| SID INFORMATICA | 🇧🇷 | 1998-04-22 | 2015-11-17 | 1 |
| Sidora Srl | 🇮🇹 | 2024-02-07 | 2024-02-07 | 1 |
| SIDSA | 🇪🇸 | 2005-03-22 | 2015-11-17 | 1 |
| Sidus Novum Sp. z o. o. | 🇵🇱 | 2016-02-05 | 2016-02-05 | 1 |
| SIDUS Solutions, LLC | 🇺🇸 | 2024-05-07 | 2024-05-07 | 1 |
| SieAmp Group of Companies | 🇺🇸 | 2008-10-25 | 2015-11-17 | 1 |
| SIEB & MEYER AG | 🇩🇪 | 2000-11-09 | 2015-11-17 | 1 |
| Sieb & Meyer AG | 🇩🇪 | 2019-08-09 | 2019-08-09 | 1 |
| Siebert Industrieelektronik GmbH | 🇩🇪 | 2016-10-03 | 2016-10-03 | 1 |
| SIECOR CORPORATION | 🇺🇸 | 2000-11-09 | 2015-11-17 | 1 |
| Siegmar Zander HuSWare | 🇩🇪 | 2013-05-16 | 2015-08-29 | 1 |
| Sielox LLC | 🇺🇸 | 2008-10-25 | 2015-11-17 | 1 |
| Siema Applications | 🇫🇷 | 2019-03-14 | 2019-03-14 | 1 |
| SIEMENS AG | 🇩🇪 | 1998-04-22 | 2025-09-19 | 8 |
| Siemens AG | 🇩🇪 | 2000-11-09 | 2025-06-25 | 12 |
| Siemens AG, | 🇩🇪 | 2007-01-16 | 2015-11-17 | 1 |
| Siemens AG Austria | 🇦🇹 | 2004-06-05 | 2018-04-05 | 2 |
| Siemens AG, Automations & Drives, | 🇩🇪 | 2018-07-22 | 2018-07-22 | 1 |
| Siemens AG, DI PA AE | 🇩🇪 | 2016-02-05 | 2023-07-20 | 1 |
| SIEMENS AG, Digital Factory, Motion Control System | 🇬🇧 | 2017-09-06 | 2017-09-06 | 1 |
| Siemens AG Energy Management Division | 🇩🇪 | 2016-02-10 | 2016-02-10 | 1 |
| Siemens AG, Healthcare Sector | 🇩🇪 | 2010-01-05 | 2015-11-17 | 1 |
| Siemens AG I IA PP PRM | 🇩🇪 | 2012-10-05 | 2015-11-17 | 1 |
| Siemens AG ICM MP UC RD IT KLF1 | 🇩🇪 | 2003-06-01 | 2015-11-17 | 1 |
| Siemens AG, MO MLT BG | 🇦🇹 | 2016-08-25 | 2016-08-25 | 1 |
| Siemens AG, Sector Industry, Drive Technologies, Motion Control Systems | 🇩🇪 | 2008-02-22 | 2015-11-17 | 1 |
| Siemens AG - Siemens Deutschland Mobility | 🇩🇪 | 2018-02-15 | 2018-02-15 | 1 |
| Siemens AG, Transportation Systems | 🇩🇪 | 2006-08-15 | 2015-11-17 | 1 |
| SIEMENS AS | 🇳🇴 | 2016-02-18 | 2016-02-18 | 1 |
| SIEMENS BUILDING | 🇺🇸 | 1998-04-22 | 2015-11-17 | 1 |
| Siemens Building Technologies AG, | 🇨🇭 | 2001-02-02 | 2015-11-17 | 1 |
| Siemens Canada | 🇨🇦 | 2018-10-13 | 2024-11-15 | 2 |
| Siemens Canada Limited | 🇨🇦 | 2020-11-10 | 2020-11-10 | 1 |
| Siemens Convergence Creators GmbH&Co.KG | 🇩🇪 | 2011-03-17 | 2015-11-17 | 1 |
| SIEMENS ENERGY AUTOMATION | 🇮🇳 | 2013-09-12 | 2015-11-17 | 1 |
| Siemens Energy Global GmbH & Co. KG | 🇩🇪 | 2023-08-11 | 2024-01-19 | 2 |
| Siemens Energy Global GmbH & Co.KG - GT PRM | 🇩🇪 | 2023-08-16 | 2023-08-16 | 1 |
| Siemens Healthcare Diagnostics | 🇺🇸 | 2014-11-04 | 2016-02-18 | 1 |
| Siemens Healthcare Diagnostics, Inc | 🇺🇸 | 2013-09-12 | 2015-11-17 | 1 |
| Siemens Healthcare Diagnostics Manufacturing Ltd | 🇬🇧 | 2006-06-13 | 2015-11-17 | 1 |
| Siemens Home & Office Comm. Devices | 🇺🇸 | 2002-10-14 | 2019-07-02 | 3 |
| Siemens Industrial Automation Products Ltd., Chengdu | 🇨🇳 | 2013-03-28 | 2025-05-07 | 4 |
| Siemens Industries, Inc, Retail & Commercial Systems | 🇺🇸 | 2014-04-14 | 2016-02-18 | 1 |
| Siemens Industry, Inc. | 🇺🇸 | 2010-01-05 | 2019-07-02 | 1 |
| Siemens Industry Software Inc. | 🇺🇸 | 2017-07-23 | 2021-05-20 | 2 |