| 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 |
| Siemens Low Voltage & Products | 🇺🇸 | 2014-02-25 | 2015-11-17 | 1 |
| Siemens Ltd. | 🇦🇺 | 2013-11-12 | 2015-11-17 | 1 |
| Siemens Mobility GmbH - MO TI SPA | 🇩🇪 | 2018-11-16 | 2018-11-16 | 1 |
| Siemens Mobility Limited | 🇬🇧 | 2012-10-05 | 2019-12-12 | 1 |
| Siemens Network Convergence LLC | 🇺🇸 | 1998-04-22 | 2015-11-17 | 1 |
| Siemens Numerical Control Ltd., Nanjing | 🇨🇳 | 2007-04-09 | 2022-08-02 | 2 |
| Siemens NV (Belgium) | 🇧🇪 | 2004-04-15 | 2015-11-17 | 1 |
| Siemens Rail Automation SAU | 🇪🇸 | 2022-07-27 | 2022-07-27 | 1 |
| Siemens Sensors & Communication Ltd. | 🇨🇳 | 2025-11-28 | 2025-11-28 | 1 |
| Siemens Switzerland Ltd., I B T HVP | 🇨🇭 | 1998-04-22 | 2015-11-17 | 1 |
| SIEMENS TELECOMMUNICATION SYSTEMS LIMITED | 🇹🇼 | 2000-11-09 | 2015-11-17 | 1 |
| Siemon | 🇺🇸 | 2007-10-05 | 2015-11-17 | 1 |
| Sienda Multimedia Ltd | 🇬🇧 | 2025-03-31 | 2025-03-31 | 1 |
| Sienda New Media Technologies GmbH | 🇨🇭 | 2014-11-04 | 2016-02-18 | 1 |
| SiEngine Technology Co., Ltd. | 🇨🇳 | 2022-02-23 | 2022-02-23 | 1 |
| Sienna Corporation | 🇺🇸 | 2016-02-18 | 2016-02-18 | 1 |
| Sieper Lüdenscheid GmbH & Co. KG | 🇩🇪 | 2018-02-15 | 2018-02-15 | 1 |
| Sierra Automated Systems | 🇺🇸 | 2001-10-24 | 2015-11-17 | 1 |
| SIERRA MONITOR CORP. | 🇺🇸 | 2000-11-09 | 2015-11-17 | 1 |
| Sierra Nevada Corporation | 🇺🇸 | 2015-04-29 | 2017-09-27 | 2 |
| Sierra Pacific Innovations Corp | 🇺🇸 | 2017-01-07 | 2017-01-07 | 1 |
| Sierra Video Systems | 🇺🇸 | 2011-02-21 | 2015-08-29 | 1 |
| Sierra Wireless, ULC | 🇨🇦 🇬🇧 | 1998-04-22 | 2024-12-09 | 6 |
| SierraCom | 🇺🇸 | 2000-11-09 | 2015-11-17 | 1 |
| Sietron Elektronik | 🇩🇪 | 2011-02-21 | 2015-08-29 | 1 |
| SiFive Inc | 🇺🇸 | 2018-02-15 | 2025-01-07 | 4 |
| SIFROM Inc. | 🇺🇸 | 2013-11-12 | 2015-11-17 | 1 |
| Sify Technologies Ltd | 🇮🇳 | 2014-04-22 | 2015-11-17 | 1 |
| SiGarden Sp z o.o. | 🇵🇱 | 2011-02-21 | 2015-08-29 | 1 |
| SIGFOX | 🇫🇷 | 2016-02-05 | 2016-02-05 | 1 |
| SightLine Applications | 🇺🇸 | 2017-04-18 | 2017-04-18 | 1 |
| SightLogix, Inc. | 🇺🇸 | 2006-04-21 | 2015-11-17 | 1 |
| SIGLEAD INC | 🇯🇵 | 2014-11-04 | 2016-02-18 | 1 |
| SIGLENT TECHNOLOGIES CO., LTD. | 🇨🇳 | 2018-12-16 | 2018-12-16 | 1 |
| Sigma Bilisim Sist. Tekn. Elk. Enj. ve San. D??. Tic. Ltd. ?ti. | 🇹🇷 | 2022-12-20 | 2022-12-20 | 1 |