# 29 leading companies with in-house R&D in Plano

Tamtam tracks 29 companies with in-house R&D headquartered in Plano. This list ranks all of them by number of employees on LinkedIn, led by NTT DATA North America, Toyota North America and Siemens Digital Industries Software. Their median headcount is 742. Half of them were founded in 1999 or later.

These Plano-based companies are involved in various technology sectors, with a strong presence in software development, telecommunications, and medical equipment manufacturing. The list includes large corporations like NTT DATA North America, which provides IT consulting and AI solutions, and Toyota North America, known for motor vehicle manufacturing. Siemens Digital Industries Software offers digital transformation tools, while Tyler Technologies specializes in software for government entities.

A notable pattern among these companies is their focus on advanced technological solutions. Many of them, such as Trellix in cybersecurity and Diodes Incorporated in semiconductor manufacturing, are key players in their respective fields, indicating Plano as a hub for diverse R&D activities across both established industries and newer tech ventures.

🇺🇸 Plano · 29 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [NTT DATA North America](https://www.tamtam.ai/c/ntt-data-north-america) (us.nttdata.com)<br>provides business and technology consulting, data and AI solutions, application development, infrastructure management, and industry-specific services globally | IT Services and IT Consulting | 🇺🇸 Plano | 24,414 |  |
| 2 | [Toyota North America](https://www.tamtam.ai/c/toyota-north-america) (toyota.com)<br>Manufacturing high-quality vehicles while prioritizing people, career growth, and leading innovations in future mobility solutions for everyone. | Motor Vehicle Manufacturing | 🇺🇸 Plano | 22,666 | 1957 |
| 3 | [Siemens Digital Industries Software](https://www.tamtam.ai/c/siemens-digital-industries-software) (siemens.com)<br>The company helps organizations digitally transform using Siemens Xcelerator platform, optimizing design, engineering, and manufacturing processes to create sustainable products | Software Development | 🇺🇸 Plano | 20,925 |  |
| 4 | [Tyler Technologies](https://www.tamtam.ai/c/tyler-technologies) (tylertech.com)<br>Provides integrated software and technology services enabling government entities to operate efficiently, transparently, and connect data across systems. | Software Development | 🇺🇸 Plano | 7,873 |  |
| 5 | [Siemens PLM Software (inactive)](https://www.tamtam.ai/c/siemens-plm-software-inactive) (sw.siemens.com)<br>Drives enterprise transformation, enabling digital engineering, manufacturing, electronics design. Solutions create digital twins providing insights, automation for innovation for companies. | Software Development | 🇺🇸 Plano | 4,233 |  |
| 6 | [Ribbon Communications](https://www.tamtam.ai/c/ribbon-communications) (ribboncommunications.com)<br>Provides communications software, IP and optical networking solutions for service providers, enterprises, and critical infrastructure with modern, scalable, and secure technologies. | Telecommunications | 🇺🇸 Plano | 4,092 |  |
| 7 | [Trellix](https://www.tamtam.ai/c/trellix) (trellix.com)<br>Delivers intelligence-led cyber resilience for security-conscious organizations. Transforms threat intelligence into high-fidelity detections and automates AI-driven detection and response across diverse environments. | Computer and Network Security | 🇺🇸 Plano | 3,827 | 2022 |
| 8 | [Integer Holdings Corporation](https://www.tamtam.ai/c/integer-holdings-corporation) (integer.net)<br>Provides contract development and manufacturing for medical devices, focusing on cardiac rhythm, neuromodulation, and cardio/vascular markets. Supplies innovative, high-quality products to medical companies. | Medical Equipment Manufacturing | 🇺🇸 Plano | 3,810 | 1940 |
| 9 | [Hilti North America](https://www.tamtam.ai/c/hilti-north-america) (hilti.com)<br>Providing innovative tools, fasteners, software, and services to enhance construction speed, safety, and sustainability for professionals. | Construction | 🇺🇸 Plano | 3,241 | 1941 |
| 10 | [Communications & Power Industries (CPI)](https://www.tamtam.ai/c/communications-and-power-industries-cpi) (cpii.com)<br>Global manufacturer of electronic components for communications and defense markets, specializing in innovative technology solutions for commercial and military applications worldwide | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Plano | 1,612 | 1995 |
| 11 | [ECI Telecom](https://www.tamtam.ai/c/eci-telecom) (rbbn.com)<br>Global communications software and network solutions provider for service providers, enterprises, and critical infrastructure sectors, offering innovative end-to-end solutions for modernizing networks | Telecommunications | 🇺🇸 Plano | 1,513 | 1961 |
| 12 | [Diodes Incorporated](https://www.tamtam.ai/c/diodes-incorporated) (diodes.com)<br>Global semiconductor manufacturer providing high-quality products to automotive, industrial, computing, consumer electronics, and communications markets, with a focus on application-specific solutions | Semiconductor Manufacturing | 🇺🇸 Plano | 1,303 | 1959 |
| 13 | [Siemens Healthineers](https://www.tamtam.ai/c/siemens-healthineers-plano) (siemens.com)<br>Innovative team of engineers specialized in computer vision technology, focused on developing imaging systems for early cancer detection and breast density assessment | Medical Equipment Manufacturing | 🇺🇸 Plano | 1,020 | 2000 |
| 14 | [Airspan Networks](https://www.tamtam.ai/c/airspan-networks) (airspan.com)<br>Provider of innovative software and hardware for 5G networks, pioneering in Open RAN solutions for seamless connectivity globally | Telecommunications | 🇺🇸 Plano | 770 | 1992 |
| 15 | [Argon Medical Devices, Inc.](https://www.tamtam.ai/c/argon-medical-devices-inc) (argonmedical.com)<br>Manufacturing specialty medical devices for interventional radiology, vascular surgery, interventional cardiology, and oncology, improving patient outcomes through image-guided procedures. | Medical Equipment Manufacturing | 🇺🇸 Plano | 742 | 1972 |
| 16 | [Polestar Analytics](https://www.tamtam.ai/c/polestar-analytics) (polestaranalytics.com)<br>Specializing in analytics and AI, this organization helps businesses leverage data for valuable insights through a wide range of services | Business Consulting and Services | 🇺🇸 Plano | 693 | 2012 |
| 17 | [Payoda Technology Inc](https://www.tamtam.ai/c/payoda-technology-inc) (payoda.com)<br>Digital transformation partner offering technology solutions and services to global businesses with expertise in end-user research, design, engineering, and analytics Delivering scalable software solutions worldwide | IT Services and IT Consulting | 🇺🇸 Plano | 663 | 2005 |
| 18 | [Silverfort](https://www.tamtam.ai/c/silverfort) (silverfort.com)<br>Provides an end-to-end identity security platform, protecting all identities, human and machine, across on-premise and cloud environments, minimizing attack surfaces. | Computer and Network Security | 🇺🇸 Plano | 634 | 2016 |
| 19 | [GENBAND](https://www.tamtam.ai/c/genband) (rbbn.com)<br>A global leader in real-time communications technology, transforming networks to secure IP and cloud-based architectures for highly productive consumer and business communication | Telecommunications | 🇺🇸 Plano | 610 | 1999 |
| 20 | [Imagine Communications](https://www.tamtam.ai/c/imagine-communications) (imaginecommunications.com)<br>The company develops technologies for media companies to deliver content anywhere, anytime, on any device using scalable, software-based solutions | Broadcast Media Production and Distribution | 🇺🇸 Plano | 569 |  |
| 21 | [Softweb Solutions Inc. - An Avnet Company](https://www.tamtam.ai/c/softweb-solutions-inc-an-avnet-company) (softwebsolutions.com)<br>AI software development, IoT applications, data services, digital transformation, cognitive bots, extended reality, custom apps, enterprise mobility, marketing automation. | IT Services and IT Consulting | 🇺🇸 Plano | 420 | 2006 |
| 22 | [Toyota Connected North America](https://www.tamtam.ai/c/toyota-connected-north-america) (toyotaconnected.com)<br>Development of connected automotive products and services enhancing mobility experiences, fostering innovation, and supporting a diverse, inclusive workplace culture. | Software Development | 🇺🇸 Plano | 408 | 2016 |
| 23 | [DZS](https://www.tamtam.ai/c/dzs) (dzsi.com)<br>A global leader in broadband connectivity and cloud software, specializing in helping service providers deliver optimal subscriber experiences | Telecommunications | 🇺🇸 Plano | 287 |  |
| 24 | [Tvarana](https://www.tamtam.ai/c/tvarana) (tvarana.com)<br>Specializing in customizing, implementing, and enhancing cloud technology, particularly Salesforce, Netsuite, Amazon, and Heroku, to meet specific business needs | IT Services and IT Consulting | 🇺🇸 Plano | 204 | 2007 |
| 25 | [Telaverge Communications](https://www.tamtam.ai/c/telaverge-communications) (telavergecommunications.com)<br>Global provider of communications and technology solutions with strong engineering force in Texas and India, specializing in telecom products and solutions for worldwide operators | Telecommunications | 🇺🇸 Plano | 176 |  |
| 26 | [KidKraft](https://www.tamtam.ai/c/kidkraft) (kidkraft.com)<br>KidKraft crafts award-winning toys and furniture for children worldwide, blending classic play with modern technology to foster imagination and fun | Manufacturing | 🇺🇸 Plano | 108 | 1968 |
| 27 | [TMF Plastic Solutions](https://www.tamtam.ai/c/tmf-plastic-solutions) (tmfenterprises.com)<br>Custom injection molding of plastic components and assemblies for consumer goods, durable goods, fitness, food service, communications, and OEM industries. | Plastics Manufacturing | 🇺🇸 Plano | 85 | 2000 |
| 28 | [Argent Associates, Inc.](https://www.tamtam.ai/c/argent-associates-inc) (argentassociates.com)<br>A global technology service provider offering cutting-edge solutions, R&D for edge computing, e-commerce platform, and community-focused initiatives for business growth | IT Services and IT Consulting | 🇺🇸 Plano | 24 | 1998 |
| 29 | [Highpoint Design LLC](https://www.tamtam.ai/c/highpoint-design-llc) (hptdesign.com)<br>An established electrical/electronics manufacturer offering quality design and manufacturing services, specializing in industrial applications and advanced touch-based systems | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Plano | 3 | 2003 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

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Source: https://www.tamtam.ai/l/r-and-d-companies-plano