This selection of large and mid-sized companies in Plano, Texas, focuses on technology and IT services, with a significant presence in software development, cybersecurity, and healthcare technology. Notable companies include NTT DATA North America, which provides business and technology consulting and AI solutions, and Siemens Digital Industries Software, specializing in digital transformation for design and manufacturing.
Also present are CorroHealth, a provider of healthcare analytics, and Trellix, which offers intelligence-led cyber resilience. A common thread among these companies is their focus on leveraging data and AI for business optimization, digital transformation, and specialized solutions across various industries.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
NTT DATA North Americaus.nttdata.com
provides business and technology consulting, data and AI solutions, application development, infrastructure management, and industry-specific services globally |
24,414 | |||
| 2 |
Siemens Digital Industries Softwaresiemens.com
The company helps organizations digitally transform using Siemens Xcelerator platform, optimizing design, engineering, and manufacturing processes to create sustainable products |
20,925 | |||
| 3 |
CorroHealthcorrohealth.com
Provides clinically led healthcare analytics and technology solutions to improve financial performance for physicians, hospitals, and health plans, leveraging integrated solutions and intelligent technology. |
11,592 | |||
| 4 |
iSoftStoneisoftstoneinc.com
Global IT service and consulting company specializing in web development, software testing, data management, digital experience, and AI solutions. |
7,385 | |||
| 5 |
Siemens PLM Software (inactive)sw.siemens.com
Drives enterprise transformation, enabling digital engineering, manufacturing, electronics design. Solutions create digital twins providing insights, automation for innovation for companies. |
4,233 | |||
| 6 |
Ribbon Communicationsribboncommunications.com
Provides communications software, IP and optical networking solutions for service providers, enterprises, and critical infrastructure with modern, scalable, and secure technologies. |
4,092 | |||
| 7 |
Trellixtrellix.com
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. |
3,827 | |||
| 8 |
FinThrivefinthrive.com
The company develops revenue management technology for healthcare, providing integrated solutions to streamline financial processes and improve patient experiences and outcomes |
2,728 | |||
| 9 |
ECI Telecomrbbn.com
Global communications software and network solutions provider for service providers, enterprises, and critical infrastructure sectors, offering innovative end-to-end solutions for modernizing networks |
1,513 | |||
| 10 |
Arbisoftarbisoft.com
Custom software development and engineering services for global market leaders, providing digital transformation and state-of-the-art products across diverse industries using 900 professionals. |
1,077 | |||
| 11 |
Ideas2IT Technologiesbit.ly
Specializing in solving complex tech problems for enterprises, we excel in launching and executing future-forward technology initiatives with proven success globally |
807 | |||
| 12 |
ZeOmegazeomega.com
ZeOmega provides leading technology for simplifying population health management, offering superior workflow, integration capabilities, clinical content, and personalized deployment models |
717 | |||
| 13 |
Polestar Analyticspolestaranalytics.com
Specializing in analytics and AI, this organization helps businesses leverage data for valuable insights through a wide range of services |
693 | |||
| 14 |
Payoda Technology Incpayoda.com
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 |
663 | |||
| 15 |
Securonixsecuronix.com
Transforms security operations delivery, measurement, and scalability with a cloud-native platform unifying SIEM, UEBA, SOAR, TIP, and TDIR for faster threat detection, investigation, and response. |
654 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Trintechtrintech.com
Trintech provides cloud-based reconciliation and financial close solutions for organizations looking to streamline F&A processes and improve efficiency |
651 | |||
| 17 |
Silverfortsilverfort.com
Provides an end-to-end identity security platform, protecting all identities, human and machine, across on-premise and cloud environments, minimizing attack surfaces. |
634 | |||
| 18 |
AppLogic Networksapplogicnetworks.com
Analyzes application and network data to optimize performance and monetize user experiences, enhancing overall application efficiency and value. |
631 | |||
| 19 | 610 | ||||
| 20 |
Zuci Systemszucisystems.com
Digital engineering company specializing in AI, data analytics, quality engineering, and automation to modernize platforms and scale intelligent enterprises globally. |
603 | |||
| 21 |
CG Infinitycginfinity.com
Technology implementation and software solutions provider focused on Salesforce integration and custom development for Energy, Utilities, and Financial Services through small blended teams. |
529 | |||
| 22 |
Research Now SSIdynata.com
Global leader in digital research data providing solutions for over 5,800 clients across various industries for better insights and business decisions worldwide |
477 | |||
| 23 | 
TECH MAHINDRA AMERICAS
An IT and services company located in Texas, specializing in providing information technology solutions and support to clients in the Americas |
474 | |||
| 24 |
Chargeback Guruschargebackgurus.com
This company provides chargeback management solutions, AI analytics, and insights to help businesses protect revenue and maximize recovery rates |
454 | |||
| 25 |
Softweb Solutions Inc. - An Avnet Companysoftwebsolutions.com
AI software development, IoT applications, data services, digital transformation, cognitive bots, extended reality, custom apps, enterprise mobility, marketing automation. |
420 | |||
| 26 |
Winfo Solutionswinfosolutions.com
Provides digital transformation, ERP, automation, data analytics, and custom development services globally, acting as an Oracle partner for system implementation and support. |
396 | |||
| 27 |
Optimal Bluewww2.optimalblue.com
A digital marketplace connecting lenders, investors, and vendors in the mortgage industry, offering comprehensive secondary marketing solutions and value-added services |
348 | |||
| 28 |
iSteeristeer.com
Specializes in enterprise automation, integration consulting, development, and support using advanced technologies for global mid to large-scale projects. |
342 | |||
| 29 |
Ray Business Technologies (A CMMI Level 3 Company)raybiztech.com
Ray Business Technologies provides innovative IT services and solutions, specializing in AI, ERP, CRM, Kentico, Dynamics 365, Sitecore, Boomi, and BI services globally |
317 | |||
| 30 |
Logile, Inc.logile.com
Leader in retail workforce and inventory management, utilizing AI, machine-learning, and industrial engineering to drive operational excellence, boost profitability, and deliver optimal service and products |
302 | |||
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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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