The companies listed are primarily large corporations, with a strong presence in software development and retail. Amazon, a major e-commerce and cloud services provider, is headquartered here. Microsoft develops software and cloud services, while T-Mobile is a significant wireless provider. Costco Wholesale operates as a global warehouse club retailer. Banfield Pet Hospital offers veterinary care, and Prime Video & Amazon MGM Studios focuses on digital video content and original productions. Most of these companies are based in Seattle, Bellevue, and Redmond.
The data shows a concentration of large enterprises in the technology and retail sectors. Many of these companies, such as Amazon, Microsoft, and Costco Wholesale, have a substantial global footprint, indicating a hub for major corporate operations within Washington State.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Amazonamazon.com
An e-commerce giant offering a vast selection of products, convenient shopping experiences, and fast delivery, connecting buyers with a wide range of sellers |
1,541,000 | |||
| 2 |
Costco Wholesalecostco.com
Global warehouse club retailer operating in multiple countries, focusing on quality, ethics, employee success, and customer service excellence. |
304,000 | |||
| 3 |
Microsoftmicrosoft.com
Develops and sells software, hardware, and cloud services, including the Windows operating system and Office suite, to improve productivity and digital experiences |
233,562 | |||
| 4 |
T-Mobilecareers.t-mobile.com
Leading US wireless provider delivering advanced 4G LTE and nationwide 5G networks, prioritizing customer value, service excellence, and innovation in Bellevue, Washington |
96,232 | |||
| 5 |
Amazon Businessbusiness.amazon.com
Simplified procurement platform offering extensive product selection and innovative tools to meet diverse organizational purchasing needs at any growth stage. |
15,896 | |||
| 6 |
Banfield Pet Hospitalbanfield.com
Providing high-quality preventive veterinary care and wellness plans to millions of pets across multiple locations in the United States and beyond. |
11,294 | |||
| 7 |
Prime Video & Amazon MGM Studiosamazonstudios.co.uk
The company focuses on delivering top-tier digital video customer experiences, creating original films and series for a global audience |
7,510 | |||
| 8 |
Veeam Softwareveeam.com
Provides data backup, recovery, security, and intelligence solutions ensuring business continuity and data availability across hybrid cloud environments worldwide. |
7,308 | |||
| 9 |
SAP Concurconcur.com
Offers integrated solutions for travel, expense, and invoice management, automating everyday processes and providing insights into spending, compliance, and budget blind spots. |
6,588 | |||
| 10 | 6,192 | ||||
| 11 |
Getty Imagesgettyimages.com
Global provider of diverse visual content, including photos and videos, serving customers worldwide through multiple brands and advanced AI tools. |
6,122 | |||
| 12 |
ZoomInfozoominfo.com
Provides go-to-market platform, accurate data, insights, and technology for businesses to find, acquire, and grow customers efficiently, aligning sales and marketing. |
4,211 | |||
| 13 |
Smartsheetsmartsheet.com
Enterprise work management platform enabling organizations to move faster, drive innovation, and achieve more through process automation and collaboration tools |
4,015 | |||
| 14 |
Icertisicertis.com
It provides AI-powered contract management solutions, helping businesses gain insights, automate processes, control costs, and ensure compliance globally. |
2,414 | |||
| 15 |
UserTestingusertesting.com
Platform providing fast, scalable human insights through tests, interviews, and surveys to optimize products and customer experiences. |
1,862 | |||
| 16 |
Tableautableau.com
Provides software tools enabling users to visualize, analyze, and interpret data for better decision-making and actionable insights. |
1,788 | |||
| 17 |
Outreachoutreach.ai
It provides a comprehensive sales execution platform that enhances efficiency in prospecting, deal management, and forecasting for revenue teams. |
1,579 | |||
| 18 |
PitchBookpitchbook.com
PitchBook provides comprehensive data, research, and insights for the global capital markets through their innovative suite of products and databases |
1,550 | |||
| 19 |
RevOps Co-oprevopscoop.com
A community for revenue operations professionals offering expertise, content, education, and networking events to support members in the field |
1,333 | |||
| 20 |
YMCA of Greater Seattleseattleymca.org
A nonprofit organization in Seattle that promotes community health, youth development, and social responsibility through various programs and facilities in the area |
1,314 | |||
| 21 |
Apptio, an IBM Companyapptio.com
Provides AI-powered software for technology spend and value management, helping leaders make financial decisions through TBM and FinOps insights for global customers. |
1,292 | |||
| 22 |
Costco ITcostco.com
A leading retailer prioritizing employee well-being and advancement, fostering a supportive and inclusive work environment with a strong focus on diversity and inclusion |
1,251 | |||
| 23 |
Absolute Securityabsolute.com
Provides cyber resilience platform ensuring secure connections for mobile/hybrid workforces and rapid recovery from cyber disruptions through embedded firmware security. |
1,249 | |||
| 24 | 1,249 | ||||
| 25 |
WatchGuard Technologieswatchguard.com
Provides unified cybersecurity solutions for managed service providers, offering network security, endpoint protection, multi-factor authentication, and secure Wi-Fi services. |
1,218 | |||
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. | |||||
| 26 |
Zenotizenoti.com
Cloud-based software for spa, salon, and med spa industries worldwide, offering solutions for appointment booking, POS, CRM, inventory, marketing, and more |
1,209 | |||
| 27 |
Nintexnintex.com
It provides intelligent automation solutions to organizations, helping them streamline processes, enhance efficiency, and empower teams across various sectors. |
1,185 | |||
| 28 |
Ziply Fiberziplyfiber.com
The company focuses on providing fast and reliable internet access to underserved areas through a locally owned and operated fiber network |
1,175 | |||
| 29 |
Trupaniontrupanion.com
Provider of comprehensive pet medical insurance with superior coverage, fast claims, and a pet-friendly, supportive work environment. |
1,048 | |||
| 30 |
Highspothighspot.com
It provides a platform for sales teams to enhance performance through content, training, coaching, and analytics for better customer engagement. |
1,039 | |||
| 31 | 1,037 | ||||
| 32 |
Educativeeducative.io
Educative offers interactive courses for developers, providing personalized learning environments and a platform for instructors to create engaging content Subscribe to their newsletter for updates |
875 | |||
| 33 |
The Seattle Timesseattletimes.com
A trusted source for independent journalism connecting communities with news on home, sports, travel, entertainment, health, and wellness in print and online |
838 | |||
| 34 |
Acumaticaacumatica.com
A global cloud ERP innovator providing adaptable technology with all-inclusive user licensing Offers integrated business applications for mid-sized companies |
785 | |||
| 35 |
PRO Clubproclub.com
Wellness resort offering a wide range of services including exercise facilities, salon, spa, and dining, all delivered with exceptional customer service by dedicated staff |
777 | |||
| 36 |
ExtraHopextrahop.com
Turns network data into actionable insights, providing visibility and analyzing behavior to intercept evasive risks for security, performance, and resilience. |
762 | |||
| 37 |
Payscalepayscale.com
The industry leader in compensation data and technology, providing organizations with multiple streams of fresh salary data and modeling engines for efficient compensation management |
736 | |||
| 38 |
Microsoft Intunemicrosoft.com
Endpoint management and security solutions for hybrid workforces with a focus on simplifying processes, enhancing user experiences, and strengthening Zero Trust architecture |
719 | |||
| 39 |
Chainguardchainguard.dev
The company specializes in providing a secure platform for open source software, with a focus on security and cloud native development |
708 | |||
| 40 |
SPIE, the international society for optics and photonicsoauth.spie.org
Bringing together professionals in optics and photonics for global advancement through conferences, publications, and professional development, with a focus on enhancing life worldwide with photonics |
690 | |||
| 41 | 659 | ||||
| 42 |
Amazon.com, Inc.amazon.com
A Seattle-based company founded by Jeff Bezos, known for e-commerce, cloud computing through AWS, generative AI with Bedrock platform, and Prime Video streaming service |
657 | |||
| 43 |
Temporal Technologiestemporal.io
Develops and distributes an open source durable execution system that makes code fault tolerant, reliable, and easy to maintain. |
542 | |||
| 44 |
Cloud Security Alliancecloudsecurityalliance.org
A non-profit organization promoting best practices for cloud security, providing education on cloud computing security, and promoting industry collaboration |
536 | |||
| 45 |
AAA Washingtonaaa.com
A trusted provider of emergency road service, leisure travel, personal insurance, discounts, and financial services, dedicated to safety and inclusivity |
535 | |||
| 46 |
Pushpaypushpay.com
Company strengthens community, connection, and belonging. It is a SaaS company changing how organizations connect with customers and stakeholders through mobile technology. |
493 | |||
| 47 |
Concord Technologiesconcord.net
Leading modern Cloud Fax platform with AI technology for data extraction, document workflows, and secure fax management High eNPS |
466 | |||
| 48 | 460 | ||||
| 49 |
Wave Broadbandastound.com
provides high-speed fiber internet, phone, and cable services to residential and business customers across Washington, Oregon, and California |
435 | |||
| 50 |
Zonar Systemszonar.com
A leader in smart fleet management technologies for transportation fleets, prioritizing safety, employee well-being, diversity, and professional growth |
433 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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.
More company lists in Washington State
- The largest companies in Washington State 2,143
- Multinational companies in Washington State 288
- Manufacturers in Washington State 176
- Education providers in Washington State 169
- Professional services firms in Washington State 163
- Retail chains in Washington State 161
- IT Services and IT Consulting companies in Washington State 160
- SaaS companies in Washington State 155
- Critical infrastructure operators in Washington State 149
- IT services companies in Washington State 145
- Companies with in-house R&D in Washington State 140
- Software Development companies in Washington State 140
- Public sector organisations in Washington State 139
- Healthcare providers in Washington State 136
- Companies with a mobile app in Washington State 128
- Hardware manufacturers in Washington State 121
- AI companies in Washington State 110
- Hospitals and Health Care companies in Washington State 107
- Consulting firms in Washington State 106
- Financial services firms in Washington State 92
- Construction companies in Washington State 87
- Higher Education companies in Washington State 74
- Family-owned companies in Washington State 73
- E-commerce companies in Washington State 69
The same list elsewhere in United States
- Subscription businesses in the United States 3,923
- Subscription businesses in California 940
- Subscription businesses in New York State 485
- Subscription businesses in Texas 310
- Subscription businesses in Florida 202
- Subscription businesses in Massachusetts 183
- Subscription businesses in Illinois 160
- Subscription businesses in Virginia 114
- Subscription businesses in Colorado 108
- Subscription businesses in Alabama 104
- Subscription businesses in Georgia 103
- Subscription businesses in Pennsylvania 90
- Subscription businesses in Utah 89
- Subscription businesses in New Jersey 85
- Subscription businesses in Arizona 74
- Subscription businesses in North Carolina 62
- Subscription businesses in New York 422
- Subscription businesses in San Francisco 323
- Subscription businesses in Austin 112
- Subscription businesses in Chicago 92
- Subscription businesses in Boston 87
- Subscription businesses in Atlanta 66
- Subscription businesses in Washington 63
- Subscription businesses in Los Angeles 60