Top Series B companies

Companies that have closed a Series B - proven scaling motion, hiring aggressively.

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Ranked by current headcount across Series B companies. Refreshed monthly.

1
Instagram
More than one billion people around the world use Instagram, and we’re proud to be bringing them closer to the people and things they love. Instagram inspires people to see the world differently, discover new interests, and express themselves.Since launching in 2010, our community has grown at a rapid pace. Our teams are growing fast, too, and we’re looking for talent across engineering, product management, design, research, analytics, technical program management, operations, and more. In addition to our headquarters in Menlo Park, we have thriving offices in New York City and San Francisco where teams are doing impactful work every day.
- Series B
- 61k employees
- Founded 2010
2
Aster DM Healthcare· United Arab Emirates
From a single medical centre to a performance-driven healthcare enterprise spread across more than 400+ medical establishments, including 15 hospitals, 120 clinics and 307 pharmacies in GCC and growing, Aster DM Healthcare has transitioned into being the leading healthcare authority across the Middle East.Currently one of the largest and fastest growing conglomerates in the MENA region, Aster DM Healthcare covers the full spectrum of healthcare services. An expansive portfolio includes hospitals and clinics, pharmacies, diagnostic centres, educational institutions, healthcare management and healthcare support systems.Headquartered in Dubai, the Aster DM network now encompasses more than 19,657 employees( Doctors, Nurses, Others) with JCI accredited clinics and diagnostic centres.Never content to rest on its laurels, Aster DM Healthcare is constantly seeking opportunities to set new yardsticks with advanced developments. With many more innovative and ambitious initiatives, Aster DM Healthcare has radically catalyzed the healthcare revolution across Middle EastEach of the Group’s verticals is a symbol of distinction, driven by the commitment to build a healthier tomorrow and to take healthcare to the next level of excellence.
- Series B
- 20.5k employees
- Founded 2023
3
Railway· San Francisco, California, United States
Railway’s mission is to build the cloud computing stack that unburdens you, so you can focus more on what matters to you.
- Series B
- 11.4k employees
- Founded 2020
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4
Evolution· Birkirkara, Malta
Evolution is a world-leading innovator in product development and advanced IT solutions for online casinos.We are a multinational B2B product and service provider with an extensive track record of number 1s and are always looking for great people to help us create the next big product hit. Founded in 2006, we’ve grown to a diverse group of 22,000 people guided by our values: ALIVE, do RIGHT, and work TOGETHER.Our teams create our product concepts, develop the software, integrate the product with the operators’ interface, and deliver both the technical solutions and the staff required for the operators to offer online slots and live casino 24/7/365 on mobile, tablet, or desktop. We also build our studios and interiors.Evolution AB (publ) is listed on Nasdaq Stockholm.Please read our Privacy and Cookies policies below before submitting any personal data to us: https://www.evolution.com/privacy-policy & https://www.evolution.com/cookies-policyFollowers must be 18+. https://www.begambleaware.org/ Please gamble responsibly. 🔞 Evolution is licensed and regulated by the Malta Gaming Authority under licence MGA/CRP/187/2010. Evolution is also licensed and regulated in many other jurisdictions such as the United Kingdom, Belgium, Canada, Romania, South Africa, and others.
- Series B
- 9.5k employees
- Founded 2006
5
Chief· New York, New York, United States
Chief is a community of ambitious women executives shaping the new era of leadership.Chief exists to create more possibilities for women’s power.Today’s leaders face seismic shifts unlike any generation before them. But they don’t have to do it alone. Networking is not just a necessity, it’s a door to unique possibilities. Our members catalyze their ambition with the tools, the network, and the space to do business, create change, and lead on. We believe that women are as ambitious as ever.We believe that leadership today is non-linear.We believe that connections between powerful women unlock possibilities. We believe that multihyphenate women are rewriting the rules of leadership for the next generation. Our strength lies in our diversity. Each new perspective grows our collective power.Chief is the only membership network that combines access to exclusive Clubhouses, world-renowned Guides and Executive Coaches, top-level training from the Wharton School of Business, annual summits, and events at the industry conferences that matter.Apply today: chief.com/apply
- Series B
- 7.6k employees
- Founded 2019

6
Datavant· New York, New York, United States
Datavant is the data collaboration platform trusted for healthcare. With a mission to make the world’s health data secure, accessible, and actionable, Datavant works with payers, providers, life sciences, legal and insurance clients globally to accelerate insights. Datavant enables more than 60 million healthcare records to move between thousands of organizations across the healthcare ecosystem, more than 80,000 hospitals and clinics, 75% of the 100 largest health systems, and 350+ real-world data partners. Datavant has office locations in Boston, New York and San Diego, with international offices in Barcelona and Galway. To learn more about Datavant, visit datavant.com and follow us on LinkedIn.
- Series B
- 7.4k employees
- Founded 2014
7
Outlier AI· Oakland, California, United States
Outlier shut down in 2022, this page remains as a memory of our company and on the resumes of our team.Business intelligence is ready for a change. We don't believe the world needs any more dashboards, charts or data warehouses. What leaders need today is help to make better use of the tools they already have. That is what we do at Outlier: we improve the relationship between people and their data.We believe that success in life and success in business are not separate things, but intertwined as part of our lives. It is important to us that the journey we take with our company is as positive as the destination we hope to reach.
- Series B
- 7.3k employees
- Founded 2015
8
GitHub· San Francisco, California, United States
As the global home for all developers, GitHub is the complete AI-powered developer platform to build, scale, and deliver secure software. Over 100 million people, including developers from 90 of the Fortune 100 companies, use GitHub to build amazing things together across 330+ million repositories. With all the collaborative features of GitHub, it has never been easier for individuals and teams to write faster, better code.
- Series B
- 6.8k employees
- Founded 2008
9
Shipt· Birmingham, Alabama, United States
Through a community of shoppers and a convenient app, Shipt provides personal shopping and delivery and is available to 80% of households in more than 5,000 U.S. cities. Shoppers go above and beyond, communicating in real time about preferences and substitutions. A curated marketplace of retailers, Shipt offers access to a variety of stores and product categories including fresh foods, household essentials, wellness products, office and pet supplies. Shipt is an independently operated, wholly owned subsidiary of Target Corp. Founded and headquartered in Birmingham, Alabama, Shipt also maintains an office in San Francisco. For more information, visit Shipt.com.
- Series B
- 6.5k employees
- Founded 2014
10
Driver· San Francisco, California, United States
Based in San Francisco and Shanghai, Driver is a technology platform that connects cancer patients to treatments and knowledge, all over the world, to get more life. With an app for the patient and an app for the doctor, Driver’s platform enables any cancer patient, regardless of their location, to access treatment options across Driver’s global network of cancer centers without leaving home. Driver’s network includes over 30 of the world’s leading cancer centers, including its founding members the US National Cancer Institute and the Chinese National Cancer Center. Other members of Driver’s network include the Cleveland Clinic, Mayo Clinic, Massachusetts General Hospital, University of California San Francisco, University of California Los Angeles, Duke, University of North Carolina, and Emory. Driver was founded in 2015 by two physicians, Dr. William R. Polkinghorn and Dr. Petros Giannikopoulos, and Driver’s lead investor is Horizons Ventures (Li Ka Shing).
- Series B
- 6.5k employees
- Founded 2015

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Find engineers at top Series B companies

Series B companies are some of the most active hirers in the market. The list above ranks the largest Series B-stage companies by current headcount, drawn from public LinkedIn and Crunchbase records. Across 7,430 matching companies, you’ll find senior engineers, founding designers, product leads, and operators worth tracking.

Companies at this stage tend to share a profile: clear product-market fit, fresh capital, and aggressive hiring plans. That makes the people already there valuable signals - early hires usually become the next hiring managers, founders, and angel investors.

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How this list is built

Refolk pulled the largest companies whose latest disclosed funding round is Series B from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 10 employees. The list refreshes monthly.

Last refreshed: Sun, 13 Sep 2026 19:03:06 GMT

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The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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