59 Series B startups in United States

59 Series B startups in United States with 113 founders and decision-makers, led by San Francisco. 45 verified founder emails. Updated 2026-10-03.

Key findings

• FindMeMail tracks 59 Series B startups in United States, with 113 founders and decision-makers listed.
• San Francisco is the top city, with 7 of them (12%), followed by Atlanta (3).
• The most common team size is 1-10 employees (56% of companies).
• 1 (2%) were founded in the last three years.
• 25 companies (42%) have at least one verified founder email, 45 verified emails in total.

Breakdown

Top cities

• San Francisco: 7 (12%)
• Atlanta: 3 (5%)
• New York: 3 (5%)
• Albuquerque: 2 (3%)
• Seattle: 2 (3%)
• Los Angeles: 2 (3%)
• San Mateo: 2 (3%)
• Portland: 2 (3%)

Team size (employees)

• 1-10: 33 (56%)
• 11-50: 19 (32%)
• 51-100: 5 (8%)
• 101-250: 1 (2%)
• 1001-5000: 1 (2%)

Founded (last 10 years)

• 2017: 6 (10%)
• 2018: 3 (5%)
• 2019: 2 (3%)
• 2020: 1 (2%)
• 2021: 3 (5%)
• 2025: 1 (2%)

Recently added Series B startups in United States

• Extreme Networks — Morrisville, United States: Extreme Networks provides wired and wireless networking solutions to enhance connectivity for businesses and organizations.
• PlayFab — Seattle, United States: PlayFab is a cloud-based provider of tools and services for building and managing online games.
• NFHS Network — Atlanta, United States: NFHS is a joint venture with the National Federation of State High School Associations (NFHS) and its member state high school associations.
• Phynd Technologies — Dallas, United States: Phynd Technologies is a provider of data management and provider search solutions.
• Petnet — Los Angeles, United States: Petnet is a connected pet device company that offers a pet analytics platform to find solutions for fundamental problems of petcare.
• Pathrise — San Francisco, United States: Pathrise is an online mentorship program for tech professionals that provides training, and advice to help in landing the next job.
• Violet Defense — Orlando, United States: Violet Defense Group is dedicated to protecting the world from germs by bringing clinical-level UV disinfection to everyday spaces.
• Circonus — Malvern, United States: Circonus provides a unified platform for monitoring and analyzing all of your metrics, infrastructure, applications.
• Revagenix — San Mateo, United States: Revagenix is a biopharmaceutical company discovering and developing therapies to address medical needs.
• IGNITE IMPULSE, INC. — Dunedin, United States: PRECISION FARMING AND CROP MANAGEMENT SOLUTIONS SUPPORTED BY ARTIFICIAL INTELLIGENCE.
• Stockwell — Oakland, United States: Stockwell is combining the convenience of online ordering with the instant gratification of real world retail.
• Tellus — Deerfield Beach, United States: Tellus provides comprehensive solutions to extend healthcare beyond the hospital walls.
• Energy Materials Corporation — Rochester, United States: Energy Materials Corporation develops high-speed, roll-to-roll printing of purebred perovskite solar panels.
• Aerami Therapeutics — Durham, United States: Aerami Therapeutics focuses on developing novel inhaled therapies for the treatment of chronic diseases.
• Ribbon Finance — San Francisco, United States: Ribbon Finance creates structured products that deliver sustainable yield using financial engineering for DeFi.
• Streamlit — San Francisco, United States: Streamlit is an open-source app framework for creating and deploying data science applications.
• Migo — San Francisco, United States: Migo is an embedded lending software that specializes in microfinance, credit, and loan services.
• Murphy's Naturals — Raleigh, United States: Murphy's Naturals is a celebrate nature and inspire good through natural products.
• OROS Labs — Portland, United States: OROS Labs is a material technology company provides thermal solutions.
• Blispay — Baltimore, United States: Blispay is a financial technology company pioneering the next generation of point-of-sale financing.
• Mixhalo — San Francisco, United States: Mixhalo is a real-time audio platform that delivers an immersive experience for live events.
• S4 Medical — Broadview Heights, United States: S4 Medical is a medical device company that focuses on innovative solutions for cardiac procedures.
• Impira — San Francisco, United States: Impira is automating routine tasks, empowering people to spend more time doing meaningful work.
• PowerToFly — New York, United States: PowerToFly AI is an AI workforce partner, connecting organizations with representative experts who build, train, and ship AI.
• Convictional — Dover, United States: Convictional is reinventing business operations.
• PAYDOTA — Albuquerque, United States: The company specializes in financial technology (FinTech) solutions, focusing on virtual and prepaid card issuing, electronic payments,
• Gemmus Pharma — San Francisco, United States: Gemmus Pharma serves the biotechnology, health care, and pharmaceutical industries providing innovative solutions.
• DealBase Corporation — Manhattan Beach, United States: Hotel booking platform offering exclusive deals for travelers and guests.
• GameSkinny — Atlanta, United States: GameSkinny is a video game website that enables players and gaming enthusiasts to publish and discover articles, videos and reviews.
• Crystal Knows — Nashville, United States: Crystal helps you communicate with anyone based on their unique personality.

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Frequently asked questions

How many Series B startups in United States are there?

FindMeMail currently lists 59 Series B startups in United States with at least one founder or decision-maker identified. The count updates daily as new companies are added.

Where are most Series B startups in United States based?

San Francisco (7), Atlanta (3), New York (3).

How do I contact founders of Series B startups in United States?

45 verified founder emails are available for these companies on FindMeMail. Create a free account to get 50 free reveals, then buy one-time credit packs from $12.

Related reports

• Software companies in United States (3,675)
• Artificial Intelligence (AI) companies in United States (2,382)
• Seed-stage startups in United States (1,905)
• Information Technology companies in United States (1,861)
• Health Care companies in United States (1,647)
• E-Commerce companies in United States (1,545)
• SaaS companies in United States (1,304)
• Pre-seed startups in United States (1,096)
• Financial Services companies in United States (1,062)
• Manufacturing companies in United States (959)
• Consulting companies in United States (949)
• Internet companies in United States (824)

Methodology: counts include companies in the FindMeMail database with at least one identified founder or decision-maker. Data refreshes automatically as new companies are added.