Stream Raises $38 Million Series B Led by Felicis Ventures

Investment Occurs 6 Months Post-Series A; Accelerates Global Growth for Chat & Activity Feed APIs

BOULDER, Colo.--()--Stream, the creator of enterprise-grade activity feed and chat APIs, today announces the close of its $38 million Series B funding round, led by Felicis Ventures’ Aydin Senkut with participation from Series A lead investor GGV Capital and 01 Advisors. The Series B follows just six months after the company’s $15 million Series A round in August 2020, bringing total financing to $53 million. The accelerated financing rounds signal market uptake of Stream’s innovative technology as chat becomes the dominant medium for day-to-day communications.

Stream provides APIs which enable product teams to build chat and activity feeds for their applications at scale in a fraction of the time and cost of developing in-house. Stream powers in-app experiences for more than a billion end-users, working with customers in segments as diverse as healthcare, education, finance, virtual events, dating and social. Notable customers include TaskRabbit, NBC Sports, Unilever, Delivery Hero, Gojek, eToro and Stanford University.

The investment comes after the company experienced a 517% increase in revenue from its chat API product in 2020, while more than doubling its chat and activity feed user base to support over one billion end users. As organizations moved swiftly in the past year to expand online operations and fuel virtual communication, many turned to Stream’s chat API and SDKs to efficiently implement messaging solutions.

“The API economy creates a golden age for engineers and product teams,” said Stream Co-founder & CEO Thierry Schellenbach. “With a proven API foundation to build on, teams go from concept to launch in a fraction of the time it would take to develop comparable functionality from scratch. The boost in efficiency allows engineers to focus on core features that differentiate their product instead of reinventing the wheel."

Aydin Senkut, founder and managing partner of Felicis Ventures, recognized market potential in Stream's proven chat technology and approached Schellenbach through an introduction by a Felicis founder almost immediately after the close of the company’s Series A.

Senkut, an original super angel turned multi-stage investor, is well-known for backing Shopify, Fitbit, Rovio, PluralSight and API-focused startup Adyen.

“APIs allow project managers to move much more efficiently than in the past, and as a result, we’re seeing continued growth in the sector,” said Senkut. “Stream is at the forefront of the API wave, and we’re very pleased to have them join the Felicis portfolio.”

Additional investors in the round include Olivier Pomel, CEO of Datadog; Tom Preston-Werner, co-founder of GitHub; Amsterdam-based Knight Capital; Johnny Boufarhat, founder and CEO of Hopin; and Selcuk Atli, co-founder and CEO of Bunch. Knight, Pomel and Preston-Werner have historically invested in Stream, while Boufarhat and Atli are new investors.

“We've loved working with Thierry, Tommaso, and the entire team at Stream over the past six months and continue to be impressed by their growth and dedication to elevating in-app messaging and activity feeds for more than a billion end-users globally,” said Tiffany Luck, investor at GGV Capital and Stream board member.

“Stream’s technology addresses a common problem in product development by offering an easy-to-integrate and scalable messaging solution,” said Dick Costolo, co-founder and managing partner of 01 Advisors, and former Twitter CEO. “Beyond that, their team and clear vision set them apart, and we ardently back their mission.”

Stream supports a wide range of customers – from startup to enterprise – with a variety of plans and ease of customization to fit their individual needs. Regardless of size, product teams trust Stream to launch faster, iterate more often and ship a better user experience.

“The Stream Chat integration process was basically just one line of code,” said Jack McMillan, co-founder of Student+, a messaging app purpose-built for new students at the University of Edinburgh. “It almost felt like cheating because it was so easy to integrate.”

"It was important to us to choose a partner that could scale with the rapid growth we’ve been supporting in the virtual events space," said Elissa Ewers, director of product management at Freeman, the world’s leading provider of live events and brand experiences. "We chose Stream Chat to integrate into our leading hybrid event platform, OnlineEvent®, because we valued a secure chat solution that would be quick and easy to implement, and support functionality such as channels, groups, file sharing, threads, and more."

Stream was founded by Schellenbach and Chief Technology Officer Tommaso Barbugli in Amsterdam. The company participated in the Techstars NYC accelerator program in 2015 and subsequently moved its headquarters to Boulder, Colo. Today, Stream employs nearly 100 people in Amsterdam, Boulder and remotely.

Stream plans to invest in scaling its global team. In 2020, the team tripled in size, and the personnel growth will continue with the new funding.

To learn more about Stream, visit

About Stream

Stream is the best-in-class, enterprise-grade chat and activity feed provider that serves over a billion end users. Stream’s feature-rich products include robust client-side SDKs for iOS, Android, React, React Native, Flutter, and support for the most commonly used server-side languages; scalable and secure APIs; and a beautiful UI kit. Stream is the fastest, most scalable solution on the market today, enabling application product teams to increase user engagement and retention and decrease time to market. Stream is headquartered in Boulder, Colo. with an office in Amsterdam. Learn more about what Stream Chat can do for your business by signing up for a free, 28-day Chat Trial.

About Felicis Ventures

Founded in 2006, Felicis Ventures is a venture capital firm investing in companies reinventing core markets, as well as those creating frontier technologies. Felicis focuses on early stage investments and currently manages over $1.2B in capital across 7 funds. The firm is an early backer of more than 30 companies valued at $1B+. More than 80 of its portfolio companies have been acquired or gone public, including Adyen (IPO), Credit Karma (acq by Intuit), Cruise (acq by General Motors), Fitbit (IPO), Guardant Health (IPO), Meraki (acq by Cisco), Ring (acq by Amazon), and Shopify (IPO). The firm is based in Menlo Park, CA. Learn more at

About GGV Capital

GGV Capital is a global venture capital firm that invests in local founders building market leading companies. GGV is sector-focused, investing in social/internet, enterprise tech and smart tech from seed to growth stage from five offices around the world. GGV has $9.2 billion in assets under management across multiple funds, and its portfolio companies have completed 11 IPOs in the last 15 months. Over the past two decades, GGV has backed more than 400 companies around the world, including Affirm, Airbnb, Alibaba, Big Commerce, Boss Zhipin, Grab, HashiCorp, Hello, JD MRO, Keep, Kujiale, Manbang, NIU, Opendoor Technologies, Peloton, Poshmark, Qunar/Ctrip, Slack, Square, StockX, Udaan, Wish, Xpeng, Zendesk, Zuoyebang, and more.

Learn more at and @ggvcapital.

About 01 Advisors

01 Advisors is a unique CEO coaching advisory and venture capital firm focused on helping companies grow after they've obtained product-market fit. Founded in 2018 by former at-scale operators, Dick Costolo (Former Twitter CEO) and Adam Bain (former Twitter COO), 01 Advisors has made over two dozen multi-stage investments in Enterprise Tech, Consumer, Gaming, Education, and Smart Tech companies. Learn more at


MEDIA CONTACT: Catie Mayer, PR Specialist
+1 (720) 470-2901

Release Summary

Stream, a creator of enterprise-grade activity feed and chat APIs, announces the close of its $38 million Series B funding round.


MEDIA CONTACT: Catie Mayer, PR Specialist
+1 (720) 470-2901