Bluesky's 2025 $100M Series B Lays Foundation for Open Social Web

In April 2025, Bluesky raised $100 million in Series B funding led by Bain Capital Crypto, with participation from Alumni Ventures, Anthos Capital, Bloomberg Beta, Knight Foundation and True Ventures. In the months since, we've focused on scaling our team to meet the rapid growth of both the AT Protocol (atproto) and Bluesky app. We're excited to share more as we move into a new era of leadership and further growth.

This raise was led by Bluesky founder Jay Graber, who recently transitioned to Chief Innovation Officer to focus on building the future of open social infrastructure.

Since announcing our Series A in October 2024, we've grown from 13 million to over 43 million global users. The Atmosphere—the ecosystem of builders, apps and users on atproto—has expanded alongside us.

Every week, people use over a thousand apps built on atproto. Every month, we see over 400,000 SDK downloads. The Atmosphere currently contains about 20 billion public records—the posts, likes, comments and other interactions that bring the ecosystem to life. It's an astonishing collection of what open social infrastructure makes possible.

This new funding gives us the foundation upon which to build the future of the open social web without compromising our mission and values.

None of this would be possible without our broader community. Thank you to the developers, creators, and everyday users who have made the Atmosphere and Bluesky what it is today. Let's keep building together.