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Photo illustration: Rebecca Zisser / Axios

Sam Altman is stepping down as president of influential startup incubator Y Combinator, in order to spend more time on outside interests like the OpenAI research organization. He'll transition into a chairman role, with many of his day-to-day responsibilities assumed by YC's partners.

Why it matters: YC is known for breeding unicorns, having incubated such startups as Airbnb, Dropbox, Stripe and Twitch.

Altman was YC's second-ever president, hand-picked in 2014 by predecessor Paul Graham, and has significantly expanded the program's scale. He tells Axios that he only sees the program continuing to grow:

"As capital and advice get more commoditized, network becomes the durable advantage."
— Altman

YC today also will confirm reports that it plans to move both its headquarters and its Demo Days from Mountain View into San Francisco. The new Demo Day also will be split into 2 tracks, due to the larger number of companies.

Go deeper

17 mins ago - Politics & Policy

Senate offices closing on Friday ahead of pro-Capitol riot rally

Security fencing outside the U.S. Capitol ahead of a planned "Justice for J6" rally in Washington, D.C.. Photo: Stefani Reynolds/Bloomberg via Getty Images

Multiple Senate offices are planning to close Friday amid security concerns around Saturday's rally in support of jailed Jan. 6 rioters, a series of senate aides who were told to work remotely on Friday tell Axios.

Why it matters: The Capitol this weekend will face its first large-scale security test since the deadly Jan. 6 attack. In the meantime, House and Senate offices are taking precautionary measures to ensure their staff remains safe.

State Department partners with aid group welcoming Afghan refugees to U.S.

Secretary of State Antony Blinken speaking in Washington, D.C., on Sept. 14. Photo: Mandel Ngan/POOL/AFP via Getty Images

Secretary of State Antony Blinken announced Thursday that the State Department is partnering with Welcome.US, an aid group helping to welcome and support Afghan refugees who fled their country for the U.S.

Why it matters: The partnership is part of the Biden administration's Operation Allies Welcome, which involves the processing and resettlement of the more than 65,000 Afghans evacuated during the U.S. military withdrawal from Afghanistan.

Workout economy hangs fate on celeb trainers

Illustration: Annelise Capossela/Axios

At-home workout companies are turning fitness instructors into stars.

What's new: Tonal, which makes a wall-mounted, strength training device, said its machines will start streaming live classes in October.