Anthropic has been working on a plan to let existing shareholders sell some stock in its blockbuster initial public offering while also considering longer-than-usual lockup periods for sales after it’s public, people familiar with the process said.

Allowing secondary stock sales in the IPO would distinguish Anthropic from this year’s other big tech listings, SpaceX and Cerebras, which didn’t have existing stockholders sell shares in the IPO itself. Some other big tech IPOs in recent years, including CoreWeave and Figma, have included existing stockholder sales when the companies issue new shares in the IPO.