OpenAI chief revenue officer Denise Dresser has said she will leave the company in the coming weeks, becoming the second senior executive to announce a departure this week. Her exit adds to a run of leadership changes as OpenAI prepares for its next stage of commercial growth and a possible public listing.

Dresser joined OpenAI in December after previously leading Slack, and some of her responsibilities had earlier been handled by former COO Brad Lightcap, who also announced his departure this week. OpenAI said Dali Rajic, Wiz’s president and COO, will replace her; other recent departures include former AGI chief Fidji Simo and former CMO Kate Rouch. The company confidentially filed an S-1 registration statement for an IPO in June.