The artificial intelligence sector witnessed notable deal activity this week, highlighted by two major transactions involving prominent AI companies.

Cognition, an AI coding firm, is currently in discussions for a funding round that would value the company at $25 billion, according to people familiar with the matter. The substantial valuation reflects growing investor interest in AI companies developing automated software development tools.

Separately, Sierra, the AI customer service agent startup founded by former Salesforce co-CEO Bret Taylor, announced it has acquired Fragment, a French AI startup that previously received backing from Y Combinator. Sierra has positioned itself as a provider of AI-powered customer service solutions for enterprises.

The transactions occur amid broader activity in technology markets, with investor Bill Baruch taking a position in chip designer Arm Holdings, citing the company's pivot toward AI semiconductors and a recent partnership with Meta as key factors driving his investment decision.

Meanwhile, Chinese technology stocks showed divergent performance, with the ChiNext index outperforming Hong Kong-listed technology shares, highlighting regional variations in tech sector valuations.

The deals underscore continued investor appetite for AI companies across different segments, from coding assistance to customer service automation, as the sector continues to attract significant capital investment.