Decagon, an AI-powered customer support startup, is set to announce the completion of its first tender offer, allowing its more than 300 employees to sell a portion of their vested shares at the company’s latest valuation of $4.5 billion. The less-than-three-year-old company’s employee secondary is being led by the same investors that backed its $250 million Series D less than two months ago, including Coatue, Index, a16z, Definition, Forerunner, and Ribbit. As competition for AI talent is intensifying, fast-growing, young startups are increasingly finding that one of the most effective ways to attract and retain high-caliber employees is to allow them to convert some of their equity into cash through these types of transactions. Other AI startups that have recently held employee tender offers include ElevenLabs, Linear, and Clay, which conducted two in a nine-month period.…