ElevenLabs, an artificial intelligence audio startup capable of creating a wide range of realistic-sounding voices, is letting employees sell shares at a valuation of $6.6 billion — double its previous value. The tender offer, which will allow staff to sell as much as $100 million in stock, is an increasingly popular tactic for AI startups engaged in a fierce competition for talent. The offer will let employees who have worked at the company for at least a year to cash in on valuable shares, and...