Elon Musk’s Neuralink raised $600 million in a deal that values the brain-mapping company at $9 billion before the new cash, people familiar with the matter said.The startup was last valued at $3.5 billion in late 2023, according to Pitchbook, but has since implanted three chips into the brains of patients paralyzed or unable to speak. The most recent, a non-verbal Arizona man with ALS, posted a video on Musk’s X last month in which he speaks using the chip.Bloomberg reported in April that Neura...