CBRS Perp Eases to $360 as Day-One Basis Finally Compresses

Off the $387 High

The xyz:CBRS perp is changing hands at $360.90 after a 27.61% leg over five hours, well off the $387 high it printed in the prior hour. The fade started once Cerebras Systems opened on Nasdaq at $350 per share — almost double the IPO mark — and cash briefly traded above $370 before settling into a $350–$380 range. For the first time today, the perp is trading roughly where the cash tape is, after spending the morning running about 70% above the $220.90 Hiive secondary mark that closed Wednesday.

Cash Finally Catches the Bid

Underwriters priced the IPO at $185 per share last night, $25 above the marketed $150–$160 range and well above the $115–$125 the company first filed earlier this month. The book was more than 20x oversubscribed and raised $5.55 billion, the largest Nasdaq listing of 2026 so far. The $350 cash open is the first reference price the perp has had that wasn't a private-market secondary quote, and traders who had been arbitraging the pre-IPO basis through prediction markets and Hiive blocks finally have a live exchange print to mark against.

What $360.90 Implies

At $360.90 the perp is implying roughly $110 billion of equity value — about 1.95x the $56.43 billion fully diluted valuation Cerebras locked in at $185 a share, on the company's roughly 305 million fully diluted shares. That is still meaningfully above the $50–$60 billion debut-day market cap bucket Polymarket traders had favored ahead of the bell, and roughly 63% above the Hiive print. 24-hour perp volume on this market is now $194.76 million, up from $167.28 million an hour earlier — the tape is getting busier even as the price comes in, which is what real basis trading tends to look like. The cash close is the next reference point that matters; if Cerebras prints inside the $350–$380 range, the perp has nowhere left to run a premium against.