Cadence Design Systems unexpectedly yanked its two-month-old unsolicited bid for rival Mentor Graphics Friday, scrapping a deal that would have given the chip design industry some much-needed consolidation. In pulling the $1.6bn all-cash offer, Cadence blasted Mentor for refusing to open its books. According to Cadence, that prevented it from lining up lenders to cover the $1.1bn it was planning to borrow for the deal. Mentor disputed that. It added regulatory review would have likely dragged out the process. Whatever the case, Mentor investors didn’t stick around. Mentor stock plummeted 26% to close at $10.33, compared to Cadence’s offer of $16 per share. For its part, Cadence stock rose 7%. Still both stocks are below the level they were when the dance began.