Chip Designer Arm Jumps 25% in Debut Win for Owner SoftBank (3)

Arm Holdings Plc climbed 25% in its trading debut after raising $4.87 billion in the year’s biggest initial public offering, delivering a boost for both equity markets and SoftBank Group Corp. founder Masayoshi Son.

Shares of the chip designer, still 90% owned by SoftBank, closed at $63.59 in New York trading Thursday, giving Arm a market value of more than $65 billion. Including restricted share units, Arm’s fully diluted valuation is closer to $68 billion.

Arm on Wednesday sold 95.5 million American depositary shares at the top of a marketed range of $47 to $51 each. The shares opened ...