SoftBank Group Corp. shares surged as its paper profit from the initial public offering of DoorDash Inc. hit $11.2 billion, adding to gains from the prospect the Japanese company could attempt to go private.

The Tokyo-based company’s stock rose 11% Thursday to 8,306 yen a share, the biggest jump since March. DoorDash shares closed up 86% on the first day of trading, giving the food-delivery company a market capitalization of $60 billion.

SoftBank’s stock had already surged to a 20-year high on Wednesday, after Bloomberg News reported founder Masayoshi Son is considering a ‘slow-burn’ buyout to take the company private. The shares are up 75% this year so far, pushing its market valuation to more than $165 billion.

“DoorDash plus yesterday’s news about the MBO have seen investors rushing to get a piece of SoftBank,” said Justin Tang, head of Asian research at United First Partners in Singapore. “It was a perennial concern that SoftBank cannot monetize its investments. That narrative is changing and Vision Fund results are likely to have more impact on the share price going forward.”

About $5.3 billion worth of SoftBank shares traded hands Thursday, equivalent to one-fifth of the total trading value of $26 billion on the first section of the Tokyo Stock Exchange on Thursday.

The DoorDash gain could raise profit in SoftBank’s Vision Fund unit to its highest ever, after record losses in the last fiscal year. The global rally in technology shares has lifted the value of stakes in public firms like Uber Technologies Inc. and improved the prospects for startups in its portfolio.

Vision Fund’s profit in the coming quarters is likely to receive a boost from more portfolio companies planning IPOs, a list that includes South Korean e-commerce giant Coupang Corp., online insurance platform Policybazaar and used car retailer Auto1 Group GmbH.

SoftBank owns 20% of DoorDash post IPO, a stake it acquired over a period of two years for $680 million. The Vision Fund first invested in DoorDash in the spring of 2018, acquiring almost 51 million shares at a price of $5.51. It did so again twice the following year, as the price climbed to $22.48 and $37.94. The final round this June saw SoftBank pay $45.91 for just a little over 1 million shares.​

DoorDash had 50% of U.S. market share as of October, surging past UberEats, GrubHub and Postmates, according to its filing documents. That number is up from just 17% in January 2018. DoorDash said there is also an opportunity for that market to expand, with fewer than 6% of U.S. residents currently using its service. Revenue in the first nine months of the year more than tripled and its net loss narrowed from a year earlier on a surge in new customers, the company said.

“DoorDash is an example of what a successful IPO can look like and people are buying SoftBank on the expectation that profit will continue to grow,” said Makoto Kikuchi, chief investment officer at Myojo Asset Management Co. “Investors are once again recognizing Son’s skill as an investor.”