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Nikkei 225 soars as Softbank stock surges, foreigners scoop Japan shares

Nikkei 225 soars as Softbank stock surges, foreigners scoop Japan shares
Crispus Nyaga
May 20, 2026, 22:55 PM

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Buy SoftBank Group (9984.T)

SoftBank is the catalyst driving the Nikkei: shares jumped 20% on OpenAI’s IPO timing and the SB Energy IPO path. The setup is a rerating of Son’s AI/data-center portfolio plus a near-term “realization” window as IPOs monetize Vision Fund assets. Ride momentum with a clear fundamental tailwind: AI demand + power/data-center buildout.

Key Risk: OpenAI’s IPO disappoints (or SoftBank’s stake value gets marked down), causing the market to unwind the AI-IPO optimism fast.

Buy Japan banks/financials (e.g., MUFG 8306.T)

Foreign inflows into Japan are explicitly accelerating, and a weaker yen is pulling capital into exporters and financials. Banks tend to benefit when global investors rotate into Japan and when funding/credit sentiment improves. Pair this with the Nikkei’s bullish breakout: flows usually lift the whole complex, not just tech/holdings.

Key Risk: The yen strengthens sharply (BoJ intervention or a policy shift), reversing the foreign “cheap yen” bid and hitting financials’ near-term earnings expectations.

  • The Nikkei 225 Index rose by over 3% as Softbank stock soared.
  • Softbank jumped ahead of the upcoming OpenAI IPO.
  • Foreign investors are buying Japanese stocks aggressively.

The Nikkei 225 Index surged by over 3.5% today, May 21, its best day in weeks, helped by numerous catalysts, including the potential US-Iran deal, foreign buying of Japanese stocks, and the soaring Softbank stock. It jumped to ¥61,940, higher than this week’s low of ¥59,460. 

Nikkei 225 Index is rising amid a soaring Softbank stock surge

One of the main catalysts for the soaring Nikkei 225 Index is Softbank, which jumped by over 20%, its best single-day performance in weeks. This surge happened after OpenAI, the parent company of ChatGPT, revealed that it was going public soon. 

The IPO will be an important period for Softbank, which has borrowed heavily to invest in the company. Precisely, it borrowed $60 billion to invest in it, making it one of the biggest shareholders. Most recently, its AI bets helped to fuel a $46 billion jump in Vision Fund profits.

OpenAI was recently valued at over $800 billion in its IPO, and with demand for AI companies soaring, there is a likelihood that it will get to a $1 trillion valuation soon.

The challenge, however, is that its growth has slowed in the past few months as many customers have moved to Anthropic’s Claude. As a result, there is a risk that the stock will drop after going public, which may reduce Softbank’s potential return. 

Softbank stock is also soaring because of the upcoming SB Energy IPO in the United States. Masayoshi Son’s company and OpenAI have all invested in SB Energy, a company that develops large-scale power and data center projects. It is part of the Stargate project, which includes OpenAI, Oracle, Softbank, and MGX. These IPOs will help Softbank to realize its investment over time. 

Foreign investors are investing in Japanese stocks

The Nikkei 225 Index is also soaring after official data showed that foreign investors were investing in Japanese stocks aggressively. They bought shares worth over ¥948 billion last month after buying ¥1.28 trillion a month earlier. 

Some of these investors are taking advantage of the weaker Japanese yen to scoop up Japanese companies. The yen has dropped closer to 160, a level that triggered intervention by the BoJ recently.

Meanwhile, the index is also benefiting from a statement by Donald Trump on Wednesday. He told reporters that the United States and Iran were nearing a deal to end the war. This statement fueled the US stock market rally and a sharp decline in crude oil prices.

Nikkei 225 Index technical analysis 

Nikkei 225

NI225 Index chart | Source: TradingView

The daily chart shows that the index has formed a perfect bullish chart pattern. It formed a cup-and-handle pattern, a common bullish continuation sign in technical analysis. 

It then made a strong bullish breakout and then retested the upper side on Wednesday. A break-and-retest pattern normally confirms a bullish outlook.

The index has remained above all moving averages. Therefore, the most likely scenario is where the index continues rising, potentially to the year-to-date high of ¥63,805. A move above that level will point to more gains, potentially to ¥64,000.