[Nikkei Recap] Sep 17, 2026: Nikkei 225 Gains 213 Points to 64,136 as Defense Stocks Surge and Nintendo Jumps 4% on Tokyo Game Show

Hey everyone, Hirokichi here.

Let’s take a look at Tokyo’s stock market on Thursday, September 17. The bottom line: the Nikkei 225 rose 213.25 yen from the previous day to close at 64,136.25 yen, its second straight day of gains. I’ll admit I was bracing for a rough session — the U.S. Federal Reserve had just delivered its first rate hike in roughly three years the night before, and the Dow tumbled on the news. But Tokyo held up well. Looking under the hood, though, it wasn’t a broad rally across the board — stocks with their own same-day catalysts, like defense names and gaming names, did the heavy lifting. Let’s dig into why.

How the indexes moved today

First, here’s a summary of the main indexes at the close.

What stands out here is that the rally wasn’t limited to large-cap indexes like the Nikkei and TOPIX — the Growth 250 index, which tracks smaller emerging companies, jumped over 2% too. In other words, buying was broad-based across company sizes today. On the Tokyo Stock Exchange Prime Market, 1,289 stocks rose (roughly 80% of the market) while only 235 fell. Trading value came in at 7.1538 trillion yen on volume of 1.95662 billion shares, both up from the previous day’s 6.7075 trillion yen (source: Nikkei, Kyodo News).

Looking at the recent trend, the Nikkei peaked near 65,270 on September 10, then slipped for two straight sessions on the 14th and 15th, before rebounding 439 points on the 16th and adding another 213 points today. Intraday, the gain briefly topped 700 points before easing back somewhat into the close.

What moved the market today

There are three main things worth understanding about today’s action.

(1) The U.S. Federal Open Market Committee (FOMC), which wrapped up its meeting on the 16th, raised interest rates by 0.25% — the Fed’s first hike in about three years. Fed Chair Kevin Warsh’s press conference struck a hawkish tone, hinting at further hikes ahead, which caught markets somewhat off guard. The 10-year Treasury yield climbed above 5% on the news, and the Dow Jones Industrial Average fell 631.21 points (-1.22%) to 51,461.90, its third straight decline. The S&P 500 dropped 33.92 points to 7,551.81, and the Nasdaq Composite also edged lower (source: Reuters, Yomiuri Shimbun).

(2) In the currency market, the rate hike drove the dollar higher and the yen weaker, with USD/JPY reaching around 155.62 yen at 4 p.m. Tokyo time — up 0.64 yen from the previous day’s 5 p.m. level (source: Kabutan). A weaker yen tends to boost the profitability of exporters, so it’s generally a tailwind for companies like automakers and machinery makers with a large share of overseas sales. In a way, the seemingly negative combination of a U.S. stock selloff and rising rates ended up supporting Japanese equities through the currency channel.

(3) Domestically, AI and semiconductor-related stocks saw profit-taking, while money rotated into previously lagging value stocks and names with their own fresh, same-day catalysts. Specifically, defense-related stocks rallied broadly after a report that Mitsubishi UFJ Bank plans to establish lending standards for defense companies, and gaming stocks caught a bid as the Tokyo Game Show 2026 opened at Makuhari Messe (source: Nikkei, Kabutan). Rather than simply tracking Wall Street lower, Tokyo’s market today was driven more by domestic, stock-specific news.

Today’s notable stocks and why they moved

Let’s look at five stocks that saw big moves today — what happened, and why.

This table shows a clear contrast: stocks with domestic, same-day catalysts like defense and gaming were the standout gainers, while AI and semiconductor names — which had been leading the market until recently — saw profit-taking.

Mitsubishi Heavy Industries (7011): Surged on defense-lending report

Mitsubishi Heavy Industries jumped 4.01% today. The trigger was a report in the September 17 morning edition of the Nikkei newspaper that Mitsubishi UFJ Bank is preparing to establish lending standards for defense-related companies. If those standards materialize, it should become easier for defense companies to raise financing, and the expectation that other megabanks will follow suit lifted defense-related stocks broadly, not just Mitsubishi Heavy. The stock also had company-specific news layered on top, including an investment in AI developer Preferred Networks and joint development of domestically made defense AI. It’s a good example of how a “funding side” story — a bank’s lending stance — can move stock prices, against the broader backdrop of Japan’s expanding defense budget.

Nintendo (7974): Up over 4% as Tokyo Game Show opens

Nintendo rose 4.29% today. The catalyst was the opening of the Tokyo Game Show 2026, one of the world’s largest gaming expos, at Makuhari Messe in Chiba today, which drew fresh attention to new titles and hardware. Bandai Namco Holdings and Square Enix Holdings also gained, suggesting the whole gaming sector benefited from the event. Nintendo’s stock has been quite volatile over the past few months on questions around Switch hardware and software sales trends, so it’ll be worth watching whether today’s event-driven pop is just a passing story or gets backed up by actual sales numbers in upcoming earnings and monthly data.

GENDA (9166): Rallied on strong monthly sales

GENDA, which operates amusement facilities, jumped 6.1% today, rebounding after three straight days of declines. The move followed the company’s after-market announcement on the 16th of preliminary August sales up 24% year-on-year. Compared to Mitsubishi Heavy or Nintendo, GENDA is a lesser-known name, but this is a clear example of a concrete monthly sales disclosure directly moving a stock price. Small and mid-cap stocks tend to swing more sharply on news like this than large caps do, and today’s GENDA move was a textbook case.

Tokyo Electron (8035): Profit-taking hits AI/semiconductor names

Tokyo Electron, a major semiconductor equipment maker, fell 1.39% today. Rising U.S. long-term interest rates and the prospect of further Fed hikes — both weighing on richly valued AI and semiconductor stocks — made the sector prone to profit-taking. While the Nikkei as a whole rose, money appears to have rotated out of the semiconductor names that had led the market for weeks and into defense and gaming stocks with more reasonable valuations and their own catalysts — a classic sector rotation day.

SoftBank Group (9984): Modest gain after a tug-of-war

SoftBank Group closed up 1.04% today. The stock opened firmer on overnight strength in U.S. semiconductor names, but gains faded during the session as caution around domestic AI-related stocks crept back in, leaving it with only a modest gain by the close. As the parent of chip designer Arm, SoftBank Group’s stock tends to get pulled in both directions by U.S. AI-stock sentiment and domestic AI-stock caution, and today’s price action was a clear example of that tug-of-war playing out.

How I’m thinking about this as an individual investor

If you’re steadily building a position through regular investing, there’s no need to get worked up over a single day’s 213-point gain. What stood out to me more today was that, despite macro headwinds like a U.S. stock selloff and a rate hike, stocks with their own domestic, stock-specific catalysts (the defense lending report, the Game Show opening) held the market up. Just looking at the headline index, you might wonder, “Why did Japan rise when the U.S. fell?” But looking under the surface, there was a fairly clear story: money rotating out of AI and semiconductor names and into previously lagging value stocks and event-driven names. If you’re trading individual stocks short-term, it’s probably more useful right now to think about which sector or theme your holdings belong to, rather than just watching the index level.

What to watch from here

(1) How U.S. long-term rates behave after the Fed hike. If the 10-year yield stays elevated above 5%, it could keep weighing on currencies and high-P/E growth names. (2) Whether buying in defense stocks spreads beyond Mitsubishi Heavy to names like Kawasaki Heavy Industries and IHI. (3) How long interest in gaming stocks holds up while the Tokyo Game Show runs through September 20 — outside of earnings season, it’s worth watching whether this kind of event-driven move has real staying power.

Let’s keep at it, slow and steady. See you tomorrow!

* This article is for informational purposes only and does not recommend any specific investment. Please make investment decisions at your own responsibility.

For a look back at the previous session, check out the September 16 daily recap as well.

日本語版はこちら → https://hirokichiiii.com/投資のいろは/nikkei-daily-2026-09-17/

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