Nikkei plunges 1,713 points, closing below 63,000 for the first time in about 3 months

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The story

On the 22nd, the Nikkei Stock Average fell 1,713.40 yen from the previous day to close at 62,907.84, dropping below the 63,000 line. This marks the first time the closing price has fallen below 63,000 in roughly three months, since July 30’s close of 61,867.43. A slide by major U.S. chipmaking-equipment maker Lam Research in after-hours trading, combined with alarm over a vulnerability discovered in PHP — the programming language used by roughly 70% of the world’s websites — intensified selling in AI- and semiconductor-related stocks. The yen’s strengthening to around 157.20 per dollar also weighed on the market. On 5ch threads, comments crossed paths: new-NISA investors still making monthly contributions worried about unrealized losses, some fretted over an AI bubble bursting, and others recalled the slow, grinding decline of the 2008 Lehman Shock.

Nikkei falls sharply by 1,713 yen, closing below 63,000 for the first time in about 3 months — closing bell on the 22nd

In afternoon trading on the 22nd, the Nikkei Stock Average fell sharply, down 1,713.40 yen from the previous day to 62,907.84. The TOPIX (Tokyo Stock Price Index) also declined, down 46.23 points to 3,997.50. The Nikkei closed at its low for the day, marking its first close below 63,000 since July 30 (61,867.43). Buying and selling crossed in the morning session, with the index briefly turning positive, but after U.S. semiconductor-equipment maker Lam Research fell in after-hours U.S. trading, selling pressure intensified on AI- and semiconductor-related stocks in Tokyo as well. Concerns were also raised over the impact of a serious vulnerability found in PHP, the programming language used by roughly 70% of the world’s websites. The yen strengthening from its morning level to around 157.20 to the dollar added further pressure.

Trading volume on the Tokyo Stock Exchange Prime Market was 2.19167 billion shares, with a trading value of 7.0569 trillion yen. Among traded issues, 684 rose, 821 fell, and 48 were unchanged.

Source: finance.yahoo.co.jp / Original article here

What people said

3AnonymousOct 22, 2026 16:03
Please, just not the Inuyama Line (a Nagoya-area train line).
99AnonymousOct 22, 2026 16:31
Re: #3
The main line's fine though?
10AnonymousOct 22, 2026 16:06
Someone from my Kioxia cult tell me this is the bottom.
16AnonymousOct 22, 2026 16:06
Re: #10
Honestly, I think the bottom's still a long way down.
12AnonymousOct 22, 2026 16:06
Isn't this partly the hacking fallout too? If trading gets wrecked and everything craters across the board, that's a real headache for the government as well.
24AnonymousOct 22, 2026 16:08
Re: #12
You never know what's coming. Any foreign investor with normal nerves would be closing out positions right about now.
27AnonymousOct 22, 2026 16:08
When does my Kioxia bought at 80,000 yen get saved?
39AnonymousOct 22, 2026 16:14
Re: #27
Now's the time to buy, hang in there.
32AnonymousOct 22, 2026 16:11
Seriously? I only just opened my NISA account.
36AnonymousOct 22, 2026 16:12
Re: #32
You think you can beat AI-driven hacking decades from now? Physical gold is the only thing you can actually trust.
48AnonymousOct 22, 2026 16:16
Isn't dollar-yen about to break below 150?
61AnonymousOct 22, 2026 16:20
And so begins the new-NISA bankruptcy ♪💸
82AnonymousOct 22, 2026 16:25
Re: #61
That's what you'd think, right? Actually, most people haven't finished their contributions yet, so a crash right now actually helps.
64AnonymousOct 22, 2026 16:21
Buying 10-year Japanese government bonds.
74AnonymousOct 22, 2026 16:24
Re: #64
The 10-year bond is crashing too. This might be the peak. Only 5 days left until the deadline.
77AnonymousOct 22, 2026 16:25
My NISA account is now showing a 1,000 yen unrealized loss.
Too brutal.
84AnonymousOct 22, 2026 16:26
Re: #77
That's suicide-level rough.
87AnonymousOct 22, 2026 16:27
Re: #72
When stocks get sold off, currency hedging flows push the yen stronger.
145AnonymousOct 22, 2026 16:54
AI-related earnings are actually good, yet the recent moves might as well be called a meltdown… I'd really like a proper technical explanation. As an amateur I have no clue what's going on.
152AnonymousOct 22, 2026 17:01
Re: #145
Same as civil engineering and construction stocks after the 2011 (3/11) earthquake — AI stocks are just hunting grounds for speculators right now.
154AnonymousOct 22, 2026 17:02
Re: #145
Great earnings are already priced in, so even a quarter with 'record-high profit' will still trigger a sell-off if it doesn't exceed the market's already sky-high expectations.

Also, even if one company's earnings are good, if any major AI-related stock shows a hint of weakness, the whole AI sector gets dragged down with it.
206AnonymousOct 22, 2026 17:30
Re: #145
Probably because there are concerns over capital spending.
149AnonymousOct 22, 2026 16:57
So much for the fake boom the stock market was propping up.
156AnonymousOct 22, 2026 17:03
Re: #149
It wasn't fake though. Stocks soared and wages actually went up a bit too. If it weren't for the cyberattack, we'd have been riding high through year-end.
157AnonymousOct 22, 2026 17:03
If they talked everyone into opening NISA accounts and then the Nikkei drops below 50,000, I will not forgive that.
159AnonymousOct 22, 2026 17:05
Re: #157
In a few years it'll get cracked and the whole system will collapse. AI's power is terrifying — it's seen as more dangerous than nuclear weapons.
166AnonymousOct 22, 2026 17:07
Is the NISA crowd even still breathing?
179AnonymousOct 22, 2026 17:20
Re: #166
Mine's just monthly contributions, totally fine.
169AnonymousOct 22, 2026 17:11
Re: #166
They'll probably crash it right when everyone's NISA gains peak. Straight from the height of good times into hell. For an AI, that's child's play. The moment your money's just digital numbers, it's nothing but a pie in the sky.
174AnonymousOct 22, 2026 17:15
Re: #169
That's just wishful thinking on your part. Plenty of people cash out right at the peak anyway, and since everyone's investing on a different timeline, there's no way to make everyone lose at once — some people aren't cashing out for another 30 years.
173AnonymousOct 22, 2026 17:15
187AnonymousOct 22, 2026 17:24
During the Lehman Shock too, it dropped a little every single day. Every so often it would tick up and people would cheer (lol), but the next day it'd drop again. Rinse and repeat, and before you knew it you'd look up and think 'wow, this has really come down a lot.' No matter what, it just wouldn't go up — just a slow, grinding slide.
196AnonymousOct 22, 2026 17:27
Re: #187
Right, and it just kept going, and that's where we are now. You don't actually have money, do you? That's basically how it works.
190AnonymousOct 22, 2026 17:25
If the AI bubble pops, who knows what happens next.
200AnonymousOct 22, 2026 17:28
Re: #190
I guess it'll give back whatever the semiconductor rally added. The Nikkei gained something like 30,000 points off that, right?

Background and key points of this discussion

The Nikkei’s pullback is largely a reaction to overheated expectations around AI and semiconductor stocks. The trigger — a sharp after-hours drop by U.S. chipmaking-equipment giant Lam Research — spread caution across the market about the sustainability of AI-related investment. The other factor, the PHP vulnerability, was taken seriously precisely because PHP is used by roughly 70% of the world’s websites, meaning exploitation could potentially affect the internet as a whole. It’s easy to overlook that Japan’s new NISA tax-free investment program only launched in 2024, so most participants are still just a few years into their contribution period — even with unrealized losses now, that doesn’t necessarily mean they’ve fallen far below their average purchase cost. Some comments in the thread tied the market plunge to an evaluation of the government in power at the time, but this article excludes replies containing political commentary.

*This article is excerpted and summarized from the 5ch (News Flash+) thread “[Breaking] Nikkei falls sharply by 1,713 yen, closing below 63,000 for the first time in about 3 months.”

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