Kioxia Stock Crash Wipes Out Margin Traders — 5ch: ‘Whoever Catches the Falling Knife Wins’

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The story

As shares of semiconductor maker Kioxia Holdings went into a steep slide, the losses suffered by individual investors believed to be holding large margin positions became a hot topic on 5ch. Adjusted for the pre-split price, the stock reportedly climbed from around 25,000 yen to briefly top 70,000 yen, before crashing back down to the 8,400 yen range according to reports within the thread. Posters debated how margin trading works, the “two-story” technique of using NISA tax-free investment allowances as collateral, and whether such losses are really a zero-sum game.

What people said

6AnonymousNov 6, 2026 14:15
Did he cut his losses himself before the margin call hit?
Smart move.
85AnonymousNov 6, 2026 15:03
Re: #6
Here comes the margin-call police.
7AnonymousNov 6, 2026 14:17
Me: 'It's probably dropped below 10,000 by now… let's see…'

8,400 yen.
9AnonymousNov 6, 2026 14:18
Is margin trading really something people just dive into that casually?
10AnonymousNov 6, 2026 14:18
It's gotta be fake, right?
14AnonymousNov 6, 2026 14:20
Re: #10
Outstanding margin-buy balance: 50 million shares.
That's how many margin buyers are actually out there.
11AnonymousNov 6, 2026 14:20
Guys like this probably have other assets and are just doing it for fun.
If it were for real, they couldn't tweet about it this calmly.
16AnonymousNov 6, 2026 14:21
Re: #11
Even if it's just for fun, torching 50 million yen is still brutal.
17AnonymousNov 6, 2026 14:21
Re: #11
Don't talk like Hiroyuki (the 2channel founder known for his detached, needling commentary).
12AnonymousNov 6, 2026 14:20
Buzzword-of-the-year candidate:
Kioxia

By the time the award ceremony rolls around it'll probably have dropped even further — who's even going to show up to accept it?
13AnonymousNov 6, 2026 14:20
No way someone jumps straight into margin trading as their very first stock move — this has got to be AI (bot-generated).
15AnonymousNov 6, 2026 14:20
I do wonder what's going through the head of a margin trader who isn't even a blue-check (verified/engagement-bait account) but still posts a solid loss-cut screenshot.
18AnonymousNov 6, 2026 14:21
But why Kioxia of all things? Borrowing money to bet on a stock that shot up dozens of times over in a short span and was obviously bound to pop — not even (the gambling manga protagonist) Kaiji would pull that stunt.
19AnonymousNov 6, 2026 14:21
It shot up to 70,000 when it was around 25,000 pre-split? Seriously?
Why did it climb that much in the first place?
20AnonymousNov 6, 2026 14:22
This just proves money is meant to be spent.
People who have nothing but money, trying to achieve something with it, end up like this.
22AnonymousNov 6, 2026 14:23
Looked away for one second and it's already at 8,299, lol.
23AnonymousNov 6, 2026 14:24
I want to see someone who went all-in for a comeback and got completely cooked.
29AnonymousNov 6, 2026 14:30
Whoever catches the falling knife wins.
67AnonymousNov 6, 2026 14:52
Re: #29
Whoever picks it up after it's already fallen wins.
32AnonymousNov 6, 2026 14:31
On the flip side, someone out there made 50 million yen off this, so it balances out to zero, right?
38AnonymousNov 6, 2026 14:35
Re: #32
Wait, do you actually think stocks are a zero-sum game?
50AnonymousNov 6, 2026 14:41
ttps://i.imgur.com/r4hmMRQ.jpeg
55AnonymousNov 6, 2026 14:45
Re: #50
If you're going to fake a sob story ("uso-matsu" — a made-up tale posted for attention), you could at least look up how NISA actually works first.
57AnonymousNov 6, 2026 14:47
Re: #50
Full-leverage margin trading on top of NISA using cash holdings?
Can someone translate this into plain speech?
104AnonymousNov 6, 2026 15:16
Re: #50
The NISA allowance can't be used as substitute collateral securities, so stacking a second or third "floor" on top of it isn't actually possible.
70AnonymousNov 6, 2026 14:52
Re: #57
He probably just used the Kioxia shares he bought through NISA as collateral to buy more Kioxia on margin.
That makes it two floors — but if you call it three floors, what's the extra step supposed to be?
87AnonymousNov 6, 2026 15:05
Re: #70
Kioxia bought through NISA
Kioxia bought with cash outside the NISA allowance
Kioxia bought on margin
74AnonymousNov 6, 2026 14:54
Re: #1
Oh
it's this guy
He pulls in 60 million yen a year, so
this barely even stings for him.
84AnonymousNov 6, 2026 14:59
Re: #74
Working a whole year for nothing is plenty painful though.
102AnonymousNov 6, 2026 15:16
Re: #74
Nobody loses a year's salary for zero real gain and just shrugs it off.
89AnonymousNov 6, 2026 15:06
I don't really get margin trading — is it basically borrowing money to buy stocks?
90AnonymousNov 6, 2026 15:08
Re: #89
Yeah, basically.
Using leverage lets you trade with more money than you actually have on hand.
91AnonymousNov 6, 2026 15:08
Re: #89
You put up collateral first, and as long as your losses stay within that range, it doesn't technically become debt.
92AnonymousNov 6, 2026 15:08
Re: #89
Exactly.
And if the stock price drops too far, your position gets force-sold and you're left holding the debt.
95AnonymousNov 6, 2026 15:11
Are there no pitiable JT (Japan Tobacco stock) holders in a similar boat?
109AnonymousNov 6, 2026 15:20
Re: #95
I'm holding it outright for the long term, but I'm nervous as hell about when it'll even get a price quote.

99AnonymousNov 6, 2026 15:15
The classic 'crash-only' uncle who only shows up when stocks tank to say 'yeah, you really shouldn't trade stocks,' or the uncle who calls everyone who trades stocks an idiot because 'you're guaranteed to lose.'
101AnonymousNov 6, 2026 15:15
Re: #99
Well yeah, this is their guaranteed-win moment in the one-upmanship contest.

Background and Key Points of This Discussion

Margin trading is a system where you deposit collateral (margin) with a brokerage and can then buy and sell stocks for amounts exceeding your own cash on hand — but if the share price crashes, you risk losses beyond that collateral, triggering what’s known as a “margin call” (oitsusho). The “two-story” technique discussed in the thread — using the appraised value of outright-held shares as substitute collateral securities to layer a NISA position on top — runs into a snag, as reply 104 points out: the NISA allowance itself cannot be used as substitute collateral, so posters in the thread were divided on how far such a structure could actually go. There was also a misunderstanding among replies 32, 38, and 72 that treated the situation as a “zero-sum game,” even though stock trading involves both a seller and a buyer, meaning one party’s loss doesn’t automatically become another investor’s gain. Kioxia is a stock whose price swung wildly in a short period on semiconductor-market speculation, and that climate made it easy for individual investors’ margin positions to balloon — a key piece of background behind this whole episode.

※This article is excerpted and summarized from the 5ch (Nandemo Jikkyo G) thread “[Image] Kioxia Margin Traders Get Wrecked lmaooooo.”

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