Hedge funds have reportedly built one of their biggest bearish bets on the Japanese yen in years, lining up around 85,000 net shorts as pressure on the currency mounts. As tensions on the yen mounted, Bitcoin fell below $87,000 in early December, wiping out about $527 million in long positions in just 24 hours.
All of this is part of a larger macro story. Rising Japanese bond yields, changing central bank policies and a huge carry trade in the yen that is now flowing directly into our crypto portfolio.
(source – BTC JPY, TradingView)
Japanese yen short squeeze?
Let’s translate the jargon. A short position means that traders borrow something (in this case the yen), sell it and hope to buy it back cheaper later. Hedge funds now own about 85,000 net short yen contracts, one of the largest, boldest and bearish positions since 2024.
🇯🇵 HEDGE FUNDS SHORT JAPANESE YEN
Speculators have net short yen contracts of ~85,000, the second highest since July 2024.
2 weeks of heavy bearish betting.
Interest rate difference between the US and Japan ~3%.
Real interest rates in Japan are still deeply negative.Same setup as 2024 before USDJPY >160.
Yen under pressure again. 😱 https://t.co/u2tm5rRQIj pic.twitter.com/9854RS0NCR
— Geldaap (@TheMoneneyApe) December 30, 2025
Why attack the yen? Japan kept interest rates ultra-low for years, while other central banks raised interest rates. That made the yen the cheap ‘financing currency’ for a huge carry trade. You can borrow yen at a low interest rate and use it to buy higher-yielding assets elsewhere. It is an arrangement where you can take out a low-interest loan in one country and buy a high-interest bond in another.
Carry trading in the yen has ballooned to roughly $500 billion since 2011, and analysts say about $200 billion of that trade has already been unwound in recent weeks.
This isn’t just FX nerd drama. When these trades come to a halt, investors sell what they bought with the borrowed yen – which often includes stocks, bonds and yes, crypto. That’s how currency stress jumps the fence in your Bitcoin chart.
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How does a weak Japanese yen affect Bitcoin and other cryptocurrencies?
Rising yields on Japanese government bonds eased the first game. The 10-year JGB gained about 1.84%, leading to a multi-asset sell-off and over $640 million in crypto liquidations. When interest rates rise, “safe” assets in traditional markets pay more, so some traders are taking money from riskier bets like altcoins and meme coins.
Bitcoin took a direct hit. During an intense phase of the Japanese yen-driven relaxation, BTC fell below $87,000, and Longers saw about $527 million disappear in one day. This ugly volatility stemmed from forced deleveraging, as exchanges automatically closed positions when traders ran out of margin.
IF THE FED DECIDES AND RAISES THE BOJ IN DECEMBER, THE INTEREST RATE DIFFERENCE BETWEEN THE US AND JAPAN WILL COLLAPSE.
A stronger yen and a weaker dollar suddenly make years of cheap yen-funded bets expensive to maintain.
That forces investors to calm down and sell assets to redeem their yen positions.… pic.twitter.com/sKA4tiA6wZ
— Crypto Rover (@cryptorover) December 3, 2025
We have seen similar macro shocks before, especially when markets revalued US interest rate expectations; crypto usually backed down hard. The yen story is the same movie on a different channel: global money is getting jittery, liquidity is tightening, and cryptocurrency traders are paying the price.
What does this macro stress do to Crypto?
Understand the pattern first. A weakening yen often signals tighter global liquidity. That usually means less cheap money lying around for speculative bets in Bitcoin, altcoins and DeFi. When traders settle their carry trades, they are not just selling yen; they raise money everywhere to close positions.
Secondly, the Japanese central bank is more important for your wallet than you think. The Bank of Japan’s moves on interest rates and bond purchases have previously influenced Bitcoin swings, which we discussed in our article on the BOJ rate hikes. If the BOJ tightens more aggressively or bond yields start to rise again, we should expect more “out of nowhere” cryptocurrency volatility.
The BOJ rose by ..25 basis points
I mean, the market expected 50 bp, some said 75 bp.
And so the yen weakens.
Let the chaos ensue pic.twitter.com/pOTKxjBgEh
— Peter R Hann Goldbug Weirdo/Silver Affectionado (@PeterRHann1) December 19, 2025
Third, major funds treat Bitcoin as one piece of a global risk puzzle. When they panic about currencies and bonds, they dump crypto along with everything else. That doesn’t mean Bitcoin is broken. It means that macro flows, and not news from the chain, set the tone in the short term.
How should we, crypto investors, manage this shock?
Start with risk, not FOMO. These types of moves especially affect over-indebted traders. If you use margin or high leverage on futures, you are in the explosion zone when macro shocks hit. Consider reducing leverage or avoiding it altogether if you’re still confused about how these global stories are affecting prices. One thing is certain: leveraged trading is prone to manipulation.
Then zoom out and diversify your ‘defense’. Some investors balance Bitcoin with cash, gold ETFs or other hedges when macro stress increases, just as we discussed in our article here.
Although that doesn’t mean we should abandon the crypto ship. It means that you should avoid investing 100% of your liquid assets in assets that fluctuate 10 to 20% according to central bank figures. We know that crypto needs a trigger to make itself move, and sometimes the move is already decided, but market makers need a trigger.
Every day you are told:
• what you should be afraid of
• what to ignore
• what to believe
By the time it hits the news, the story has already been decided.
Crypto only exposes what has always been true— SpinCoinArmy (@SpinCoinArmy) December 26, 2025
Finally, upgrade your information diet. Macro news like “Jen shorts rise” or “BOJ signals policy change” are now almost as important as crypto-native news. By tracking key indicators like USD/JPY, Japanese bond yields, and major central bank meetings, you can understand whether a Bitcoin dump comes from crypto fear or global deleveraging.
Hedge funds will continue to push their positions on the yen, but you don’t have to play that game. Focus on position size, low or no leverage, and a time horizon longer than the next BOJ press conference, and macro storms like this become noise rather than a wipeout event.
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