Bitcoin Traders Eye BOJ Decision as Yen Shorts Hit Nine-Year High

A heavy concentration of speculative yen short positions increases the possibility of a sharp squeeze if the Bank of Japan signals more aggressive tightening, potentially forcing an unwind of yen-funded carry trades that have been supporting risk assets.

Bitcoin traders usually focus on Federal Reserve meetings, but this week, attention may shift to Tokyo instead.

The Bank of Japan is broadly expected to raise its benchmark rate to 1% from 0.75% on Tuesday, which would mark the highest level since 1995. While this may appear to be a routine policy adjustment from a distant central bank, it carries more significance for crypto markets than it seems.

The reason lies in positioning. Leveraged funds increased net short bets on the yen to more than 115,000 contracts in the week ending June 9, the highest level since November 2017, according to Commodity Futures Trading Commission data. These positions reflect strong expectations that the yen will continue weakening, and they are heavily crowded.

If the BOJ follows through with a rate hike and hints at further tightening, those short positions could be rapidly unwound, driving the yen higher. A stronger yen would put pressure on carry trades that rely on borrowing in yen to fund investments in higher-yielding risk assets.

For years, these carry trades have supported rallies across equities, bonds, and, increasingly, crypto markets, with Bitcoin often benefiting indirectly from the liquidity environment they create.

A rapid unwind could therefore introduce broad market instability, including in Bitcoin.

A similar setup played out ahead of the BOJ’s July 2024 rate hike, when yen shorts were also at extreme levels. After the decision, a sharp unwind triggered a rapid yen rally and widespread volatility across global markets, including equities, Japan’s Nikkei index, and crypto. Bitcoin itself dropped from around $65,000 to near $50,000 within days of the announcement.

The current conditions closely resemble that earlier episode, which is why traders are closely watching Tuesday’s BOJ meeting.

If the rate increase arrives as expected and Governor Kazuo Ueda signals a cautious path forward, markets may largely absorb the move without disruption.

However, if the BOJ indicates faster or more aggressive tightening beyond 1%, it could trigger a stronger yen rally and renewed stress across global risk assets.

Given its sensitivity to liquidity shifts, crypto markets—and Bitcoin in particular—would likely be among the first to react.