US Treasury Secretary went full judge, jury, and executioner on speculative yen shorts overnight with probably the most direct explicit jawboning we have seen in years...

“I am the house now, so when we intervene with the Japanese yen, I have pretty good insight into what the Japanese, what the Bank of Japan is going to do, what Japanese policymakers are going to do,” Bessent said at a Southern Methodist University event in Texas on Tuesday.

“And you can bet against me if you want.”

As Bloomberg reports, the comments were among Bessent’s most strident yet in an extraordinary campaign to bend markets to his will, even in the face of investor skepticism.

The former hedge fund executive, who made his name with outsized currency wagers, recently oversaw the first purchases of yen by US authorities in three decades and surprised market participants last month with plans to ramp up buybacks of US Treasuries to restrain a surge in yields.

He argued that Treasury has an informational advantage because of its visibility into Japanese policymakers and the BOJ.

“Whenever people say, ‘Oh, well, Treasury Secretary is taking a risk,’ - well, it’s my dream, I have asymmetric information,” Bessent said.

Bessent’s remarks also underscore his unusual level of engagement on economic policymaking in Japan, which is among the world’s largest holders of US debt.

Bessent has coordinated with Japan Finance Minister Satsuki Katayama on currency interventions and put increasingly public pressure on the central bank to raise interest rates, a move that would support the yen and reduce Japan’s need to sell Treasuries for market intervention.

“Bessent’s remarks carry immense weight. The message is clear: do not defy the Treasury Secretary,” said Tadashi Matsukawa, head of bond investments at PineBridge Investments Japan Co. in Tokyo.

“The old way of thinking — that interest rates would be raised once every few months — no longer applies.”

Interestngly, Takumi Naya, head of the FX trading group at Sumitomo Mitsui Banking Corp.’s global markets operations department, suggested that,“Bessent’s remarks suggest that he expects a correction in the yen’s strength even at current levels."

Bessent's remarks have certainly flipped the positioning with hedge funds now betting the yen will strengthen beyond 150 per dollar by year-end, with some longer-dated options trades targeting a move to 140.

“Leveraged investors have been active and reacting to a potential regime change in the currency,” said Jerry Minier, global head of linear G-10 FX trading at Citigroup in London.

“Option structures targeting dollar-yen below 150 by year-end have been popular.”

Nomura has seen a similar shift toward bearish dollar-yen sentiment among macro hedge funds that seek to profit from market swings triggered by economic or political events.

There has been “much stronger demand for downside in the option space from the macro community who have shifted to increasing shorts, particularly since we broke 155.00 as most viewed that as a support line in the sand,” said Graham Smallshaw, Singapore-based senior foreign-exchange spot trader at Nomura.

While there was some profit-taking on Sept. 8 when the pair dipped below 153, “the view for now is very much concentrated on the 150/152 target,” he added.

The stance contrasts with that of Japanese retail investors, who boosted their net short-yen positions to an estimated ¥3.61 trillion ($23.5 billion) last week, according to a Bloomberg compilation of data from the Financial Futures Association of Japan and Tokyo Financial Exchange.

“Bessent’s ‘I am the house’ remark reflects the mindset of a former trader who truly understands market dynamics, which is likely why the market shows him a certain level of respect,” said Kazushige Kaida, head of FX sales at State Street Bank & Trust Co.’s Tokyo branch.

“Whether it’s US Treasuries or the yen, his series of verbal warnings are probably aimed at correcting what he sees as moves that have gone too far.”

However, as Goldman's Delta-One desk-head, Rich Privorotsky noted, "whatever you think of the rhetoric... the yen objectively continues to appreciate as the market leans into BOJ tightening/repatriation."

But, he adds, the secondary implication matters more for equities... "what happens as yen funded carry trades unwind back into Japanese bonds/equities?"

"The S&P and mega cap complex have felt strangely heavy without a great fundamental reason.

Worth keeping in the back of the mind that some leverage/carry may simply be diffusing out of the system."

Be careful what you wish for Judge Bessent...