Buff head didn’t explicitly state he was moving his pile of USD to the yen. This was on X. https://x.com/suyog_dhavan/status/2000752893146882459?s=61 “ A Correction-

Warren Hasnt Yet Said, He is Fully Shifting His Cash Pile to Yen. Buffet's investments in Japan (around $35 billion Approx in stocks), this represents a small fraction of its total cash position, which hit a record of approximately $382 billion in late 2025. The vast majority of Berkshire's cash pile remains in US Treasuries and other dollar-denominated assets.

Buffett has expressed concerns about the long-term fiscal trajectory of the U.S. and the potential for the dollar to devalue, but he has not confirmed shifting his entire cash reserves out of the dollar in a panic yet.”