[MARKET UPDATE] Choppy action seen in USD/JPY; falls from c. 159.50 to 158.20 in about 20 minutes, before swiftly reversing to 158.90

Rapid yen strengthenings from stretched levels, followed by partial retracement, are the signature shape that has historically accompanied suspected Japanese intervention episodes, though the same pattern also appears with fat-finger flows, option barrier defence, and thin-liquidity stop cascades. The distinguishing features desk lore applies: official operations tend to produce a larger, more one-sided first leg with follow-through sustained into the fix and across sessions, while flow-driven air pockets mean-revert faster and leave no footprint in the Ministry's subsequent monthly disclosure. Levels near round figures at multi-decade extremes are where verbal escalation from finance officials has typically preceded action, so proximity to those thresholds is the operative variable. The tells worth noting are whether the move broadens into other yen crosses and Asian session follow-through, whether officials shift from describing moves as excessive to signalling readiness to act, and the timing relative to Japanese and US data that drive the rate differential doing the underlying work. Absent confirmation of official selling, episodes of this kind have tended to fade, with the pair resuming its prior trend within sessions.