Tokyo was the only Asian market actually trading on the Iran news when the board was fetched Sunday evening, and it went down. The Nikkei 225 stood at 63,165, off 1,197 points [1]. Recomputed against the implied prior close of 64,362, that is a decline of 1.86 percent, matching the page exactly.
The direction is the part worth stopping on. Western markets spent Sunday evening pricing the canceled strike on Iran as risk-on: crude down $4.12 to $80.55, a 4.87 percent drop on our recomputation, with US equity futures higher [3][1]. Tokyo went the other way, and not by a little.
Why is the question the sourcing does not answer. Nothing on the fetched pages states a cause for the Nikkei's fall. There is a coincident move on the currency board, with USDJPY down 0.84 percent, meaning a stronger yen [2], which is the sort of move that compresses reported earnings for Japanese exporters when it persists. No fetched source connects the two, and this piece does not connect them either. A plausible mechanism is not a reported one, and the gap between those two things is where bad market copy lives.
The rest of the Asian board could not be read at all, which is the more useful warning. Hang Seng and the Shanghai Composite were both still displaying their July 31 closes at fetch time, 25,884 and 3,832 [1]. Hong Kong and Shanghai had not opened for Monday. India's Sensex and Taiwan's benchmark carried the same July 31 date stamp. Taiwan's board figure, a gain of 7.98 percent, is a stale multi-session number rather than a session move, and reporting it tomorrow as a reaction to this weekend's news would be a spectacular error [1].
The difference between an index that has traded and an index showing last week's close is invisible on a screen that puts both in the same table with the same formatting and the same green and red. One column of that table was live.
What can be said tonight is narrow and worth saying anyway. One Asian benchmark had reacted to the Iran de-escalation by the time we looked, and it fell 1.86 percent while Western risk assets rose. Four others had not opened. Any account of how Asia responded is built on that single index and four stale closes until Hong Kong, Shanghai, Mumbai and Taipei actually print.
A 1.86 percent session is roughly $186 on every $10,000 of index-tracking exposure, arithmetic on the verified percentage rather than a claim about any real position. The person holding it is owed the size of the move, which is documented, before anyone hands them a cause, which is not.
