The Month-End Fix Is Two Hours After the Option Cut Today. On Monday It Is One.
Today is the last business day of October, so the 16:00 UTC London fix carries month-end rebalancing — and the 10am New York option cut is at 14:00 UTC, two hours earlier.
Until last Friday the gap was one hour and from Monday it is one hour again, because London left summer time on 25 October and New York leaves it on 1 November. By our own arithmetic off three sources' transition dates, the two offsets are misaligned for about three weeks in March and one week now, and this month-end falls inside the short one. A window open 13:45–14:15 UTC covers today's cut and closes an hour and three quarters before the fix; the same window on Monday covers nothing, because the cut has moved to 15:00. We also have to correct ourselves: on 28 October we wrote that the cut "is 14:00 UTC every day and the Fed announces at 18:00 every time", and both halves stop being true on Monday — the December decision announces at 19:00. On the board, a mirror gives euro strikes layered 1.1150 to 1.1200 with the larger ones nearer 1.1175, one yen strike at 158.00 and one Australian at 0.7025, and no notionals at all for the fourth consecutive time. The publisher's undated expiry address served a board bylined 29 January — yen strikes at 150.00 against a 157 spot — with October sidebars, which is the opposite of yesterday's one-day-stale board: the detectable staleness is the harmless kind. The only month-end rebalancing note we could read is August's, so we publish no signal. Three Fed speakers sit from 16:00.