Four rising weeks and a 96th-percentile gain test a fixed loss limit
Should the fund raise its ETH position size after a 21.23% week, or hold size and re-anchor its fixed loss limit to the 65.7% realised volatility and 24.88% range?
The market facts are real; the decision maker is illustrative.
The week and the position
In the week of 3 February 2020, ETH rose from 188.48 to 228.49 (+21.23%), a return at the 96th percentile of 103 weeks of history, after four consecutive up weeks of 8.25%, 13.80%, 0.64% and 12.23%. It closed in the upper third of its range, still 36.15% below its 52-week high, with volume 1.92 times the prior 12-week average. Eight-hour funding averaged 0.0454% and peaked at 0.1362%. ETH beat BTC by 12.44 percentage points. An illustrative fund adds to winners but must cut exposure at a fixed loss limit.
Judgment
A fixed loss limit set against the prior weeks' gains of 0.64% to 13.80% could be reached by an adverse move in a week like this one, forcing a cut when the position is largest; positive eight-hour funding, which averaged 0.0454%, means longs pay shorts. Keep the size unchanged and re-anchor the limit to the 65.7% realised volatility and the 24.88% weekly range rather than to the four prior up weeks. Accept foregone upside; the cost of an unwanted forced cut at the 96th percentile outweighs it.
What would change it
If eight-hour funding falls back towards its 0.01% floor and ETH's weekly gains shrink towards the prior weeks' 0.64% to 13.80% band, the crowding argument weakens and size can be raised against a re-anchored limit. If single-hour moves exceed 2.17% repeatedly, tighten the limit further.
What sets this case apart
This case is about a loss-limit rule meeting an asset at its own upside extreme, not about forecasting a reversal.