A 52.37% week, the best of 44, tests a fixed crypto sleeve after four straight down weeks
Should the allocator raise the crypto sleeve's share after ETH's best week in its 44 weeks of history, or keep the sleeve fixed and treat the rebound as part of a downtrend that is still 88.87% below its 52-week high?
The market facts are real; the decision maker is illustrative.
The week and the position
In the week of 17 December 2018, ETH rose 52.37%, from 84.68 to 129.03, with a 15.52% gain on Thursday 20 December and a close in the upper third of the week range (93.9%). Volume was 1.44 times its prior 12-week average, and the move ranked at the 100th percentile against 44 weeks of history. The four prior weeks were all down (-33.72%, -1.75%, -20.04%, -9.21%), ETH still sits 88.87% below its 52-week high, and it outperformed BTC by 30.68 percentage points. An illustrative allocator runs a small fixed crypto sleeve inside a larger fund.
Judgment
A week at the 100th percentile after four down weeks is evidence of a reversal in progress, not proof that the sleeve's size was set wrong. Keep the sleeve at its fixed share and let the rebound raise its weight back towards target rather than adding to it on the strongest week in 44. Realise that the sleeve's weight has already grown materially and accept the chance of giving back part of the gain if the downtrend resumes from 88.87% below the high.
What would change it
If a subsequent week closes above this week's high of 131.94 on volume above the 12-week average, the case for treating this as a downtrend rebound weakens and a larger sleeve can be considered. If the next week closes below this week's open of 84.68, revert to the fixed share without adding.
What sets this case apart
The decision is about rebalancing discipline when an extreme-percentile rebound lifts a sleeve inside a fixed-weight mandate, not about the direction of the asset.