A fifth up week with an 8.56% down day inside it tests a weekly rebalance
Should the fund carry its ETH long at full trend size into a fifth up week, or rebalance down to a volatility-scaled size that accepts giving up part of a rally still 23.3% below the 52-week high?
The market facts are real; the decision maker is illustrative.
The week and the position
In the week of 17 February 2020, ETH rose 6.02% to 274.48, a fifth consecutive up week after four prior up weeks, and a 72.0 return percentile against 105 weeks of history, yet it fell 8.56% on Wednesday after a 5.49% best day on Tuesday and a -4.49% hour at 21:00 UTC. Realised volatility ran at 91.6% annualised, the range was 18.13%, dollar volume was 2.74 times the prior 12-week average, and funding averaged 0.0518% per eight hours. The close sat in the upper third of the range.
Judgment
The trend is intact, so the long stays, but size it from realised volatility rather than conviction. The four prior weeks were all up, volume ran 2.74 times the prior 12-week average, and funding averaged 0.0518% per eight hours; Wednesday's 8.56% day is what a weekly rebalance has to survive between fixes. Rebalance to a volatility-scaled target and accept the cost of holding less if the rally continues; the alternative is meeting the next such day at full size with no way to act until the following week.
What would change it
If a weekly close falls below the week's low of 242.00, or two consecutive weeks close below the 258.89 open, the trend call is withdrawn and the long is cut regardless of size. If realised volatility falls back for several weeks, the size limit can be relaxed.
What sets this case apart
The tension is sizing, not direction: a rising market where one down day exceeds the whole week's net gain, fixed to a weekly clock.