RabbitSuit Fund
A Bitcoin fund we run with our own money, reported in the open. We do it for our own discipline, and for anyone curious; none of it is investment advice.
The goal: returns like holding Bitcoin, with much smaller falls along the way. We judge that on Sharpe and MAR, the risk-adjusted scores. Why Bitcoin →
One rule sets the mix each day: it decides how much of the fund is in Bitcoin, anywhere from 0% to 100%. When the dial reads 0.65, 65% of the fund is in Bitcoin. The rest is parked in one other asset.
That other asset is one of cash (money market), world stocks, gold, the Nasdaq-100 or long US Treasuries, re-picked at each month-end by a rule. Switching it never changes the Bitcoin share.
On top, a small options position buys convexity when our strategy says it is worth it. It can only lose what it paid, and it never changes the Bitcoin share.
In the 2018–2026 backtest, the headline window: CAGR 88%, worst drawdown -29%, Sharpe 1.85, MAR 3.02. Simulated: no fund existed then. The backtest → Includes the options position from Jul 3, 2020, when its price data begin.
Live since Aug 3, 2026 (57 days), the USD · spot model fund: +19.8%, against +30.8% for holding Bitcoin. Too short to annualize. All four funds →
rest parked in the Nasdaq-100
daily close 2026-09-27
The model funds, live
live record · simulated tradesValue since launch, with a cost charged on each simulated trade. The faint line is holding Bitcoin. Yearly figures appear once a fund is 90 days old.
Where to look
How the four model funds are doing: value, returns and benchmarks at each daily close.
Today's dial, the split it implies, where the rest is parked, and any open options.
Bitcoin and the parking assets: what each one is and how it has moved.
Today's rules replayed over the past, from any start date.
Latest journal
all entries →One change to how the options position is funded. An options position that expires on the same day a new one would be bought still counts as money tied up when the fund checks whether the parked share can pay for the new one. Its proceeds are not used to pay for a purchase on the same day, because in the account the fund uses they are not reliably available that soon. The practical effect is that, when Bitcoin already takes up most of the fund, a new options purchase is skipped a little more often. In the historical record this skips three purchases in early 2023 and lowers the simulated return with options slightly; the figures without options do not change. The rule for when to buy, the sizes and the cap are as they were. It moves no position today and changes nothing the fund holds.
Reporting change; no rule changes. Two things. First, the fund now publishes two reference dials beside the one it follows: the dial as it would read under the rule in force before the last change, and the dial with only the four-year-average exception and no read-ahead. They are yardsticks: nothing is bought or sold on them. The read-ahead will be judged against the second one, the simpler rule it has to beat, and the yearly review reports both. Second, the wording. The read-ahead is a momentum adjustment on the fund's liquidity reading, chosen because it improved the historical record. The observation that Bitcoin tends to follow liquidity with a lag of a few months is what prompted it; the adjustment is not calculated from that lag, and earlier wording that suggested so has been corrected. Every rule, band, cap and figure the fund runs on is exactly as it was and nothing trades differently.
Two bounded changes to how the dial reads liquidity. First, when global liquidity has improved over the last three months, part of that improvement is read ahead. This is a momentum adjustment chosen from the historical record; the observation that Bitcoin tends to follow liquidity with a lag of a few months is what prompted it, not a formula it follows from. A deterioration is read as before, so the dial is never below what the old rule would say. Second, while Bitcoin's price closes below its four-year average, the liquidity haircut is not applied: at those levels the record shows the haircut costs the recovery more than it saves, and it comes back the day price closes above the average. Nothing else moves: the valuation and rotation factors, the executed dial's memory, the floor, the bands, the parking rule, the options position and every override are as they were. The rule was re-backtested over the full history before adoption and judged on return per unit of drawdown; it improves the record on every window and passes the after-tax check. It is not free of cost: in the past it would have held a material Bitcoin position through the November 2022 exchange collapse, which cost about twelve percent of the fund's value in a fortnight before the 2023 recovery more than repaid it. It makes no trade today: at the current close the new and old readings are the same number.
The fund now accounts for when Federal Reserve balance-sheet information becomes available. Historical simulations also use earlier information for the valuation reference and include ETF distributions consistently. Actual past decisions remain the fund's record. The allocation effect was checked against the production state; future rebalances follow the existing execution rules.