Turtle Trading: original versus futures-realistic mechanics

This is a comparative research note, not a single-strategy model card. It may compare multiple variants and does not carry a single PASS/FAIL verdict badge.

Generated: 2026-09-12T08:08:23+00:00

Generated: 2026-09-12T08:08:23+00:00

Outcome

MARGIN CALL TRIGGERED on 2010-02-08. The account was forced flat and no later entry or pyramid signal was allowed.

This is the same Turtle signal, sizing, pyramiding, stop, and portfolio-cap logic in both columns. Only transaction cost and the explicit maintenance-margin circuit breaker differ. The shared vectorized backtest engine is unchanged.

Common sample: 2010-01-04 to 2026-09-10 (4196 sessions)
Original: 5.0 bps per unit of notional turnover; no margin call
Futures-realistic: 0.5 bps per unit of notional turnover; liquidate and permanently halt when equity is at or below 10% of gross notional
Execution remains LazyAlpha's close-derived, one-session-lagged weight convention

Why these mechanics

LazyAlpha's return calculation already has the relevant economic equivalence: a portfolio weight times an ETF return produces the same percentage account P&L as the same notional futures exposure times the underlying return. No futures-specific return formula was added.

The original 5 bps charge was an ETF-style assumption applied to notional turnover. For scale, CME defines ES as $50 times the S&P 500 index; at an index level near 6,500 that is about $325,000 notional. Published all-in ES round-turn examples are roughly $4-$5 (Topstep lists $3.78), equal to approximately 0.12-0.15 bps of a $325,000 notional. The experiment uses 0.5 bps, deliberately about three to four times that illustrative rate and therefore not a cheapest-case choice.

Sources: CME ES contract multiplier and margin estimate; Topstep ES round-turn fees.

CME explains that falling below maintenance margin requires restoring the account, and Schwab states that futures margin is generally 3%-12% of notional. The fixed 10% threshold is a conservative point near the upper end of that published range, appropriate for a heterogeneous multi-asset proxy universe. It was selected from real-world convention, not tuned against this backtest. This simplified experiment liquidates fully and halts permanently instead of assuming fresh capital is wired in.

Sources: CME performance-bond and maintenance-margin FAQ; Schwab futures-margin overview.

Full-sample metrics

Metric	Original: 5 bps, no margin call	Futures: 0.5 bps, 10% margin call
Gross cumulative return	-18.47%	2.38%
Net cumulative return	-98.82%	2.27%
CAGR	-23.39%	0.13%
Annualized volatility	116.79%	0.43%
Annualized Sharpe (rf=0)	0.37	0.32
Maximum drawdown	-99.94%	-0.06%
Annualized turnover	50592.57%	133.37%
Transaction-cost drag (sum daily rates)	421.20%	0.11%

Leverage, liquidation, and accounting checks

Original peak / average gross leverage: 40.5299x / 14.0696x
Futures-realistic peak / average gross leverage: 11.0902x / 0.0042x
Margin-call date: 2010-02-08
Equity at check: $1,023,284.87
Gross notional at check: $11,144,205.45
Equity / gross notional: 9.1822%
Action: every market forced flat; all entries halted for the rest of the sample
Original internal/backtester maximum absolute equity difference: 1.68802216649e-09
Futures internal/backtester maximum absolute equity difference: 1.16415321827e-10
Required reconciliation tolerance: 0.0001; both passed

The margin test occurs after that day's mark-to-market and modeled turnover cost, before stops, exits, or new entries. Gross notional is the sum of absolute current unit notionals at that close. Forced-flat weights use the existing execution convention, so liquidation turnover is charged by the unchanged engine on the next session. Once called, the strategy emits zero weights permanently.

Walk-forward metrics

Each chronological window starts an independent account with the same frozen parameters; the development/OOS split is identical for both variants.

Metric	Original development	Futures development	Original OOS	Futures OOS
Gross cumulative return	-84.83%	2.38%	115.26%	0.41%
Net cumulative return	-98.92%	2.27%	-55.20%	0.30%
CAGR	-36.48%	0.23%	-11.35%	0.04%
Annualized volatility	111.62%	0.55%	122.86%	0.94%
Annualized Sharpe (rf=0)	0.16	0.41	0.54	0.05
Maximum drawdown	-99.91%	-0.06%	-98.06%	-1.86%
Annualized turnover	52754.32%	222.33%	46810.57%	327.95%
Transaction-cost drag (sum daily rates)	263.46%	0.11%	155.94%	0.11%

Development window: 2010-01-04 to 2020-01-02 (2517 sessions)
OOS window: 2020-01-03 to 2026-09-10 (1679 sessions)
Original verdict: FAIL: degrades out of sample; the frozen strategy trails the benchmark on return or Sharpe in at least one OOS window.
Futures-realistic verdict: FAIL: degrades out of sample; the frozen strategy trails the benchmark on return or Sharpe in at least one OOS window.

Interpretation

The lower futures-style transaction cost does not make the strategy viable under this maintenance rule: it breaches the threshold and is liquidated. Notably, full-sample equity was still above its $1,000,000 start at the call; the breach came from gross exposure reaching 11.09x and pushing equity/gross below 10%, not from the account first suffering a catastrophic loss. This is an inherent sizing/leverage failure under the chosen real-world constraint. Results after that date are flat-account results, not silent continued compounding.

The original net return is -98.82% versus 2.27% for the futures-realistic variant. This comparison separates the effect of transaction-cost convention and forced liquidation, but it does not model contract granularity, rolls, term structure, financing/collateral yield, intraday margin checks, exchange-specific portfolio offsets, slippage, or market impact.

Data provenance

Source: market-data-hub (adj_close; live rows included: False)
Symbols: SPY, QQQ, IWM, TLT, IEF, GLD, SLV, DBC, USO, UUP
Common panel: 2010-01-04 to 2026-09-10; 4196 rows
Database: market-data-hub configured default

This is historical research, not a claim of tradability or an investment recommendation.