A new factor joins the XTech Flow Factor Library, built on our proprietary investor-flow dataset. It trades the S&P Select Sector SPDRs and holds positions for roughly three months — 26.2% annualized in the beta-matched construction against SPY's 16.3%, net of modeled costs.
Most of what makes a factor interesting on paper gets destroyed on the way to a live book. The universe is too wide, the borrow is scarce, the signal decays before the fill, or the turnover eats the edge. A factor that looks superb in a research note and cannot be run at size is a research note.
Sector Flow Reversion was built the other way round. It is a systematic sector strategy driven by XTech investor-flow analytics, and every implementation decision in it was made in favour of something a client can actually put on.
What it trades
Eleven instruments: the S&P Select Sector SPDRs.
Among the most liquid vehicles in the US market, no borrow scarcity, no capacity cliff, no single-name blow-up risk to carry.
Positions are held, on a turnover-implied basis, for an average of 64.4 trading days — roughly a quarter. Annualized turnover runs at 6.20×, measured as half traded notional against NAV.
The factor is published in two constructions from the same underlying sector weights: a market-neutral book, and a beta-matched book that layers the same sector positions on top of full market exposure.
The backtest
Three things are worth pulling out of that table.
The beta-matched book compounds $1 into $5.74 over the period against SPY's $3.11, at 19.2% volatility versus the benchmark's 18.5% — an extra ten points of annualized return for essentially the same ride.
The market-neutral column is the one allocators will look at twice.
A realized beta of −0.03 across seven and a half years, at 7.0% annualized volatility, is roughly a third of SPY's volatility with no directional market exposure. Whatever the book is earning, it is not earning it from equity beta.
And then the cost line.
Annualized modeled costs of 0.64% and 0.84% are what the implementation choices buy you.
Costs are modeled at 5 bps on half-turnover — 2.5 bps of total absolute traded notional — plus 40 bps annualized borrow on short notional and prior-published SOFR + 50 bps on cash debit, accrued ACT/360, with no credit for surplus cash.
Turnover at that level, in instruments that trade in pennies, leaves the edge substantially intact. That is a different property from having an edge at all.
Easy to put to work
Quantitative investors
Eleven tickers, a three-month holding period and a published cost model make this a factor a team can reproduce and stress on their own infrastructure without a build.
It is a fast way to get flow analytics in front of an investment committee with numbers attached.
Discretionary and wealth managers
A sector-level signal on a three-month horizon maps onto how allocation decisions already get made.
The natural delivery here is not a factor column at all — it is a dashboard showing which sectors are currently most over- and under-weighted on flow, refreshed daily. We build those.
Where it sits in the library
In July we introduced two factors in the library: Institutional Participation Share and Retail Participation Share, which score participant crowding on the Russell 2000 and the large-cap liquid universe respectively. Both are single-name factors scored across a wide universe.
Sector Flow Reversion is a different instrument entirely — eleven ETFs instead of hundreds of names, quarterly-scale holds instead of daily and ten-day horizons. For most firms it is the simplest of the three to stand up.
See it live — this Thursday in New York
The full research — qualified investors only
We do not publish the construction. The methodology, the research note behind it — Flow-Conditioned Sector Reversal, 8 September 2026 — and the daily ledgers underneath these figures are released to qualified institutional investors only, one to one with the research team. They are not distributed publicly.
Access is subject to eligibility verification. If you want to see how this is built, that is the conversation to have: contact sales@exponential-tech.ai for the brochure, a research walkthrough, or a trial of the Flow Factor Library.
For institutional information only. Not investment advice and not an offer to transact. Source: Exponential Technology, "Flow-Conditioned Sector Reversal," 8 September 2026, and underlying daily ledgers. Hypothetical historical reconstruction; simulated results are not actual trading results.
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