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Next filing · Form 10-Q · Q2 2026 · 54 daysFactor Research · Part 2 published: risk structure in 13F filings across five allocator stylesAPI Update · AOM portfolio chains — single snapshot call for multi-step analyze flowsAPI Update · POST /api/snapshot — canonical JSON portfolio snapshotPart 3 · The One Manager Skill That PersistsPart 1 · One Position, Four BetsNext filing · Form 10-Q · Q2 2026 · 54 daysFactor Research · Part 2 published: risk structure in 13F filings across five allocator stylesAPI Update · AOM portfolio chains — single snapshot call for multi-step analyze flowsAPI Update · POST /api/snapshot — canonical JSON portfolio snapshotPart 3 · The One Manager Skill That PersistsPart 1 · One Position, Four Bets
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Concept · Point-in-time data discipline

Look-ahead bias

Letting a backtest see information that wasn't yet public on the simulated date. The most common research bug.

In depth

Letting a simulation use information that wasn't public on the simulated date — the most common research bug. Filing lags are the usual culprit: a fund's holdings aren't knowable until ~45–60 days after the report date.

Referenced by (2)

  • Beyond Active Share

    A within-mandate manager-efficiency framework using ERM3 residual decomposition

  • The Industry Beneath the Index

    Vasicek peer-β cross-sections expose what sector ETFs paper over

Related concepts

Point-in-time (PIT)Filing lagSurvivorship bias
← Point-in-time (PIT)Point-in-time data discipline · 2 / 4Filing lag →
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