Will the Manheim Used Vehicle Value Index post a >3% sequential monthly decline in any month from April through July 2026?

This is a 4-trial question against a recent positive observation: the Oct-Nov 2025 Manheim drop was -4.3% MoM, empirically proving >3% sequential declines are not tail events. Base rate approach: if monthly >3% declines occur roughly once per six-month window, P(at least one in 4 months) = 1 - (5/6)^4 ~= 0.52. Adjust modestly downward for April-May tax-refund seasonal strength (management's 'orderly, seasonal strength building into tax refund season' framing explicitly calls this out). June-July are seasonally weaker and are the higher-risk trials. Tariff regime resolution and used-EV residual repricing are wildcards that increase variance rather than mean.

The committee explicitly flagged that April-May tax-refund season is historically a Manheim STRENGTH window (Q3 2025 call: 'bump during the April tax refund season and values have remained relatively stable since'). Management's January 2026 framing reinforces this. That makes April and May readings structurally less likely to print <-3%. The risk concentrates in June-July, which is effectively a 2-trial question in the unfavorable seasonal window. If per-month probability there is ~15-20%, P(at least one) = 1 - 0.8^2 to 1 - 0.85^2 = 0.28-0.36. Adding back small April/May decline risk gives ~0.40-0.45. Tariff reversion risk nudges the estimate up slightly.

Two committee findings push probability above coin-flip. First, the Oct-Nov 2025 -4.3% drop is recent and unambiguous empirical precedent within the same data-generating process. Second, the committee flags tariff-supported 2025 residuals as a specific mean-reversion risk for 2026, and used-EV residual repricing as a separate pressure. The Myth Meter position (Manheim path already priced into the $325 FY26 DPU guide) does NOT change the Manheim probability itself, only its downstream CAR impact. The seasonal strength argument is real but partial: a >3% MoM decline can happen even during seasonally firm periods if supply/tariff dynamics dominate. Across 4 independent monthly readings, at least one tail move is more likely than not.

Split the window into two regimes. April-May: tax refund season, explicitly a seasonal strength window per the Q3 2025 call, management framing positive, per-month P(>3% decline) likely 8-12%. June-July: seasonally softer, per-month P(>3% decline) likely 15-20% absent shocks. Combined: P(at least one) ~= 1 - 0.9*0.9*0.82*0.82 ~= 0.46. The -4.3% Oct-Nov move provides base rate calibration but happened in a seasonally weak month, not April-May. Slightly below coin-flip reflecting that seasonality is doing real work in two of the four trials.

Committee found that the Manheim -> DPU -> ABS OC chain is the load-bearing risk across 4 lenses, and explicitly noted that a >3% decline has ALREADY occurred in the recent window. That is a strong prior for 'this can happen.' The counter-argument is April-May seasonal strength, but the committee also flagged that management's positive framing is directional, not predictive. With 4 monthly trials, tariff reversion and used-EV residual pressure as identified risks, and one recent empirical precedent, this is genuinely a coin flip. I decline to anchor away from 50% when the committee itself flagged the index time series as a CRITICAL DATA GAP.

The seasonal case is stronger than the bearish case in my read. Both Q3 and Q4 2025 management calls characterize Manheim as resilient through tax refund season, and the 2024 historical pattern confirms April refund bump + subsequent stability. The Oct-Nov 2025 drop, while recent, happened in a structurally different part of the seasonal cycle and was tied to tariff shock unwinding, which has largely passed through. That leaves June-July as the principal risk window, and even those months don't have a specific catalyst in the committee's analysis. Per-month decline probabilities of 8%, 10%, 14%, 15% compound to 1 - 0.92*0.90*0.86*0.85 ~= 0.39.

Recent -4.3% Oct-Nov 2025 drop proves >3% declines are non-tail events. Four monthly trials increase cumulative probability versus single-month base rate. But April-May is historically a strength window per Q3 2025 call. Net: slightly below coin-flip.

Management's 'orderly, seasonal strength' framing plus explicit 2024 historical pattern of April bump + stability argue for firm readings. The Oct-Nov 2025 drop was tariff-related and likely one-off within the current regime. Weight the seasonal case more heavily than the recent precedent.

Committee flagged Manheim time series as a CRITICAL DATA GAP. Without the full series, confidence is low and anchoring at the base-rate coin flip is appropriate. Recent -4.3% drop + 4 trials + identified tariff/EV risks balance against April-May seasonal strength.