Will GPC's NAPA US Automotive comparable sales be positive in Q3 2026?

Conditional probability framing: P(Q3+ | Q2+) ≈ 0.72 (continued momentum + easier Q3 2025 comp), P(Q3+ | Q2-) ≈ 0.28 (seasonality alone unlikely to flip a confirmed reversal). P(Q2+) ≈ 0.65 based on broad-based Q1 evidence (independent +1%, sell-through +4%, company-owned +5.5%) and management corroboration. Marginal: 0.65 x 0.72 + 0.35 x 0.28 = 0.468 + 0.098 = 0.566. Round modestly higher to ~0.62 to acknowledge that Q3's easier 2025 comp base is itself a structural lift independent of Q2 outcome. 0.62.

Tail consideration: AZO and ORLY have continued to outpace NAPA's growth rate, suggesting an underlying competitive share dynamic that the cyclical narrative doesn't fully address. If pure-play peers are +6-7% comps, NAPA at +1% is still losing share — and a secular share-loss trend can override cyclical recovery in any given quarter. Iran-driven fuel price pressure on miles-driven adds a demand-side counterweight by Q3. Q1's +1% independent comp is fragile evidence; restocking benefit fades. Modestly below 60. 0.58.

The Q1 evidence base is broader than just independent owners: NAPA US segment posted positive comp at the segment level, with company-owned stores comping +5.5% and sell-through running +4%. This is not a single-data-point swing — it's three corroborating channel signals all pointing positive. Easier Q3 2025 comp base (FY2025 weakness was H2-weighted). Three consecutive PMI readings >50 signal industrial-side recovery that often correlates with auto aftermarket. Modestly above 60. 0.65.

Q1 inflection broad; Q3 2025 comp base easier. Conditional probability framing yields ~0.55-0.60 marginal; modest upward adjustment for the structural lift from easier comps. 0.62.

Q1 +1% independent inflection is real but management explicitly flagged Q2 confirmation as decisive. Single-quarter data not yet trend. Risk that restocking-driven Q1 lift fades by Q3 as channel inventory normalizes. 0.60.

Easier Q3 2025 comp base + management 2026 guide assumes US Automotive normalization + 71-year track record of operating through cycles + Q1 corroborating channel signals. Marginal lean YES. 0.63.

Q1 segment comp positive; Q3 2025 base easier; restocking lift may fade. Modest lean YES. 0.61.

Two confirmation prints needed (Q2 then Q3); each adds uncertainty. Iran fuel pressure modest drag. 0.58.

Q1 broad-based positive + easier Q3 2025 comp + management normalization guide. Lean YES. 0.63.