Median Shopping impr. share

Competitive Landscape: Macro-Trend Analysis

Legacy Dominance vs. Challenger Momentum

• Amazon’s Unshaken Lead: Despite aggressive market disruption, Amazon maintains historical dominance, consistently capturing 30-40% median impression share. The sharp drop in Summer 2025—a deliberate algorithmic experiment—proves their baseline strength. Upon return, Amazon immediately reclaimed peak auction volume, surging during Q4 2025.
• The Temu Plateau: Temu’s rapid push initially challenged legacy assumptions, peaking near 27% during Amazon’s summer absence. However, their momentum plateaued in early 2026, softening to 18-20%. This indicates a ceiling to “buying” market share via aggressive, venture-backed ad spend.

Divergent Bidding Strategies

• Static vs. Dynamic: eBay exhibits a remarkably flat trajectory (~18%), indicating a mature, highly constrained ROI-driven bidding model. Conversely, Amazon’s volatile peaks reflect dynamic, seasonal aggressiveness, capitalizing heavily on Q4 holiday intent.
• Low-Cost Consolidation: AliExpress maintains a steady, lower-tier share (15-18%). While low-cost challengers (Temu, AliExpress) capture significant auction space driven by cross-border shipping pushes and consumer price sensitivity, they largely cannibalize each other rather than permanently eroding Amazon’s core share.

Market Forces & Auction Dynamics

• Who is ‘Buying’ the Market? Temu’s sustained presence confirms massive capital deployment to force auction entry. Yet, Amazon’s rapid recovery post-experiment and sustained Q4 dominance highlight that legacy algorithmic maturity and conversion-rate superiority ultimately dictate Shopping auction hierarchy. Low-cost disruptors can buy visibility, but they have not achieved true market inversion.