Legacy Dominance vs. Challenger Momentum
- Amazon’s Market Control: Amazon maintains historical dominance (30-40% baseline), dictating overall auction pacing. Excluding their deliberate summer 2025 auction experiment, Amazon’s trajectory shows massive seasonal elasticity, peaking aggressively during Q4 2025 to capture holiday demand.
- Temu’s Aggressive Acquisition: Temu has firmly established itself as the definitive #2, consistently holding 20-25% share. Crucially, Temu rapidly absorbed the auction vacuum during Amazon’s summer pullback, peaking at ~27%. This proves their algorithmic readiness to instantly capture available top-of-page inventory.
- Secondary Player Stagnation: Legacy player eBay (~18%) and low-cost challenger AliExpress (~16%) exhibit flat, non-volatile trajectories. They lack the momentum of Temu, indicating a defensive posture.
External Market Drivers
- Capital Deployment: Temu’s sustained high impression share reflects aggressive, venture-backed ad spend designed to buy Western market share and exploit shifting consumer price sensitivity.
- Seasonal Q4 Flexing: Amazon’s sharp spike in late Q4 demonstrates unmatched capital deployment during high-conversion retail periods, which directly suppressed Temu’s share (dropping below 20% in November).
Competitor Divergence & Auction Strategy
The Shopping auction reveals a heavily bifurcated landscape:
- The Market Makers (Amazon & Temu): These two are actively fighting for top-of-page dominance. Their inverse relationship—especially visible when Temu dips as Amazon surges in Q4—highlights a direct, zero-sum battle for high-intent queries.
- The Efficiency Seekers (eBay & AliExpress): Both players show minimal reaction to broader market volatility. Their flatlines suggest rigid bid caps, strict ROAS targets, and a strategic refusal to engage in expensive impression-share bidding wars.
Conclusion
The data confirms a functional duopoly in aggressive Shopping auction participation. While Amazon retains the crown through seasonal dominance, Temu is successfully “buying” the market, relegating eBay and AliExpress to a passive, efficiency-driven tier.