Booking Holdings spent $8.186 billion on marketing in 2025, up 12.5%, with the substantial majority flowing to Google. The same 10-K discloses AI trip planners, AI assistants, and an AI price comparison tool shipped into the product.
Booking.com is the most-visited travel website in the world. $23.7B revenue, 400M+ monthly visits, 19.6% Q1 2026 margin. What its marketing operating system actually does — and how the AI rebuild is reshaping it.
Booking.com is the canonical case in search engine marketing at industrial scale. $5–7B annual paid search spend — the largest of any consumer brand. 1,000+ simultaneous A/B experiments. Category-level paid-search dominance in over 200 countries. The unit economics gate the model.
Google Discovery Ads have been gaining substantial digital marketing team adoption. The cross-surface delivery across YouTube, Discover, and Gmail, the native creative format, the Smart Bidding integration, and how Discovery Ads compare to other Google ad formats and the broader competitive landscape.
Google Ads $200B+. Meta $135B+. Amazon Advertising $50B+. TikTok toward $20B+. The 2026 paid digital advertising economy — and the reputation lesson from the 2012 Bruce Clay case.