Booking Holdings’ Stealth B2B Surge: Challenging Expedia’s Long-Standing Dominance in the Partner Market.

For more than a decade, the narrative surrounding the global online travel agency (OTA) landscape has been defined by a relatively stable dichotomy: Booking Holdings was the undisputed king of the direct-to-consumer (B2C) hotel business, particularly in Europe, while Expedia Group held the crown for the business-to-business (B2B) and partner distribution segment. This division of labor allowed both giants to flourish in their respective strongholds. However, a seismic shift is occurring beneath the surface of financial disclosures. Recent analytical data suggests that Booking Holdings has not only entered the B2B arena with force but may have already overtaken Expedia in terms of sheer volume, fundamentally altering the competitive dynamics of the $2 trillion global travel industry.

The travel industry has long viewed Expedia’s B2B arm—Expedia Partner Solutions (EPS)—as the gold standard for third-party distribution. By providing the technological "pipes" and inventory for banks, airlines, and offline travel agencies to sell hotel rooms and flights, Expedia built a massive, high-margin revenue stream that insulated it from the volatility of direct consumer marketing. Yet, a new research note from BTIG analyst Jake Fuller has sent shockwaves through the sector by suggesting that the consensus view is outdated. According to Fuller’s estimates, Booking Holdings’ B2B business processed approximately 196 million room nights over the past 12 months. This figure represents a staggering 15% lead over the roughly 170 million room nights booked through Expedia’s vaunted partner business during the same period.

The reason this revelation comes as a surprise to many industry observers is rooted in the divergent disclosure strategies of the two companies. Expedia Group has been increasingly transparent about its B2B performance, recently highlighting it as a primary engine of growth. In the second quarter of the current fiscal year, Expedia’s B2B segment saw revenue jump 23% to $1.5 billion. This stood in stark contrast to its consumer-facing brands—including Expedia.com, Hotels.com, and Vrbo—which saw a more modest growth rate of 8%, totaling $2.7 billion. By breaking out these figures, Expedia has successfully marketed itself to Wall Street as a diversified technology platform rather than just a collection of booking websites.

Booking Holdings, conversely, has maintained a "stealth" approach. The Norwalk, Connecticut-based company does not provide a specific line item for B2B revenue or room nights in its quarterly earnings reports. This lack of transparency led many to assume that its B2B operations were a secondary, perhaps even negligible, part of the business. Fuller’s analysis challenges this assumption, arguing that the lack of disclosure has masked a massive scale-up. The BTIG report suggests that Booking’s B2B growth has been fueled by a multi-year strategic pivot that involved moving away from its traditional "agency" model toward a "merchant" model, which is a prerequisite for robust B2B distribution.

To understand how Booking Holdings achieved this growth, one must look at the structural evolution of its business model. For most of its history, Booking.com operated on an agency model where the guest paid the hotel directly upon arrival, and the hotel paid a commission to Booking. While this was highly efficient for consumer bookings, it was difficult to scale in a B2B context where partners (like a bank’s loyalty portal) need to collect payment from the customer upfront. Over the last five years, under the leadership of CEO Glenn Fogel, Booking Holdings has aggressively expanded its merchant business, where it handles the payment processing itself. This transition was the "key" that unlocked the B2B door, allowing Booking to distribute its massive inventory of over 2.7 million properties to third-party partners who require pre-paid booking capabilities.

Furthermore, Booking Holdings has leveraged its subsidiary, Agoda, which has long had a more sophisticated B2B and merchant-focused infrastructure in the Asia-Pacific region. By integrating Agoda’s backend capabilities with Booking.com’s global inventory, the parent company created a formidable distribution engine. This engine now powers the travel portals of major airlines, financial institutions, and even smaller, regional OTAs that lack the resources to source their own global hotel supply.

The implications of Booking Holdings’ B2B dominance extend far beyond bragging rights. In the modern travel economy, the cost of acquiring a customer through traditional channels—namely Google Search and Meta (Facebook/Instagram)—has reached record highs. The "Google Tax," as it is often called in the industry, eats significantly into the margins of B2C bookings. B2B partnerships offer a strategic escape from this cycle. When a customer books a hotel through their Chase or American Express credit card portal, or through an airline’s vacation package website, the OTA (Booking or Expedia) does not have to pay Google for that click. While the OTA must share a portion of the commission with the partner, the overall customer acquisition cost (CAC) is often lower and the volume is more predictable.

This shift toward B2B is also a central pillar of Glenn Fogel’s "Connected Trip" vision. The goal is to create a seamless ecosystem where a traveler can book their flight, hotel, rental car, and local attractions in a single transaction. By expanding its B2B footprint, Booking Holdings ensures that its inventory is present at every possible digital touchpoint where a traveler might begin their journey. Whether the consumer starts at a bank’s loyalty app or a specialized niche travel site, Booking Holdings wants to be the invisible infrastructure powering the transaction.

However, Expedia is not standing still. Under its own reorganization efforts, Expedia has consolidated its tech stack into a single platform, aiming to make its B2B offerings even more "plug-and-play" for partners. Expedia’s long-term relationships with massive entities like Walmart and various international airlines give it a "moat" of high-value, exclusive audiences. The battle for B2B supremacy is essentially a battle for the "pipes" of the travel industry. If Fuller’s estimates are correct, Booking Holdings has successfully parlayed its B2C scale into a B2B advantage, using its massive supply of alternative accommodations and hotels to lure partners away from the traditional Expedia ecosystem.

From a competitive standpoint, the growth of these two giants in the B2B space creates a challenging environment for smaller players and traditional global distribution systems (GDS) like Amadeus and Sabre. As Booking and Expedia become more adept at distributing inventory to third parties, they are increasingly acting as wholesalers. This puts pressure on traditional bedbanks and wholesalers who have historically occupied the space between hotels and travel agents.

The BTIG report also highlights a potential "revaluation" opportunity for Booking Holdings. If investors begin to view Booking not just as a consumer website but as a dominant B2B infrastructure provider, the company may command a different valuation multiple. The market typically rewards B2B revenue for its "stickiness" and lower marketing sensitivity. If Booking were to follow Expedia’s lead and begin disclosing B2B financials, it could reveal a business unit that is growing faster and perhaps more profitably than its core consumer brand.

Despite the optimistic outlook for Booking’s B2B growth, there are risks associated with this expansion. Relying on third-party partners means relinquishing control over the user experience and the brand relationship. When a booking goes wrong on a partner site, the consumer often blames the partner, but the operational burden of fixing the issue falls on the inventory provider. Additionally, the B2B market is becoming increasingly crowded, with newer entrants like Hopper and various travel-fintech startups vying for the same "loyalty and banking" partnerships that have fueled Expedia and Booking’s growth.

The reorganization currently underway at Booking Holdings—aimed at streamlining operations across its various brands like Booking.com, Priceline, and Agoda—is likely designed to further capitalize on this B2B momentum. By centralizing its partner services, Booking can offer a unified API (Application Programming Interface) that gives partners access to everything from boutique hotels in Europe to homes and apartments in the U.S. and flights globally.

As the travel industry moves into the final quarters of the year, all eyes will be on the "Merchant" revenue lines of these two companies. While the room night counts estimated by BTIG provide a compelling snapshot, the ultimate measure of success will be the ability to maintain margins in an increasingly commoditized distribution environment. For now, the "stealth" giant has been unmasked. Booking Holdings is no longer just a destination for travelers; it has become the backbone of the travel industry’s global supply chain, challenging the very definition of what an online travel agency is supposed to be. The rivalry between Expedia and Booking has entered a new, more complex phase where the most important transactions are the ones the average consumer never even realizes are happening.