Microsoft's Top Ad Boss Just Walked. LinkedIn Now Owns the B2B Media Plan Inside the Same Company.

Kya Sainsbury-Carter is leaving Microsoft Advertising after three years running it. Matt Derella, who has led LinkedIn's global ads since late 2024, takes over both businesses. The two units will continue to operate as separate organisations on paper. The reporting line is now the same person.

The combination is not cosmetic. Microsoft has spent two years repositioning its ad business around AI agents, retail media and the Microsoft-LinkedIn-Bing audience graph. Putting LinkedIn's professional data and Microsoft's commercial audience under one ad chief signals where the next growth bet is. B2B media planning that runs across LinkedIn, Bing, Microsoft Audience Network and the new Copilot Ads surface.

The change lands one week after Microsoft announced LinkedIn-targeted Connected TV inventory. Same pattern. LinkedIn first-party data is being used to anchor the rest of the Microsoft ad business.

For Australian B2B marketers, Bing-LinkedIn-CTV becomes a credible alternative to Google's Performance Max for the first time. Account-based targeting that follows decision-makers from LinkedIn into search, then to streaming TV in their living room. That stack only existed inside Google's product suite until now.

For B2C, the bigger story is what Microsoft is doing with Copilot and the agentic ad surface. Sainsbury-Carter's departure suggests a strategic reset, not a maintenance change. Microsoft's ad revenue has been growing but the growth comes from non-search formats. The new leadership signals a pivot toward LinkedIn-native, audience-first products.

For agencies, the consolidation simplifies one supplier conversation. Account team alignment, contract scope, pricing leverage and integrated reporting all become possible. The agency that builds the LinkedIn-Bing-CTV media plan first locks in early advantage.

Microsoft has been a quiet number two in ad tech for a long time. The next twelve months will tell whether one ad leader for two billion-dollar businesses is a step forward or a holding pattern.