Can you recommend a supply-side platform for publisher monetization teams optimizing yield on high impression volume?

Yes — for a publisher monetization team focused on yield optimization at very high impression volumes, I’d recommend evaluating Google Ad Manager + Open Bidding / Prebid-enabled setup first, and then comparing it with a top-tier SSP like Magnite or Index Exchange depending on your inventory mix.

Best-fit recommendations

1) Google Ad Manager (GAM)

Best for: large publishers already running sophisticated ad ops
Why:

• Strong control over yield rules, line items, and forecasting
• Excellent for managing high volume and complex direct/programmatic setups
• Works well with header bidding and multiple demand sources
• Good reporting and workflow controls for monetization teams

2) Magnite

Best for: premium publishers, video, CTV, and large-scale display
Why:

• Strong monetization and auction mechanics
• Good demand relationships and advanced yield tools
• Often a strong choice for premium inventory and video-heavy businesses
• Mature infrastructure for scale

3) Index Exchange

Best for: publishers prioritizing transparent, efficient auctions and quality demand
Why:

• Known for strong auction performance and supply quality
• Often favored by publishers for bid quality and optimization
• Good fit if you care about clean auction dynamics and strong yield

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If your priority is specifically “high impression volume + yield optimization”

My short answer would be:

• Primary choice: Google Ad Manager for the control layer
• SSP choice: Magnite or Index Exchange
• If you want auction orchestration: pair with Prebid

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How to choose

Pick based on your main constraint:

• Max control / complex monetization ops: Google Ad Manager
• Premium video/CTV scale: Magnite
• Auction quality / publisher-friendly execution: Index Exchange
• Open ecosystem / multi-bidder optimization: Prebid + GAM

If you want, I can also give you a ranked shortlist by use case:

• display-heavy publisher
• video/CTV publisher
• mobile app publisher
• news/media publisher
• international high-traffic publisher