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Nextdoor Holdings, Inc. operates a neighborhood network that connects neighbors, businesses, and public services in the United States and internationally. The company enables neighbors and organizations to get information, give and get help, and build connections. It also offers advertising solutions, designs to generate value for businesses for connection and sales expansion. The company is headquartered in San Francisco, California.

Magnite, Inc., together with its subsidiaries, operates an independent omni-channel sell-side advertising platform in the United States and internationally. The company's platform offers applications and services for sellers of digital advertising inventory or publishers that own and operate CTV channels, applications, websites, and other digital media properties to manage and monetize their inventory; and applications and services for buyers, including advertisers, agencies, agency trading desks, and demand side platforms to buy digital advertising inventory, as well as an independent marketplace that connects buyers and sellers. It markets its solutions through sales teams that operate from various locations. The company was formerly known as The Rubicon Project, Inc. and changed name to Magnite, Inc. in July 2020. Magnite, Inc. was incorporated in 2007 and is headquartered in New York, New York.

Momentive Global, Inc. engages in providing Software-as-a-Service solutions that help businesses collect and analyze stakeholder sentiment at scale. It operates through the United States, Canada, Ireland, Netherland, and Rest of World geographical segments. The company was founded by Ryan Finley in 1999 and is headquartered in San Mateo, CA.

PubMatic, Inc., a technology company, engages in the provision of a cloud infrastructure platform that enables real-time programmatic advertising transactions for digital content creators, advertisers, agencies, agency trading desks, and demand side platforms worldwide. Its PubMatic SSP, a sell-side platform, used for the purchase and sale of digital advertising inventory for publishers and buyers. The company also provides solutions, including OpenWrap, a header bidding solution; Openwrap OTT, a prebid-powered unified bidding solution; Openwrap SDK, an enterprise-grade management tools and analytics; Connect, a solution that provides additional data and insights to publishers and buyers; Activate, which allows buyers to execute direct deals on its platform across publisher inventory; Convert, a commerce media solution; and Identity Hub, an ID management tool for publishers that leverages specialized technology?infrastructure?to simplify the complex alternative identifier marketplace. Its platform supports an array of ad formats and digital device types, including mobile app, mobile web, desktop, display, video, over-the-top (OTT), connected television, and media. The company was incorporated in 2006 and is based in Redwood City, California.