Key Takeaways Roblox has partnered with PubMatic to allow for media purchases of Roblox's video ad inventory when it is available later this year. Roblox, which began testing out its video ad platform in November, said that teaming with PubMatic will give more advertisers the ability to reach its users. Roblox shares were up 1.5% in late-afternoon trading, bucking a broader downturn for U.S. equities. Roblox (RBLX) shares were higher Wednesday afternoon, bucking a broader downturn for U.S. equities, after t ...