MadTech Daily: IAB Forecasts 9.5% US Ad Spend Growth; OpenAI Eyes $40bn Funding; Nine Sells 2GB & 3AW to Arthur Laundy

On today’s MadTech Daily, we cover the IAB forecasting 9.5% US ad spend growth in 2026 driven by digital and agentic AI, OpenAI eyeing USD$40bn (£29.6bn) in funding from Nvidia, Amazon, and Microsoft, as well as  Nine selling 2GB and 3AW to Arthur Laundy.