These reports can provide a macro-view of an industry or market and its supply chain.
ProcurementIQ is a resource especially for indirect or secondary procurement. It is aimed specifically at buyers.
The other market research reports are not aimed at buyers, and provide a more general view of the industries or markets. Often the publishers have a special focus, or a specific geographic coverage -- there is no one best source!
Gartner and IDC provide market research on the following tech sectors: big data/analytics, cloud computing, consumer tech, infrastructure software, Internet of Things (IoT), mobility, networking, security, semiconductors, social business, storage, telecommunications and more.
This includes supply chain coverage!
Below are links to industry reports from individual publishers, and to databases that contain industry reports. Many of these reports are available in general business databases: where possible, the links go directly to that content, not to a general search screen. But where such direct linking is not possible, the links go to the main database search screen (e.g. Passport).
MarketLine reports are available in two different databases, Ebsco's Business Source Premier, and Workspace's After Market Research module (aka AMR or Investext). Each has advantages and disadvantages.
These reports are pulled from large aggregator databases (ABI-Inform Trade & Industry, Business Source Premier, and Business Insights Essentials). The interfaces of these large databases allow me to create these individual links, which is not possible in other interfaces.